Made a couple passes with Magnum. Stock everything but N2O kit. It is a wet system using a holley pump on fuel side. Jetting is 57n/33f with 900 psi bottle/ 6 lbs gas side. What my question is that at the top of each gear change the AFR spikes to about 14 to 1. On the rest of the pass its around 10.8 to 1/11.9 to 1. Is a programmer now needed to correct this or am I missing something. Best was 1.86 60 ft 12.43 @115.7. I did close new plugs to .025
Last edited by haywood1; 12-01-2009 at 04:54 PM. Reason: added
Do you have a window switch installed? If so, what are your settings?
Also, 11.9 : 1 is pretty lean for nitrous. I wouldn't hesitate to fatten it up some.
Im not a nitrous guru but i thought anything from 11.2-11.8 is near ideal for A/F when running nitrouse and 12.4-12.8 for N/A, whicc would mean he is not far off.Plus i think the plugs are suppsoe to be gapped to .030 or .035 for ideal nitrous applications. Jsut my two pesos
Last edited by The Phantom; 12-01-2009 at 09:22 PM.
Do you have a fuel pressure gauge and if you do are you watching to see what the fuel pressure is doing.. Also what system do you have?. Sounds like maybe some fuel pump issues.? That thing should be super fat with the 33 jet.Assuming its a single nozzle kit.
Im using the Nitrous Outlet plate behind throttle body. It has the 2 seperate lines for N/F. I dont want to put the Torco unleaded 107 research octane in vehicles gas tank. So I did a old school set up. 1 gallon fuel cell up front with Holley blue pump and regulator. Fuel pressure is set with what ever jet Im using on fuel side and set anywhere from 5.5 to 6lbs. Bottle pressure around 900. I dont have a gauge to visually see pressure going down the track but I could set it up and watch pressure real easy next time out. I wouldn't think it was fuel delivery problem as after it makes the shift Im back down to the 10/11 to 1 ratio. On the motor I shift it at 5500 1-2 and 5800 at 2-3 shifts. This is where it ET the best of 13.60 at 104.5 with 2600 adjusted altitude. Now on N2o I left the shift points the same and it appears to noise over during the shift. As best as I can tell when it shifts it doesnt go over 6000 RPM. Also using a button to activate system as I like to control it that way. No timing retard and after the pass pulled a couple of plugs and looked fine. Timing mark on strap looked to be in a good location and fuel ring was not down as far as it problably should be. But I was trying to be conservative but not to conservative without burning motor up. Im not new to nitrous but new to it on a computer assisted car
Last edited by haywood1; 12-02-2009 at 10:08 AM. Reason: more
I actually use the Torco 107 unleaded but just 1 gallon at a time in the front tank. I can change fuel side jetting to a larger jet and see how the AFR changes. I wouldn't think it would matter what fuel pressure you had as long as it is constant with jet combo and AFR and plugs read good with jetting set up. This weekend I will make changes and let everyone know if it helps. Also I will see if I can get LM1 graph on thread.
I dont think you enough volume of fuel at only 6psi. I run a direct port system with a separate fuel system. The difference is Im running 8 fuel jets. One in each runner. Those jet recommendations are for 58psi of fuel pressure.
06 MSRT8 Mods: PWR 393 with Procharger F1A.
Installed by AfterHours Mopar Peformance.
Puede entender las palabras que provienen de mi teclado??
I went to the Nitrous calculator and found out a 46F jet would work @ 6lbs with 57 N. Im going to see how high the pump and regulator will go and then tune from that. I for sure was not discarding your input and meant no harm.
^ baxster you know I dont speak spanish
PWR 393, Twin 6262mm Turbos, SHR trans, Fore Fuel system, Wilson Hemi Sheet Metal Manifold
880 RWHP 775 RWT at 16 psi and 17* of timing
Tuned by Robert@ Ditos motors
Walk Softly And Carry Two Big A$$ Turbos!!!