wet kit question

[1fast97gsx]

I understand a wet kit doesn't spray additional fuel through the injectors, but instead through a nozzle where the nitrous and fuel get mixed already. I'm running an scm61 turbo at 22 psi and would like to spray an additonal 50 - 75 shot. I'm not sure if I can just spray it and be close enough to the correct a/f ratio to not blow up the car and then fine tune from there? I say this assuming my safc settings at 22 psi are tuned properly. Should I still richen it up more or will the nitrous kit take care of the additional fuel on it's own? I'm running 780 injectors and the safc is at like -48 on the high settings so I know I have a lot more fuel I can get if I need it.

 

[peanotation]

on the nitrous end, the wet kit will properly proportion the nitrous and fuel together for a good ratio. assuming your engine has a nice a/f ratio, a nitrous spray via wet kit will in no way change the a/f ratio. assuming you installed the correct jets for nitrous and fuel, the ratio will be fine. keep in mind, this is purely for the nitrous end of things. throwing this all into a turbo set up should be fine, but i am no way knowledgable with nitrous going into a turbo application. i seem to remember something about turning the boost down when you spray?

 

[DSMJim]

Make sure you on race gas .

Ok to start go into your link and add 5-10% fuel across the board where your gonna spray and log it on a wideband during your first run with spray. I would also drop your boost to say 18 and see what your jump will be.

When you spray first things you'll find is your turbo AFR will be different than turbo & nitrous you will end up with different settings to keep it normal. Turbo cars are generally tuned for 12.0:1 and nitrous closer to 11.0:1 but on a turbo car it spools the turbo almost instantly and generally over runs the wastegate causing creep which will pump up your boost quite a bit. Your 18psi will likely jump to 20-21psi from the spray (or higher) and your air fuel ratio could swing either way, depends on your setup and how it reacts.

Just add some fuel turn the boost down and start with a 50hp shot and see how it goes. You shouldn't run into any problems if you start small and work you way up. You will see how nitrous effects your setup and what problems you run into and make adjustments from there as you move your shot up and turn your fuel down.

Typically a 50hp shot will give 100whp gain on a turbo application that is running a descent sized turbo. As you up from there it pretty well won't compound like that anymore just move up based on your jet size, so a 75hp shot will give 125hp type of thing. It seems about 50hp (give or take) is the HP effect from the cooling of the nitrous on a ~350-400whp car.

 

[1fast97gsx]

ok cool, thanks for all the info. I will give it a shot in the next few days. Right now I'm running 23 psi on the street on pump and it's tuned really well imo, but I will turn it down to 19-20 and spray a 50 shot and see what happens. Should be fun

 

[GSGoinFast]

dsmjim, please go here and explain what you mean about the 100hp from a 50hp shot. i tried but they dont believe me. here http://www.dsmtuners.com/forums/showthread.php?p=1137821#post1137821post1137821

thanks