300 h.p.
Thread Starter
Instructor
Joined: Nov 2006
Posts: 189
Likes: 0
From: Keaau Hi
300 h.p.
What would be required to squeeze a measly 300 horsepower of an 89 L-98. Plans include exhaust and hotter ignition. Air foil, tornado
would I have to do a cam change and get into the motor, it's just a
street toy or are there easier ways
, maybe I cpuld just lose 40-50 pounds and lighten things up.
Thanks Vetters
would I have to do a cam change and get into the motor, it's just astreet toy or are there easier ways
, maybe I cpuld just lose 40-50 pounds and lighten things up.Thanks Vetters
Melting Slicks
Joined: Oct 2006
Posts: 2,314
Likes: 3
From: In a van down by the river! Florida
you mean a +300 bump?
Yeah, you're gonna have to get into the engine, and get some forced induction, and a crapton of money.
If you just want to get to 300WHP then I'd say some intake work should be your first stop. I'm not that familiar with L-98s but I've heard a ton of talk that thats your weak link. Hopefully some of the L-98 guys will jump in here for better info.
Yeah, you're gonna have to get into the engine, and get some forced induction, and a crapton of money.
If you just want to get to 300WHP then I'd say some intake work should be your first stop. I'm not that familiar with L-98s but I've heard a ton of talk that thats your weak link. Hopefully some of the L-98 guys will jump in here for better info.
Instructor
Joined: Sep 2006
Posts: 220
Likes: 0
From: Castleton NY
the easiest way (maybe not the cheapest) is a supercharger. No question. But if that is not your style, you are going to have to open up the engine. All the bolt-ons out there aren't going to free up 60 to 70hp.
Burning Brakes
Joined: Aug 2005
Posts: 1,172
Likes: 9
From: '88 TPI L98/HotCam Powell, Ohio
If you are looking for a noticeable increase then start with the exhaust. Headers and a free flowing full exhaust will put you around 250 rwhp (peak) but it is a 40-50 Hp increase @4500-5000 rpm vs stock. If that isn't enough of an improvement then...1.6+ RR's, heads,cam +super Ram should put you in the 300 rwhp ballpark.
Team Owner
Joined: Sep 2001
Posts: 62,145
Likes: 1,730
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
What would be required to squeeze a measly 300 horsepower of an 89 L-98. Plans include exhaust and hotter ignition. Air foil, tornado would I have to do a cam change and get into the motor, it's just a
street toy or are there easier ways, maybe I cpuld just lose 40-50 pounds and lighten things up.
Thanks Vetters
would I have to do a cam change and get into the motor, it's just astreet toy or are there easier ways
, maybe I cpuld just lose 40-50 pounds and lighten things up.Thanks Vetters
No airfoil and no tornado, no need for expensive ignition parts because stock HEI will be just fine with the TPI engine.
there are more details on my website, but longtube headers, bigger base, ported plenum, AS&M Runners should get you to your 300chp level. Further would require a cam change.
Safety Car
Joined: Dec 2004
Posts: 4,088
Likes: 0
From: Poop land
I dynoed at 275 hp, 305 tq to the wheels with 12 degrees of timing, a Miniram and a free flowing exhaust. About 330 hp, 365 tq at the crank. This explains my low 13 second passes with 105 mph trap speeds. I'd hope to do better with my 2.5" true dual exhaust. 
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