Re: Hypothetically ???

4thHorseman on October 28th 2009, 7:34 pm

Really?

All the NOS jetting charts which I begin tuning with for the plate kits are bigger on the fuel jet at 5.5psi. I realize they are fat for safety reasons and I usually end up dropping the fuel jet a few sizes and get a nice looking plug. Never tried evening them out or going smaller than the nos jet with the fuel one on the plate. I will have to test this out. Carefully... study

studly on October 28th 2009, 8:28 pm

I learned by spending money do not run the nos tunes or the motor rich, most failures are caused by lifted ringlands in nos motors( i lifted 8 ) this is due to fuel getting by the rings then igniting the leaner(more fuel you can burn) the less chance of this happening. I run an 8 jet spread 8 more nos than fuel and have not hurt any parts this year and won the 5.95 championship for King of the streets.org. I read alot on Steves forum on YB and Monte Smith after trashing 8 pistons and so far i have had good luck. the main thing is pull timing read plugs and keep adjusting until you have your specific tune for your motor. when you pull a plug in my motor at the end of a pass it looks like new.

4thHorseman on October 28th 2009, 9:55 pm

My interest was peaked earlier about your comment.

I've been on YB on the nitrous forum for about an hour now and I am enlightened. sunny

I was pretty happy with my run on an 85n/91f tune using a progressive. The more I read the more I realize how jacked up that factory-type tune is. Ha!

At 6psi fuel pressure, how does something like an 85n/78f tune up sound for a 225hp progressive hit?

bruno on October 29th 2009, 8:05 am

4thHorseman wrote:"here is the 2nd pass with the plate 73/63 @ 5.5 @ 25*"
Don't want to hijack. Just interested in clarification. That's a 73N/63F jet setup in your NBS plate for your 1st stage? If so, I must be running my tune fatter than I expected. ???

I have it backwards right?

I'm running 85N/91F @ 6.5psi 28 degrees timing and ramping it in from 55% to full over a 1.5 seconds spread.
Shaving a second and adding 12mph to my na 1/4 et.

I'm running corrected 9.6@141mph with that tune on my junk.

yes that is correct ........... you need to call Steve and run your combo over with him and he can get you a baseline tune .....always ck your plugs Wink

studly on October 29th 2009, 9:22 am

i think a true 225 hit will probbaly be a 91 nos jet and 85 fuel jet at about 5.5, but bruno is right call Steve he have been doing this stuff alot longer than most, i am getting ready to send my victor 460 intake for a fogger install, the speedtech plate i have is alright but a fogger is the good mojo.

bruno on September 8th 2010, 5:59 am

4thHorseman wrote:My interest was peaked earlier about your comment.

I've been on YB on the nitrous forum for about an hour now and I am enlightened.

I was pretty happy with my run on an 85n/91f tune using a progressive. The more I read the more I realize how jacked up that factory-type tune is. Ha!

At 6psi fuel pressure, how does something like an 85n/78f tune up sound for a 225hp progressive hit?

any updates with your car??