SFR-Still no turbo chips??
04-13-2002, 02:12 AM
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My test 951 is still at SFR. The car in "bone stock" trim baselined at 180 rwhp @ 8 psi. My last conversation with John put the car at 240 rwhp at 14 psi of boost with their custom burned chips. SFR's goal is to bring the boost to 18 psi, but something is stopping the boost @ 14. They are currently looking for vacuum leaks or failed parts wich could be causing the limited boost. The car has 60,000 mi and is 16 years young afterall.
04-13-2002, 04:20 AM
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Please let me know what happens w/this- I'm planning to chip my Turbo S in the next few months (after rebuilding bottom end) and would like to have as many options as possible. I'm also considering Steve R and Jon Milledge. Please post about them, or e-mail me when you get the car back...
Thanks,
Robby
Thanks,
Robby
04-15-2002, 02:13 AM
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+60 hp @ 14psi? 
That's not good enough??!!
I'd like it if somebody offered chips that improved performance without bumping up the boost too much. Seems like the extra engine wear isn't worth it after a certain point.
That's not good enough??!!I'd like it if somebody offered chips that improved performance without bumping up the boost too much. Seems like the extra engine wear isn't worth it after a certain point.
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04-15-2002, 03:57 AM
#8
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Well, 14psi is really nothin' for these cars. Especially when you consider how much time in their total operating hours is actually spent at full-throttle and full boost.
It's simply not possible to increase power significantly without turning up the boost. In stock trim, Porsche did a pretty good job of tuning the car. Sure you can fine-tune the air-fuel mixture and advance the timing a bit, but that's it. Might be worth 10hp, maybe 15 max.
The secret to increasing power is to increase the amount of air that flows through it. That means free-flow exhaust and intakes, and... increased boost. Then with more air in the chambers, more fuel can be added to maintain the best power-producing ratio of 12.5:1 and BOOM, you've got a bigger bang than before.
I've been running 15psi for about 2 years now without any problems. There are others running 18psi+ and I know of several guys using 25psi; one of them with nitrous on top of that!
Durability isn't so much of a concern if you've got the proper air-fuel ratio dialed in at full-throttle/full-boost. That's really the secret and that requires, at a minimum, dyno time and custom-chips or an aftermarket EFI system.
It's simply not possible to increase power significantly without turning up the boost. In stock trim, Porsche did a pretty good job of tuning the car. Sure you can fine-tune the air-fuel mixture and advance the timing a bit, but that's it. Might be worth 10hp, maybe 15 max.
The secret to increasing power is to increase the amount of air that flows through it. That means free-flow exhaust and intakes, and... increased boost. Then with more air in the chambers, more fuel can be added to maintain the best power-producing ratio of 12.5:1 and BOOM, you've got a bigger bang than before.
I've been running 15psi for about 2 years now without any problems. There are others running 18psi+ and I know of several guys using 25psi; one of them with nitrous on top of that!
Durability isn't so much of a concern if you've got the proper air-fuel ratio dialed in at full-throttle/full-boost. That's really the secret and that requires, at a minimum, dyno time and custom-chips or an aftermarket EFI system.
