I'm running the TNT F1 kit on my car (100 shot) and get some mild surging even with a full bottle. It isn't horrible but its noticable and I've had other people comment and ask me about it when I'm spraying. It also showed up on the dyno as my curve wasn't very smooth, it jumped up and down a little.

It does it even though:

-Full Bottle @ 1100psi
-After initial lean spike A/F evens out to around 11.5:1 and doesn't surge up and down at all like the hp curve.
-No FPSS which is sometimes the culprit in these cases

One thought I had was that I possibly need to take out a little timing? I remember hearing the '00 cars run more timing than some of the other years, could that possibly be the issue? Again this isn't any MAJOR surging and I picked up just over 100hp at the wheels on the 100 shot so it is spraying correctly.

Any thoughts?

Tim

 

Nothing??

 

List out your mods..

 

Just a TSP lid/filter, Hooker catback, NGK TR6's gapped at whatever is the normal recommendation is for n2o, put them in a year ago I can't remember, .040 maybe? 160 t-stat. Other than that I don't really have anything engine related done.

 

Man I dont see a fuel pump on the list!! It could be a fuel stravation surge so I highly reccomend a 255-340 walboro unit at least.. It could also have a bad conn on the ground or in the wiring..

 

Fuel starvation at 425whp? Also wouldn't I be closer to running lean if that was the case?

 

Are you using a fuel pressure safety switch? That caused surging on mine. I couldn't get it out even with adjusting it, so I bypassed it and don't use it. HOWEVER - I have a Racetronix 255 and have plenty of fuel pressure. Like Dave said, I would get a fuel pump. For all the more a pump costs, it is well worth the piece of mind it gives!

 

No, I don't use a fuel pressure safety switch. I'm gonna check the ground on on the n2o solenoid. I know the fuel is spraying fine because I have a nice even air/fuel ratio, no spikes. I doubt there is a problem with the n2o solenoid's ground either, but i'll check.

 

maybe its not engine or nitrous related.... it could be a stock clutch starting to slip which would defenitly cause a surging problem and it wouldnt effect your air/fuel obviously....might be something you want to look into if its still stock, i didnt see it in your mods.

 

Sorry I didn't mention the clutch, I do have a spec stage III and a Findanza Flywheel. But the surging was there before and after the new clutch, guess thats why I didn't even think of it. I mean I definately felt when the stock clutch was going, but the surging is a completely different feeling.

Tim

 

Only 425rwhp?? Think about that, it was designed to support 320rwhp from the factory, and that was when it was new.. Didnt you say it spiked real bad on engagment?? If so that is when the fuel pump is laboring the most.. You can do whatever, but if it was my personal vehicle I would have that fuel pump..

 

I defenitly start with a pump and go from there..goodluck