Direct Port Dry
Originally Posted by BLK02WS6
We've got one that runs out of the shop I work at - Accel DFI, Fast intake with direct port N2O only.
I remember Jason putting 42lb injectors in it at the track, no way they are enough for a 250 shot N20 only
Originally Posted by highrevinhp
apparently pat musi is running it like that
why is it not possible?
why is it not possible?
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.
Originally Posted by PHIL H
Which KOTH car is this Mike? Taylors old car? I think this would be the way to go if you have the know how. Also if you remember Moran used to run 2 stages dry through a single "wet" annular nozzle (he ran N20 through the fuel side).
Phil
Phil
Mike
Originally Posted by blacktransam
why couldn't you do it with an after market fuelsystem?? like an lt1 dry kit.. if you put a return system on the car vacuum operated regulator with the solenoid that spikesd the regulator?? we are running a 180 shot dry on an LT1 with 24 lb injectors through the stock system with a booster pump... when he spraysfuel pressure goes to 88 psi.. and he can very that with a jet in the vacuum line to the regulator..
a system like this would let you keep the stock pcm and just fool the injectors..
Mike
a system like this would let you keep the stock pcm and just fool the injectors..
Mike
Mike
Originally Posted by ATVracr
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
I remember Jason putting 42lb injectors in it at the track, no way they are enough for a 250 shot N20 only
Thread Starter
Teching In
Joined: Jul 2005
Posts: 11
Likes: 0
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?
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?
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Originally Posted by V6 Bird
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.
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.....
Originally Posted by ATVracr
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
I remember Jason putting 42lb injectors in it at the track, no way they are enough for a 250 shot N20 only
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
Matt
Originally Posted by 383LQ4SS
you could do it without a standalone too with aux injectors. You could use some type of cheap injector driver and set your duty cycle for XX size shot when activated. You could tune the AF via the driver and duty cycle for the size nitrous jets you have in the dry nozzles. You could get very creative with a little know how.
Originally Posted by ATVracr
No way they run a fuel spike like that. I've seen the car it looks like a regular DP set up to me.
Mike
Originally Posted by V6 Bird
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
Mike
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.
Last edited by Robert56; Jul 6, 2005 at 10:14 AM.
Originally Posted by Robert56
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 AIT 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.
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.
Robert
Edit: I am using HP Tuner and a LM1 wide band.
Last edited by Robert56; Jul 6, 2005 at 10:16 AM.
TECH Apprentice
Joined: Jul 2004
Posts: 304
Likes: 0
From: Texas
Originally Posted by highrevinhp
has anyone here tried a custom dry direct port setup or have any links or info on any setup like this.
I know there are a lot of people who are using custom dry setups and injecting the fuel through the injectors rather then the solenoids.
any info or feedback would be appriciated.
I know there are a lot of people who are using custom dry setups and injecting the fuel through the injectors rather then the solenoids.
any info or feedback would be appriciated.
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..
Originally Posted by David@TNT
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..