FI + spray
06-25-2009, 03:27 PM
#1
FI + spray Why is it possible to spray a super-charged set-up much more than it is a turbo set-up?
What are the limits on how big a shot you can do with each? (probably depends on a million things, right?)
Say a super-charged 422ci making 900 RWHP?
And say a big single turbo 422ci making 1,200 RWHP?
How much can you spray each?
:wall:
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What are the limits on how big a shot you can do with each? (probably depends on a million things, right?)
Say a super-charged 422ci making 900 RWHP?
And say a big single turbo 422ci making 1,200 RWHP?
How much can you spray each?
:wall:
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06-25-2009, 04:06 PM
#2
For the turbo most guys use it to help spool a farily large turbo. A supercharge car Im not sure because its two power adders and one will help the other in a number of ways. Also the rating of the nos jet doubles on boosted cars. 100 shot is equal to a 200 shot on a boosted car.
06-25-2009, 04:11 PM
#3
For the turbo most guys use it to help spool a farily large turbo. A supercharge car Im not sure because its two power adders and one will help the other in a number of ways. Also the rating of the nos jet doubles on boosted cars. 100 shot is equal to a 200 shot on a boosted car.
Not like 200 shots, right?
06-25-2009, 04:17 PM
#4
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Wow I've never heard of the nitrous doubling so if I were to put a nx single nozzle 75 shot on my 347 with a t76 that makes 800hp it would make 950 on spray?
06-25-2009, 05:02 PM
#6
I doubt there is any real rule for how much spray you can use on what FI setup.I have seen nitrous used on lots of turbo builds very common on the dsm cars like my talons to run both. Nitrous costs money and boost is free so most do use smaller shots of spray as said mostly to spool up the turbo fast and to supercool the intake charge.
So common to see guys running like 75 shots, 100 shots. Normally you don't see huge shots of spray with the turbos easier to just let the turbos make most of the power.
Example I have spray on my car. Physically installed but not finished have wiring still to do.I was planning to likely run say 850 engine and then add say 150 shot to get to say 1000 engine hp. But have seen many times that the rated shot does yield higher hp when combined with turbos. Not sure if there is an exact formula for it though.
I think its good idea to stay pretty conservative with the nitrous but not really really low like 35 shot type of thing. We have v8s not four bangers so a bit more spray should be no big deal. Of course you need engine built to take the power, fuel system that can support it. Wet kits of course don't require bigger injectors.
I don't see much combined spray and FI on this forum.
So common to see guys running like 75 shots, 100 shots. Normally you don't see huge shots of spray with the turbos easier to just let the turbos make most of the power.
Example I have spray on my car. Physically installed but not finished have wiring still to do.I was planning to likely run say 850 engine and then add say 150 shot to get to say 1000 engine hp. But have seen many times that the rated shot does yield higher hp when combined with turbos. Not sure if there is an exact formula for it though.
I think its good idea to stay pretty conservative with the nitrous but not really really low like 35 shot type of thing. We have v8s not four bangers so a bit more spray should be no big deal. Of course you need engine built to take the power, fuel system that can support it. Wet kits of course don't require bigger injectors.
I don't see much combined spray and FI on this forum.
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06-26-2009, 09:25 AM
#9
I dont think you will have back pressure iss ues with the tc 76 on no2 but your sure as hell will spool faster. Back pressure issue genrally come from to small turbo for the motor and to restricive exhaust ie running through a cat back. If you do the math on that turbo and compressor map you will see the threshold of where it maxes out and you just blowing hot air. But if that turbo is rated at 1k at the fly they are sometimes max out at 800+ to the wheels. Or very close. If your into drag racing alot a small shot to help spool will work wonders if you hook up.
The key is to find a balance of what works with the car and run with it. Hell if you use a 50 shot you will know a big diffrance.
The key is to find a balance of what works with the car and run with it. Hell if you use a 50 shot you will know a big diffrance.
06-26-2009, 01:19 PM
#10
So would I be correct in saying that if a car is used for roll races, say 50-180 type runs......single turbo set-up...that there's no need at all for a 35-50 shot because the turbo would be spooled up already while at 50mph, waiting for the honk to start the run? Or would it still be a nice benefit?
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