InjectedSS

iTrader: (17)

My stand alone unit came with a high and a low pressure spring. What are the pros/cons to running high vs low pressure? I'm going to be running the stand alone to fuel just my direct port nitrous kit. 300 shot. Thanks

703crewchief

I have used both. High is better than low:

Finer increments of fuel pressure allow very fine tuning.
Better atomization of fuel (smaller droplets).

Low is better than high:

Higher pressure might be more likely to leak external or through solenoid.
Smaller fuel jets are more likely to be clogged with debris.

Low pressure has been proven and is still used by top nitrous racers.

A car I built though uses a high pressure stand alone with a fogger. This car is a 3400 lb. F-body with a stock cubic inch LS1 (stock crank) and has been spraying a 350 hp shot for over 3 years without a problem. The secret is to constantly check the fuel jets for clogging and always keep a fresh clean fuel filter in the system.

InjectedSS

iTrader: (17)

Thanks for the reply...

I spoke with a tech over at HSW and he was saying that LOW pressure is the way to go because its easier to dial in. Is that not correct?

TARZAN

iTrader: (12)

If you've got a DP, go low pressure

-Will

JL ws-6

iTrader: (50)

With a low pressure system, you'll have alot more available tech help from people, as that's what has been used forever and a day.

The high pressure system as mentioned will need more maintenance/checking of jets, due to the very small jet size, and the possibility of clogging one is alot higher.

If you have the option and no preferance, I would go low pressure.

InjectedSS

iTrader: (17)

Hmmm well the issue for me is that I have a dual stage setup on the car. 1st stage is a 150 shot wet thru fogger nozzle. 2nd stage is a 300 shot DP. I was running both of these just fine before at the stock FP and everything worked great then. I am just having a hard time thinking that it's gonna be that necessary to switch to LOW FP and then I'm gonna have to rejet both of my kits and retune both stages as well. Don't get me wrong if it's really that worth it I will do it, I'm not trying to cut corners or be lazy about it, I'm just trying to see how much running LOW FP is really that much more beneficial than running HIGH FP.

TARZAN

iTrader: (12)

If its already working, and its working well.....why is this thread here?

-Will

InjectedSS

iTrader: (17)

Well because the STAND ALONE IS NEW! I said that I been running my DP & Wet Kit with the STOCK setup. Now switching to a stand alone I wanna know what all the pros and cons are etc.

InjectedSS

iTrader: (17)

Anyone researching this later on, I ended up sticking to the high pressure spring and everything is working perfect. A lot nicer not having to rejet everything or buy new jets etc. Everything checked out perfect on the wideband and single digits at the track over the weekend were fine by me so high pressure spring F.T.W