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View Full Version : 2.93 upper pulley? Which chip?


03CobraBro
06-07-2003, 02:46 PM
Here in the next few weeks I plan on ordering a pulley pack that comes with 3 different pulleys... I think 2 of them being 2.93 and 2.8...

From what I'v seen there is a less chance of a 2.93 Pulley slipping, so my question is how much of a difference is there between the 2.93 pulley vs the 2.8?

Also which chip do you guys think would would work the best with it?

Last but not least, how much of a power increase are we talking after a performance chip and a 2.93 pulley is installed. (based off of the average im assuming my car dynos around 370RWHP, I'm just taking an average there since I'v never dynoed it.)

Silver03Snake
06-19-2003, 12:46 PM
With JBS 1 5/8 headers, a Bassani o/r x-pipe and catback, and a drop in K&N, I made 411 rwhp and 394 rwt. With a 2.93 pulley, JDM CAI and JDM Flipchip I made 460 rwhp and 456 rwt. With the addition of a 2.80 pulley I made 478 rwhp and 474 rwt. As a general rule each pound of boost will be about 15 rwhp. But, with belt slippage you will not see these gains when you start to get over 14 psi.

I just added a four pound lower. My new peaks are 485 rwhp and 521 rwt. Torque will be accurate since it peaks at 3800 rpm well below the point where the belt slips. I didn't peak up much peak HP since my belt starts to slip a little below 5k rpm. The dyno owner printed out the spread sheet format on 100 rpm increments. I typed these numbers and my previous best in Excel side by side. At 4k rpm, I had a net increase of 50 rwhp and 66 lb.-ft of torque. It's not the same car on the bottom end. I just made my own idler system and I am installing it today. Jim at JDM is personally working on my chip today since I was a little lean. He said he thought he could richen it up and get some more power. I will dyno this Saturday and I'll post the results.

All numbers SAE on the same dyno.

BAD03SVT
07-15-2003, 02:25 PM
not trying to be a dick seriously. but 411 to the ground with long tubes and O/R h-pipe and catback. that for some reason seems a few low. did you dyno the car stock? was just wondering bud not trying to flame at all.

SStupid
07-16-2003, 05:16 AM
Similar results have been found by other who have installed headers without a pulley. When the pulley is added, the true performance advantage of the headers is seen.

03cobrarocks
07-28-2003, 11:14 PM
yea but i got 415 rwhp and 388rwhtq and all i have is upr cold air, steeda x pipe/cats, and steeda cat back