We got our new Porsche XEDE installed and functional on a 911 Twin Turbo last night. Going to do a comparison between the stock ECU, a popular one-size-fits-all $4000 (!) reflashed ECU and the Stock ECU w/XEDE. Can you guess which one will work the best?

Check out the new front page of the website:

http://www.vishnutuning.com/welcome0.htm

Cheers,
Shiv

 

Nice!

I got a ? About the Porsche. Now I don't know if this made it to production yet but Porsche engineers were developing an individual ignition system with knock sensors on each cyl. If for example number 3 cly got a knock reading the ECU would pull timing only in that cyl. Have you seen this yet? How would this affect Xede's timing control?

Thanks
Eric

 

..

 

SAAB has had that since 1992. They use a current draw across each spark plug to judge each cylinder for knock. The original APC turbo engine control had it. SAAB also controlled each cylinder separately.

Erik

 

Joey...you should get him on line tonight and let Shiv convince him in person...after all the "Chat to Shiv" event is not just for evo owners...here is the link to register
http://forum.dyno4mance.com/viewtopic.php?t=28
regards
Andrew

 

Really good info I did not know that. But Ps system is different and uses the knock sensor instead of the spark draw.

Saab is an awesome engineering company. They made the first variable compression head. The Head tilts depending on the RPM so you have low end tq for lower RPM driving and hi-end power under boost that is less knock resistant because of lower compression.

NEET STUFF!

 

The cool thing about the SAAB system is that except for a hi-performance CPU in their engine controls is that it cost nothing. It also is able to predicte knock pretty well.

 

It wouldn't. Nor would the factory knock control system be compromised in any way. That's the advantage of a true interceptor type ECU device over a stand-alone with relatively Mickey Mouse knock control.

Shiv

 

That's why your the man

 

aw shucks

 

Shiv, i dont know if you know this, but that website that you are linking to only lets you view it for about 5 or 10 seconds before it turns into another page.

 

I would like for him to talk to Shiv, but we have an engine and tranny to install in another car tonight and he is having a stint put in an artery tomorrow so he has a few other things on his mind. He does NOT like my little Evo being faster then his wicked looking Porsche though! It is a 90 C2 cab with the turbo flares and the 993 turbo S wing and it has been lowered with a perfect solid black paint job from Stewart's in Dallas. Beautiful car, but it needs a different engine managment system as it has been changed over to dual 993 based exhaust with different cams and some head work. A supercharger is coming soon so he will have to change the engine computer to handle the extra flow along with a MAS metering system. The Xede would be perfect with the timing control and injector scaling ect. I will have to keep working on him about the Xede.

 

I cant make the links work.

 

Just finished up the first tuning session with the 911tt. With the stock ECU, it made just under 300whp. With the remapped ECU, it made 320whp. With the stock ECU and the XEDE, it made nearly 370whp with a flat torque curve (no spikes, no fuel cut, no drop outs, etc, as was the problem with the remapped ECU). The power difference, at 6500rpm, between the remapped ECU and the Stock ECU/XEDE combo was a staggering 140whp! The results are so alarming, I'm not even going to show dyno graphs here or on any Porsche forum until we get some more cars to verify that the results aren't abberant. It's really that ridiculous. You heard it here first Going to install and tune an XEDE on a 996tt with europen car magazine sometime in the next month just to see if we can see the same gains on the new water cooled Porsches. I suspect we can from what I've seen on our dyno in the last few months.

Cheers,
shiv

 

shiv i am curious what sort of quirks the stock 911tt's have compared to our evos e.g. sensitivity to california gas/overly-rich regions in the stock ecu maps etc.

quantitatively and qualitatively (A:FR's, timing, boost), how does the stock tuning compare to an evo's profile?