rel3rd

iTrader: (1)

Assuming the fuel system is upgraded & up to the task, is there any reason why I shouldn't run a dry kit...125hp jetting at most??

I already own a TNT adjustable dry kit, so aside from doing a dry to wet conversion, wet kit suggestions aren't going to help me much.

LB9GTA

iTrader: (1)

Mine worked fine until my tranny slipped from 2-3. It over-revved and blew a chunk off of the piston.

I am putting the dry kit on my 383.

vwdave

I wouldnt feel comfortable running a dry kit on a car without a MAF sensor. (If your car is 90-92)

rel3rd

iTrader: (1)

Mine's an 85, with maf sensor. How are you guys running yours? Last "dry" kit I ran was on a 5.0 Mustang and that setup used nitrous plumbed to the fuel pressure regulator to spike the fuel pressure. Would I be OK like that, or should I go with bigger injectors and spray in front of, and depend on, maf sensor to enrichen a/f mixture?

83 Crossfire TA

iTrader: (2)

what does a maf sensor have to do with it?

vwdave

Its a accurate way for the ECU to detect how much nitrous is going in and to adjust the fuel mixture accordingly.

Damon

I think using the MAF on a 3rd gen to keep track of your nitrous might not work so well. I know the LT-1 and LS-1 guys do this sometimes but the MAF on a 3rd gen is different- and more fragile. The hotwire is basically a very fine wire filament, almost like a light bulb. I can imagine blasting cold nitrous through it could easily break it, even if it did read accurately (which I would also have my doubts about).

TraviZ

iTrader: (2)

Usually the nitrous nozzle goes after the maf, before the throttle body, Maf would not read the super cold gas.

mike1986fyrbird

What happens when you max out the airflow of 255g/sec on the maf?
Your ****ed?

rel3rd

iTrader: (1)

So...would it be wiser to convert my dry kit to a "wet" kit?

FWIW, the dry kit I have is an LS1 dry kit, which is designed to spray into the airbox just after the filter, but before the maf meter.

vwdave

Just convert to a actual wet kit and not worry about it in the first place? Thats whats going on my L98.

Evil86Saleen

I dont see why you couldnt use a 5.0 dry kit on a TPI car. Plumb the line to the FPR so that FP gets raised when the full throttle switch is activated. Same exact fuel system as a 5.0 stang with a FPR and return line.

Do the TPI intakes have problems with fuel puddleing in them like the 5.0 stangs do when using the wet kits?

Hell I am using a dry kit on my turbo 5.0 Saleen. Its rather small jetted at a 50 shot but it has been dead nuts relialbe for a few years now. The car has been dyno tuned.

kyle

rel3rd

iTrader: (1)

I've run the dry kit from NOS on about a half dozen 5.0 Mustangs. That was my original intention...to simply add a nitrous regulator like the NOS brand dry kit (for 5.0 Ford) has. Then only run like a 100 shot to stay somewhat conservative. Most recommend the "wet" kit for my Vette, but as big and full of obstacles as the plenum is, I can't even imagine that it not have a distribution problem with a wet kit...I may just sell it and not worry about it...

Evil86Saleen

Hey. I have been looking at ealry C4 vettes. Do you mind if I sent you a pm or two and picked your brain?

kyle

rel3rd

iTrader: (1)

Not at all, but I'm getting ready to log off for the night...be back tomorrow afternoon...pick away...

vwdave

Never said you couldnt. I personally wouldnt for my mentioned reasons.

Ive never heard of a puddling problem with a TPI manifold.

doc

It is OK to run a dry kit (and even inject it before the MAF),,, however, you must get more fuel. So install an AFPR and when you want to run the NO2, turn up the fuel pressure. While just doing normal cruising turn it down.

You have have to do some data logging or get a wide band O2 sensor to correctly identify the required fuel pressure while running the nitrous.

Edit: The MAF sensor most likely can not sense the correct air as the LS1 MAFs can, and of course will peak out at 254 gms/sec. The LS1 MAFs read up to 512 gms/sec. So turn up the fuel pressure or burn a special chip for nitrous

83 Crossfire TA

iTrader: (2)

Accurate? How? What, do you plan on mounting the nozzle in front of the MAF?

Yes, there are a few setups that do that (the 4th gen “death bag of nitrous…”) but all they’re doing is instantly cooling the coils so the ecm dumps all the fuel it can… conveniently it happens to be about what you need for a 150 shot, which is safe for a rather large range (after all, most N2O companies jet their setups for around 6:1 AFRs).

That would never work for a 3rd gen maf (I’m pretty sure that it would just kill the maf), so you’re back to a traditional “meter some n2o at the back of the FPR to spike the fuel pressure and deliver more fuel through the injectors. At least this makes some attempt at metering the fuel delivery, you can change the jet in the assembly to change the amount of fuel added.

I honestly don’t see why in 99% of setups people don’t just spray a wet shot and at least get a consistent mixture and be done with it. Much more reliable, consistent and less demanding of the fuel system.

Evil86Saleen

How is the S/D and MAF third gens different than the 5.0 mustangs?

The only time that I have ever heard of anyone running the nitrous infront of the MAF is on cars with a returnless fuel system. The NOS dry kits run a line from a solenoid to the FPR so that when the nitrous is engaged the FP is drasticly raised so that there is eough fuel for the car. On the returnless cars you need to run the nozzle infront of the MAF so that the MAF can compensate fo the extra fuel that is needed. On a TPI car with a return fuel system and a FPR there is no reason to worry about the MAF as the extra fuel supply comes from raising the FP at the regulator. Shouldnt be any problems running a small dry 100hp pill in a MAF or SD thirdgen.
kyle

Evil86Saleen

My only concern with the wet kit is IF the fuel will puddle in the intake manifold. They are not designed to flow fuel just air. I'm still learning the in and outs of TPI so I have no idea if the TPI intake has the same problem as the 5.0 stangs. Excuse my ignorance I am still learning the TPI.

NOS makes a wet kit for the 5.0 mustangs that sandwichs between the two halfs of the intake manifold. This sytem works great. If anyone offers something similar for the TPI I think that is the way that I would go.

later

kyle

vwdave

Forgive me for my ignorance of the dry kits. I honestly have never run a dry kit. Only wet kits.

formul8!!

Do not run wet kits on TPI's. They are meant to flow air only.

A few things will happen:

-Fuel puddling
-t/b, plenum, runner gaskets not meant for fuel
-fuel will wash carbon gunk into the cylinders

rel3rd

iTrader: (1)

Since I have no definitive answer...I think I have a solution...

The nitrous kit is on Ebay...

http://cgi.ebay.com/ws/eBayISAPI.dll...MESE:IT&ih=006

Damon

The answer was never in question, in my opinion. I think you did the right thing.

83 Crossfire and I are the only ones who seem to be agreeing here on the reasons why it's not the kit you want. He said it better than I did, but the basic reasoning is the same.

Wet, dry, that isn't the core problem. Blowing nitrous through the MAF on 3rd gen is not a good idea (again, in my opinion) like it is on later engines that use a much different MAF and computer system.

1991CamaroRslow

iTrader: (3)

Convert to wet and don't look back. I've sprayed many a bottle of nitrous at the 150 jetting through my car and recently upped to a 200 shot. NOS sells a nice spray plate that is setup like the Mustangs, as does TNW. The maf on our TPI car's absolutly won't support a dry shot, it'll max and you'll get no real enrichment. The fooling the FPR trick works as some members on here have pointed out but I never liked that setup, I'de rather risk unequal distribution with the wet kit.

rel3rd

iTrader: (1)

well...I don't think I ever said I wanted to spray before the maf...that was someone else's debate in this thread.

Right now the kit is $75 away from hitting reserve of $250...if it doesn't sell, maybe I'll play around with wet and dry setups at low hp jettings to see what happens...or spray my pickup truck...

formul8!!

Spray the truck!!!!

83 Crossfire TA

iTrader: (2)

Nutshell, spraying before the maf won’t work.

Dry (boosting injector pressure with N2O), works, I’ve never thought it’s as accurate as it should be and puts too much strain on the fuel system, too much potential to run out of pump or lock up the injectors (hell, if you have those 2 covered then do it).

Wet… puddling is a non issue if you only spray @ WOT and at reasonable rpms (say above 3000rpm), if you’re spraying under other conditions “you’re doing it wrong” anyway.

WRT to “fuel will wash carbon gunk into the cylinders” not sure what to make of that… it’s already past the air filter, where else is it going to go? It’s stuff that was intended to be burned off in the engine anyway? Spray it once or twice and any build up will go away? Clean it out with some carb cleaner (and burn it off in the cylinders) anyway? I mean, the only way that stuff will not be burned off in the engine is if you disconnect the PVC, ditch the evap/tank vent and get rid of any overlap and any residual pressure in the cylinders when the intake valve opens or if you don’t run the engine. Complaining about that stuff is like complaining about the passing of time, sure you can bitch but if there isn’t anything you can do about it.

TexasSilhouette

iTrader: (4)

I run the NOS Brand Throttle Body Spacer Wet kit and love it. One thing I did not do that I should have done was check my fuel pressure at WOT with the fuel solenoid open. The NOS kit is jetted assuming 28 PSI and my car was barely hitting 21. I installed a high volume fuel pump and had to completly rejet my system because the FP went up significantly. All is well now.

rel3rd

iTrader: (1)

Sold the kit on Ebay....

Thanks for the replies everyone....