500 whp + nitrous?

[gixxer750]

Well.... do you guys think a 50 shot to get the turbo spooled would hurt anything as long as I've got the jetting right? OH... BTW, I don't have any timing control, but I don't plan on hitting the button with anything less than 104 octane in the tank.


I know that sounds dumb...Here are details.


50 shot wet
8.4:1 comp ratio
Emanage with no timing control
20 psi
500 whp
104 octane...
Sprayed to make boost hit faster, and possibly under full boost.


Don't answer if you don't know anything about it. I wanna hear from duane, slow66, adjuster.... Knowledgable high horsepower guys that have been in the game and know whats going on. Not downing anyone, just don't want to hear from guys that are like...well I think so and so will happen(but are still running a stock CT with a downpipe or something)

 

[dbsupra90]

you just need the right jetting. 50 shot is pretty small and you shouldnt have to make any timing adjustments for it. just need to set your a/f's a tad bit richer to be on the safe side (altho im not sure what you are tuned to now). id stick to low 11's. also, i think it would be much easier to tune if you just sprayed the whole run. besides, after you feel what it does you wont want it to stop spraying

 

[Slow66]

You will have no problems with a 50 wet shot. 50 is small enough where no timing really needs to be taken out. If you just tap the fuel straight off the pressure side of the regulator, chances are you will be running too rich with the juice since the fuel pressure will still rise with boost and dump more fuel than you want. You'll want to run an additional regulator (carb style, preferably with a return) and regulate the fuel going to the solenoid to abotu 6.5psi.

Thats what i would do, but you could aso run the 50shot dry if you can compensate with fuel from the injectors too....

Also, i woudl use that shot all the way thru and not jsut for spool-up.....just me though

 

[Doward]

Yeah, gixxer you didn't mention if you were going dry or wet shot. Does the emanage have an input to increase fuel via an input voltage switch? If so, there is your answer.

Slows right on the money as far as a wet shot goes. With aftermarket engine management though, I prefer a dry shot (you'll get discussion either way)

As far as nitrous goes, a 50 shot is a weeny shot. You won't damage anything with it, but it will help kick your turbo in the ass - and that sounds like exactly what you are looking for.

 

[gixxer750]

50 shot wet. I'm getting an intercooler spray bar(free) for the purge too....

I guess I'm kinda getting it to just to have it, but also plan on using it. Only paid $100 for the kit.

 

[tissimo]

I've heard of a few setups that run a wet shot w/ a second fuel tank & pump for it.. and fill that with 110+ octane.. so when you spray it sprays high octane in it.. might take a little more to setup, but might be worth the results? so fill you gas tank with 93 but whne you hit the spray it sprays like 110 in and have no ill effects with the added power from the nitrous.. but for a 50 shot wouldn't worry too much

 

[gixxer750]

Well, I most likely won't be spraying under boost without good 100+ ocatane fuel in the tank.

I may spray it on 93 just to get the turbo to get positive pressure going.

 

[upgradedsupra]

Slow pretty much said everything else I would say.. but I actually tapped in to my one and only regulator. Most of the big dogs at RREV also run 1 reg and a similar set-up to mine.

PS:I do think 75 would still be fine if you run race gas.

Duane

 

[greg88]

My setup is very close to what you describe. I'm running a wet 50 shot to help spool the turbo, but I don't ever actually "hit a button" F&F style. I have a Hobbs pressure switch on the intake manifold and a WOT switch. At WOT when the system is armed, I get a 50 shot up until the manifold pressure reaches 10psi. I didn't build it however, so that's about the extent of my knowledge.

 

[gixxer750]

If you just tap the fuel straight off the pressure side of the regulator, chances are you will be running too rich with the juice since the fuel pressure will still rise with boost and dump more fuel than you want. You'll want to run an additional regulator (carb style, preferably with a return) and regulate the fuel going to the solenoid to abotu 6.5psi.

I got to thinking about this statement. I may be way off base here.

My aeromotive is a 1:1 regulator. So, as fuel pressure increases 1 psi per psi of boost... wouldn't the pressure differential remain the same, therefore inject the same amount of fuel into the nozzle? I mean, as the fuel pressure on the back of the jet increases, the air pressure on the other side also increases.

Am I right here, or way off?

Disclaimer, not doubting you slow, just random thinking out loud.

 

[Doward]

Actually, you are correct gixxer - this is why turbocharged cars do have a rising rate FPR, to equalize the pressure across the injectors.

Imagine running 30+psi of boost, with 26psi injector pressure

Slow, are you sure you're not thinking of a carb'd nitrous setup? (with a 6.5psi external regulator to the fuel solenoid for the nitrous, if I'm reading you correctly)

Duane's got it right for our cars, by tapping into his main FPR.

 

[Slow66]

The issues ive come across with plumbing the fuel solenoid/jet off the RRFPR is that obviously the fuel pressure will increase with boost but the nitrous jet is sprayign the same amount the whole time. So for instance if youre spraying to spool the turbo, at 0psi of boost, theres 38psi of fuel pressure going thru the solenoid/jet, btu at 20psi of boost theres 58psi of fuel pressure going thru the solenoid/jet. This obviously throws the mixture off. You could compensate by running a smaller fuel jet, but then agan, the mix would be lean first, until more fuel pressure came in.

IMO, if you run an additional regulator for the fuel solenoid, you eliminaate this by having the same pressure at the solenoid at all times.

You do not HAVE to run it this way, it will work the other way, btu this is what i would do if it were my setup. Take it FWIW.


EDIT- i hope it made some kinda sense....i ramble too much sometimes...

 

[Supra]

The issues ive come across with plumbing the fuel solenoid/jet off the RRFPR is that obviously the fuel pressure will increase with boost but the nitrous jet is sprayign the same amount the whole time.

Technically, the nitrous side would slowly decrease how much it sprays as manifold pressure increases... wouldn't it. :naughty:

 

[TurboStreetCar]

The issues ive come across with plumbing the fuel solenoid/jet off the RRFPR is that obviously the fuel pressure will increase with boost but the nitrous jet is sprayign the same amount the whole time. So for instance if youre spraying to spool the turbo, at 0psi of boost, theres 38psi of fuel pressure going thru the solenoid/jet, btu at 20psi of boost theres 58psi of fuel pressure going thru the solenoid/jet. This obviously throws the mixture off. You could compensate by running a smaller fuel jet, but then agan, the mix would be lean first, until more fuel pressure came in.

IMO, if you run an additional regulator for the fuel solenoid, you eliminaate this by having the same pressure at the solenoid at all times.

You do not HAVE to run it this way, it will work the other way, btu this is what i would do if it were my setup. Take it FWIW.


EDIT- i hope it made some kinda sense....i ramble too much sometimes...

With 0psi in the manifold and 38 psi fuel pressure there would be (hypotheticly) 5cc/min worth of flow going threw the fuel jet. with 20psi of boost, there would be 58psi of fuel pressure. the 20psi of boost in the manifold would negate the extra 20psi in the fuel line maintaining the initial hypothetical 5cc/min flow.

if you ran a seprate non rising rate FPR for the notrous solinoid regulated at 6.5 psi, as soon as boost pressure increased above 6.5 psi there would be no fuel flow.

 

[Slow66]

I stand corrected....nosechunks is absolutely right...my apologies for the misinformation... I work with nitrous a bunch more on carb'd stuff, and i think too much. Still no excuse....

 

[gixxer750]

Thanks guys!

 

[Doward]

I stand corrected....nosechunks is absolutely right...my apologies for the misinformation... I work with nitrous a bunch more on carb'd stuff, and i think too much. Still no excuse....

It's cool... as soon as you said 6.5psi, I figured you were talking carb'd application

 

[Slow66]

Yeah, im retarded sometimes.....not to mention a little while ago we did some experimentation on spraying wet into the compressor inlet, which of course changes things.... oh well..... my bad

 

[upgradedsupra]

LOL..I was thinking the same thing.. since I too have run nitrous on my carb car

Duane

 

[TurboStreetCar]

Yeah, im retarded sometimes.....not to mention a little while ago we did some experimentation on spraying wet into the compressor inlet, which of course changes things.... oh well..... my bad

how did that work out? i would be weary of spraying a highly flammable/explosive mixture into the inlet of an expensive turbo, especially with all that heat.

on a side note, whats the estimated finishing date for the drag project? i cant wait to see that when its done.