calongo_SS

iTrader: (7)

Just wondering how much of a difference you guys have seen on your NA times when going from an NA tune to a N2O tune. I just went to the track for the first time since the retune and I ran 4 tenths slower and I lost 3 mph in the 1/4 mile on motor. Just wondering if this is normal or if my new tune is way on the conservitave side. I went from 27 deg timing for NA to 22 down low and 24 up top for a 150 wet shot on 93 octane. My a/f on motor is about 12.8:1.
Doesn't seem to me like a should have lost more than 1/10 and 1 mph with just those changes. Oh yeah the car only lost about 10 peak hp, but I don't know about how much it lost lower in the rpm range.
Let me know what you think please.

Robert56

iTrader: (2)

There are so many variables to consider, on comparing past runs to current runs, no doubt you lost some, but it may not be as bad as you think. I also think you are tuned consrvative. My n2o tune, I ran my best n/a run to date, both in my sig. Did you you need to pull that timing or was this one of those, I guess we will pull x-amount of timing for x-amount of n2o, that's guess tuning in my opinion. What's your a/f on the spray?
Robert

calongo_SS

iTrader: (7)

I didn't do the tuning myself, but I'm assuming he just pulled x amount of timing for the jets I told him were in the car. The a/f on spray is a whole other topic, I've never been able to pick up more than 70 hp on the dyno (150 jets). There is something wrong somewhere in the kit (bought used). I only picked up .5 sec and 7 mph on a 150 shot. I've got it narrowed down to the main feed line or the bottle though. But I've seen the a/f vary from 10.5 - 11.3 on the bottle.

I do realize there are a lot of variables comparing one run to another months apart w/o knowing DA. But the air did feel really good on this last trip to the track.

gator's 99TA

iTrader: (2)

my n/a tune is barely leaner than my wet kit nitrous tune. the only differnece being how i jetted teh fuel side. the program is no different. i dont think you need to be at this level.

calongo_SS

iTrader: (7)

My original NA tune a/f was 13:1, so going to 12.8:1 doesn't seem like to big of a change to me. Do you think he just pulled out way too much timing? I figured 25 deg was where it would be, but I told him to be a little on the safe side because I don't have anyway to scan the car, or adjust the tune myself.
This is a cam only car also BTW.

2 Stroke Racer

iTrader: (11)

I run A timing tuner, I can run advanced timing N/A then when I spray it automatically retard's as much as I want. Not that expensive, and easy to install.

Matt@HSW

iTrader: (14)

Like Robert56 said it really comes down to the car. If you're pulling timing via the tune and using that N20 tune NA you could see a pretty good difference, I've seen around 15 RWHP.

Matt

red fury

iTrader: (1)

your a/f on nitrous is "very safe". Maybe if the a/f was leaned out to 12.0:1-12.5:1 you would see more power. My a/f ratio is just a tad richer on the spray compared to my a/f on motor.

330racing

iTrader: (11)

red fury...
if he is currently at 12.8:1....going to 12.0-12.5 would not be leaning it out, but richening it up I think.

calongo_SS

iTrader: (7)

I think he's talking about my a/f on spray, which is pretty fat. I'm think I'm having nitrous delivery problem, that's why it's rich and I'm missing some hp on spray. The kit is coming off the car today and going to the manufacturer to be checked out, trans is coming out to have the converter checked out, and the ECU will probably be sent to the tuner to add some timing down low. Looking at some old time slips, I lost .1 in the 60 ft, and by the 1/8th I'm .4 off and 3 mph down and stay that way to the 1/4. Hopefully most of my losses have been because of the 22 deg timing down low.