I thought Chuck's car had a stand alone fuel sys. that you guys ran race gas in for the direct port?


I remember Jason putting 42lb injectors in it at the track, no way they are enough for a 250 shot N20 only

 

Its very possible! We run the Musi setup in our Pro Mod. 3 stages, all nitrous. The fuel comes from 200lb p/hr injectors.

 

Good stuff here. Now if we could just come up with an injector like a diesel injector than can handle the 1100 psi of nitrous...and hook it all up to a computer...youd have the best well mixed, computer injected, at the port whoopass sytem capable of crazy stuff. You could really let things fly with something like that.

 

I just cant remember the guys name right now...When I think about it ill remember...Whats going on Phil!

Mike

 

That might work too....I know ive got a single nozzle dry kit on my LS1 setup like the LT1 stuff....I will say that bitch hits!

Mike

 

Actually they are....I run a A1000 pump and used 250 pills a few times...The AF was crazy FAT at 10:1 off the chart too....I run the 42lbs and the FP was spiking to 80 psi.

 

I like the fuel regulator on the oem computer method

That's not a bad way to do it either, very simple and to the point.

All you need to do is have a wot switch and a seperate or even the existing pressure regulator modified that when the nitrous is armed will bump the fuel to whatever pressure will get you the proper a/f mixture.

All you would have to do is tune with a wideband or pyrometer and tweak the fuell pressure till you get the proper mixture.

I know that zex dry kits work like this, they modify the existing fuel regulator instead of using an extra fuel solenoid.
They spray some nitrous to keep pressure on the hat of the pressure regulator to bump up the fuel when nitrous is armed.

Another question I have is I heard that tuning nitrous with a wideband is not that great and that a pyrometer is the way to go, anyone?

 

It's actually one of the most effecient ways to use nitrous if you've got FAST/BS3/DFI.

 

No way they run a fuel spike like that. I've seen the car it looks like a regular DP set up to me.

 

k, didn't read all the replies, but depanding on the shoot, you might be able to get away with it with a bigger injecter and the maft. I was going to splice in the maft in my car at one point for my dry kit and run it on a switch. not sure how well it would have worked....never ended up doing it.....

 

It did have, but not using it any more. I'm not sure of all the details now about injectors or shot size - I think the injectors are up since that day and the shot is down a little. Like I said, not up on the details, but it is working good with a few more bugs to work out...

 

Correct,
We have helped customers with setups like this.However you can not do it on the average setup./You will need DFI or Fast.
Dave

 

This is the way we do it with our injector driver system (128 duty cycle points). As mentioned before a aftermarket PCM would work also, except BS3, unless they came out with an update to allow fuel addition on a dry shot.

Matt

 

My car is a single dry nozzle before the MAF...The 42lb'er damn near drowned the motor with fuel..lol But even if they were maxed out, they have a larger orfice to flow more fuel then say a 28 lber...I know the pump will continue to supply the demand....Ive seen the pumps max out on a turbo setup at like 650rwhp and go lean...Not sure what kind of pressure spikes the turbo cars provide at the regulator though.

Mike

 

I wasnt talkin about your car

 

Have any of you gone to bigger injectors, then used Power Enrich Fuel Adder vs Intake Air Temp table. You can put any multiplier you want per temp. I have only begun with this. So far using a small multiplier, I figured from logging IAT on the spray. Depending on the size dry shot temp goes way down. Also, as your bottle pressure goes down you can compensate with a larger multiplier for a higher IAT. Seems to be working so far.

 

I need to look into that table myself to take fuel away on the juice....The car gets the fuel from a FP spiker...The PCM is also adding fuel too. You think i could use this area to do this succesfully?

 

Here's what I am trying. Get your PE wot multiplier to the ratio you want n/a. Then start logging small and see what your IAT's are at and make adjustments with IAT multiplier, as it comes zeroed out. What I have seen so far, when on spray (small shot) IAT's are dipping into the low 30* area. It's an area that I won't see n/a. Right now I have my a/f at 11.5 to 11.7 depending where I am at in rpm band through my PE, but am working towards leaning out PE for n/a and using IAT's for the juice. I don't know of any one else doing this, so the total end result is unknown, but looks very promising. I think for dry hits we can have at tune for n/a and juice, for timing and fuel, in the same tune, best of both worlds.
Robert

Edit: I am using HP Tuner and a LM1 wide band.

 

We have only done 600hp dry with a FAST box, but we also have a set of 10 recyclable pistons as well.. Advantages are more pro towards dry than con.. The jetting can go from 75hp on a direct port to the the max that the motor will sweep.. Just know your tuning to a t and your good ta go man..

 

Dave, was it a blue LT1 car?