Sniper kit not performing?

Hi, new to n2o and would appreciate any feedback. I have a mild 460 PI motor and C6 with 3.89 gears. 28 inch m and h drag radials stock convertor welded up. 1 Holley blue to a moroso log set at 7 lb, half inch line and return, I also have plumbed in a fuel safety switch to kill the n2o if not enough fuel is available. I leave the line at idle and shift @ 5300. Twin 2.5 inch with X pipe. Fastest run n/a 12.56 @ 109.4. Had 3 runs with 100 shot without much improvement? It feels like it bogs down off the line and takes half track to recover. I am using the recommended jets that came with the NOS sniper kit. I have a pic of time slips but not sure how to attach. Cheers from Aus.

If it not coming alive till half track sounds like you need a good converter stock converter will kill it off the line and not letting the RPMs until you get in the power band.

Thanks for the reply, what would you think is a reasonable time difference with a 100 and the 150 shot over na? I was thinking I should be looking at 11.80 at least with the 150 shot. The cam I'm running is a old crane # HIT 282 hyd. Min rpm 2500 with max 5500. Would you guys recommend a 2500 convertor?? because I thought N2O liked tight convertors and that's what confused me with the problem I'm having now? Is 7lbs fuel pressure going to make it to fat, it doesn't appear to be blowing any black smoke on launch. Cheers.

Ok sorry about the dumb questions but if someone on here could tell me with my kit what is the best fuel pressure to run? Any feedback much appreciated, I'll work the rest out with trial and error. Cheers Tim.

Is the dist. advance locked?

No 36 degrees total with 4 degrees retarded thru my msd 6al with 100 shot. Thanks.

A properly set-up distributor is a cheap fix. It sure won't hurt to lock it out.

IMO a 100 shot isn't really that much nitrous in the first place. A 100 shot usually isn't going to create a real big drop in ET, especially if the fuel tune is in the safe/fat range.

You say the stock convertor is "welded up", what are we talking about? Does this refer to the outer structure being rewelded/reinforced (like the mounting studs reinforced, or anti-ballooning plates added). Or something like the OEM sprag bearing being welded solid (aka a poor man's spragless converter)?

Thanks for the input guys, I'll be ordering a new convertor with more stall to suit my combo. I have been using the 100 shot for safety's sake, (probably worrying for nothing) with the aim of using the 150 to its full potential. Which brings me to my original question, what is the recommended fuel pressure? If I'm running 7lb is this making the tune excessively fat, as I realise they are factory fat any way or for these low horsepower systems am I expecting to much. I thought I would be able to actually tell when the system is operating because at the moment I honestly can't feel any difference. 100 shot = 2 tenths?

im sure a lot of us here would like to spit out exactly what you need.their are steps that needs to be done in order before anyone can run a nos tune and be safe  

I feel that you can go down 1/4 lb on the fuel psi at a time until you get the correct color on the plugs,not just A plug but reading them all in order 1-8 and take pictures we will try to help you.

you will need to run a new set of plugs each time until you get the correct reading or near the correct reading.it dosent have to be perfect for a low hp tune.also you will need not to have any or less as possible idle time on the plugs this will help in reading the plugs.

Thanks a lot for the info, that's just what I needed to confirm what I was thinking. Good onya.

There are many things that could be hurting your performance here and honestly the converter is NOT one of the things that comes to mind first. To add a 100-150 HP to about any converter should show a gain. We sell a bunch of our Saturday Night Special kits to guys like yourself and many see a 1 to 1.2 second gain on our 150 HP jetting.

Are you running a hobbs (low pressure) switch ?? The 7 PSI is to high as well. The tune ups they give with there instructions for that kit are terrible. Here's a link to better info that will help too..

http://inductionsolutions.com/forums/showthread.php?1418-Tune-ups-for-NOS-Big-Shot-and-Cheater-Plate-kit


This might help as well.. SJ

Thanks Steve, great info there. Yes I'm running a hobs low pressure switch. Is the pump set up ok, because if I wind the pressure down this affects the motor as well? I'm going to set up light linked to the power side of the gas kit and a fuel pressure gauge inside the car to see what's happening. Why would you think it's running the same times to half track as n/a, just as a matter of interest? Cheers Tim.

Have you had a chance to run and see if kits is staying on ?? Did you changes tunes as well ?? Thanks, SJ

G'day Steve, gave it a squirt with 55 n and 47 f jets, still seems to bog down on take off. Then tried it na and the same result?? Got home and checked plugs and they were BLACK. Also checked fuel pressure at fast idle while tripping nos micro switch and noticed pressure drop to around 5.Probably partly my fault as  these are the same plugs I run na and I had 3 nos runs at the track(last runs). Anyway going to try new plugs (ngk 6) na first if ok will change them for nos plugs ngk non projected 8s. By the way got a good deal on a magna fuel 300 so the blue will be getting the flick. What timing would think I should be starting with?
Thanks.

Sounds to me like one of the best things might be to spend a little time cleaning up the carby and getting it right. Squirt out all the air bleeds to make sure they are working, check float levels and main jets just to be sure, then make a few runs and get it right. Then once your close there the nitrous is next.. SJ

Carby should be spot on, I raced it on June 7 and 8 with around 25 quarter mile passes na with the motor running perfectly, plugs ended up looking spot on before running the Last 3 of the weekend with nos. Thanks for the interest, will keep you updated. I will be chasing my na tune up with new plugs first.

By the way Steve, is your web site down ATM? Having trouble seeing posts in the forum. 
Cheers.

XC460Coupe wrote:By the way Steve, is your web site down ATM? Having trouble seeing posts in the forum. 
Cheers.

Yes, we are having an issue with it as well as our service company. We are trying to resolve ASAP.. Sorry.. SJ

Well it's been a while and I thuoght I'd let you guys know how I've progressed since last time I raced the car. Only race the car once a year due to lack of tracks here and just back from our annual drag long weekend. New changes this year, 2700 convertor and 340 Aeromotive stealth pump now in the car, ran the 100 shot on NOS jetting and went 11.7 @ 115. 1.7 60 foot and got some air under the front wheel. Rigged up a light in the car to signal when the nos was triggered and was on the whole quarter. NA time 12.6 @ 108 so I'm spot on where I should be. So Cheers for all your input and I think it's safe to say I think we've got it sorted now.

congrats on a great pass !!! time to put some bigger pills in her !!!

XC460Coupe wrote:Well it's been a while and I thuoght I'd let you guys know how I've progressed since last time I raced the car. Only race the car once a year due to lack of tracks here and just back from our annual drag long weekend. New changes this year,  2700 convertor and 340 Aeromotive stealth pump now in the car, ran the 100 shot on NOS jetting and went 11.7 @ 115. 1.7 60 foot and got some air under the front wheel. Rigged up a light in the car to signal when the nos was triggered and was on the whole quarter. NA time 12.6 @ 108 so I'm spot on where I should be. So Cheers for all your input and I think it's safe to say I think we've got it sorted now.

Great to hear and great gains for a 100 shot. What all changes did you make to turn the program around ?? Thanks, and congrats.. SJ

Makes a big difference when you have the right pick up and pump to ensure it doesn't trip the safety switch. Convertor helped and ran the bottle on 950 psi. Plus have a great group of mates that bring there cars along. We send our cars on a semi that take seven cars then about 20 of us make our way over. It's about an 8 hour drive for us and 2 days of racing.