Don Terrill’s Speed-Talk

From 1988 thru 1992, there was a 1LE Camaro option with the L98 that was built for endurance road racing. It was also part of the old IROC series too. The 1LE package even had a fuel tank with dual pickups for preventing any fuel starvation through cornering. https://www.hemmings.com/stories/2014/0...

CHAMP car? Yep. Engine will go in an 80's Monte or a 70's F body. Have also considered a C3 but they are not great for tall drivers with a coupe body. There are a couple C4's running in Champcar that I assume are L98's that are fairly quick. They don't have any points to play with for engine mods h...

j-c-c wrote: ↑Sun May 02, 2021 11:12 pm Is a 4/7 swap penalized or detectable?

4/7 swap is fine.

Does it help with the tpi's somewhat restrictive plenum?

CHAMP car? Yep. Engine will go in an 80's Monte or a 70's F body. Have also considered a C3 but they are not great for tall drivers with a coupe body. There are a couple C4's running in Champcar that I assume are L98's that are fairly quick. They don't have any points to play with for engine mods h...

Forgot to add that it will be run with Holley HP, not the stock ecu.

Injectors are free points so if they need to be replaced with larger ones that is not a problem.

In kicking around various choices to power a 3000 pound endurance road race car, I came across some dyno tests that intrigued me as they seemed to kinda blow up some commonly held ideas on the old low RPM TPI setup. Like this 410hp 383 with a stock TPI system on it. https://youtu.be/4ofiHKfhYkc?t=55...

TPI just has too much working against it, runner length, plenum volume and the 180 turn with round tubes, the air gets in it's own way. I still want to mess with my own some more in the future and port another stock plenum to see if I can improve it a tad but it's the 180 runners I believe that are...

So what came of this? Curious what guys are able to get out of a TPI setup.

Been off and on watching this post. The "dog" 302 Z-28 in off the dealer showroom floor trim and tune was somewhat gutless, biggest problem was the cam. Once you changed to the "optional Z-28 off road" 140 cam and orange valve springs, good tubing headers, 4:88 rear gear and, th...