Z06 Modifications vs. Horsepower
I'm compiling a list of C5 and Z06 Dyno modifications. I hope this saves
someone time and money. Half the stuff I get turns out to be crap. If you would like to contribute, have questions or have other modification and/or vendor information, please email feedback. The modifications listed were performed on a 2000 Coupe, 2001 Z06 and 2003 Z06. Some things that worked on the C5 don't work as well on the Z06's. All HP ratings are RWHP in cronolgical order. I'm experimenting with LS1 Edit. Does anyone have tables and/or dyno numbers? Does anyone have dyno info on Aftermarket Heads? 2000 C5 - 307 HP stock, 22,000 miles, July 2001 K&N Filter in stock box +4 HP, Z06 Airbox +3 HP Throttle body coolant by-pass tube 0 HP Remove MAF screen -1 Hp @ 2800 RPM, +2 @ 5900 RPM IAT relocation +2 HP @ 2800 RPM, -1 HP @ 5700 RPM (knock detect) Random Technology Cats +6 HP, +2 HP @ 2900 RPM Flowmaster mufflers +5 HP JBA headers +4 HP Modified 322 Peak RWHP @ 5400 RPM 2001 Z06 - 334 HP @ 5700 RPM stock, 7150 miles, Aug 2003 K&N Filter +6 HP, cut Z06 Airbox opening -1 HP @ 2400, +1 @ 5900 RPM WCC Airbridge -2 HP @ 3000 RPM, +4 HP @ 5800 RPM Ported throttle body +3 HP Port matched exhaust manifolds, no pup-cats, new Random cats, Xpipe +14 Modified 358 RWHP @ 5900 RPM 2003 Z06 - 356 HP @ 5800 RPM stock, 2000 miles, April 2003 K&N filter +3 HP, Removed and installed Blackwing +6 HP @ 4200 RPM WCC Airbridge +2 HP 3300 RPM, +4 HP 6200 RPM BBK Throttle Body +5 HP @ 6100 RPM Hypertech 180 thermostat -3 HP, @ 200 F. 8 degrees hotter than stock 192 F. Hypertech 160 thermostat +2 HP, @ 178 F. 14 degrees cooler JBA headers -4 HP @ 3400 RPM, -7 HP @ 6000 RPM SLP headers hit passenger side frame, no dyno test B&B Z06 headers +3 HP @3700 RPM, +6 HP @ 5700RPM Random 3" Cats, 3" tubing, Hedman 3" X-Pipe +8 @ 4600 RPM, +5 @ 6100 GM HD Plug wires +1 HP Crane 1.8 Roller Rockers +8 HP Predator Programmer -3 HP @ 3200 RPM, -9 HP @ 6200 RPM Modifed RWHP 388 @ 6000 RPM (Temp, Knock, Spark and Fuel were monitored using AutoTap GM Extended Software. I will be testing TPIS, LPE and Stainless Works full length headers on the 2003 Z06) Parts Winners Shifters: Kirban vs. B&M = B&M Headlamps: MidAmerica HiIntensity Blue vs. WCC Hyperwhite = Hyperwhite Speakers: MB Quart vs. Infinity Kappa = Infinity Shocks: Stock 2003 Z06 vs. Edelbrock IAS = Edelbrock Best Mods Baer Eradispeed Rotors Fichtner Chevrolet CD Changer Bel Remote detector with hidden Controls where the ashtray goes Fosgate amp under seat using factory Bose deck/woofers/wiring Vendors that Rock: Mid America Corvettes Eckler's Jeg's Exit28Motorsports RockAuto GM Parts West Coast Corvette (WCC) Martel Brothers LMPerformance Vendors to Avoid: GMPartsDirect RPM Outlet [Modified by ACELRNT, 10:55 PM 5/15/2003] |
Re: Z06 Modifications vs. Horsepower (ACELRNT)
:D
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Re: Z06 Modifications vs. Horsepower (ACELRNT)
:rolleyes: Please add "This is of course just my opinion" to your post. I have lots of disagreements with your post, but I will just name one. T Byrne Motorsports has been an excellent vendor for me.
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Re: Z06 Modifications vs. Horsepower (racer44)
You are right. My bad. It is just my opinion. I ordered several items from the guys you mentioned. Everything was great, fast ship, good prices... until the one time I needed customer service on a defective item and got into a great big hassle.
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Re: Z06 Modifications vs. Horsepower (ACELRNT)
I weighed my 03Z with 119 miles and it came in at 3140lbs with a FULL tank of gas...I know J-rod weighed his 02Z...(not sure of the mileage) with a FULL tank and it came in at 3150lbs
A little something to add to your data base BTW, my weighing machine had a +/- degree of 30lbs ( meaning the car could've have actually been 30 pounds lighter or heavier) Good luck ! :) David In Indy |
Re: Z06 Modifications vs. Horsepower (ACELRNT)
With respect to the Crane roller rockers on the Z06; what was the rocker ratio?
Also, do you have any information on the Granatelli or other MAF for the Z06? By the way, great project, I wish I could contribute more!! :D Thanks, Mike |
Re: Z06 Modifications vs. Horsepower (mayodoc)
On my car, removing the airbox cover and replacing it with two wire ties neeted me a 15.8HP gain and aaproximately 11.2 lb/Ft tq...
Before 356 After 372 |
Re: Z06 Modifications vs. Horsepower (mayodoc)
Crane 1.8 Ratio Roller Rockers. The HP gain was noticeable, but the best part is the crisp throttle response from 3500 to 5500 RPM. I've seen 1.85 rockers, but the springs would need to be changed to prevent coil bind. .040 clearance hot is the minimum recommended coil clearance at full valve lift. My 2003 Z06 was .055 - .065 inches. I also used Titanium clips and retainers.
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Re: Z06 Modifications vs. Horsepower (mayodoc)
The 2003 Z06 MAF really rocks! They come screenless from the factory, are calibrated for the screenless airflow and have the IAT sensor built in. Any MAF changes made will eventually be negated by O2 driven fuel trim tables. The GM mechanic that I take my cars to reasoned that he would rather spend the money on EFILive5 Pro and change the fuel trim and spark tables on his 2002 Z06.
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Re: Z06 Modifications vs. Horsepower (J-Rod)
Were you using the stock filter?
Are you using the stock air-bridge? What year and how many miles? 15.8 HP is AMAZING. |
Re: Z06 Modifications vs. Horsepower (ACELRNT)
How is it possible on the 03 Z06 that it loses horse power with headers, also on the same 03 Z06, it loses horse power after using the pred tuning. :confused: :confused: :confused:
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Re: Z06 Modifications vs. Horsepower (Vegasr)
How is it possible on the 03 Z06 that it loses horse power with headers, also on the same 03 Z06, it loses horse power after using the pred tuning. :confused: :confused: :confused: The Predator caused the engine to run real rough. The data logging showed knock detection was limiting the spark advance and WOT operation was enabling COT (converter over temp). Rather than dick with it, I bailed. If it's not good out of the box, it's better off staying in the box. I tried it because RPM Outlet had a 30 day money back guarantee. I sent it back two days after I received it. The problem is they wouldn't honor the guarantee, saying it was a typo. RPM Outlet ended up charging me a 30% restock fee of $125.30. One of the worst vendors I've dealt with. What a f***in' nightmare. :rant: :mad :nopity |
Re: Z06 Modifications vs. Horsepower (ACELRNT)
The Z06 exhaust manifolds are not "tyi-wye", but they are more efficient than fabricated shorty headers because the exhaust passages are smoother and constant cross section. With fabricated shorties the bends lose cross section area, and the welded joints can have weld splatter and other discontinuities in the flow path. That's why GM went back to CI manifolds from the fabricated stainless steel manifolds on C4s.
Even long tube headers don't do much with the OEM cams because they have very little overlap. Sometimes it's hard to beat the OEM stuff at any price. Duke |
Re: Z06 Modifications vs. Horsepower (SWCDuke)
The Z06 exhaust manifolds are not "tyi-wye", but they are more efficient than fabricated shorty headers because the exhaust passages are smoother and constant cross section. With fabricated shorties the bends lose cross section area, and the welded joints can have weld splatter and other discontinuities in the flow path. That's why GM went back to CI manifolds from the fabricated stainless steel manifolds on C4s. Even long tube headers don't do much with the OEM cams because they have very little overlap. Sometimes it's hard to beat the OEM stuff at any price. Duke The 2003 Z06 cast iron manifolds are 4 into 2 into 1. If you look inside the drivers side bank, there is a divider between the 1-3 runners and the 5-7 runners. 1 and 3 merge together before they merge with 5 and 7. The same is true for the passenger side. On my 2001 Z06, they all merge simultaneously. When I spoke to B&B about the FCOR-0257 Z06 Tri-Y headers, they explained they were made in similar fashion to the stock units. The previous B&B offerings are not Tri-Y. |
Re: Z06 Modifications vs. Horsepower (ACELRNT)
:flag So then I take it long tube headers will give a little boost in HP's over the stock setup. Is the gain even worth the money? :confused:
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Re: Z06 Modifications vs. Horsepower (Vegasr)
:flag So then I take it long tube headers will give a little boost in HP's over the stock setup. Is the gain even worth the money? :confused: |
Re: Z06 Modifications vs. Horsepower (Vegasr)
:flag So then I take it long tube headers will give a little boost in HP's over the stock setup. Is the gain even worth the money? :confused: |
Re: Z06 Modifications vs. Horsepower (ACELRNT)
The 2003 Z06 cast iron manifolds are 4 into 2 into 1. If you look inside the drivers side bank, there is a divider between the 1-3 runners and the 5-7 runners. 1 and 3 merge together before they merge with 5 and 7. The same is true for the passenger side. On my 2001 Z06, they all merge simultaneously. When I spoke to B&B about the FCOR-0257 Z06 Tri-Y headers, they explained they were made in similar fashion to the stock units. The previous B&B offerings are not Tri-Y. On a conventional automotive V-8 with a cruciform crankshaft, two cylinders on each bank fire at 90 degree intervals. If the exhaust exits into a conventional "log" manifold there will be interference on the lead cylinder of this sequence because the trailing cylinder will blow down as the lead cylinder completes the exhaust stroke. The Z06 manifolds are designed to mitigate this interference, so they might be properly called a "branched manifold" as opposed to a "log manifold", but they are not equivalent to a conventional tri-wye header. Notwithstanding the above, the '02-'03 Z06 manifolds perform very well and only a well designed set of long tube headers is likely to outperform them. Though most headers on the market are four-into-one, tri-wye headers are better for street engines because they produce favorable wave dynamics over a broader rev band, but they are more expensive to manufacture and most header customers want them to look like "race headers", which are normally four-into-one because racing engines only need to capture wave dynamics over a fairly narrow rev band. If you look at the exhaust manifold on older four cylinder engines, they often have two isolated outlets, which group 1-4 and 2-3 into separate down pipes that merge to a single pipe two to three feet beyond the manifold. This type of system functions as a true tri-wye header. Mercedes V-8s from seventies also have branched manifolds with two isolated outlets and long down pipes that function as tri-wye headers. Unfortunately, most of these systems have been replaced by conventional manifolds in order to get the converters and O2 sensors closer to the exhaust source for quicker lightoff, since quick warmup is critical to passing current emission certification standards. Though the current Z06 manifolds can be (loosely) considered to be branched, they merge into a single outlet, which precludes the use of two isolated downpipes to obtain a true "header" effect by taking advantage of wave dynamics to aid exhaust scavenging. Duke [Modified by SWCDuke, 11:30 AM 5/11/2003] |
Re: Z06 Modifications vs. Horsepower (SWCDuke)
I like your "branched manifold" description. I also think this better describes the B&B 'headers'. The Tri-Y descriptor is better left to a design like the Belangers. I was using and repeating loose descriptive terminology instead of scientific. Now if we could only get B&B to change their Tri-Y advertising...
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