Dyno results - I want some opinions!

[Joes95GT]

And if correcting the A/F with fuel pressure doesn't do it, then look at the C&L MAF. It's curve may be off or the sample tube may not be in the best position clockwise. That curve sure is funky down low.

No insults intended to Mark, but I think that the problem lies within how some product is installed rather than the product itself being the problem.

Tom said what I was thinking to a T. You can't blame a CORRECTLY calibrated MAF for A/F ratios that bad. I'd look more into the 'clocking' of the sensor.

What gets me is that the fuel pressure is set at 39 PSI and it still runs that skank. Have you verified fuel pressure with more than one gauge?

Joe

 

[Killercanary]

Mark, I agree you are WAY rich... so there is definitely power to be had there. As for the C&L... my dad has the 76mm C&L setup on his 91GT. Originally he had a pipe in front of the MAF with a turn in it and a K&N conical filter on the end. The car was IMPOSSIBLE to tune on the dyno, and I mean IMPOSSIBLE. There was NO WAY to make repeatable runs with that setup. We were advised to try and put the stock airbox back on. As soon as we did BOOM... the problem was fixed and we were able to correctly tune the car. It was sickening as to how sensitive that meter setup was. Think about it, the C&L relies on the sampling tube to change the amount of air that flows over the MAF wires, anything that causes either turbulence and or sports within the MAF where air has either higher or lower velocity can trick the EEC into thinking either too much or too little air is coming in. I'd play with clocking the meter as suggested and making sure you have a straight shot into the MAF from the fliter if you don't already.

My car ran better with 14* and 15* of timing than it did with 16*.

 

[red94fiveo]

No insults intended to Mark, but I think that the problem lies within how some product is installed rather than the product itself being the problem.

Tom said what I was thinking to a T. You can't blame a CORRECTLY calibrated MAF for A/F ratios that bad. I'd look more into the 'clocking' of the sensor.

What gets me is that the fuel pressure is set at 39 PSI and it still runs that skank. Have you verified fuel pressure with more than one gauge?

Joe

All I have verified FP with is the guage thats mounted on the regulator. It is also very possible that my MAF is not installed/calibrated perfectly. I would swap the stock one back, but I have different injectors on now, so that ideas out the window. I will definetely look into the MAF for some solutions. Thanks for the suggestions.

Paul - I haven't had a chance to verify this on the dyno, but the car feels stronger at 16 than 14, so I didn't even mess with the timing on the dyno runs.