theory on boxster bolt on problem

[turtle]

ok - I can see that. But on the other hand, many accounts claim otherwise...just as many,such as yours, do.
I have had a few cars, and modded them all. I ran across this prob with my Z, and many of my friends with modern natural induction cars have had the same issue.
HOWEVER - to say that each car is the same is crap. We have a dyno at work (no emissions control in Tennesee makes for a lot of fast cars :P) and I have seen a 20RWHP difference on the same vehicle from baseline.
What I am getting at is I would like to see a consenus. It would be good for us all.
As for dyno inaccuracies - for me, it is the difference in the controls - that is to say, is it the same tank of gas? Is it the same humidity? How about the temp?
Has anyone mapped ECU response in these cars with a CONSULT piggyback?
If not, who sells the software for the diagnostics? I will graph it out if I can find it.
It would be interesting to see timing and injection volume graphs.
PS
I am not a mechanic, but have acess to bunches. Any tips would be welcome, and I will share all charts and findings after. I am really interested in ECU fuel response ratios.
Thanks,
Turtle

[insite]

the limits in the boxster motors are likely designed into the valve train. there's only so fast air can enter a cylinder through a given sized hole.

as for the knock sensor issue, GIAC and others have been tweaking these settings for years (i.e. optimizing for 93 octane, 100 octane, etc.)

[Porschekid]

Will GIAC do a custom ECU tune like you are suggesting?

[insite]

Originally Posted by Porschekid

Will GIAC do a custom ECU tune like you are suggesting?

not POSITIVE, but i believe yes. there are some others (can't remember all off hand) that will let you choose a map that is optimized to 91, 93, or 100 octane. don't know if anyone has dual map firmware yet.

[turtle]

OK, after reading the posts I went back and asked one of my techs that builds our upgrade jobs about leaning, knock sensors, and the role played in an engine set up with variable timing. REMEMBER I am not a tech, so if I cross something up, I apologize -
He described the knock sensor's role these days as an effeciency device - keeps the engine running at peak gas milage. I asked him about leaning out and detonation and he said more or less as follows:
The process of leaning out is a cycle, I think he called it a spiral, and happens over several cycles. Evidently sensors in the exhaust loop can pick this up, and correct it in the place of the knock sensor. You will still get pinging, at idle, but this can be corrected by an elevated idle setting.
This whole knock sensor thing came to me by way of Carlos Alvarez, who works for the Service side of Nissan USA, and HE got the tip when he pulled the cats off his M3 (not sure of the year). Said the car was running like crap, and retarded so far it was stumbilng under hard acceleration. So it worked on a Bimmer, works on the Z's...
Is GIAC the premier chip proger for the Boxster? I will ask them...

And eslai:

It made us nervous too...we waited till someone came in with enough money and balls to try it. I sure as hell wasn't the test case.

[turtle]

i've emailed giac and waiting for a response - will you guys know.
also - all acounts here say that when the MAF fails, you foul plugs. SO - it runs rich with a failed MAF=low temp reading is factory failure default. this is the first peice of the puzzle - how to get the ECU to run rich so that airflow mods such as intake and exhausts don't lean out the mixture.....
now to see what GIAC comes up with in regards to the knock sensor

[PorscheDoc]

GIAC does not disable the knock sensor, or any other sensor. This is what seperates the leaders in the industry from the local laptop tuner.