por9146gt

Just was at a race last weekend and there was a question about the legality of the adjustable fuel press regulator on our 944 turbo cup spec car.
Does someone have any info on what kind and rating the regulator has.
we have not touched this one per say and our mechanic told us it is set at factory spec, we have to do what ever is legal..........
Are there that much performance to be gained with the regulator, the car has the stock factory injectors. Any help or documentation is appreciated.

theedge

Well in theory, with chips and the regulator you could be making more power, as higher fuel pressure means a bit more fuel going in, even through stock injectors. That is prolly their concern.

One solution maybe is a fuel pressure gauge?

testarossa_td

I would lean in the direction of a gauge-if you can get away with it.

However there would be no way for the officials to make sure you did not adjust it after approval...and they like not to have to mess with things...thus the rules. Unless you had some sort of neat twisty wire with a seal like those turbo cup cam housing bolts

Oddjob

Canadian Cup Car? My guess is that the original "250 bhp" cup cars used the stock turbo 2.5 bar fuel press regulator. The later 290 bhp French Series cars may have upgraded the FPR to a 3.0 bar, but that is just a possibility. I have also heard that the US Escort cars may have used a higher rated FPR (I also would like to know for certain on this).

What I can tell you, is that none of these cars came with an Adjustable FPR, so PCA Scruts will come after you if you have one on a stock class car.

If the car is running fine with the adj FPR set to "stock" pressure by the mechanic, put a stock 2.5 bar regulator back on the car and avoid the issue. If it has been dialed up to match the chips youre using, then you may need to use the 3.0 bar regulator. The Bosch 3.0 bar non-adj regulator looks just like the 2.5 bar, so the scruts wont notice or take issue with it.

por9146gt

Well , all great suggestions, and I am like Oddjob waiting to hear from someone for sure what the specs were on these cars, I offered by the way after the boost was checked and found legal for them to put a fuel pressure gauge on it, but they said to check with someone that knows and keep that info in case there is a question again

special tool

Who are the genius officials questioning this?
You are most likely LOSING HP with that regulator if you don't increase air intake. You are not getting any more air into the engine with an AFPR.

The ADFPR is to be used in conjunction with a means to change injector duty cycle, not instead of. If you have a flat AFR on your wideband, but you feel that the line is 2/10 low, for instance, you may change the entire curve upwards with the adjustable regulator.

Konstantin

2.5 bar for all European cup cars except for the French one in 1990 which had 290 HP and 3 Bar with different chips and open exhaust

Konstantin

por9146gt

thank you , yup, I hear special tool since the boost is well governed and after 4 different runs up and down the front straight it was legal 1 bar, I thought well if i touched that regulator I would go lean or rich and not gain anything worth getting DQ over. They looked the car over because someone said it should not be lapping that quick???????Anyway Konstantin has some good info, Is it possible Konstantin to obtain a factory sheet or official info? and I am assuming that the cars had just the factory type regulators?

awilson40

you can also cheat by taking a stock 2.5 bar and slightly crush it in a vice to increase pressure to 3bar.
Easy to do and hard to catch

por9146gt

neat idea but we have been clean with the car so far and have done well, If we have to change a regulator to stay in the good graces of the scrutineers then we will. All in all we are trying to keep having fun, without having someone on our backs every race.

Konstantin

yes factory type with 0280 xxxx 227
2.5bar
or 0280 xxx 226,
3 bar regulator

I hav ethe data but it says nothing about the FPR and it is in German

Konstantin

tommye

Konstantin,
Do you happen to know if there is a 3 Bar regulator with the later style threaded hose connection as was used from MY -91 ? The 2.5 Bar version for these cars is 0 280 160 286.
Thanks,
Tommy

Asarus

Exactly...

* 250 bhp Cup cars : 2.5 bar FPR (same as stock)
--> Bosch 0280 160 227 without threaded connection
--> Bosch 0280 160 286 with threaded connection (late MY89 and MY90/MY91)

* 300 bhp Cup cars : 3.0 bar FPR (France for the 1990 season)
--> Bosch 0280 160 258 ou 0280 160 235 (without threaded connection for both)
--> i never found the part number for a 3.0 bar FPR with threaded connection. I use the AFPR from Lindsey for the 968 instead. Exactly the same threaded connection and you can set up the AFPR at 3.0 bar

In France, the Cup exhaust has always been fully free (no muffler at all) for 300 bhp but also for 250 bhp

por9146gt

Thank you all for your help, fabulous input
Konstantin if you could post the info even if it is in German it would be nice to have documentation
Merci Asarus, merci beaucoup

centerpunch

I have a 1987 Turbo Cup car that I bought new from Porsche Motorsport North America. I've autocrossed it, taken it to DE events, Brian Redman's Targa 66 events, but it has never been raced. It has under 20K miles on it.

I think it came with a 3.0 regulator. I can check (and even take a photo) if you like.....