Questions concerning pinging and MAF.

[Cobra351]

The other day I pulled my MAF sensor and cleaned it with some alcohol and Q-tip. Let it dry and put it back together. So today I go for a drive and notice some pinging under light load.(I run only 93-94 Octane).I have fought this before,but seemed to get better with my new performers.I backed the timing down to 10* BTDC,It was only at 13* and i still am getting pinging.I have replaced the IAC,TPS is set right.I am guessing it is related to my MAF. Can I disconnect it and run the car to see if that is causing my pinging? Or is there a way to test it to see if it is working correctly. It is a Pro flow meter.
Thanks, Phil.

 

[Cobra351]

Ok here is what I did.I unplugged the MAF and took the car out for a drive. Of course the power was down a little, but I got no PINGING on hills or anywhere. The car even ran smoother, no low speed bucking or jerking at all. I am wondering if this thing is causing my lean condition on the Dyno at low RPM's I was at 18:1 until I reach about 2600rpm and then I go to 13:5.the rest of the way up the RPM range. The MAF is calibrated for 24's and I am running 30LBers. I had called Pro-M before about this and they said it should not be a problem. Here is a pic it is not very clear though. How can I tell what MAF I even have? The tube the meter sets in says PRO-M on it and that is all. On the bottom of the meter there are some numbers and one of them says 70. I wonder if this is only a 70mm meter? which I would say is too small. I would think I would need a 80mm for sure.

 

[1105]

Your MAF is calibrated for 24lb injectors and your running 30lb injectors? Do you have a new chip or tweecer to change the settings because you need a maf calibrated for the injectors.. unless for some reason the 30's use the same thing as 24's

 

[Cobra351]

My thoughts exactly. I am going to have to invest in a Tweecer and get this thing dialed in.It is way too lean at the bottom.18:1 till 2600 has got to be adding to my pinging.and I think I can adjust my A/F and timing curve with the Tweecer. Yes?

 

[Grn92LX]

If your not using soem sort of tuning device to dial everythign in, you need your maf calibrated for the injector your running. I run 30's and a 24lb callibrated pro m 80mm, but I use a pro m remote optimizer that allows you to play with the maf voltage to get everything to work. IMO, its better than sending it back for a recal. You can change idle a/f and WOT a/f. They give you appx starting point for setting the 2 dials.

 

[1105]

With the tweecer you can change just about anything in the cars computer to what you want.

 

[Cobra351]

How about a EEC tuner? Are they compatible as compared to a Tweecer? I have a chance to get one reasonable.

 

[VIPERn94Five-0]

u need to get that thing calibrated correctly....

....unless maybe if your running a Cobra ECU??...i know the Cobra runs 24#ers but its MAF is calibrated for 19's....idk if it makes a difference wheb you upgrade though....

Anthony

 

[Grn92LX]

u need to get that thing calibrated correctly....

....unless maybe if your running a Cobra ECU??...i know the Cobra runs 24#ers but its MAF is calibrated for 19's....idk if it makes a difference wheb you upgrade though....

Anthony

Its not callibrated for 19's, its got different electronics than a GT maf.

 

[VIPERn94Five-0]

the Cobra uses the same MAF as the GT...the Cobra ECU is programmed to compensate for the MAF calibration....


Anthony

 

[VIPERn94Five-0]

straight from the FAQ at the top of the page


"the 94-95 Cobra (and GT) came with a 60mm throttlebody, not the 65mm alot of people believe it to have. The 93 cobras came with a 65mm.
Although the 94-95 Cobra came with 24lb injectors it still uses the same MAF (mass airflow meter) as the GT. The Cobra specific computer compensates for the 24lb injectors."