ZR1 Exhaust Question...What's factory?
09-20-2002, 01:06 PM
#1
Le Mans Master
Thread Starter
ZR1 Exhaust Question...What's factory?
How is the factory exhaust setup on a ZR1? I'm hopefully going to get one in the near future and I would like to make a good exhaust for it, so I'd just like to start getting ideas on what to do. Is it basically the same as the LT1? (Dual 2½", resonator, then mufflers) Also, would it be good to go with dual 2.75" with a Dynomax Ultra Flow Dual In/Out in place of the resonator, then no mufflers just tips? Thanks guys!
09-20-2002, 03:20 PM
#2
Burning Brakes
Re: ZR1 Exhaust Question...What's factory? (TIMSPEED)
Timspeed:
It depends on what you want to do with the car.. This is an exhausting topic(ha ha) that has been discussed over and over again. In my opinion, if you want the best combination of power gain and sound, get the Flowmaster system. The only problem is the mild steel construction(it will eventually rust). If you want something that looks pretty but does little for performance while adding an 'interesting' exhaust note, go Corsa.
If you don't care about noise, heck with it, I want the *most* power even at the expense of my hearing, go with the 3" Tri-Flo system with the restrictors cut out of the exhaust tips and an x-pipe. Actually, I was pleasantly surprised; I just installed my 3" x-pipe yesterday and I find the exhaust louder but not too intrusive. This was a 5 mile drive with the windows down. Resonance is definitely more than before around 2K RPMS. I can see it being pretty bad buttoned up on the road with the A/C on.
Seat of the pants tells me the car picked up some *serious* midrange power. I feel comfortable saying I gained what others(LT5PWR, etc) saw on the dyno. 3-5K feels much stronger than before, probably due to the added torque. And the sound, oh the fantastic sound(other than the resonance).
It sounds just like the old Tri-Flos I remember from the Gatherings 3-5 years ago; you can hear each cylinder fire deep into the exhaust(not a very good way to explain it) pipes, almost sounds like the car has a set of cams in it(I wish it did;)) I got two thumbs up on the sound in that 5 mile drive! Let me know when you are ready to make a decision on the exhaust, I'm a Tri-Flo distributor.
It depends on what you want to do with the car.. This is an exhausting topic(ha ha) that has been discussed over and over again. In my opinion, if you want the best combination of power gain and sound, get the Flowmaster system. The only problem is the mild steel construction(it will eventually rust). If you want something that looks pretty but does little for performance while adding an 'interesting' exhaust note, go Corsa.
If you don't care about noise, heck with it, I want the *most* power even at the expense of my hearing, go with the 3" Tri-Flo system with the restrictors cut out of the exhaust tips and an x-pipe. Actually, I was pleasantly surprised; I just installed my 3" x-pipe yesterday and I find the exhaust louder but not too intrusive. This was a 5 mile drive with the windows down. Resonance is definitely more than before around 2K RPMS. I can see it being pretty bad buttoned up on the road with the A/C on.
Seat of the pants tells me the car picked up some *serious* midrange power. I feel comfortable saying I gained what others(LT5PWR, etc) saw on the dyno. 3-5K feels much stronger than before, probably due to the added torque. And the sound, oh the fantastic sound(other than the resonance).
It sounds just like the old Tri-Flos I remember from the Gatherings 3-5 years ago; you can hear each cylinder fire deep into the exhaust(not a very good way to explain it) pipes, almost sounds like the car has a set of cams in it(I wish it did;)) I got two thumbs up on the sound in that 5 mile drive! Let me know when you are ready to make a decision on the exhaust, I'm a Tri-Flo distributor.
09-20-2002, 05:01 PM
#3
Le Mans Master
Thread Starter
Re: ZR1 Exhaust Question...What's factory? (ZR WON)
Well, I know for a fact that I want to make custom and not go with Flowmaster, B&B, Corsa, Tri-Flow's, P.E.'s, or anything like that. I want the loudest and meanest exhaust possible. So you say dual 3"? instead of 2.75"? My friend has a nice 440 in his 68 Coronet with dual 3" pipes and he said that 3" is ALOT of pipe for a small block. Hmm..I'll try different combo's. I recently found a friend who has a small lift and can weld, so...I can try different exhaust setups. :cheers:
BTW: What ALL have you done to your Z to get it to run in the 118mph zone?
BTW: What ALL have you done to your Z to get it to run in the 118mph zone?
09-20-2002, 08:10 PM
#4
Burning Brakes
Re: ZR1 Exhaust Question...What's factory? (TIMSPEED)
Tim:
You will be hard pressed to gain any hp over a 3" Tri-Flo with x-pipe and restrictors removed from the mufflers, period.. It's mean.... Damned mean.. FWIW....
To get it to run 118? Shoot, it'll trap higher than that...;) Seriously, simple bolt on mods, the long block hasn't been touched. Headers, intake work, gears. That's it.
[Modified by ZR WON, 6:13 PM 9/20/2002]
You will be hard pressed to gain any hp over a 3" Tri-Flo with x-pipe and restrictors removed from the mufflers, period.. It's mean.... Damned mean.. FWIW....
To get it to run 118? Shoot, it'll trap higher than that...;) Seriously, simple bolt on mods, the long block hasn't been touched. Headers, intake work, gears. That's it.
[Modified by ZR WON, 6:13 PM 9/20/2002]
09-20-2002, 08:28 PM
#5
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Re: ZR1 Exhaust Question...What's factory? (TIMSPEED)
118 is a BIT too high for a stock z, without head work.
if you want to get LOWWWWD, then get bullet mufflers, gut the cats or remove them, get an x pipe and some 2.5 in pipe. it will be loud all right. however, dont expect to put your foot on the pedal if there are any black and whites around. also, be prepared for lots of vibration, or resonance. very annoying. also, you will lose a lot of low end as you do need some back pressure to get that low end.
i can tell you from experience, my '91 has headers and a stock exhaust, no cats, and i know a lost a lot of low end, but it pulls harder after oh, about 2500. the '92 has stock headers and borla exhaust and it pulls excellent all over the range. the '91 is much quieter, even though it has a lot of top end work. i love the sound of the borlas, but once the '91 winds up, its downright AWESUMMMMM.
take care
if you want to get LOWWWWD, then get bullet mufflers, gut the cats or remove them, get an x pipe and some 2.5 in pipe. it will be loud all right. however, dont expect to put your foot on the pedal if there are any black and whites around. also, be prepared for lots of vibration, or resonance. very annoying. also, you will lose a lot of low end as you do need some back pressure to get that low end.
i can tell you from experience, my '91 has headers and a stock exhaust, no cats, and i know a lost a lot of low end, but it pulls harder after oh, about 2500. the '92 has stock headers and borla exhaust and it pulls excellent all over the range. the '91 is much quieter, even though it has a lot of top end work. i love the sound of the borlas, but once the '91 winds up, its downright AWESUMMMMM.
take care
09-20-2002, 10:34 PM
#6
Drifting
Re: ZR1 Exhaust Question...What's factory? (TIMSPEED)
If your looking to make power I would contact 8388 on the forum his 93 zr dynoed 380 something with only a drm chip /kn/ with a desert developement 3inch exhaust ...it was impressive :cool:
09-20-2002, 11:23 PM
#7
Burning Brakes
Re: ZR1 Exhaust Question...What's factory? (ZR1Rob)
ZR1 Rob:
Trust me, nothing else has been done to my car, no head work at all.. It trapped at 117 and change in serious heat/humidity. Several on this board saw the numbers at the track. Don't knock strong factory LT5s.... I have a 'mediocre' one... I bet 8388s would trap at close to 120 with just an exhaust and chip mod!!!!
[Modified by ZR WON, 9:25 PM 9/20/2002]
Trust me, nothing else has been done to my car, no head work at all.. It trapped at 117 and change in serious heat/humidity. Several on this board saw the numbers at the track. Don't knock strong factory LT5s.... I have a 'mediocre' one... I bet 8388s would trap at close to 120 with just an exhaust and chip mod!!!!
[Modified by ZR WON, 9:25 PM 9/20/2002]
09-21-2002, 01:46 AM
#8
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Re: ZR1 Exhaust Question...What's factory? (ZR WON)
ok brian, you got the headers and you da man!
however, most "stock" 375 motors do put around 320 at the rear wheels. that's what my '92 dynoed at battle mt, nevada for the pony express open rr a couple of years ago. although that place is about 5000 feet (i think), it wont get much more than that at sea level. if you drop that 15% off for driveline loss from the 375 engine, you get almost exactly 320 at the rear, just what was advertised. to get 380 at the rear wheels means you have 437 at the crank. for a 375 motor, i dont think you'll get that just by getting lucky with the production line assembler to hit the timing on all four cams just right, its possible, just not probable in my opinion. maybe with a 405 motor, but not the 375. and not by adding an exhaust and a chip, again in my opinion. i think the best you can get from an exhaust is about 10 hp at the rear, another 10 for a chip.
however, most "stock" 375 motors do put around 320 at the rear wheels. that's what my '92 dynoed at battle mt, nevada for the pony express open rr a couple of years ago. although that place is about 5000 feet (i think), it wont get much more than that at sea level. if you drop that 15% off for driveline loss from the 375 engine, you get almost exactly 320 at the rear, just what was advertised. to get 380 at the rear wheels means you have 437 at the crank. for a 375 motor, i dont think you'll get that just by getting lucky with the production line assembler to hit the timing on all four cams just right, its possible, just not probable in my opinion. maybe with a 405 motor, but not the 375. and not by adding an exhaust and a chip, again in my opinion. i think the best you can get from an exhaust is about 10 hp at the rear, another 10 for a chip.
09-21-2002, 02:39 AM
#9
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Re: ZR1 Exhaust Question...What's factory? (TIMSPEED)
[QUOTE]How is the factory exhaust setup on a ZR1? I'm hopefully going to get one in the near future QUOTE]
Damn... 944, bike, IS300, and a Zr1? You either have a big butt garage or lofty aspirations...
I've been thinking about a ZR1 over the past few years, but never ended up with one when it came time to buy another car. Eventually they will drop in price (and unfortunately quality) to the point I can pick one up to romp on.
They do have a nice Z06 out at the Mazda dealer on McHenry. You should take it for a spin.
-Matt
Damn... 944, bike, IS300, and a Zr1? You either have a big butt garage or lofty aspirations...
I've been thinking about a ZR1 over the past few years, but never ended up with one when it came time to buy another car. Eventually they will drop in price (and unfortunately quality) to the point I can pick one up to romp on.
They do have a nice Z06 out at the Mazda dealer on McHenry. You should take it for a spin.
-Matt
09-25-2002, 01:50 AM
#10
Drifting
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Re: ZR1 Exhaust Question...What's factory? (ZR1Rob)
ok brian, you got the headers and you da man!
however, most "stock" 375 motors do put around 320 at the rear wheels. that's what my '92 dynoed at battle mt, nevada for the pony express open rr a couple of years ago. although that place is about 5000 feet (i think), it wont get much more than that at sea level. if you drop that 15% off for driveline loss from the 375 engine, you get almost exactly 320 at the rear, just what was advertised. to get 380 at the rear wheels means you have 437 at the crank. for a 375 motor, i dont think you'll get that just by getting lucky with the production line assembler to hit the timing on all four cams just right, its possible, just not probable in my opinion. maybe with a 405 motor, but not the 375. and not by adding an exhaust and a chip, again in my opinion. i think the best you can get from an exhaust is about 10 hp at the rear, another 10 for a chip.
however, most "stock" 375 motors do put around 320 at the rear wheels. that's what my '92 dynoed at battle mt, nevada for the pony express open rr a couple of years ago. although that place is about 5000 feet (i think), it wont get much more than that at sea level. if you drop that 15% off for driveline loss from the 375 engine, you get almost exactly 320 at the rear, just what was advertised. to get 380 at the rear wheels means you have 437 at the crank. for a 375 motor, i dont think you'll get that just by getting lucky with the production line assembler to hit the timing on all four cams just right, its possible, just not probable in my opinion. maybe with a 405 motor, but not the 375. and not by adding an exhaust and a chip, again in my opinion. i think the best you can get from an exhaust is about 10 hp at the rear, another 10 for a chip.
Mine Dynoed at 337 RWH and 338 RWT. This was on a Dynojet and SAE Corrected.
The "stocker" also trapped at 113 on a nice cool day. ;)
[Modified by ZR_Don, 5:47 PM 9/25/2002]
09-25-2002, 10:49 AM
#11
Safety Car
Re: ZR1 Exhaust Question...What's factory? (White 68)
If your looking to make power I would contact 8388 on the forum his 93 zr dynoed 380 something with only a drm chip /kn/ with a desert developement 3inch exhaust ...it was impressive :cool:
09-25-2002, 11:44 AM
#12
Burning Brakes
Re: ZR1 Exhaust Question...What's factory? (ZR1Rob)
ZR1 Rob:
Not sure what to make of your "You got the headers and you da man" statement, so I'll just ignore it.:)
As I said, I have a 'mediocre' stock LT5. It pulled 332rwhp(SAE) completely stock down to the 10 year old 18K mile air filter. There are early 90 ZR-1s that pull close to 350rwhp stock(very early cars, GM wanted them to turn the advertised number for sure).
Also, you can get much more than 10rwhp(from exhaust) on a car with minimal mods. You said that you can only expect 10hp from an exhaust. On a stock car I agree with you completely. On a car with slight mods, like headers and ported plenum/injector housings, you can get over 10rwhp just by installing a 3" x-pipe on the B&B Tri-Flo exhaust . As an example, I gained 7rwhp by switching from 2.5" FLowmasters to 3" Tri-Flos on my car; I expect even more with the x-pipe in place of the resonator.
The thing you need to remember is an LT5 needs a *Lot* of air; once you started getting more air in, naturally you need to get it out. That's when headers and exhaust *really* start to make a significant difference in power output.
Lastly, I guess I'm not sure why you are arguing with me on whether or not my engine has head work; I believe I would know if it did.:) My car traps 118 with *no* head work and I fully expect to be close to 120 with the new x-pipe installed. Sorry that's impossible to you but that's a fact!:)
[Modified by ZR WON, 9:47 AM 9/25/2002]
[Modified by ZR WON, 10:47 AM 9/25/2002]
[Modified by ZR WON, 10:56 AM 9/25/2002]
Not sure what to make of your "You got the headers and you da man" statement, so I'll just ignore it.:)
As I said, I have a 'mediocre' stock LT5. It pulled 332rwhp(SAE) completely stock down to the 10 year old 18K mile air filter. There are early 90 ZR-1s that pull close to 350rwhp stock(very early cars, GM wanted them to turn the advertised number for sure).
Also, you can get much more than 10rwhp(from exhaust) on a car with minimal mods. You said that you can only expect 10hp from an exhaust. On a stock car I agree with you completely. On a car with slight mods, like headers and ported plenum/injector housings, you can get over 10rwhp just by installing a 3" x-pipe on the B&B Tri-Flo exhaust . As an example, I gained 7rwhp by switching from 2.5" FLowmasters to 3" Tri-Flos on my car; I expect even more with the x-pipe in place of the resonator.
The thing you need to remember is an LT5 needs a *Lot* of air; once you started getting more air in, naturally you need to get it out. That's when headers and exhaust *really* start to make a significant difference in power output.
Lastly, I guess I'm not sure why you are arguing with me on whether or not my engine has head work; I believe I would know if it did.:) My car traps 118 with *no* head work and I fully expect to be close to 120 with the new x-pipe installed. Sorry that's impossible to you but that's a fact!:)
[Modified by ZR WON, 9:47 AM 9/25/2002]
[Modified by ZR WON, 10:47 AM 9/25/2002]
[Modified by ZR WON, 10:56 AM 9/25/2002]
09-25-2002, 12:05 PM
#13
Burning Brakes
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Re: ZR1 Exhaust Question...What's factory? (ZR WON)
Guys, brian Numbers are right for his mods... Let me give you guys some info.
Somepeople port the intake in the back yard, or have a friend do it for them, or extrude hone the intake and heads.
Let me tell you that All porting Jobs Are NOT created equal, and here is wher the misconception comes.
I for example had heads and intake ported.. I thought I had the MEGA port work... unitl I dynoed at 380 rwhp.. Heck I thought the dyno was wrong.. could not believe it.. trapped at 118 mph .. I could not understand it , auntil I didi my other motor and sent the porting work out to Greg. Vantdeventer.
Now whe I got my parts back I was like :eek:
This is what a porting job looks like.. now I understand :yesnod:
Somepeople port the intake in the back yard, or have a friend do it for them, or extrude hone the intake and heads.
Let me tell you that All porting Jobs Are NOT created equal, and here is wher the misconception comes.
I for example had heads and intake ported.. I thought I had the MEGA port work... unitl I dynoed at 380 rwhp.. Heck I thought the dyno was wrong.. could not believe it.. trapped at 118 mph .. I could not understand it , auntil I didi my other motor and sent the porting work out to Greg. Vantdeventer.
Now whe I got my parts back I was like :eek:
This is what a porting job looks like.. now I understand :yesnod:
09-25-2002, 12:11 PM
#14
Team Owner
Re: ZR1 Exhaust Question...What's factory? (RatRacer)
[QUOTE]If your looking to make power I would contact 8388 on the forum his 93 zr dynoed 380 something with only a drm chip /kn/ with a desert developement 3inch exhaust ...it was impressive :cool:
That's because Sam's car is a freak!
Freak is good :yesnod: :D
That's because Sam's car is a freak!
Freak is good :yesnod: :D
09-25-2002, 12:45 PM
#15
Melting Slicks
Re: ZR1 Exhaust Question...What's factory? (RatRacer)
I agree...................oh, I thought you called Sam a freak. Yeah his car is a freak as well. :D
09-25-2002, 01:06 PM
#16
Team Owner
Re: ZR1 Exhaust Question...What's factory? (4cefed)
[QUOTE]I agree...................oh, I thought you called Sam a freak. Yeah his car is a freak as well. :D
:cry :p:
:cry :p:
09-25-2002, 01:18 PM
#17
Re: ZR1 Exhaust Question...What's factory? (ZR WON)
Some of my old zr-1 dyno #s:
1990 #2855 48000 miles, Flowmaster exhaust, Z-industrys chip, 346rwhp, 339 rwtq
1990 #2874 30000 miles, B&B exhaust, DRM chip, 339 rwhp, 339 rwtq
My 92 ZR-1 #293 40000 miles, Borla exhaust, Marc R. chip, ported top end
366 rwhp, 350 rwtq. I have since added headers and h-pipe. It is very strong now 380-400rwhp, feels to be closer to 400, will dyno at next gathering.
:cheers:
1990 #2855 48000 miles, Flowmaster exhaust, Z-industrys chip, 346rwhp, 339 rwtq
1990 #2874 30000 miles, B&B exhaust, DRM chip, 339 rwhp, 339 rwtq
My 92 ZR-1 #293 40000 miles, Borla exhaust, Marc R. chip, ported top end
366 rwhp, 350 rwtq. I have since added headers and h-pipe. It is very strong now 380-400rwhp, feels to be closer to 400, will dyno at next gathering.
:cheers:
09-25-2002, 02:09 PM
#18
Melting Slicks
Re: ZR1 Exhaust Question...What's factory? (92 ZR1)
Some of my old zr-1 dyno #s:
1990 #2855 48000 miles, Flowmaster exhaust, Z-industrys chip, 346rwhp, 339 rwtq
1990 #2874 30000 miles, B&B exhaust, DRM chip, 339 rwhp, 339 rwtq
1990 #2855 48000 miles, Flowmaster exhaust, Z-industrys chip, 346rwhp, 339 rwtq
1990 #2874 30000 miles, B&B exhaust, DRM chip, 339 rwhp, 339 rwtq
09-26-2002, 12:44 AM
#19
Drifting
Re: ZR1 Exhaust Question...What's factory? (4cefed)
My 91 with just Power effects exaust, DRM chip, and Vortex rammer has trapped as high as 115mph so I don't think 118mph is hard to believe from a car with more mods.
