Minor surging
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Teching In
Joined: Apr 2003
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From: Cairo, NY
Minor surging 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
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
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Joined: Jul 2004
Posts: 304
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From: Texas
Originally Posted by GTP4UNME
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
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
Thread Starter
Teching In
Joined: Apr 2003
Posts: 35
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From: Cairo, NY
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.
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Joined: Jul 2004
Posts: 304
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From: Texas
Originally Posted by GTP4UNME
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.
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!
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Thread Starter
Teching In
Joined: Apr 2003
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From: Cairo, NY
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.
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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.
Thread Starter
Teching In
Joined: Apr 2003
Posts: 35
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From: Cairo, NY
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
Tim
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Joined: Jul 2004
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From: Texas
Originally Posted by GTP4UNME
Fuel starvation at 425whp? Also wouldn't I be closer to running lean if that was the case?