280 Rear wheel horsepower on a low budget

Greg Gordon
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280 Rear wheel horsepower on a low budget

Post by Greg Gordon »

http://www.youtube.com/watch?v=epzfOY6t_WI

This guy bought my book, and built a budget supercharged engine. It has held up at at least two track events. It's using an Eaton supercharger from a Mercedes. It's mounted on the right side of the car and blows through an air to air intercooler into a reversed stock intake plenum.

The shocking part here, is that he lowered the compression by putting a 2.5 crank into a 3.0 engine. This is very unconventional, but somewhat surprisingly, it worked out well. 280hp at the wheels on stock components is pretty impressive.

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Re: 280 Rear wheel horsepower on a low budget

Post by Michael »

Nice - that looks like TunerStudio - do you know if he is running Megasquirt?
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Re: 280 Rear wheel horsepower on a low budget

Post by Greg Gordon »

I am 99% sure it's Megasquirt.

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Re: 280 Rear wheel horsepower on a low budget

Post by Giuliettaevo2 »

Using the 2.5 crank in a 3.0 has been done before.. :wink:

Stephan from Squadra did it a few years ago already on a 916 3.0 Spider. The 2.8 engine delivers an easy 330 bhp and 400Nm+.

dutch link. :wink:

And the SA 155 24v TT used this approach on a 24v 3.0. :D

One guy i spoke to was worried about the squish in the 12v heads but i can't see very much squish-area in the original design so i guess it's not too bad. :)
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Re: 280 Rear wheel horsepower on a low budget

Post by gtv-racer »

nice! What killed the engine? High revs?

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Re: 280 Rear wheel horsepower on a low budget

Post by Giuliettaevo2 »

Engines i talked about are still in service... :?

Also no need to rev them hard since their turbo'ed. plenty of grunt from down low. 8)
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Re: 280 Rear wheel horsepower on a low budget

Post by Zamani »

This is Han's car? I like to see the video of this SC car going against Niclas Rosengren's super modified 3.0 12V (232 whp). Super awesome!
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Re: 280 Rear wheel horsepower on a low budget

Post by Greg Gordon »

I would like to see that to, although I know the SC/car easily takes the hp/dollar contest, which is my point.

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Re: 280 Rear wheel horsepower on a low budget

Post by Mats »

Zamani wrote:This is Han's car? I like to see the video of this SC car going against Niclas Rosengren's super modified 3.0 12V (232 whp). Super awesome!
It sure looks like Hans talking to the operator... Can't say I Recognize the car though, the Trollspeed sticker on the fender is interesting though, they make a lot of 700+ Hp RallyCross engines and the They were the ones who made the Pikes Peak engine for Per Eklund. Huge track record.
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Re: 280 Rear wheel horsepower on a low budget

Post by 75evo »


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Re: 280 Rear wheel horsepower on a low budget

Post by 75evo »

75s vs. 348s

I think I've posted this before

http://www.youtube.com/watch?v=sP0OiWoffeI

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Re: 280 Rear wheel horsepower on a low budget

Post by Greg Gordon »

Yup, that's the car.

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Re: 280 Rear wheel horsepower on a low budget

Post by la_strega_nera »

Very nice.
I've often wondered about the 2.5 crank to drop CR - infact i even posed a question on another (non brand specific) forum asking about the outcomes of low boost, 9.5:1 3l vs higher boost, 8:1 2.8l.

One of these days I'll do something neat.
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Re: 280 Rear wheel horsepower on a low budget

Post by 75evo »

Greg,

Wasn't Hans' car a high compression 3.0 with forged pistons, but it didn't quite work out for him so he just put in a 2.5 crank to drop the CR?


Ben,

Isn't the days of the 8 or 7 CR days over? These days we're seeing superchagred S2000 with stock internals beating 360s.

I think with Greg's setup, good ecu, and good cooling a stock 3.0 12V with 9.5:1 can be in the E46 M3 territory, if the ring and pinion allows it.

For a road car, I think hi comp and low boost is the way to go.

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Re: 280 Rear wheel horsepower on a low budget

Post by Greg Gordon »

I don't remember Han's car having high compression. I think he built it this way.

I discuss the high compression low boost vs low compression high boost issue in my book. The short version is lower compression with more boost and timing is better for power. Doing it the other way around is better for everything else.

There is not much advantage on the Alfa V6 in going below about 8.5:1, at that point you can put in 20psi, enough to break everything. Plus supercharger efficiency starts to drop off pretty fast when you go much higher.


Greg

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