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> Driving a Turbo Porsche at Lime Rock, for you enjoyment
TimT
post Oct 16 2004, 08:57 PM
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Chief instructor from a local BMW club called and needed instructors. I really dont like to turn down free track time (IMG:style_emoticons/default/cool_shades.gif) so my friend and I drove up for the day.. My 914 stayed home and took a break.... so

heres a lap at Lime Rock in a 2004 Porsche 935. I know they havent made 935s' for about 20 years, but this is the beast we built. video just cant capture the sensation..

ENJOY
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brant
post Oct 16 2004, 09:12 PM
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Is that a pickup truck at the end..
now I know how all the GT 1/2/3 guys feel when they blow by my "I" class stock car running in exhibition...

wow...

brant
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TimT
post Oct 16 2004, 09:16 PM
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Yea thats an ex-Nascar truck... you can pick them up for not to much dinero.

went by him like he had the e-brake on (IMG:style_emoticons/default/laugh.gif)
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Aaron Cox
post Oct 16 2004, 09:20 PM
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the woosh from the turbos is incredible
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seanery
post Oct 16 2004, 09:48 PM
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laps go by quickly in that car (IMG:style_emoticons/default/w00t.gif)
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Jeroen
post Oct 16 2004, 09:50 PM
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BHOOOOYAAAAAAH!!!!!
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SirAndy
post Oct 16 2004, 10:02 PM
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best thing about the video, i can see that you took it easy and you're still passing them like there were standing still ...

like on that downhill right hand turn, you were just coasting through there,
that sounds like a schweet car!

(IMG:style_emoticons/default/smilie_pokal.gif) Andy
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TimT
post Oct 16 2004, 10:07 PM
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QUOTE
like on that downhill right hand turn


the diving turn is a real butt cheek clencher


In some cars after you pass under the bridge you just tap turn gas..in tis car you just gas ( or as Andy says coast ) LOL simply amazing..
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914helo
post Oct 16 2004, 10:42 PM
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WoW! What a beautiful sound (IMG:style_emoticons/default/clap56.gif) Looks like a lot of fun.
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Andyrew
post Oct 16 2004, 11:57 PM
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How much boost you running with that turbo? Doesnt sound like it fully spools up... (ie you can still hear the turbo under full accell..

Very nice! I'd love to see more...

Andy, his "coasting" was because if he gave it more throttle, and allowed the boost to come on he would have gotten very tail happy... Turbo's will just spin like a top when the boost comes on durring a high G corner..... lol, just watch me! (or dad... He'll be in fresno tomorrow... I got work... Grrrrrrrrrr)

Andrew
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914_1.8t
post Oct 17 2004, 12:19 AM
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QUOTE(Andyrew @ Oct 16 2004, 09:57 PM)
How much boost you running with that turbo? Doesnt sound like it fully spools up... (ie you can still hear the turbo under full accell..

Very nice! I'd love to see more...

Andy, his "coasting" was because if he gave it more throttle, and allowed the boost to come on he would have gotten very tail happy... Turbo's will just spin like a top when the boost comes on durring a high G corner..... lol, just watch me! (or dad... He'll be in fresno tomorrow... I got work... Grrrrrrrrrr)

Andrew

Can you please post some info on the car's specs..

what turbo(s) and engine?
how much boost?
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Stutgart46
post Oct 17 2004, 08:18 AM
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Do you have any pics you can include with the specs?
Great video.
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TimT
post Oct 17 2004, 08:25 AM
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the car only was running 0.7 bar. we tried to run it at 1.0 ,1.2, and 1.4 bar but it was bleeding off boost, we think the bow-off-valves arent holding, or the turbo just cant make that much boost.

specs:

engine:

3.8 Lt
962/935 hybrid cams
twin plugged
staged injection (12 injectors)
Haltech E6X engine managment
cross drilled crank
chebby nascar bearings
garret t40 hybrid turbo



trans:

short geared G50
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TimT
post Oct 17 2004, 08:35 AM
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The cars is built on a 1979 930 tub

ERP susp bits
Revalved bilsteins
14" rear tires
12" fronts


Attached thumbnail(s)
Attached Image
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ChrisFoley
post Oct 17 2004, 09:05 AM
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I have to bust my ass to do 1:01s with my N/A 1.8L. You do it even having to wait for slowpokes to get out of the way. It looks so easy with a little boost. (IMG:style_emoticons/default/biggrin.gif)
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Andyrew
post Oct 17 2004, 11:04 AM
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Tim, when we put our bigger turbo on the 944, we ran into a problem of the engine not holding the boost and blowing it out the main seal or whatnot. We never did figure it out.

driving the car, if you pushed the throttle down all the way, it would blow it out, and you wouldnt get much power...

BUT if I (dad couldnt do this correctly) pushed it maybe 80%, the engine could hold that, and hold about 17psi, Producing at least 370hp.. (it should make at least 420 with that turbo...)

I know we would blow oil out.....

Anything sound familiar?

BTW, very nice car!
Andrew
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914_1.8t
post Oct 17 2004, 11:10 AM
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QUOTE(TimT @ Oct 17 2004, 06:25 AM)
the car only was running 0.7 bar. we tried to run it at 1.0 ,1.2, and 1.4 bar but it was bleeding off boost, we think the bow-off-valves arent holding, or the turbo just cant make that much boost.

specs:

engine:

3.8 Lt
962/935 hybrid cams
twin plugged
staged injection (12 injectors)
Haltech E6X engine managment
cross drilled crank
chebby nascar bearings
garret t40 hybrid turbo



trans:

short geared G50

Do you have a compressor map for the T40?
But i think it should easily be able to be very efficient at that boost level. Probobly some other issue.
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iamchappy
post Oct 17 2004, 11:12 AM
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It sounds like the wastegate is opening and the turbo is at full boost most of the time.
my car sounds the same when the wastegate opens.
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Andyrew
post Oct 17 2004, 11:21 AM
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Looking at the video I'd say you could get another 75 to 150 more hp if you got the boost workin right...

I Think Chappy's right about the wastgate though....
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Aaron Cox
post Oct 17 2004, 11:22 AM
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QUOTE(Andyrew @ Oct 17 2004, 10:21 AM)
Looking at the video I'd say you could get another 75 to 150 more hp if you got the boost workin right...

of course, this is your "expert opinion" (IMG:style_emoticons/default/biggrin.gif)
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