Go Back   Corvette Forum > C4 Corvettes, 1984 - 1996 > C4 Tech/Performance
Sign in using an external account
Register Forgot Password?
Register Albums Search Today's Posts Mark Forums Read FAQ
Search
C4 Tech/Performance
L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine Sponsored by
J&D Corvette

Welcome to Corvetteforum.com!
Welcome to Corvetteforum.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join Corvetteforum.com today!


Corvette Store
 
 
C6 Parts & Accessories
C5 Parts & Accessories
Wheels & Tires
Sponsored Ads
 
 
Vendor Directory
  
Reply
 
 
 
 
Thread Tools Search this Thread
Old 03-10-2009, 12:04 AM   #1
motodog
CF Senior Member
 
motodog's Avatar
 
Member Since: Feb 2009
Location: Riverside CA
Default modified lt1 intake for l98

has anyone installed a lt1 intake on there l98? what gains did they get? and is there a differance on the lt4 intake ?
motodog is offline   Reply With Quote
Old 03-10-2009, 10:36 AM   #2
RandyJ75
CF Senior Member
St. Jude Donor '06-'07
 
RandyJ75's Avatar
 
Member Since: Jan 2006
Location: Mt Laurel NJ
Default

Quote:
Originally Posted by motodog View Post
has anyone installed a lt1 intake on there l98? what gains did they get? and is there a differance on the lt4 intake ?
I don't think an LT4 intake will fit on a L98 head, as the LT4's have raised runners. Do a search on this, you'll find that the engine will pull to about 5500 rpm, but that you will need a reprogrammed chip to make it work.
RandyJ75 is offline   Reply With Quote
Old 03-10-2009, 11:20 AM   #3
redrose
CF Senior Member
 
Member Since: Feb 2006
Location: backwoods upstate ny
Default

Quote:
Originally Posted by RandyJ75 View Post
you'll find that the engine will pull to about 5500 rpm, but that you will need a reprogrammed chip to make it work.
nope.

having actually DONE several lt1 intake conversions (including my vette) and talked with at least a half dozen others who have DONE the swap, a stock L98 chip runs just fine with the lt1 24 lb stock injectors, pulls hard till the lifters pump up (6000+ rpm for most)...car runs like it got A-rods breakfast goodies.
redrose is offline   Reply With Quote
Old 03-10-2009, 11:41 AM   #4
gixxr
CF Senior Member
 
Member Since: Mar 2006
Default

Quote:
Originally Posted by redrose View Post
nope.

having actually DONE several lt1 intake conversions (including my vette) and talked with at least a half dozen others who have DONE the swap, a stock L98 chip runs just fine with the lt1 24 lb stock injectors, pulls hard till the lifters pump up (6000+ rpm for most)...car runs like it got A-rods breakfast goodies.
Is the swap easy, are there any alterations, whats the hp tq boosted to and how does this mod compare to a stock LT1
gixxr is offline   Reply With Quote
Old 03-10-2009, 12:13 PM   #5
jeffp1167
CF Senior Member
 
jeffp1167's Avatar
 
Member Since: Oct 2008
Location: Yucaipa CA
Default

Quote:
Originally Posted by motodog View Post
has anyone installed a lt1 intake on there l98? what gains did they get? and is there a differance on the lt4 intake ?
from california, I can tell you a gain you will get! a faster emmision failure LOL
jeffp1167 is offline   Reply With Quote
Old 03-10-2009, 12:19 PM   #6
Demonic85
CF Senior Member

 
Demonic85's Avatar
 
Member Since: Feb 2006
Location: sw Ohio
Default

From all the threads i've seen comparing different intakes, the LT1 conversion seems to be the cheapest and best if your looking for an intake that will pull well past 6K rpms. I'm sure there are better intakes but you can get one for around $400 compared to $1000+ for a miniram.
Demonic85 is offline   Reply With Quote
Old 03-10-2009, 12:52 PM   #7
billvh
CF Senior Member
 
billvh's Avatar
 
Member Since: Oct 2006
Location: Franklin indiana
Default

Redrose,

Did you have any sealing problems with the L98 heads? I have heard about port mismatches, etc.
I have a modded intake, and am thinking about installing it, but first I would like to fix a lean exhaust code I am getting (it is actually running rich though) I can't find any vacuum leaks, so after I change my collector gaskets, I may need to replace intake gaskets anyway. I don't want to install the manifold if there is another problem.
__________________
1998 Dark Red convertible, 6 speed, Borla Stingers, LT headers, x-pipe
billvh is offline   Reply With Quote
Old 03-10-2009, 01:11 PM   #8
neat
CF Senior Member
 
Member Since: May 2001
Location: Raleigh, NC
Send a message via AIM to neat Send a message via MSN to neat
Default

While the stock chip will work, the car will run MUCH better and make MUCH more power if you spend the time/money and tune the computer; especially if you are converting a speed density car.

I did the swap, and by the time I was done, I spent more than the mini ram would have cost.

Fuel lines, rails, fittings, hose, clamps, small cap HEI, external coil, external fuel pressure regulator, my time, tweaking things here and there, etc... None of that stuff is free. By the time it was finally on the car, didn't look like ****, tuned, and ready to roll; I had about $1100 in it. The really ****ty thing was that I also had 40+ hours into it.

In the end, I pulled it off and bought a used mini ram for $750.

If you are on a shoestring budget and don't really care what it looks like, the conversion would probably be the way to go; but if you can at all afford it, there are better options.

Last edited by neat; 03-10-2009 at 01:17 PM.
neat is offline   Reply With Quote
Old 03-10-2009, 01:39 PM   #9
Demonic85
CF Senior Member

 
Demonic85's Avatar
 
Member Since: Feb 2006
Location: sw Ohio
Default

What about this...

http://www.lt1intake.com/services.htm
Demonic85 is offline   Reply With Quote
Old 03-10-2009, 01:43 PM   #10
geogolf
CF Senior Member
 
Member Since: Jun 2005
Location: brookville pa.
Default swap

heres a Lt1 on my 90, I am not much into how the motor looks but I do like how it goes to 6K also did 1.6 rr and pcm chip and 24# injs. used stock distr.Click the image to open in full size. Click the image to open in full size. Click the image to open in full size.
geogolf is offline   Reply With Quote
Old 03-10-2009, 03:21 PM   #11
"swamp rat"
CF Senior Member
 
Member Since: Jan 2009
Default

Quote:
Originally Posted by redrose View Post
nope.

having actually DONE several lt1 intake conversions (including my vette) and talked with at least a half dozen others who have DONE the swap, a stock L98 chip runs just fine with the lt1 24 lb stock injectors, pulls hard till the lifters pump up (6000+ rpm for most)...car runs like it got A-rods breakfast goodies.
I have a question !! PM ME I have a L98 !
"swamp rat" is offline   Reply With Quote
Old 03-10-2009, 03:53 PM   #12
redrose
CF Senior Member
 
Member Since: Feb 2006
Location: backwoods upstate ny
Default

Click the image to open in full size.
my pile, topside egr added since this pic.

Is the swap easy, are there any alterations, whats the hp tq boosted to and how does this mod compare to a stock LT1
swap is less hassle than some back/day tunnel rams that we did, beware 'some assembly required'...future total restoration to oem was maintained, no alterations to oem pieces...difficult to compare with stock lt1 as this engine has other mods to its advantage.

Did you have any sealing problems with the L98 heads? I have heard about port mismatches, etc.
no sealing problems, everything lines up IF IF the new cyl head/manifold mounting holes in the lt1 manifold are set from head ports (not from end of manifold casting)...NO welding should be done to the manifold, it will warp and need to be 'refaced'...some alum L98 cyl heads have a raised edge just below the rocker arm cover that will require slight 'trim' of the lt1 manifold to allow the manifold to drop between the heads and compress the intake gaskets...ports on my cyl heads are abt 1/16" smaller top/bottom than the lt1 manifold, but were left 'till next teardown' (still waiting, performance gain not yet needed)
redrose is offline   Reply With Quote
Old 03-10-2009, 03:55 PM   #13
86GoldProject
CF Senior Member
 
Member Since: Feb 2005
Location: Hamilton New Jersey
Default

Quote:
Originally Posted by Demonic85 View Post
as far as I know that guy hasn't been actually doing them for a year or better now, from what I heard he no longer answers e-mails or anything..
86GoldProject is offline   Reply With Quote
Old 03-10-2009, 07:33 PM   #14
DrEvil11417
CF Senior Member
 
DrEvil11417's Avatar
 
Member Since: Jul 2004
Location: Ozone Park NY
Send a message via AIM to DrEvil11417 Send a message via Yahoo to DrEvil11417
Default

i have one off my car if anyone needs it.. john millican converted it
DrEvil11417 is offline   Reply With Quote
Old 03-10-2009, 09:49 PM   #15
pologreen1
CF Senior Member
 
pologreen1's Avatar
 
Member Since: Dec 2007
Default

Quote:
Originally Posted by DrEvil11417 View Post
i have one off my car if anyone needs it.. john millican converted it
which one do you run now?
pologreen1 is offline   Reply With Quote
Old 03-10-2009, 10:29 PM   #16
motodog
CF Senior Member
 
motodog's Avatar
 
Member Since: Feb 2009
Location: Riverside CA
Default

this is my 1st motor build in a car, so i am loaded with stupid questions. i have a 350 4bolt block with a 396ci rotating assy. going with afr 195 the latest ones. my builder will match the cam when a intake is chosen. at first i was going with the tpis mini ram as it fits under hood and will support 500 hp, 500hp is the goal. i was interested in the lt1 or lt4 because i was thinking i would try to pass a CA smog. if not i have a way. the car is an auto but i am heavly looking at the zf6. in fact a forum member is selling one and i am trying to work my books for it rite now. but back to the intake it looks like it may still be the tpis, i havent seen a dyno # for lt1.
motodog is offline   Reply With Quote
Old 03-11-2009, 12:29 AM   #17
Rogue1
CF Member
 
Rogue1's Avatar
 
Member Since: Jun 2003
Location: Mission Viejo CA
Default

CA smog law is very specific. It is not legal to install parts on your engine that is not OEM replacement or equivalent, or not C.A.R.B. approved (50-state legal). So technically, the only thing you can do to an L98 TPI is replace the runners with bigger tubes then port and polish the upper and lower plenums for better flow. That's technically of course.

In reality, your smog inspection results will vary from inspector to inspector. These cars are approaching 20 years old so most inspectors won't even remember what is stock and what is not, let alone which years are suppose to have the TPI and which do not. The important thing is the APPEARANCE of stock and retaining all smog related equipment, in addition to passing the sniff test.

So once you get all your parts sorted and the motor running cleanly, your next challenge is to find a "friendly" smog inspection station/inspector. Usually, you will find one of these if you find and get to know a local speed shop who "sends" most of their clients there. wink-wink

An alternative is to go to the TPIS website and get their Big Mouth Lower plenum plus the Big Tube Runners, then have the upper Plenum ported to match, then the throttle body replaced with a bigger 52 mm. TPIS also sells preprogrammed Computer "Chips" in differing levels of engine tune. You can also have a chip custom made by TPIS by sending them your engine's specs and $$. You get the look of stock that won't attract all kinds of scrutiny. BTW, TPIS also sells a 50-state legal cam for the L98 that can take full advantage of opened up intake and exhaust for the L98. From what I gather, it is possible to get 350 bhp from an L98 with simple bolt on parts while using the stock bottom end while still passing the CA smog test with flying colors.
Rogue1 is offline   Reply With Quote
Old 03-11-2009, 08:14 AM   #18
96lt4c4
CF Senior Member
 
96lt4c4's Avatar
 
Member Since: Nov 2005
Location: Bardstown Kentucky
Default

I have been working on a similar project for a while but it has since been put on hold. I plan on running a complete LT1 top end including the heads. I did this so i would not have to mess with the bolt pattern in the intake. I plan on running water out of the ends of the heads. I drilled and tapped the factory crossover holes to 1/2 npt. I planed on just using the rear holes but I thought I might have a problem with air getting trapped at the front of the heads, so I may use all 4 holes. I don't have anything to put in yet either other than my truck.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Accessory brackets are out of a TPI f-body, I have about $300.00 in it so far.

Last edited by 96lt4c4; 03-11-2009 at 08:18 AM.
96lt4c4 is offline   Reply With Quote
Old 03-11-2009, 09:45 AM   #19
RandyJ75
CF Senior Member
St. Jude Donor '06-'07
 
RandyJ75's Avatar
 
Member Since: Jan 2006
Location: Mt Laurel NJ
Default

Quote:
Originally Posted by redrose View Post
nope.

having actually DONE several lt1 intake conversions (including my vette) and talked with at least a half dozen others who have DONE the swap, a stock L98 chip runs just fine with the lt1 24 lb stock injectors, pulls hard till the lifters pump up (6000+ rpm for most)...car runs like it got A-rods breakfast goodies.
Quote:
Originally Posted by geogolf View Post
heres a Lt1 on my 90, I am not much into how the motor looks but I do like how it goes to 6K also did 1.6 rr and pcm chip and 24# injs. used stock distr.
RR, I posted my response because I remember reading the problems George had getting his car to run right after the swap. Perhaps the reason is that his car (like mine) is speed density, and does not have a MAF?
__________________
1990 Coupe, Sold
RandyJ75 is offline   Reply With Quote
Old 03-11-2009, 10:29 AM   #20
Sinister87
CF Senior Member
 
Sinister87's Avatar
 
Member Since: May 2004
Default

For those looking to buy!

http://www.thirdgen.org/techboard/en...-s-lt-1-a.html
Sinister87 is offline   Reply With Quote
Old 03-11-2009, 10:29 AM
 
Go Back   Corvette Forum > C4 Corvettes, 1984 - 1996 > C4 Tech/Performance
Reload this Page modified lt1 intake for l98
 
 
 
Reply

Tags
better, flow, gain, heads, hp, install, intake, l98, lt1, manifold, plenum, polish, port, stock, tpi, truck


Thread Tools Search this Thread
Search this Thread:

Click for Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
[FL] LT1 intake manifold kit For sale Fast_vette89 C4 Parts for Sale/Wanted 15 03-31-2014 10:30 AM
lt1 intake on a l98? ar91c4 C4 Tech/Performance 20 06-11-2005 09:01 PM
Do we all agree that LPE 219 is the best choice for L98 ?? Daves90 C4 Tech/Performance 32 11-19-2003 01:44 PM
LT1 intake on my L98 BOBA VETT C4 Tech/Performance 36 06-05-2003 12:25 AM
has anybody got some results from swapping LT1 intake to L98? SonnyinVA C4 Tech/Performance 14 04-23-2003 04:54 PM
[Big Pics] LT1 intake converted w/ Fuel Rails FS Bill Reid C4 Parts for Sale/Wanted 32 01-11-2003 11:35 AM
LT1 Intake on L98 Completed SpedRacr93 C4 Tech/Performance 23 06-26-2002 03:26 PM


All times are GMT -4. The time now is 12:42 AM.


Emails & Password Backup

Search Engine Friendly URLs by vBSEO 3.5.2