944hal

Thanks everybody. Great input!

Oddjob

The aftermarket chip will not have the overboost limit, so that is why it ran well.

Stock dash gage is not accurate enough to determine +/- 1 psi, which is enough to trip the fuel cutoff on the factory DME chip.

The clubgate is why you are hitting the overboost protection. It is PCA legal, but does run higher boost than the factory WG. I have two of the clubgates and have done bench testing to determine opening pressure and valve travel compared to factory WGs.

Technically, if you want to follow the intent of the PCA rules, you cannot put a Turbo S KLR chip in a K26/6 car. But in reality, its unlikely that the Turbo KLR chip will increase boost much, if any, over the stock KLR chip when still using the 26/6 turbo. I am not sure the cylcing valve mapping on the factory KLR chips vary significantly.

The boost onset is slightly later w/ the K26/8 than the 6/6 (approx 500 rpms), but I think that is more due to the characteristics of the turbines, than the chip mapping. And possibly the same with the boost level above 5k rpm.

67King

Guys, Hal is my father-in-law (and for those that don't know me, I spend most of my time on the Turbo/Turbo S forum). He/we have been fighting this for about two years, literally. John w/ Vitesse has been helping us out, as well. We've swapped just about everything (AFM, ref/speed sensors, TPS, non-S DME and KLR, coil, etc. - putting in my Autothority chipped DME and KLR solved teh problem) on the car, and as he laid out, it is running into an overboost situation, and hitting limp home. John explained to us that it should really be called overload, rather than boost, as it is more about the airflow than the actual boost level. And with Hal's car, we are definately hitting it.

Purpose of seeking just a stock S KLR chip is to maintain compliance, should he end up running the car as an S, rather than a non-S. I have a spare 26/8, so that is a pretty easy option if we want to go there. The difference is the weight penalty, but the car needs to lose a lot more weight to hit the minimum for the non-S, so it might be easiest to turn it into an S.

Josh B

Found another KLR chip (1267355138) this evening but it appears to be an early one after reading these threads.

https://rennlist.com/forums/944-turb...ght=2227355531

https://rennlist.com/forums/944-turb...ght=2227355531

and finding this

PORSCHE 944 TURBO 95161811302-TYP 951 KRW-01 (Turbo) CHK: DF98 BOSCH 0261201014 1267355131

PORSCHE 944 TURBO 95161811302-TYP 951 KRW-01 (Turbo) CHK: E6B6 BOSCH 0261201014 1267355138

PORSCHE 944 TURBO 95161811302-TYP 951 KRW-01 (Turbo) CHK: EA95 BOSCH 0261201014 2227355531

Here - http://www.elecauto.com/vol440.htm

944hal

Josh,
Yes, the 1267355138 is an earlier one. That number matches the stock KLR that I have. They are 24 pin chips. All the responses I've got back indicate there isn't that much difference. I'll flip flop chips next time at the track and see what the difference is.