senna21

I'd disagree. I drove a car that had the adjustable boost in it. Fantastic. But it also had a fuel cut that would kick in at 1.0-bar. That's the safest way to keep an engine safe. This is the way it would work. You turn the boost down for daily driving to save gas. Then if you'd like to run hard, you'd reach down between the seats to the HUGE brass boost **** and give it a turn and jump on the throttle (in second or third gear to give the engine some good load). Keep doing this until you feel a violent jolt as the boost reaches 1.0-Bar and the fuel is cut. Then you turn the **** back about a 1/4 to 1/2 turn and do it again. If you don't have the fuel cut out on you, that's your boost setting. Needless to say it would always be right at 1.0-Bar. I see a lot of guys running waste gate springs as the only defense but even with those you'll get boost creep. Remember, boost doesn't kill engines pre-detonation does. Boost just leads you to it.

But, if the car had adjustable boost and no fuel cut, I’d have to agree with you. However I can’t imagine they’d do one without the other. Then again people are stupid.

Trader220

One trip to far into the boost **** and kiss your rings good bye, and I speak from experience.

senna21

It shouldn’t if you have a proper working fuel cut. Just pushing in 1.0+bar air into the combustion chamber (with no fuel) isn't going to kill your rings or head gasket(s). But, having 1.0+bar air and fuel detonate might/probably would. That’s why I say fuel cut and not ignition cut. Fuel and air under high compression can/will ignite on its own if the conditions are right (i.e. knock). Eliminate the fuel and you’re just pumping air into the cylinders.

I'm very sorry to hear about your engine. Were you running with a fuel cut? I'm curious as if you were I'd like to know how the damage occurred. And also how much boost did you wind up “turning” into the engine?

A930Rocket

I don't understand the fuel cut off on a turbo car? If you are overboosting, why would you cut off the fuel and possibly lean out the motor at the worst time?

Richard930

When I got mine it had a 1 bar spring in it - first time I hit full boost it went slightly beyond 1 bar and I got the fuel cut out. I don't think leaning out is the problem when this happens - eating the steering wheel is the biggest worry. Happened once or twice more and scared the s**t out of me so I had it restored to .8 bar. I guess someone had shimmed the wastegate and had the 1 bar spring so it went too far - soon after that the clutch bit the dust, presumably because of the abuse of those couple of incidences (full power acceleration with abrupt fuel cut out). I've had some mechanics who I otherwise quite like and respect try to tell me that 1 bar is absolutely OK (even with the stock intercooler) and that 1.2 is even quite fine if the intercooler is upgraded - I'm not buying this as I firmly believe that too much boost kills these engines. Anyone can make lots of power by pushing boost to the limit, I want the engine to last longer than a service interval though.

FlyingDog

Can anybody tell me what seats are in that black DP on ebay?

jgrant

They look like the original race seats provided by DP (you can see the DP label on the headrest).

They sell a new version of the seat:

http://www.dp-motorsport.de/english/...ts935_spez.htm

Scroll down to the bottom.

Their site uses frames, so you can reach it at:

http://www.dp-motorsport.de/english/index.htm

Click on PRODUCTS --> DP35 --> RACE SPECIALS.

FlyingDog

Thanks for the link. I looked through all their models and could not find those older seats. I like the look of them more than the new style they have on the site.

jgrant

You may want to contact them, as they say they have 3 different styles...maybe one of them is the leather type shown in the car that's for sale.

Sameer

Did'nt know they were still in business. Are they still as good as before?

Steve 935

I agree with you. The true DP's were all assembled at the headquarters in Germany. It looks like smebody did a conversion on the black car. Looks like a decent job though.

Sameer

Guys,

With adequate cooling, a good a/f ratio and good octane like 94, your ok running between 1-1.1 bar of boost. The factory 964 3.3 turbo S came straight from the factory at 0.9 bar of boost pressure. Will the factory give a 0.9 bar spring if going 1 bar is dangerous? Many of us run at 1 bar and run safely at 1 bar. Slight fluctuations are normal, just make sure you run a good a/f ratio.

Steve 935

Even though I don't race my car I like to put 100 octane gas in it.My DP 935 also has the adjustable boost. No probems at all.

C2 Turbo

Steve,
Any idea as to where i can find the tail lights like yours,black borders ?

SoFast

Those black borders are Euro specs and you can easily find them on Ebay. I have seen them posted as I looked for 930 parts.