Lean Spike on Activation
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Teching In
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Lean Spike on Activation 04 A4 GTO Zex Direct Port
I am getting a lean spike at 3250 when my direct port activates. I am sure it is caused by the nitrous fuel lines draining the fuel rails. I dont think the stock pump can keep up with that first pull. It catches up very quickly, however, that lean spike makes me nervous.
Any ideas on what could help, until the fuel pumps for the GTO's come out?
I am getting a lean spike at 3250 when my direct port activates. I am sure it is caused by the nitrous fuel lines draining the fuel rails. I dont think the stock pump can keep up with that first pull. It catches up very quickly, however, that lean spike makes me nervous.
Any ideas on what could help, until the fuel pumps for the GTO's come out?
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also, i am getting a stumble at the activation point. everytime i hit 3250 the car stumbles slightly. my logs show a drop of 100-150 rpm at activation. this drop in rpm coincides with the lean spike.
any idea why?
any idea why?
Originally Posted by Nox
04 A4 GTO Zex Direct Port
I am getting a lean spike at 3250 when my direct port activates. I am sure it is caused by the nitrous fuel lines draining the fuel rails. I dont think the stock pump can keep up with that first pull. It catches up very quickly, however, that lean spike makes me nervous.
Any ideas on what could help, until the fuel pumps for the GTO's come out?
I am getting a lean spike at 3250 when my direct port activates. I am sure it is caused by the nitrous fuel lines draining the fuel rails. I dont think the stock pump can keep up with that first pull. It catches up very quickly, however, that lean spike makes me nervous.
Any ideas on what could help, until the fuel pumps for the GTO's come out?
Dave
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Originally Posted by Nitro Dave's Nitrous Outlet
You should put the universal walboro intank fuel pump in it.This will work.You could also look into installing a fuel accumalater from NX on this system.The stumble is from having no fuel.I would not run it like that.You will more than likely hurt something.
Dave
Dave
I have no plans to run it until the fuel issue is resolved.
Last edited by Nox; Apr 11, 2005 at 02:13 PM.
If the GTOs has the FP regulator in the tank like the f-bodies and vettes, that's part of your problem too. The accumulator may help, I havn't tried one. I've been getting split second lean spikes as high as 16-18.0 for 3 years and it's never done any damage, it's pretty common when pulling a larger wet shot off the rails.
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Thread Starter
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Originally Posted by Magic Chicken
not sure if the methanol is going to solve your problem, but let us know
why do you think it might not help?
i think they are saying when the noids open the n20 travels faster than the fuel. Makeing a lean condition for that split second. How do you expect the methanol to hit and atomize the same time as the n20. It would be the same as the fuel unless you somehow figure out how to let the fuel noid open first and then the n20. Then it wouldn't have a lean spike. I doubt it would have a rich either since the n20, but you might get puddling. Get a fuel pump man that'll fix the problem. You just might be cavatationg the rails for a split second and you just dont' get enough fuel in the line, and injectors.
Ive got a stand alone fuel sysem on mine and when I first hit it it spikes lean for about 500 rpms then drops off and evens out. I just assumed it was because the nitrous is running around 1000 psi and the fuel is only running around 10 psi causing the nitrous the reach the motor first. I havent worried about it as it only lasts for less then a second and its not ungodly lean but still is lean nontheless.
Yes the stand alone fuel system will solve your problem.
I have customers that have installed the intank walboro on the GTO.
The fuel accumalater was desighned for instances like this.When trying to feed all those lines and rails at the same time there is a fuel volume drop.The accumalater is a back up resevoir that will push fuel back into the rails when the fuel drops.
Its about 200.00.
Th intank walboro is about 125.00.
Dave
I have customers that have installed the intank walboro on the GTO.
The fuel accumalater was desighned for instances like this.When trying to feed all those lines and rails at the same time there is a fuel volume drop.The accumalater is a back up resevoir that will push fuel back into the rails when the fuel drops.
Its about 200.00.
Th intank walboro is about 125.00.
Dave
Hey dave...any word on the billet microswitch bracket for the GTO yet. I need to get a WOT switch for my GTO, I have allready left the system armed and backed off the throttle once!!! Luckily no damage...
I sent back in the prototype with additional measurements and pics some time ago...tried cobbling up one and it didn't work well!!!
Scott
I sent back in the prototype with additional measurements and pics some time ago...tried cobbling up one and it didn't work well!!!
Scott
Originally Posted by SDB
Hey dave...any word on the billet microswitch bracket for the GTO yet. I need to get a WOT switch for my GTO, I have allready left the system armed and backed off the throttle once!!! Luckily no damage...
I sent back in the prototype with additional measurements and pics some time ago...tried cobbling up one and it didn't work well!!!
Scott
I sent back in the prototype with additional measurements and pics some time ago...tried cobbling up one and it didn't work well!!!
Scott
Just waiting on them to come back from the machine shop.Hopefully soon.
Dave
Originally Posted by Nitro Dave's Nitrous Outlet
Scott,
Just waiting on them to come back from the machine shop.Hopefully soon.
Dave
Just waiting on them to come back from the machine shop.Hopefully soon.
Dave
Dave, do you need a stand for a refill station IF the mother bottle has a siphon tube using the NX refill station???? How do I tell if my bottles have a siphon tube in them (the 65 lb cylinders)?
Originally Posted by Nitro Dave's Nitrous Outlet
The fuel accumalater was desighned for instances like this.When trying to feed all those lines and rails at the same time there is a fuel volume drop.The accumalater is a back up resevoir that will push fuel back into the rails when the fuel drops.
Its about 200.00.
Th intank walboro is about 125.00.
Dave
Its about 200.00.
Th intank walboro is about 125.00.
Dave
Still a little confused on how it would work... Is there a link? Sounds like an interesting idea, but I am doubting how well it would actually work..
