Nitrous Dodge Viper

Noswizard · **Posted:** Thu Apr 15, 2010 7:08 pm

Make sure the injectors are higher than ANY part of the pipe work.

Remember that such high flow Pulsoids are NOT fitted with filters, so ENSURE that you filter the nitrous extremely well when filling the bottles.

1quickchevy2 · **Posted:** Fri Apr 16, 2010 6:05 am

Noswizard wrote:

Make sure the injectors are higher than ANY part of the pipe work.
Ill make sure this is the case, I think we have to lower the yblocks a bit to obtain this. Is this just to prevent fuel from pouring in after the solenoids are off, and there\s no nitrous to atomize it?? I can imgine it'd leave a lil puddle in the intake :shock:

Remember that such high flow Pulsoids are NOT fitted with filters, so ENSURE that you filter the nitrous extremely well when filling the bottles.

Sounds good. We're only going to do initial testing with the 50 shot. That fuel jet is tinyon the 2:1 ratio. We will get the bigger jets in and dial the percentage back on the max as needed to lessen the chance of getting something in the fuel jet

Noswizard · **Posted:** Fri Apr 16, 2010 10:51 am

1quickchevy2 wrote:

Ill make sure this is the case, I think we have to lower the yblocks a bit to obtain this. Is this just to prevent fuel from pouring in after the solenoids are off, and there\s no nitrous to atomize it?? I can imgine it'd leave a lil puddle in the intake :shock
No that shouldn't be a problem, its to ensure even distribution of the fuel, because with one pipe higher than the other and above the injection point, the fuel will be more inclined to flow through the lower pipe/injector rather than evenly.

Sounds good. We're only going to do initial testing with the 50 shot. That fuel jet is tinyon the 2:1 ratio. We will get the bigger jets in and dial the percentage back on the max as needed to lessen the chance of getting something in the fuel jet
I wouldn't worry about fuel jets getting blocked, as fuel injection systems have extremely fine filters and we've never heard of it happening before and I'd also use the jets as much as possible for optimising the mixture, as the Max fuel trim is only intended for extremely fine adjustment.

1quickchevy2 · **Posted:** Sun Sep 05, 2010 11:50 pm

Hey Trev,

Finally got the viper to the track with the kit on it. The 2:1 jetting seems to be super fat esspecially when pulsing off the get go. The car ran its best ever mph 117, but on its worst ever et 13.2sec.... It bogged real hard... puffing black... second gear it would start clearing up, and finally take off in third. We cut a couple plugs after and they have a black fuel ring 1/4" wide at the base of the porcelen. Also fuel deposists on the top of the threads around the strap. According to calculations The 2:1 jet ratio with 900psi bottle pressure and 55psi fuel pressure.. the nitrous to fuel ratio is 3.08 to 1 according to one of my calculators..... shouldn't the tune up be closer to 5 or 6 to 1 nitrous to fuel ratio?? I know the base tune up on my spider is around 6 to 1, and it dyno'd rich. Additional info on the viper runs... 114octane fuel, -8 ngk plugs.

Noswizard · **Posted:** Mon Sep 06, 2010 3:07 am

Glad you managed to see an improvement in the mph but I've never known an overly rich mixture (on nitrous) cause a bog and the reverse is normally the case.

2 : 1 is DEFINITELY a safe ratio even with fuel pressures of 30 ish psi which is what it's 'assumed' most fuel injected cars run on (even though some run higher as the Viper does) and the way forward is to lean it out using the plug checks as your guide.

It's all well and good using theoretical calculations but as every car has the potential to be different it's much safer to start from where you are now and use the plugs rather than theoretical ratios.

The richness when pulsing is again due to safe settings that benefit from being tuned to your particular application and in this case it's the fuel seat position adjustment (the nitrous will also benefit from being optimised) and if you follow this thread you'll see some independent results of the benefits the adjustment offers;

viewtopic.php?f=5&t=5456

1quickchevy2 · **Posted:** Mon Sep 06, 2010 5:15 am

OK thanks trev, its just dawned on me, I should have checked the nitrous delay. Maybe its comming on too late. Whats a good starting point in milliseconds??? I also never preformed a static test, because i couldn't remember how to set up the controler ramp rate for the test... could you post me a link to the static test proceedure please!? thanks wizard

Noswizard · **Posted:** Mon Sep 06, 2010 12:50 pm

1quickchevy2 wrote:

OK thanks trev, its just dawned on me, I should have checked the nitrous delay. Maybe its comming on too late.
Well that would explain it but there are a number of other possibilities. If you run through the Max settings and list them for me I'll check to see if any are inappropriately set and could cause the bog.

Whats a good starting point in milliseconds???
Unfortunately that depends on the length and number of pipes but the factory default setting is as good a place to start as any and faling that something in the 200 millisecond region.

I also never preformed a static test, because i couldn't remember how to set up the controler ramp rate for the test... could you post me a link to the static test proceedure please!?
Here's the link to the static test but if you mean the Max set up and using the Max static test feature, I've just revised the Max extreme manual and added a flow chart for easy access to all the features, so if you drop me an email I'll send you a copy.

1quickchevy2 · **Posted:** Mon Sep 06, 2010 10:31 pm

No link in your post??

Noswizard · **Posted:** Mon Sep 06, 2010 11:58 pm

1quickchevy2 wrote:

No link in your post??

Blast it!!!! :redface:

viewtopic.php?f=7&t=466

1quickchevy2 · **Posted:** Tue Sep 07, 2010 12:57 am

haha thanks trev

1quickchevy2 · **Posted:** Mon Oct 04, 2010 3:23 pm

Had the cars out to the track, and with the new tune up got it down to 11.21@125mph! On the won 300 (150hp) jet. Previous best on motor wa 12.4X@ 117mph. My buddy finnally seen the potential of the kit and wants more power! ahahah After he gets an upgraded fuel system and possibly exhaust. The car is all factory besides an upgraded clutch, and some 335/35/r18 micky street radials. Thanks for the nice kit!

culasse · **Posted:** Mon Oct 04, 2010 5:17 pm

Congrats Justin. That`s quite an improvement. You shaved more than a second off your personal best.
Is that the limit on your nitrous system or can you squeeze out even more?

1quickchevy2 · **Posted:** Mon Oct 04, 2010 8:07 pm

Thanks Culasse, Its not my car though. I have the 67 Pontiac. I also ran a personal best of 10.88 this weekend though. The Viper's my best buddy who I got the kit for, and helped him set up. We both feel there is more in the kit, but we'd like to get an upgraded stand alone style ecu to control ignition timing, and well as an upgraded fuel system. The kit ran flawlessly, we just had to change bottles!!! the car just kept getting quicker. started with an 11.7 then 11.5 then 11.3 then 11.5 (ran out of nitrous at half track) fresh bottle, aggressive ramps with the max, led to the final 11.21 pass. His best mph before nitrous was 114mph, and got it to 125mph now. I'm not sure how much more the 4mm line is good for, but we might be able to squeeze a 200shot out of it.

Noswizard · **Posted:** Mon Oct 04, 2010 8:48 pm

It sounds like you've both been doing very well and been having a great time while you were at it.

Very pleased to hear that both systems (especially the Spider) is performing as intended.

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