If there's no restriction on the intake side, can anyone explain a 15hp increase with the 75 shot of nitrous? We even tried a 100 shot and it was only another 15hp. I think we topped out at 478 with the 100shot. Exhaust is pacesetter longtubes with true 3" duals, no cats, dumping into 3 chamber flowmasters. Exhaust shouldn't be the culprit.

 

what kind of dyno? how much timing were you geting?

 

Something is off and it point's to the tune by process of elimination. You have the parts to be making mid-500hp. I make over 500 without the n2o at the wheel hubs (DynoPack) and the nitrous gives me an almost equal boost 50shot=50rwhp. You definately should be making more with the 75.

 

I think it was a dynopak dyno. I don't remember the timing #'s, but even if the timing was on the conservative side, wouldn't the hp#'s on the juice be more in line with nitrous used? I'm getting 1/5th of the hp increase that I ought to be getting from the nitrous.

 

how do you know there is no kr?

 

i was seeing -10deg of timing with my whipple at times. it would help us to help you if you had a log from your run that we could look at. something with timing, KR, iat's, maf.....

 

Maybe Allen can chime in here. I pretty sure he said there was no knock retard.

 

What was his opinion?

 

He thought the radix was maxed out. I agreed with that when considering the 448hp before the nitrous. I thought there was more in it, but maybe the air pump wasn't up to providing more air. With the nitrous, aren't you adding more oxygen via the nitrous? Even if the radix is maxed out, I would think adding nitrous and more fuel would add up to more than 15hp.

 

No KR, iat table never had to pull timing, and total timing at wot was about 20degs. We started at 17deg with the 75shot, then moved up. I still didn't see any KR at 22deg, but we weren't gaining much power so I stopped increasing it.

A/f ratio is dead on at 11.1 across the board.

It's a Superflow dyno.