If you were building for Nurburgring then 800 WHP would be feasible, desirable, etc. . I think that for a reliable 800 you`re going to need something huge such as a 42R. But, a 42R is probably not what you`d want for Buttonwillow.

For most CA tracks I`d guess that a 35R is just about as big as you`d ever want to go. A stroker and an HTA 35R is about it. So, maybe 630-650 WHP reliably on race gas.

I`d do a Red and a 2.2 myself and settle for 550ish on racegas. To get 800 as John and Nils indicated you`ll need a too-huge turbo which would be overkill for the CA short tracks.

 

/\okay, so your saying the 42r would be great. for a large track....perfect.
build the engine so it CAN handle the 800hp then put the 35r on it for smaller tracks..now were on to something....

so now what components would you go with..?? or would you just use a "shortblock" from one of the vendors??

 

Really? AMS ran the same engine for two or three season, driving it a lot harder then he will ever be. Unless he's going to hire a professional race car driver as well.


AMS 2.3RR with AMS CNC Head. 800 Hp HTA86 VP Import.

 

I dont think you need 800whp to have a good track car. Im sure you know that. A 42R is probably only good if your running 40+psi and it takes forever to spool whether its a 2.0 or 2.3... way to laggy for road racing. I think your best bet would be an AMS 2.3rr with a twinscroll 35r. Guys at full-race believe twinscroll is the way to go, and it does make a difference in spool times. Good luck on the project...

 

 

i have a 2.2l cosworth crate motor, love it! but i would also consider the ams 23rr with a headgames road race head!!!

 

Tomei Derive Phase 2. /thread.

 

VP Import is 25 a gallon. Unless budget is no issue using that as racefuel gets expensive really fast.

The 4088 can almost get it done, some of the BW turbos, possibly some of the new stuff from Garrett. With a 42 you'll need to run about 35-38psi. That will be hard pressed to last for long continuous stretches of time, but should be feasible as a 4-5 lap motor with good cool down.

 

2.2 because you get the majority of the stroke advantage of a 2.4 crank in a 2.0 block without having to worry about the geometry and RPMs that happens in such scenarios.


Scorke

 

that is a delicious engine sir...

 

fair enough...RPM may be of concern.

 

I just threw out the 42R suggestion facetiously, so I apologize. I guess I never gave the "large turbo for roadrace course idea" much thought, because, as a practical matter, I just couldnt afford it. But, regardless, you have posed an interesting question.

You have gotten some good answers already from people like John Shuber, John Bradley and Nils who have a lot of experience with this sort of thing. The FP Red which Nils runs on a 2.2 Liter engine seems the way to go for a bolton turbo for roadracing.

It has already been pointed out that the 42R is just to slow of a spooler for a circuit course and if you have to be running over 35 PSI for extended periods, then longevity will become an issue.

The 35R in all of its guises seems like the next step up powerwise, but it will not get you to the powerlevel that you are seeking. Apparently, John Schuber is running the new HTA-86 on an AMS 2.3RR longblock to the tune of 800 WHP on race gas.

The HTA86 would seem to be worth looking into for your purposes. It spools as well as an HTA 35R but is capable of over 800 WHP on Q16, or Import. Freddy302, had been running an HTA 35 and switched to an HTA 86 and gained 100 WHP at 30 PSI, producing 806 WHP.

 

if your going all out id go with 2.3rr

 

hope you have lots of road racing experience, 800 will not be fun for an ameature driver. defeats the purpose if youre not having fun.

i'd personally say a 2.2 with an fpred for the tracks that are near me. if 20k is your budget, i dont know if i'd drop 15 on a motor lol. just me personally. you always for get the little things, like 150 bucks for wheel studs, 140 bucks for lug nuts etc etc etc. i'd say start with getting the chasis where you feel comfortable, then add more and more power and retune chasis ackordingly.

 

badhabit: Shxxt, man, I am planning on moving to SLO county when I retire next year and building a roadcourse Evo and trailering it to all the tracks nearby like Button, Laguna, Infineon, etc.

I had been planning on getting by with a 2-Liter drop-in motor with a Red, but since you will be in the neighborhood with your big turboed stroker, then I will most likely turn up the gas and do something similar to what you are doing, just to be able to keep your tailights in sight.

I am getting to old for this sort of thing.