A Question to those with Dry nitrous experience
#1
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A Question to those with Dry nitrous experience
I am running a small dry kit (currently jetted at 75hp) and having some issues. During a pass the car will start to slightly "break up" nearing 5000rpm. After doing some searching and seeing that nozzle placement is so critical, I decided to change this first. I am now running 2 nozzles in the lid like the NOS kit, as per their instructions. However, this did not solve my problem. So I proceeded to run a fuel pressure gauge and noticed that when the car breaks up, the gauge flickers.
Note: The car has 42# injectors and has been dyno-tuned with them.
Here are my questions;
How much hp can a stock in-tank fuel pump handle? In current form my car makes 384 rwhp (off the bottle) on a dynojet.
I am running unported 243's slightly milled (.020) could this be too much Static compression for pump gas even with 4 degrees of timing being pulled?
I am running TR6 plugs gapped @ .035, is it possible this gap is too wide?
Note: The car has 42# injectors and has been dyno-tuned with them.
Here are my questions;
How much hp can a stock in-tank fuel pump handle? In current form my car makes 384 rwhp (off the bottle) on a dynojet.
I am running unported 243's slightly milled (.020) could this be too much Static compression for pump gas even with 4 degrees of timing being pulled?
I am running TR6 plugs gapped @ .035, is it possible this gap is too wide?
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I think your right and it does sound like your stock pump just can't keep up. there is no set level that the pump isnt going to keep up, but you are in the general area that it can't. I would drop in a racetronix kit and i think that will take care of your problem.
everything else looks fine to me, good on timing and plugs
everything else looks fine to me, good on timing and plugs
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Thanks for the responses!
Flicker means that the gauge went down roughly 5lbs but then returned. It seemed to happen simultaneously (breaking up, and pressure drop).
A/F on the engine is a good question. I was not present for the dyno tune and the sheet doesn't show A/F. However, when I put the car on a friends dyno the wideband showed it was perfectly flat but, the wideband on my friends dyno proved to be malfunctioning at the time. (It was reading substantially leaned than a brand new calibrated wideband) Based on the new wideband on hp the car is running roughly around 13:1 on hp. When I attempted to spray it on the dyno, It went lean.
A/F on the engine is a good question. I was not present for the dyno tune and the sheet doesn't show A/F. However, when I put the car on a friends dyno the wideband showed it was perfectly flat but, the wideband on my friends dyno proved to be malfunctioning at the time. (It was reading substantially leaned than a brand new calibrated wideband) Based on the new wideband on hp the car is running roughly around 13:1 on hp. When I attempted to spray it on the dyno, It went lean.
Last edited by Sofls1; 07-31-2009 at 11:40 AM.
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#14
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If it only drops 5lbs and then returns i would suspect something other than fuel pump? What about your filter? are you running a fuel pressure shut sw?
The voltage issue is an issue that is far more common than many realize. Do you have a bottle heater that may running when noids are engaged?
Robert
The voltage issue is an issue that is far more common than many realize. Do you have a bottle heater that may running when noids are engaged?
Robert