Hey Guys, So here's the deal. This past fall I put a NX wet kit onto my car. Overall spent about $1000 on the whole setup and it looks pretty clean. I ran the car only a few times on nitrous and I kept looking at the oil pressure gauge(about 5-7psi at 700 idle according to dash). I decided to strike the 109.XXX short block and build a 383. Well in the process I picked up a V1 s-trim and I'm building the blower short block as we speak(4bolt splayed, scat forged crank, eagle 5.7 H beams W/ L-19's, SRP -31 cc dish pistons) I have 42# svo injectors along with a 255lph and RACE hotwire kit. I plan on running the svo's upto a decent duty cycle and no further till I upgrade them. Hoping to make somewhere the the area of low-mid 500 at the wheels. Also purchased a snow meth progressive kit to help a bit more.

Now the big question can I still run this NX wet kit at a 75 shot and be at a decently safe level of not blowing my motor up? Only plan on using the nitrous at the track BTW so pretty rare usage.

Let me know what you guys think thanks a bunch.

Mikey

 

should be no problem fuel system sounds too weak for a blower car though, 42lbs injectors defanatly arent good for the power you should be making. Well how much power are you planning on putting down anyways?
I run an external aeromotive A1000 pump which is 650gph and 86# injectors. i'm planing on spraying the car 75 as well which is like 120+ rwhp on a blown car

 

Your planned bottom end will be fine. When I did my rebuild I was on a tight budget so I'm still running the stock crank, I had the stock rods shot peened and installed -11cc forged pistons. Engine has held up fine for 35K miles running 10# intercooled boost and an occasional 75 shot of nitrous. I've dyno'd 593 rwhp. Your planned fuel system will be fine if you stay under 650 rwhp. After that your injectors will be maxed.

 

Yeah that was one of the big concerns on my mind was whether or not I was going to run out of pump. Definitly don't want to go lean and watch my new motor fry. I believe the pump with races' hotwire kit is rated upto 800 flywheel. The 42# injectors(new) I know are on the small side of things (they're only a temp fix). I actually got them as a addon when I bought the blower kit from him. I looked around and it seems people are maxing them out at about 500-520 rwhp. I also didn't know that a 75 shot was going to add 120 to the wheels on me. OBDE1 how much did that 75 shot raise your hp on the dyno? I figured it might be ok to do it since the fuel is pulled right out of the line rather than through the injectors.

Thanks for the replies keep em comin'

Mikey

Also how does the nitrous effect the dyno tune? Do you have to mess with the fuel jettings to richen it up or rely on the injectors to pick up any slack?

 

i run the combo on mine. luv it. just a small shot gives it a little pep off the line (1.25 60') and a nice intercooler affect (avg. 25-35 deg. drop).

 

Our setups sound pretty similar: I am running an F1 and an NX wet kit. As far as the original post goes, the fuel system (pump) will need to be upgraded.

Rich

 

Jeff Creech just dyno tuned my car last October. The 75 NX shot only yielded 52 rwhp on my setup; Jeff believes this is due to where I located the shark nozzel. I mounted mine in a straight section of the intake tubing at the output of the Vortech aftercooler; the nozzel is about 24" from the TB. Jeff said I'm loosing nitrous concentration based on spraying that far back and that the nozzel should be 4" - 6" from the TB.

 

Hey rich thx for the info.

Question: When do you think the pump is going to run out(HP wise) Also what should I upgrade to? aero 1000? 2000? Also if anyone has pics of a aero pump mounted that may very well help aswell.

Mikey

 

HMM, that's my dilimea, got the fuel system, just trying to decide where to mount that A1000.

 

The Aeromotive pumps are expensive and very noisy (I should know, since I have two of them with my current setup). I was happier with my previous setup, though I exceeded the amount of fuel it could supply and had to upgrade. Previously, I had a 255lph Bosch intank with a Kenne Bell Boost-a-Pump and it supported over 700rwhp. Quiet, relatively inexpensive and easy to install. I was using stock lines and fuel rails, BTW.

As to where to mount an external pump, I struggled with this. What I came up with works fine but is easier to show than describe. The pumps are mounted cross-wise (transversely), one on each side, in a small depression in the floor pan right next to the frame rails at the rear of the car. I have to notch the rails to clear the pump outlet. Like I said, easier to show than tell. But I would suggest the intank route. Maybe Racetronix dual intak setup?

Rich

 

I'm running 2 external Bosch 420's.

So how do folks change their tune for nitrous, take out a few degrees of timing ...?

 

i got a 10an bung welded in the passenger side buttom of the tank and the pump sits tucked in under the bumper if you behind me you can see it right below the licence plate with 10an hose in/out then goes up over the axle splits into a 10an in/ 6an out NOS Y, a 6an line follows all the way up to the intake manifold where i welded a 6 an bung into one side the other side of they y is stock right through the stock fuel filter and stock return. Yes Aero Pumps are noisy but you can get a pump controller and it should quite it down some when crusing around town

 

This seems to be the best route I've heard so far. I really don't plan on exceeding that much horsepower until the rest of the car is built up to support it properly. Where does one pick up the kenne belle boost-a-pump for a good price and would the race hotwire kit plug right into the booster?

Thanks mikey

 

blown cars are known to max out fuel systems a lot faster then Nitrous or turbo set ups. My friend was tunning this guys 02 1500 chevy with a P1sc and 125 shot, the car maxed out 60lbs mototrons at 580rwhp

 

I believe my friend Bob Kennedy still sells the B-a-P, the website is www.kennedysdynotune.com or call 716-693-5354. I believe that the Racetronix harness will hook up to booster, but I would check with them to be sure.

Rich