I have a direct port manifold drilled and tapped but I am not sure if I want to use it. I want to spray a 200-225 shot. The main reason I don't want to do DP is because I don't think it will be usefull to spray that much in one stage (and I don't like the idea of progressive controllers). Also, I don't like all of the plumbing.

I have enough solenoids/nozzles etc to set up a 2 stage shot before the TB. Does this sound like a good idea? I can fuel it from a stand alone fuel cell and pump that I have (@ carbed pressure). I am ordering a Mallory 685 (i think that is the #) this week so that can control the rpm range of one stage, and I have an MSD rpm switch that can control the second stage.

I think if I spray a 100 shot at 3000 RPMs and another 100-125 shot at 4500 (or higher) that would be easier on my motor and I would be more fun if I want to spray on the street occasionally. I am still on the stock crank and I don't like the amount of torque that would result from a 225 shot at 3000 rpms.


Am I going to run into major distribution problems? I think I will be ok since the second stage wouldn't start until I was fairly high in rpms. Does anyone think this is way to much to spray into the TB? Let me know if you have any experiences with something like this. It seems like I am right on the edge of where people say you "have" to go to DP. One final question: Should I go to a plug colder than the NGK tr6 or will they be fine?

Thanks a ton
Dustin

 

I am using two nozzles in front of the TB and spraying 200hp with no problems. Not as elegant as a port system and probably doesn't make quite as much hp, but it works fine.

Rich Krause

 

That sounds good. I assumed it wouldn't make quite as much power. Has anyone ever measured the EGTs to see how much difference there is between cylinders?

Thanks
Dustin

 

I thought about it but never got around to welding adapters for the EGT sensors into the headers. I'd be curious as well.

Rich

 

Yeah, I don't like the idea of messing up that Jet-Hot coating with EGT sensor bungs. Maybe someone else has tried it?

Dustin

 

I was hitting a 1 stage 200 out the hole!!! No problems, but I have been told DP is 10 times safer and will actually drop your times.

 

DP is a little overkill for a 200shot, right?

At what point would you guys say a DP is a much wiser choice? In my mind I've always just assumed a 250shot+ mandates DP duty.

Ryan

 

I was thinking that DP would be overkill for me because there is no way I am going to spray over 250 HP. It sounds like most people think that a 200-225 shot will be fine before the throttle body. I think I will just try it in a 2 stage system before the TB for now.

Thanks for the help so far,
Dustin

 

You mentioned in the first post about keeping the fuel pressure at carb specs, i'm assuming 5-9 psi.

What if you up the pressure, lets say to 43 psi. or so, wouldn't that help atomize the fuel better and keep air velocity up ?

I've used a 200 shot through the TB with a single shark injetor and haven't hurt anything besides the tranny thus far. Not sure it was the correct thing to do on a stock bottom end, but it got me down the track fast.

How high of a shot could one go before changing to a colder plug than the NGK TR6 ?

 

Jon Phillips at NX has told me that anything above a 175 shot should be on a colder plug then the tr6.

 

What is the next colder plug than the tr6? (TR7?) Does anyone know the part number? I think NGK just changed some part numbers.

Will I have any trouble using a plug colder than the TR6 in a daily driver?

I don't know how much running a higher fuel pressure would help atomization. I think that the fuel is atomized because it passes into a stream of N2O at 1000+ psi (traveling very fast). Having the fuel pressure 30 or 40 psi higher doesn't seem like it would have much effect when compared to the 1000psi of the N2O. I'm sure it wouldn't hurt but, carbed guys have used low pressure for a long time. Also, you need a more expensive pump to get enough flow at a higher pressure.

Dustin

 

Yep, TR7 is the next colder plug. I stopped by a few parts stores and couldnt find any in stock, so I went with an Autolite 103, which is the same heat range as the TR7.

I would think you'd have to go with the higher fuel pressure levels to get 200hp out of single or dual nozzles in the air box/boot. I dont think you'd have enough fuel at the lower carb pressures...

 

Our intakes aren't ment to flow fuel, such as a carb. intake would, that is why I think a highier pressure might be better. My $02

 

Running a two stage dry kit, or 200+ shot in general isnt a good idea. i made that mistake. It can cause the car to lean out or cause the fuel pump to fail, eitherway resulting in some major head/motor damage. Not good to do w/o tuneing on the dyno and at least a better fuel pump.

 

btw, i just got my heads back today and slapped them on and my car fired right up. I ran, lets just say alot of nitrous, leaned out. Limped home, 2 of my cylinders had no compression. Everyone here swore up and down i melted some pistons but i lucked up and all it did was was mess up two valves.