JasonAndreas

If you can, try a few WOT runs and look at the ignition timing on the hammer and then reset the ECU (pull the battery ground connector for 15 seconds) and try again. The 964 ECU can retard the ignition timing a maximum of 9 degrees in response to the knock sensors so it might be interesting to see how much you have left on the table?


The problem you are going to have is the stock AFM measures the volumetric flow rate of the intake air and the ProMax chip is setup for that. A MAF measures mass flow (kg/h) so companies that don't know what they're doing use translation boxes to try and convert between the two signals but it doesn't work properly so they also need to tweak the fuel scheduling to make up for incorrectly metering and calculating the engine load factor. Without a chip written specifically for a MAF you are going to have some problems, the conversion (split second?) box won't work properly on its own.

Twood

Jason
Just so I am clear.
You are suggesting that I remove the MAF and go back to the standard air intake?
I am happy to do this and it will be interesting comparing the dyno reading between the MAF and the Promax chip.

JasonAndreas

Yes, I'm suggesting that if you use the ProMax chip that you also go back to the stock 964 AFM.

Having looked at (and posted) the ignition timing for other Autothority chips and comparing them with the timing set in the ProMax chip I'd be willing to bet a dollar that running your new chip will result in decreased performance!

Lorenfb

"If you can, try a few WOT runs and look at the ignition timing on the hammer and then reset the ECU (pull the battery ground connector for 15 seconds) and try again."

Jason is right on. The DME ECM will retard the timing after a few runs when knocking occurs,
and there after the knock count will be lower, i.e. unless the chip has "pushed" the timing beyond
the 9 degree knock control. Thus, the true measure of the knock affect is the initial count shortly
after the DME ECM is installed.

"Yes, I'm suggesting that if you use the ProMax chip that you also go back to the stock 964 AFM."

It's a MUST DO!

Twood

Thanks Loren and Jason-sometimes you know what you have to do but it good to have others confirm your own thoughts.
I will miss the MAF but for a daily drive car and occassional track car I think reverting to the orginal airbox and AFM will be the way to go.

promax_motorsport

Hi All,

The 5 recipients of the free offer chips (for 964) were:

Ken Hill
Bill Sybert
Gary Hill
Paul Wade
Rodney F Laszlo

All were sent out over 3 weeks ago on April 1. I've seen some feedback from a few of you (thanks to those that have done so already).

Did everybody receive theirs?

Regards,
Andrew
www.promaxmotorsport.com

wsybert

Got mine, thanks.
Had some family issues to take care of recently.
I should have a chance this week to put it in put some miles on it.
Will report as soon as I have a chance.
Thanks.
Bill