NXL AFR woes
11-19-2008, 06:09 PM
#21
Ray just pointed out to me you have the actual NX intake with the discharges made in. This entire time I did not look at the pic well enough to notice that. I was thinking you had the under the injector nozzles.
I guess you can not trade that in as easy.lol
Dave
I guess you can not trade that in as easy.lol
Dave
What I want to know is, after the consumption test, assuming everything looks good (which I honestly believe it will), what happens next? Are we stuck with some non-functional product? I tried digging here the week he bought it before hand, but it was a week where the search would not return anything.
11-19-2008, 09:50 PM
#22
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I am running the under injector style NXL system. I have tuned the car with 120 and 180 shot if nitrous, 180 being 26N and 14F. I am also running an accumulator with only a single Walbro 255lph pump, pushing my Vette to over 600 rwhp. On both shots, the AFR was 12.7-12.8 NA and on nitrous it went to 11.6-11.8 AFR. I guess I am just lucky?? No problems here and am happy with how it performs. The only thing I have different on my kit is that instead of the black lines running from the rails to the nozzles, I have -3 stainless steel braided lines. Like I said no problems at all.
11-20-2008, 01:29 PM
#28
Well we didn't put it there; that's where it is, and the car needs both the injectors and pumps that it currently has so....
We will do the consumption test, though I can say, after tuning on many a small-shot car, I am relatively certain that the nitrous side is unimpeded. The car shifts at 6800 off the spray and when he hit it at about 5500, it pushed through the gear change and into the limiter going into second gear. The 4l60 is gonna come out of the car, we are just waiting for it to go on it's own. It's stock and has many many 10 and 11 second passes on it. I guess it's 'good' one.
What I want to know is, after the consumption test, assuming everything looks good (which I honestly believe it will), what happens next? Are we stuck with some non-functional product? I tried digging here the week he bought it before hand, but it was a week where the search would not return anything.
We will do the consumption test, though I can say, after tuning on many a small-shot car, I am relatively certain that the nitrous side is unimpeded. The car shifts at 6800 off the spray and when he hit it at about 5500, it pushed through the gear change and into the limiter going into second gear. The 4l60 is gonna come out of the car, we are just waiting for it to go on it's own. It's stock and has many many 10 and 11 second passes on it. I guess it's 'good' one.
What I want to know is, after the consumption test, assuming everything looks good (which I honestly believe it will), what happens next? Are we stuck with some non-functional product? I tried digging here the week he bought it before hand, but it was a week where the search would not return anything.
1. Flow restriction on the nitrous side.
2. Wiring issue causting the nitrous solenoids not to fuction properly.
3. Nitrous discharge pulling vacumme on injector.
If the first two check out I would suggest I would contact NX and see if you can do an exchange with them. Talk to Craig or Abney.
Dave
11-20-2008, 04:50 PM
#31
AFAIK he used 42lb injectors... He was spraying 250. His fuel setup was a single walbro running the motor and the gas. Maybe it was OK with the accumulator but I didn't feel comfortable with that on this car. We tried out the 80-hit when the car only had 1 pump but was still running the front mount regulator. Fuel pressure fell into the high 30s low 40s and the AFR went lean the only time that we tested it. In went the second pump, and now we can't get rid of the fuel. The 80 hit came in and felt like about a 100 hit to be honest but we let right out of it. That experience combined with the car pushing through the first gear limiter when we tried it on the 120-hit (2 pumps and rich) really tells me that the nitrous side is working fine, but the consumption test is on the board for the weekend never the less.
12-03-2008, 10:10 PM
#33
Not good....
I have one other suggestion to check that may sound off the wall..
Check the logs and see if the computer is telling the car to dump the fuel when the nitrous hits. As weird as thios sounds we have seen the computer do this from picking up the coldness of the nitrous.. Just a wild chance..
Odds are its the intake design...
Dave
I have one other suggestion to check that may sound off the wall..
Check the logs and see if the computer is telling the car to dump the fuel when the nitrous hits. As weird as thios sounds we have seen the computer do this from picking up the coldness of the nitrous.. Just a wild chance..
Odds are its the intake design...
Dave
12-05-2008, 01:03 PM
#35
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yep this was my old setup i sold to his customer. the pic he used is the one i took. i used 42# injectors, racetronix hot wire kit, the NX accumulator and single walbro intank. with my original 408 setup i made 663 rwhp on the 250 jets (225 rwhp). here's that dyno sheet. you'll see i never went below 12:1 ratio. i remember talking with ricky at NX when i bought it. to change the fuel routing there was some certain way of hooking things up. maybe see if you can find him.
tires spun on the dyno, hence the weird line at the beginning.
motorr run for comparison
tires spun on the dyno, hence the weird line at the beginning.
motorr run for comparison
Last edited by mrr23; 12-05-2008 at 01:21 PM.
