L98 Intake Porting Questions...
Thread Starter
Drifting
Joined: May 2002
Posts: 1,432
Likes: 0
From: Southeastern Louisiana
St. Jude Donor '05
L98 Intake Porting Questions...
A couple of questions... On a stock L98 engine, what kind of performance numbers can I expect from porting/polishing my intake, including plenum, runners and intake base? Also will I then need to move up to a 52 or 58 mm TB? What will the addition of the new TB do? Thanks for the input.
Burning Brakes
Joined: Aug 2000
Posts: 1,146
Likes: 2
From: Albuquerque NM
Re: L98 Intake Porting Questions... (Blueyednd)
expertly and fully porting the manifold base will result in 7-12 HP (see ligenfelter's website) Best cost effective thing to do is to chunk the whole thing. Moving to a 52mm TB will also imporve hp by a few. These mods really strive for/work for motor that have the "full package"-whatever that means to you.
Safety Car
Joined: Apr 1999
Posts: 4,623
Likes: 2
From: Ohio
Re: L98 Intake Porting Questions... (Blueyednd)
Not worth the time and effort. Adding a 52mm TB is especially a waste. The base and runners are super restrictive. There's usually an intake setup floating around the "for sale" section that's not too outrageously priced.
Le Mans Master
Joined: Jul 2001
Posts: 8,183
Likes: 3
From: Santa Maria, CA
Re: L98 Intake Porting Questions... (Blueyednd)
58 mm TB? What will the addition of the new TB do?
Melting Slicks
Joined: May 1999
Posts: 2,037
Likes: 0
From: Sarasota FL
Re: L98 Intake Porting Questions... (Vic'89)
Porting the plenum, base, and runners can significantly increase their potential - do you have the heads, cam, and exhaust to take advantage. If you are going to spend money on the porting, save it and buy a better intake setup when the car needs it.
Le Mans Master
Joined: Aug 2000
Posts: 5,192
Likes: 1
From: Airport Cruise-in 1 Veteran Airport Cruise-in 2 Veteran
Cruise-In II Veteran
Re: L98 Intake Porting Questions... (Blueyednd)
I wont know what kind of gains the TPI porting gave me b/c I did many other mods at the same time. The only thing that would show on a dyno is how many more RPM I gained. In stock form, the HP died off just shy of 4400 rpm's. I might have gained 3 or 400 more RPM but I won't really know until I do some trans work and get it on a dyno and I won't be able to dyno for a while. :(
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