Electromotive XDI-2 tuning

[andy4dp]

Hi,

I just purchased a 1983 slant nose 911 that has been converted to a twin turbo. It has been bored to a 3.4ltr, mahl pistons, not sure what rods or cams they look like a form of SC cams. custom headers, twin k-26 turbos, twin plugged, and i just recently installed an electromotive XDI-2 system. I am new to tuning cars and have no experience, but I have started to play around with the timing chart and take the car for test drives. The car runs great under 3000rpm and seems to have a huge amount of power between 3500-4800rpm while it is building boost. However, once I get over 4800rpm the power seems to start to die down. I know that the redline of the car is 7000rpm. My mechanic assures me it is a timing issue, can anyone help me to figure out at what timing degree i need to be running at. I would say its almost at 1 bar of boost at 4800? or if i should advance or retard the timing when the boost kicks on.

Thanks,
Andy

[Jonty]

I would suggest getting the car to a professional tuner, Odds are it will end in tears otherwise. I would not suggest you start learning to tune on a P car, get a cheap Honda.
That way when you blow it up it won't hurt so much

[JFairman]

Totally agree with Jonty. Don't mess with timing unless you know what you're doing.
Adjusting timing on a 930 blindly is like giving a 25 year old girl a 930 to learn how to drive a stick shift.

[heliolps2]

do you have a map sensor , thats the thing that a vacuum line hooked up to it, It should of came with the system?

[andy4dp]

I Do have a map sensor with the program. I am just unsure what level that is suppose to be at, and I have only a slight idea about the timing. I went out and drove the car and changed the upper rpm and pressure timing by one degree at a time keeping all my timing under 30 degrees. My mechanic seemed to think this would fix the problem. While it might have smoothed out the transition between the "block" that i seem to hit at 4800 it just seems like the car still dies out above 5k rpm and it just doesnt have the acceleration that it does between 3500-4800rpm. If it is not a timing issue im not sure what it could be? Any help?

[heliolps2]

call Clewett engineering they can help you, they designed the product, the owner will be glad to help you over the phone.310-406-8788

[spence88mph]

That's very patriotic to attach the flag to your tail, nice work Helio.

[slow&rusty]

Andy - Need to see pics of this twin turbeaux beast!

[andy4dp]

I uploaded some pictures into my garage. I not sure how to upload them directley into the thread, if someone lets me know how i will.

[andy4dp]

[andy4dp]

nevermind, figured it out here are some pictures if you want to see anything specific let me know and i can take more. Also, i am planning on calling clewitt later today, i didnt know if anyone knew of any good porsche mechanics or tuners in NORTH CAROLINA?

Thanks