got a nirtous question

[Himura-Kenshin]

got some problems...just trying too see if anyone see or heard of similar problems....at 15 psi my motor will take, what i have tried from a 25 to 100 shot wet......and be fine...but anyting over 15 psi..it doesnt matter what kinda shot it is...the motor wont take it...just pops and backfires.....
i have and can run 25 psi without any detonation problems..and spikes between 25-30 psi..but no more, have run it like this for some time now....

with that being said...i have an upgrade turbo...66 inlet and td-04 exhuast...stock head/valve train except for ranger roller cam and roller followers...upgraded bigger front mount..modded intake so intake doesnt go over the top of the motor...but it on the side...larger T.B., 3 inch exhuast all the way back 2 fuel pumps for the much needed extra gas....i dont think im leaving anything out....

anybody got any ideas??? of why this might be causes?..i know i dont know everything...thats why im trying too get some help.....thanks

[svobud]

how is/are the line(s) plumbed? did you just make a one hole inlet just prior to the TB or a plate at the TB? The natural design of the intakes will cause a load up on the #1 cyl - or maybe it was #4.

Huber was explaining that one to me back in 99' ... and they went with an intake that has a 4 line set up - one line into 4 .. and each one of those get plumbed into each runner - plumbed at the base of the upper intake. Gasich is using his old intakes now .. set up the same way. I'm not sure of his boost levels .. but he's shooting a 90hp shot - wet.

Just my .02 .. as I've never used N2O on a 2.3T motor.

[Himura-Kenshin]

its plumbed a few inches before the TB about 6.....im using the stock lower intake and a custom top....one large top to flow flush with the stock lower....to move the TB to the front of the car, and i smooth out the lower intake to make the transitions good

[SVOeric]

well -- I'll throw in my nearly worthless .02 (as I don't have any experience with nos either)

one thing that come to mind --

sounds like you are blowing out your flame --
in other words, you don't have enough ignition to light off the air/fuel. try gapping your plugs closer -- see if that helps.

[Himura-Kenshin]

oh yea that reminds me...i have a msd 6al and a msd boost retard..and a mallory coil....forgot about those.....u sitll think i might be blowing out my flame?....that might work...how much closer do u think?

[SVOeric]

to be honest -- those don't seem to be a lot "stouter" that the stock ignition systems..

What are you gapping your plugs at?

[U S Marine]

Are you still using the stock computer? How are you going about getting a richer mixture above 15 PSI? You have to figure with 15+ PSI and more oxygen (NOS) you need quite a bit of fuel. Sounds to me like you are going lean.

[svobud]

you also might consider knocking some timing out when you're spraying it.

[U S Marine]

VERY true. I can't remember how many degrees to retard per 10HP of nitrous. There is a formula though. If your running NOS, I'm sure you know that already.

[slovanova]

Originally posted by svobud
you also might consider knocking some timing out when you're spraying it.

That is very true. I forgot to back my timing down the other night and ended up blowing the head gasket. I was spraying a 50 shot.

Himura-Kenshin, what plugs are you running? I would at least try gapping the plugs different and seeing if that helps.

[kiwi]

Spray?

More of a "launch" use for high traction without the lag.....If your trying to run it on the fly, better hit the dyno with an A/F to see exactly what is going on.......
I'm not sURE about a lot of boost on top of the NOS (a lot of psi on that piston top)~Engine/TURBO should be doing all the work.....

[BoostedSVO]

Run a MSD timing retard. You should be retarding the timing 2 degrees for every 50 hp of NOS you are spraying. Also it probably wouldn't hurt you to go a step colder on the spark plugs and gap them to .038

I run a 150 shot on my 331 stroker in my race car with no issues. I know the 2.3 is a bit different but I have used and installed NOS quite a few times.....Mike>>>

[Himura-Kenshin]

i running a step colder plug and .032 on the gap

[SVOeric]

humm -- I half expected to hear you were running .60 gap..

I don't think blowing your flame out is your problem then.


I'm out of ideas