My frustration is now being to occur. I dynoed a 150 shot and put down 160 to the wheels with my six speed. I swapped my tranny for a turbo 400 with a 3800 stall. Next time at the dyno kept my a/f at about 11.9. This time I jetted it for 150 then a 200. The 150 put 120 to the wheels, the 200 shot put only 130 down. My plugs are NGK-R gapped at .030. Timing was at 33 degrees wot and I was running 114 leaded gas both times. I don't think it is the converter because I am still gaining plenty of speed for the time, for example I am not stuck at 120 for 2 seconds on the dyno. Or is it just the fact that I swapped to a non-lockup th400 and it is a power robber? I keep my bottle pressure pretty consitant at around 950-1050 with the bottle heater. Any ideas, thanks guys?

 

I think you got it right and answered your own question. I think it's the converter and turbo 400. I used to run a manual shift 400 behind a 454 and they are a brutish tranny.
Robert

 

I don't worry about dyno numbers as a means of measuring real power - the track mph will be the best tool for that. I agree with Robert and your assesment of the parasitic loss.

You say both times on the 114 but I'm not sure if you mean for the 6 speed and T400 or the latest two shots of 150 and 200. To me, that's an awful lot of octane for that size shot, but that's just me.

Back to the subject, I'd really focus on why the 200 shot didn't gain more than 10hp. Something doesn't add up there.

 

next, I am running that high of an octane because I ru an aggressive time(34degrees at wot)also, the 114 was with the six speed and th400. It was very humind that day, wouldn't the humidity have a pretty large affect with nitrous?

 

No doubt you are going to lose some power going to the 400...but the 200 shot should defintely make more than 10hp over the 150....Sounds like a nitrous supply problem to me. Is the N2O filter clear?

 

I have no idea, where in line would the filter be? close to the solenoid?

 

also, have often should the filters be changed, every 50 bottles of nitrous? I know that the place that fills my fills filters it before it goes in my bottle

 

hmm you will deffintly loose some going to the tanny you did.But the gains will show on the track. You should have still gained more on the 200 shot. Was your bottle low or full? Do you have any knock rertard? Were you reading your plugs? What plugs are they? Did you try adding a larger nitrous pill? If so did it make any gains or did it stay the same. do you have a bunch of connections in the main feed line?


Did you try pulling some more timming and seeing if it gained any.

I suggest always looking at the filter here and there.The big bottles companys use get rust falkes in there from time to time. If they are not using a good filter it will go into your bottle.

There is something not right..Feel free to call me if you would like to get a fresh mind to talk with.
Dave

 

That's good that they filter while filling. However, contaminates can come from your bottle, your lines and your fittings. I remember one guy got his so plugged it wouldn't work, finally the problem was found to be his large white bottle nut washer. From over tightening, pieces were coming off and clogging system.
Robert

 

I use TNTs filter that never needs to be changed only cleaned. To clean it you simply take it loose from the supply line end hook it up backwards to the bottle out of the car of course, and blow it free of debris by popping the bottle valve. That is my method though, do it at your own risk.

Do you have a filter? It sounds like you may not? If you dont there could be some rust and other debris restricting flow somewhere in the system....

 

so would the filter be right before the nitrous solenoid?

 

The filter I use comes directly after the bottle...The main feedline then attaches to the filter...If you do not know where it is odds are ya dont have one. Ive heard NX also has a screen on the inlet side of the nitrous noid, but your going to have to ask Dave about that one...

 

Yeah, should definately put more than 10 hp over the 150, and should definately put more than 130 to the wheels, something isn't right!

Turbo 400 shouldn't kill it that much, I put down 220 thru a turbo 400 on a 200 shot wet kit.