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How can you get 300hp?

 
Old 01-02-2019, 07:11 PM
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PF
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Default How can you get 300hp?

Hi.

Anyone have a recipe for circa 300 HP na with the 968 engine for a streetcar?

Advise appreciated

/Peder

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Old 01-02-2019, 09:49 PM
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just joshin
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Contact John Behe at RPR automotive in Glen Burnie Md 410-589-3966
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Old 01-02-2019, 11:41 PM
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My 968 motor is a John Behe tuned engine. 100 octane. Dynos at 251hp at the rear wheel, so I hear that's about 285 or so at the crank. According to John, my motor is not a crazy setting and he could get more out of it. So I concur - Call John Behe.
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Old 01-03-2019, 05:56 AM
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Ok thanks but I am in Sweden so John Behe is not an option Im afraid. Would be happy to know what was done to these engines to get the power.
​​​​​​
Thanks
Peder
​​​
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Old 01-03-2019, 09:35 AM
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RajDatta
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John owns a tuning shop. He will Dyno tune your car to extract more power by changing it to a more aggressive tune. Keep in mind, there is no such thing are free hp. With higher numbers come a smaller threshold for mistakes. Wrong gas and you could be blowing a head gasket.
You could try data logging your runs and providing him output and see if he can tune it.
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Old 01-03-2019, 11:40 AM
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Originally Posted by RajDatta View Post
John owns a tuning shop. He will Dyno tune your car to extract more power by changing it to a more aggressive tune. Keep in mind, there is no such thing are free hp. With higher numbers come a smaller threshold for mistakes. Wrong gas and you could be blowing a head gasket.
You could try data logging your runs and providing him output and see if he can tune it.
Hi.
Yes getting more power costs money no doubt which I am ready for. I havent seen much on tuned but yet street legal 968s though. We have People here in Sweden that can tune more aggressively aswell as suggested with Behe but I guess with 3liters there must be room for more power with sustained reliability? Has anyone tried different cams, better inlet manifold, freer exhaust? What I am searching for is if someone has a proven setup to extract more power still using regular gas and still passing through annual MOT?

Any experiences appreciated
Peder
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Old 01-03-2019, 12:57 PM
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Peder - contact user "Raceboy", he's the one making the VEMS ECU kits.

He worked on a 968 with a custom intake manifold (shorter runners/larger plenum/TB) and tuned it with aggressive timing for pump gas or E85 and got something like ~250rwhp. Totally stock engine otherwise.

He is in Estonia.
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Old 01-03-2019, 01:29 PM
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Old 01-03-2019, 02:38 PM
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Big cam lift and duration, as a byproduct, can have vacuum and idle issues for a street car..
But, then again, what RS calls "the big boys" aren't necessarily what I'd call big lift/duration since the specs aren't known, but it is noted there "with 12:1 CR or higher, which means engine teardown for pistons or severe head shaving. You'd need to find 8ccs to lose.

Your target is surely possible, I'd call/email Michael Mount and ask his recommendations.
With top class porting and a mild cam pair, maybe revised exhaust, sure to be worth the extra power you are looking for.

Easiest route for you would be to find a 3.0 cylinder head stateside that MM can do the work on while you still drive your car.

I'm doing a "recipe" on the smaller 2.5 16V that should be relatable (less variocam) and I am projecting +42hp over the stock 188.

Peder, PM incoming.

T
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Old 01-03-2019, 05:47 PM
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Thanks to all for your tips. I will contact Michael Mount and Raceboy and see which way forward is best.

Just to tell what I am planning. Goal is to build a "what if Porsche did a 924 RS"
I am using a - 86 924 S as a base and I am looking to create a really sleek, light and nimble car in true Porsche RS style. Goal is below 1100kg and 280+HP 968 engine. Should be a real blast and a true sleeper. Love the slim body of the 924.

/Peder
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Old 01-06-2019, 10:25 AM
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PF - please post your results. I've seen your other cars on Rennlist and they're impressive.
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Old 01-06-2019, 04:09 PM
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Originally Posted by sm View Post
PF - please post your results. I've seen your other cars on Rennlist and they're impressive.
Thanks SM! This project is longterm and only in planning phase now. If it all becomes real it really should be the best I can think of as a streetcar
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Old 01-06-2019, 06:36 PM
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RS Barn can provide more hp.
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Old 01-06-2019, 09:18 PM
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MN
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Anyone have a recipe for circa 300 HP na with the 968 engine for a streetcar?
A design1racing Supercharger would do it.

My understanding is to get substantial more power from the 968 motor requires supercharging/turbocharging of some sort.
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Old 01-07-2019, 04:39 PM
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Originally Posted by MN View Post
A design1racing Supercharger would do it.

My understanding is to get substantial more power from the 968 motor requires supercharging/turbocharging of some sort.
It will also blow his motor, like many did.
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