Going with slightly smaller pulley - need new chip burned?

[blownwindsor]

Good look with the car but do you have the name of the company that makes the rims wider. thanks

[Z's Cobra]

I think the company is Weldcraft Inc. in Michigan. I think their number is (734)420-2211. At one point I had found their website, but I've lost the link.

[paluka21]

Originally posted by Z's Cobra
Update - have a dyno session scheduled for Saturday. I'll let you guys know how it goes. Anyone with any suggestions on what I should pay attention to at the dyno? I've been told to shoot for a 12:1 or 12.5:1 a/f ratio and to make sure my fuel guage continues to go up as the RPMs climb. The only adjustments I can make are to the adjustable fmu and the timing. I think I'm running like 12 degrees initial timing right now and the JMS chip brings the timing back in the upper RPMs. Any dyno and tuning experts chime in before Saturday with any good advice.

How did the dyno session go for you? Again, when I was running the 119mph traps as you did, I was around 460rwhp and 430ish rwtq.. with 11:1 a/f and 22 degree total timing.
Let us know!

Dan

[WA2FAST]

Yea, I too am curious on how that went for you.

[Z's Cobra]

Well it went ok. I was a little disappointed. The dyno showed 440 rwhp and 426tq. I was disappointed because I was certain it would take more hp than that to move such a heavy car to 119 mph traps. Of course, I may be making power much sooner than before the pulley swap, I just have to compare the dyno sheets. Unfortunately, the fuel started dropping off in the upper rpm range. I run the good high output walbro intank pump but I'm also running the external pump that ati supplied with my kit. I think maybe that external pump is acting as a restriction and that I should dump it. I'm going to send the dyno graphs to JMS and ask their opinion on the pump set-up. I have 42lb injectors so my injectors should be fine, but JMS might need to recalibrate the duty cycle.

My friend scanned the dyno sheets and emailed them to me so I wil try to post the dyno sheet and a/f sheet later when I have time.

[WA2FAST]

Please post your findings on the fuel pump setup... btw, what setup do you have currently? I am running a 255lph in tank and I have a 255lph external fuel pump... I have heard before that it is not good to have the same size pumps both in and out, so I am a bit worried.

[Z's Cobra]

I'm running the high output 255 walbro unit intank and the ati supplied external pump. I don't know what the ati external pump is rated at but I'm going to call ati to find out.