Hi All:

Last week we did the install of my Comptech S/C on my S2K 2002.

The installation was flawless. We installed the kit with the standard components but the only difference is that we used the 2004-2005 High Boost Pulley supplied by Comptech.

The car runs fine from low RPM to 8,000 RPM, however, when the cars reaches 8,000 RPM a hesitation starts all the way up to 9,000 RPM.

We dynoed last night and veryfied A/F ratio and WHP and the car gave out 292 WHP @ 8,100 rpm and it is still running too rich at that range. However, in order to lean the car up there, the AF/Ratio on the range under 8,000 RPM was becoming too dangerous. This was all @ .47 bars

After adjusting the Fuel regulator, we were not able to clear the 8,000 - 9,000 gap.

The sparkplugs where in great condition after the runs.

Has anyone had this problem? Any fixes? Ideas?

Thanks,

Everett

 

When you say the high-boost pulley from the 2004-2005 supplied by Comptech...you ARE referring to the 7lbs pulley right? If so, that's what I'm also running. I have no problem at all. All I did was turned the "fuel Pressure regulator" two full turn CLOCKWISE.

Since you had yours Dyno'ed and tuned and still wasn't able to fix it, dunno what to tell ya beside just giving Comptech a call. They're very helpful.. Good luck Bruhhh!

 

Thanks for the recommendation.

Yes. It is the 7lbs Pulley.

I am using the Iridium plugs supplied by Comptech. Did you have to adjust the Gap on the plugs?

Thanks,

Everett

 

A few things:

1. Spark plug gaps on a blown engine like ours should be around 0.032" give or take a couple thousandths. A too large a gap can result in the spark getting "blown out" at high rpm.
2. We've found that the Denso Iridium plugs, IK-24 at least, can produce a high rpm miss. Many have abandoned these and have gone with NGK copper racing plugs, one hear range colder.
3. It's possible that at high boost, your MAP signal is not getting completely blocked. Once the ECU sees boost, it will go nuts. Check the efficacy of your wiring connections as well as the MAP clamp device.

 

I have the same problem, it went off last year and now I have it once again, but my "hesitation" happens with a vortech and right before VTEC kicks in. It get's worse the higher the gear, it 5th gear on the dyno it was causing a lot of hesitation (about 2 seconds) last week.

We still also don't know what is causing this, I was guessing the A/F ratio but since you checked that one. I'm still running stock injectors, maybe there duty cycle is at 100% then and can't deliver more?

After the hesitation the engine runs well up to 9k, no probs beyond that. I too have NGK running with one hear colder.

Any suggestions?

Andreas

 

Hi Guys!

Thanks for the recommendations.

Quick Update, problem solved.

My installer installed ESM from a 12v source instead of 5v. Now the car is running great.

We dynoed today and got 314 whp.

Thanks again guys!!

Everett

 

Does this translate into the MAP seeing boost but the ESM was unable to hide it from the ECU? It kinda sounds like that's what it was.

 

Bingo my friend!!

Everett