performance upgrade questions???????
Thread Starter
Instructor
Joined: Nov 2004
Posts: 136
Likes: 0
From: swedesboro nj
performance upgrade questions???????
I am in the process of upgrading my 89 L98 stock engine with 92,000 miles on her. These are the items listed below. What other mods are needed with this combo to get the best performance. Keep in mind this is a weekend cruiser.
TPIS LT Headers
SuperRam Setup
My questions is.. What heads do I need or can I use my stock ones
What cam is needed
Throttle body suggestions ect. ect.
Last but not least what kind of horsepower can I expect out of these mods.
TPIS LT Headers
SuperRam Setup
My questions is.. What heads do I need or can I use my stock ones
What cam is needed
Throttle body suggestions ect. ect.
Last but not least what kind of horsepower can I expect out of these mods.
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Originally Posted by dsnell1004
I am in the process of upgrading my 89 L98 stock engine with 92,000 miles on her. These are the items listed below. What other mods are needed with this combo to get the best performance. Keep in mind this is a weekend cruiser.
TPIS LT Headers
SuperRam Setup
My questions is.. What heads do I need or can I use my stock ones
What cam is needed
Throttle body suggestions ect. ect.
Last but not least what kind of horsepower can I expect out of these mods.
TPIS LT Headers
SuperRam Setup
My questions is.. What heads do I need or can I use my stock ones
What cam is needed
Throttle body suggestions ect. ect.
Last but not least what kind of horsepower can I expect out of these mods.
TPIS or LPE both offers a good CNC ported L98 aluminum head package. Or there are several aftermarket heads that you can go with, but be aware that your heads are built with a 58cc chamber volume and most aftermarket heads are made with 64cc chambers. I beleive only AFR makes them with 58cc chambers for the L98 cars. However most can be milled down to 58cc. With the SR manifold the cam of choice would be the LPE219 cam or something similar to that. It all depends on what other mods you have. Such as gear ratio, automatic or manual transmissions. Cams are not something that can be called more is better. More often than not when too much cam is installed performance will often suffer.
Team Owner
Joined: Sep 2001
Posts: 62,155
Likes: 1,731
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Get the LPE/Accel 74219 cam, and have the stock heads worked over or get AFRs. You should stick with the stock throttle body and injectors.
Then you'll need to have the chip reprogrammed after the cam change. After all of that, I would expect 390 crank hp.
In an automatic, I would also get at a 2400 stall TC.
Then you'll need to have the chip reprogrammed after the cam change. After all of that, I would expect 390 crank hp.
In an automatic, I would also get at a 2400 stall TC.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
You can either have your stock heads worked or buy a set of worked #113s and sell your stockers for $400-$500.
Then add a ZZ9 or 219 cam to round it off.
BTW, you can epxect close to 400chp from that setup once tuned.
Then add a ZZ9 or 219 cam to round it off.
BTW, you can epxect close to 400chp from that setup once tuned.
Last edited by 65Z01; Jan 30, 2005 at 08:06 PM.
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Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Originally Posted by dsnell1004
where can i buy a set of worked #113's
Thread Starter
Instructor
Joined: Nov 2004
Posts: 136
Likes: 0
From: swedesboro nj
should I worry about the bottom end of the engine? keep in mind it has 90k miles on her but she runs strong. is there a short block or long block I should consider buying?so as a recap
SR
TPIS headers
219 cam
2400 stall
flowmaster cat back
heads? trick flow ? will they work
= 400HP
also what about programing the chip. who does that and how much
SR
TPIS headers
219 cam
2400 stall
flowmaster cat back
heads? trick flow ? will they work
= 400HP
also what about programing the chip. who does that and how much
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Originally Posted by dsnell1004
should I worry about the bottom end of the engine? keep in mind it has 90k miles on her but she runs strong. is there a short block or long block I should consider buying?so as a recap
SR
TPIS headers
219 cam
2400 stall
flowmaster cat back
heads? trick flow ? will they work
= 400HP
also what about programing the chip. who does that and how much
SR
TPIS headers
219 cam
2400 stall
flowmaster cat back
heads? trick flow ? will they work
= 400HP
also what about programing the chip. who does that and how much
Sure how much you want to spend? There was a supporting vendor that was selling short blocks for what I thought was a very reasonable price.
Team Owner
Joined: Sep 2002
Posts: 22,209
Likes: 12
From: OBAMA IS HITLER
The TPIS/AFR competition ported 100% CNC'd L98 heads, set up with all the goodies up to .600" lift with 54cc chambers are approx. $1800 all said and done. The LPE version is about $2400, unless you send in your set as cores. I would get the TPIS/AFR heads, and sell yours, as was stated earlier good used D113's are worth $400-$500 and you should NO problem selling here on the CF.
Thread Starter
Instructor
Joined: Nov 2004
Posts: 136
Likes: 0
From: swedesboro nj
Well if I am going to piece things together I thought I might be able to just buy a short or long block instead. It's just a thought. what do you think? and what would I be looking at spending
Team Owner
Joined: Sep 2002
Posts: 22,209
Likes: 12
From: OBAMA IS HITLER
Originally Posted by dsnell1004
Well if I am going to piece things together I thought I might be able to just buy a short or long block instead. It's just a thought. what do you think? and what would I be looking at spending
