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Old 09-01-2010, 06:18 AM
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Nitrous Power Shot Help

I'm running my Vette this weekend and want to install my Nitrous Power Shot system over to this car BUT I want tone it down to a 75hp shot.. The Power Shot system, as you may know, is a fixed 125hp system (no jets) and according to the tech at Jegs, I had to buy new fittings for the plate so I can install jets, which I did.. HOWEVER, after getting the plate fittings the jets wouldnt fit so I contacted the same tech again and he said "oops, you also need the new hard lines that go from the new fittings to the solenoids BUT we dont stock both of them" part# 16861 & 16860 and I cant find anyone else that does either.. I found some soft lines but then my solenoids wont have a solid mount.. Are there any alternatives? I just want to make sure if I have to order other parts that I get everything I need because I am down to the deadline now and will probably have to order everything 2-day air...

Thanks!!

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Old 09-01-2010, 03:20 PM
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You can get various different brackets that mount to the carb studs for the solenods to bolt to, if you want to use flex lines. The brackets attach to the two small holes on the bottom of the solenoid bases. There are individual brackets for a solenoid, to attach to a single carb mounting stud, and there are brackets that hold both solenoids and attach to a pair of carb studs.

Jegs, Summit, NOS, Nitrous Works, Nitrous Express, Nitrous Supply, Inducton Solutions, etc. Can supply either brackets, or line kits.
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Old 09-01-2010, 04:57 PM
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Quote:
Originally Posted by F-BIRD'88
You would need to swap the plate for one from a "Superpower shot" or "cheater" system. The plate you have is not the same.
You would esentually have a superpower shot system, when done.

Why do you want to step down the power level?
I'm basically running a stock rotating assembly and worried its to much.. However it is all brand new.. My plans were to start out at 75hp and then bump up 25hp at a time from there to make sure it stays together.. Everything else besides the rotating assembly is high performance such as aluminum heads, big cam (.250 @ .050), RPM intake, BG 750dp, accell/mallory ignition..

Should I just run the whole 125hp shot and just detune (run less timing)? I'm locked out right now at 38 and was thinking I could drop down to 34 and run the whole shot? My plans would be to come off the line and then start shooting it about 80ft out because it already launches pretty hard without anything right now..
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Old 09-01-2010, 08:17 PM
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What plugs are you running, how much fuel pressure do you have, Whats the compression ratio? How many feet above sea level are you? What is all specs on camshaft? All these things will determine how the nitrous will effect the motor. I have seen motors live for 5 years on a 125 shot, then again i have seen parts scattered everywhere on the first pass. and you can pull more timing out of the motor than 4 degrees for safety issues. If the motor has been run and the harmonic balancer has twisted you can get a false reading on timing.
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Old 09-02-2010, 02:18 AM
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F-Bird is correct on all of this.

The Powershot plate has fewer and different size holes than the Super Powershot/Cheater/Sniper plate does. Stock Powershot has no jets, and the plate's spraybar holes are sized for the correct fuel amount and nitrous amount to make 125 hp. No telling what MAY happen with your jerry-rigged set-up but you are on your own there. May work fine due to the fact you are reducing what is fed to the plate with jets but I would definately want confirmation from NOS that this has a acceptable chance of working.

If the engine smokes, AT ALL, don't even attempt to spray it. Oil and nitrous turns into a cutting torch when mixed together. Motor has to have good ring seal and be well tuned - NO PCV valve allowed.

The stock 125 powershot is pretty foolproof and safe, even stock cast piston SBC's will handle it with no problem if in good shape. I'd pull at least 4 timing and run 98 or better octane if you have no nitrous experience. More octane gives an even bigger cushion.

Rushing things just for one fun day will have a good chance of spoiling the engine.
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Old 09-02-2010, 09:51 AM
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The motor is running great now and I haven't had to change the plugs since my last post here concerning that issue. Yes its still rich when I first fire it up cold but the richness goes away once I drive it and warm it up.. There after I can let it idle and the fumes aren't strong and it doesn't foul plugs.. The car launches real hard from a dead idle and I have made some 6000rpm pulls with no issues at all so I thinks it ready. I don't have any spark knock with 93 octane fuel but I will be running racing fuel (100+) for this weekends race.

Compression, according to the company that built the short block is 10-1 with my 64cc heads. Fuel pressure has been adequate thus far at a steady 7 PSI.. The entire drive train is all brand new including TCI trans with 3000 stall, all new spicer u-joints, 4.11 posi, heavy duty balanced 3" half shafts, rebuilt trailing arms, adjustable trackbars, etc.. I assembled it all myself so hopefully it stays together

As for jury rigging, that wasn't my intention at all. I emailed Holley and asked was needed to run this system with jets (I checked my email again and it was a Holley tech not a Jegs tech) and they just said I needed the "fixed plate adapters" and then later said I also needed the upgraded super power shot hard lines that run from the new plate adapters to the solenoids and then install the appropriate jets I needed based on what HP I wanted to shoot.. If the plates are different then I agree, I shouldn't start rigging it but I didn't know that and Holley never told me that either.
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Old 09-02-2010, 05:30 PM
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Thank you, I'll let you know how it goes provided the weather is in my favor.. The closest NOS filling station was about 10 minutes away but there pump just broke so I have to drive over an hour tomorrow just to get the tank filled
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Old 09-02-2010, 05:37 PM
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Quote:
Originally Posted by My68Vette
Thank you, I'll let you know how it goes provided the weather is in my favor.. The closest NOS filling station was about 10 minutes away but there pump just broke so I have to drive over an hour tomorrow just to get the tank filled
Where are you at in Michigan, I may be able to point you in a closer direction. I'm just south of the cereal city (Battle Creek).
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Old 09-03-2010, 05:09 AM
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Quote:
Originally Posted by ericnova72
Where are you at in Michigan, I may be able to point you in a closer direction. I'm just south of the cereal city (Battle Creek).
I'm up here in the north, just below the Mackinaw bridge
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Old 09-03-2010, 06:49 PM
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Quote:
Originally Posted by F-BIRD'88
You can fill your bootle using the gravity transfer method with no pump by freezing your bottle overnight before filling. Stick it in the freezer overnight.

elevate the source bottle a bit higher than the receiving bottle. Put the receiving bottle on a scale
connect, then open both valves. Stop when 10 pumps of weight is added to your bottle by watchng the scale weight .
Do not over fill. The bottle must be very cold. (overnight in a freezer)

its that easy. Let the bottle heat back up to 85F before use. Hot tap water, bottle heater etc . Never use a flame on a bottle.

if you don;t have a bottle heater, take a big picnic cooler full of hot hot tap water to the track. it will last all day and easily heat the bottle to 85F-850psi.
You can adjust the bottle temp/pressure very quickly in the hot water cooler.
It's much faster than a bottle heater.
I was lucky enough to find another source that was even closer.. The guy drag races snowmobiles and has his own filling station.. I just came back from there with a full bottle and I'm ready to roll.. I'll try the cooler with warm water.. Now I just hope the weather holds up for Sunday.. 130 cars have entered already.. Its basically a heads-up, grunge match, race who you want, fun day with roughly 8000 spectators.. I just installed the new ET street slicks (28x11.5-16) and they hook hard on the road so it should be even better at the track with some VHT..

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Old 09-03-2010, 07:19 PM
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You're not going to pass tech with the nitrous bottle in the passenger cabin the way it is(if they follow the rules), you have to have a blow-off vent tube off of the pop-off valve fitting that vents the bottle outside when/if the blow-off disc bursts. This is only necessary with a bottle in the passenger compartment, not the trunk, but you don't have a choice with the Vette.

Bad thing is, you have to have the bottle empty to install it

You will also need a driveshft loop with the ET Streets at most tracks, they consider them just like slicks.
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Old 09-05-2010, 05:56 PM
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There was no tech inspection at all... They just ask if I had a helmet, thats it

Here are my 1st and 3rd passes, both wins.. The 1st pass was against a stock 84 Trans Am with 305 and by the time I went through the traps, he was at about 1/2 track .. The 3rd pass was against a more stout camaro and I ran my best of 7.62.. I could not hook up, actually knowone could because it was an airport runway so I think I could pull 7.40's or better at the strip. My best 60ft was only 1.83

http://www.youtube.com/watch?v=SMC6R9Lrq9w

http://www.youtube.com/watch?v=2oN65R7Ct3U
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Old 09-06-2010, 06:34 AM
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Quote:
Originally Posted by F-BIRD'88
Can you post the data from your timeslips. The MPH indicates how much HP you made, assuming you kept your foot in it all the way and thru the traps.
My last run was my quickest but it was my worst 60ft time.
Reaction: .871
60ft: 1.90
Mid ET: blank
Trap MPH: 95.1
ET: 7.624

Thats all the info on the timeslip and I didnt backpedal at all.. You can see me getting lose and sliding a little just out from the line but I still stayed into the pedal the whole run.. I just checked the replay on my tach and shift points were 6700rpm

Last edited by My68Vette; 09-06-2010 at 06:39 AM.
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Old 09-06-2010, 07:42 AM
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Something ain't jibing- I can see the 7.6 ET in the 1/8 or the 95 MPH in the 1/4, or is that how the event was timed?

Did you ever get the NOS hooked up?
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Old 09-06-2010, 10:02 AM
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Quote:
Originally Posted by cobalt327
Something ain't jibing- I can see the 7.6 ET in the 1/8 or the 95 MPH in the 1/4, or is that how the event was timed?

Did you ever get the NOS hooked up?
What dont jive, it was only a 1/8 mile race not 1/4... Take any 1/4 mile timeslip and look at the 1/8 mile on it and you'll see most 7.6 runs will put you in the 90mph range... NOS was hooked up and run BUT as stated above, I couldnt shoot it until I was at least 80ft out due to traction..
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