99' SS - NX directport, few ?'s about jetting and a/f
11-14-2005, 12:52 AM
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99' SS - NX directport, few ?'s about jetting and a/f i got my NX dp kit from dave, i jetted it for the 200 shot, 26 n2o & 16 fuel jets. i knew it was pretty rich(safe), but i got it dynoed friday at JMS and the guy let off the kit at 5700rpms because it was so rich. it turns out that my a/f ratio was like 8-9:1, bottle pressure was 1000psi. running n/a it made peak power at 6500(at which i said to shut it down, it was steadily pulling up. TSP MSv3 cam). on the spray it only picked up 104hp, (running through a th350 and custom art carr 3400 stall) after talking to several people i put 12 jets in the fuel today, and it seems to run a lot better. i was told it should pick my hp up a lot and possibly 3-4 1/10's in the 1/8th. i have ran it just as it was several times, and it runs dead on 6.86's @ 101 1/8th mile, and a best of 6.79 @ 102.2 even running that rich.
any opinions and help appreciated.
my ? is has anyone dynoed their similar kit on an LSx car that made around 200 extra hp? also what was the jetting for it?
any opinions and help appreciated.
my ? is has anyone dynoed their similar kit on an LSx car that made around 200 extra hp? also what was the jetting for it?
11-14-2005, 01:46 AM
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i did my NX kit with the exact jetting you stated and got 215 or so rwhp. I had a stand alone fuel system and set it for exactly what the jet chart stated...which was 40 psi I believe. If you are running LS1 pressure of say 58-60 psi you will be quite rich. Youll just have to jet accordingly to get Af where you want it if you are runnng that high of pressure. A stand alone fuel sytem is another option...you can set the fuel presure where you want.
11-14-2005, 01:57 AM
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thats weird because the NX jet chart says for fuel pressure of 55psi.
i am also going through a th350 and stall converter. thanks for the info too!
i am also going through a th350 and stall converter. thanks for the info too!
11-14-2005, 09:47 AM
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jamnut, its a true DP setup. 16 SS lines and 8 pirana nozzles.
dave, i didn't change them on the dyno because i didn't have them there and it was late when i got it dynoed, everyone was wanting to go home. i have been keeping an eye on my a/f and it seems to be ok.
dave, i didn't change them on the dyno because i didn't have them there and it was late when i got it dynoed, everyone was wanting to go home. i have been keeping an eye on my a/f and it seems to be ok.
