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Old 12-05-2011, 05:40 PM   #21
TRUEBLUE3934
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I would suggest making 1 or 2 passes without nitrous and then a couple with it for comparison on trap speeds. A 100 shot should pick you up a decent gain in trap speed. About a 100rwhp gain picked up my trap by 8-9mph.

Is it a wet or dry kit?
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Last edited by TRUEBLUE3934; 12-05-2011 at 05:42 PM.
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Old 12-06-2011, 08:02 AM   #22
djd2392
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It's a wet kit

My goal for the day was to hit 13s, which i did pretty easily haha, and the car is still a work in progress, so ill keep you guys updated
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Old 12-06-2011, 05:32 PM   #23
TRUEBLUE3934
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OK. A wet kit. That is good.
What size fuel jet are you running and what size nitrous jet are you running?

Do you have any way to monitor the A/F ratio?
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HiTech stageII cams, BBK Ceramic LongTubes, MAC ProChamber, Flowmaster50series, SteedaUDP, JLT CAI, MGW, SVT Focus Fuel Pump, H&R Race springs, Bilstein HD, MM CC Plates, MM FLSFC, Eibach Swaybars, MM LCA, MM Pan-hard, 3.91gears, AuburnPro diff, Moser31splines, 17x9 & 17x10.5 Bullitts, Dark smoked headlights w/ 55W HID, chin spoiler. 283rwhp/298torque (motor), 417rwhp/498torque (latest nitrous tune) 12.5@110.5mph (motor w/ 1.77 60'), 11.66@120.9mph (1.78 60')on nitrous.
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Old 12-07-2011, 08:36 AM   #24
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Also if it matters, i didnt purge when i got up to the line, it just completely slipped my mind for some reason.

As for the fuel and nitrous jets..let me check when i get home, cause i honestly cnt think of it off the to of my head haha
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Old 12-07-2011, 04:40 PM   #25
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Not purging it will make it hit softer when it activates. There is likely to be a brief lag and a rich spike if the nitrous has not been purged. I still have not added a purge kit to my set-up, but it will be done before next spring.

I'd be very interested to know what size each of the jets are. I assume that you have not had a custom tune made for the nitrous usage?! Do you have a nitrous pressure gauge in the system and a bottle warmer? The bottle pressure is important as well.
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Old 12-07-2011, 07:20 PM   #26
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I do have a custom tune for the nitrous, I do not have a pressure gauge, or bottle warmer though, i am getting both though

as for the jets though: .046 nitrous / .030 fuel
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Old 12-07-2011, 09:50 PM   #27
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Bottle pressure is an important aspect of nitrous systems. Ideally, you want to target between 950-1000psi. Significantly more or less can have noticeable results.

The .046 and .030 jets in my car would be rich. A little rich is safer than a little lean, but the .046 nitrous jet goes perfect with a .028 fuel jet in my car. I am not suggesting that you should make that change if you had your car tuned with those jets.

However, I can say that the .046 nitrous & .028 fuel only gained me 60rwhp. That helps me understand the traps a little better, since I was basing my conclusions on a 100rwhp gain. Note that some nitrous kits rate their HP at the flywheel, not at the rear wheels. ZEX is one of them.

If you want better results at the track, do add a pressure gauge, a bottle heater, and a purge kit. You will get MUCH more consistent results from your nitrous that way.

Good luck and let us know how it goes next time out!!!
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Old 12-08-2011, 08:08 AM   #28
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Yeah i have a purge..im going to be getting a pressure gauge and bottle heater...

I really appreciate your help man!, I also just invested in nittos for the track. So I think im gonna be able to get better times next season
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Old 12-08-2011, 09:17 PM   #29
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Another addition to the nitrous system that I would suggest if you can afford to get it is a window switch. It would allow you to set a minimum activation rpm (nitrous wouldn't activate unless rpm are above the set minimum) and a max rpm (nitrous deactivates when rpm reach the set maximum). The max is WAY more critical since you definitely DON'T want to hit your rev limiter with nitrous activated. Serious damage can occur in an instant like that.

You will love the DRs! They will help you lower your ETs by quite a bit. You have to REALLY heat up the Nittos to get them sticky though.
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Old 12-08-2011, 11:15 PM   #30
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Quote:
Originally Posted by TRUEBLUE3934 View Post
Unless he spun his tires a long way down the track (I hope he would have pedaled it a bit before doing that), he wouldn't have lost 5,6,7 mph in 1/4 trap speed. Without more information, I still cling to the idea that he is missing a fair amount of the power his 100 shot should produce.

Pi or not, the 100 shot should be getting him much better traps. My car with only 3.73 gears, 240rwhp, and a pair of very old and dry factory original street tires was trapping 81.5-82mph in the 1/8 and 101.5-102 in the 1/4. I just can't see a 1/4 trap below 106mph with a 100 shot.

On motor alone (283rwhp) I trap 108mph (at our local slow track) to as much as 112mph (at our fast track). I would expect the 100 shot to get him to at least 275rwhp.

Trap speed is mostly about power to weight ratio.

I'm hoping to be able to help him out a little, but need some more details to see if I can...
Good point on the trap speed, he did run a smooth run so you might be right about the tune. Orrr see below...

Quote:
Originally Posted by djd2392 View Post
I do have a custom tune for the nitrous, I do not have a pressure gauge, or bottle warmer though, i am getting both though

as for the jets though: .046 nitrous / .030 fuel
Bottle pressure was down because it was cooler out, get a bottle heater. You were probably only spraying a 50-75 shot. I bet this is the problem.
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Old 12-08-2011, 11:15 PM
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