caseypayne69

Whats is the limits on Nitrious in these rotories?

100 shot to much?

crispeed

Nope!

caseypayne69

so whats asking to much. I know with piston engines 20 hp per cylinder is the limit really for stock cars. so whats the limit on RX7's?

crispeed

I know of people that are running 175 to 250 shot on gasolene fuel.

caseypayne69

what do they need to change? fuel pump ? anything else?

SPOautos

I'm seriously thinking of adding a 75 wet shot to my current set up. Right now I'm running 18psi of boost on pump gas making a little over 400rwhp and trapping 125 in the 1/4. I want to get over 130mph in the 1/4 so I was thinking of a 50-75 shot.

Anyone know if I could add a wet 50-75 shot to my current setup and still run pump gas?

Can I PM anyone that runs a lot of boost and nitrous on pump fuel that can give me some tips. I'm really in the dark about nitrous.

Thanks,
STEPHEN

Turbo 3

iTrader: (3)

Why would you run a wet shot? Wouldn't a dry shot be much much easier, cheaper, and quicker to install? Just curious or are you getting a deal on the setup...

Yes you will be able to still run pump gas but you will need to retune to add more fuel and adjust timing.

ScrapFC

iTrader: (5)

Scathcart appears to be the most knowledgable on running nitrous on a rotary. Do a search and you'll come up with lots of info. You'll at least need to beef up your fuel system and run a bigger wastegate, since the nitrous leans the hell out of the mixture and makes the turbo boost spike like mad.

chairchild

wet seups are WAY safer than dry setups.

But what's the safe working Bhp limit for a stock engine? If someone could tell us, then we could figure out how much N2o we could safely use

caseypayne69

exactly chairchild. I think ill go with 150 shot with my twins at 14 lbs of boost. hmm i guess i should buy the viper fuel pump its the same as some after market brands only cheaper. i wonder size injectors. hmm

SPOautos

Well, it depends on your definition of safe. To be honest there is very little difference between a "stock" engine and a engine from a "tuner" like say Pineapple racing, ect. There are people that have ran a ton of boost and got well into the 10's on a untouched factory reman. The key is tuning, making sure your a/f and timing is within the safe limits.

Thats where it gets grey for me, I dont know if the tuning parameters are the same for high boost with nitrous as they would be with just boost only.

If my a/f is high 10's low 11's and my egt's are say 1350F or less while nitrous is being used would I be ok no matter how much spray I shoot??? How do you know how much is to much if the a/f and egt's are safe? I really just dont know but hopefully someone like Crispeed or Judge Ito will let us know. They both have sprayed the **** out of rotaries.

STEPHEN

scathcart

Nitrous is huge on exhaust products. On stock twins, even ported wastegate, you will creep like mad with that level of nitrous.

scathcart

You can simply add more fuel with jetting the foggers to avoid leanign out. The problem is creeping when using stock turbos... its impossible to avoid.

scathcart

PM me with your setup.

scathcart

If nitrous is properly injected, you are limited only by the same things which limit a turbo engine: **** breaking, such as the drivetrain, irons, etc.

The only real difference is that nitrous oxide createsa huge amount of exhaust gases (the reason it is so great for spooling turbos). This means that wastegate flow MUST be up to par, and exhaust flow will be more sensitive to restriction.

caseypayne69

scathcart whats Creeping? I think ill just go with a 150 shot. As i'd turn the boost up to 12 or 13. seams like enough for me.

caseypayne69

Awwwe SCATHCART we became members in the same month lol

chairchild

But what about an N/A 12a?

would a 100 shot on a semi-PP be too much?

I'm guessing that I'll be getting around 250Bhp on my setup anyway, so I don't want it to blow apart in my face when I gas it!!

nillahcaz

iTrader: (2)

if you got to ask DONT USE IT!!!

caseypayne69

Um buddy im pretty sure what we've seen is that rotary engines turbo or not can handle up 200 of shot so as long as u retard the timing some and and a bigger fuel pump.

chairchild

Well, I'm really more interested in how much the stock internals can handle on a daily basis for around 30K miles, as I may be adding a supercharger ( I really don't want to use cheater-gas).

So I'd only be using a small amount of the stuff anyway, not going to push it to the limits

scathcart

Creeping is the exahust gases out-flowing the wastegate and the boost increasing above the set amounts.

As I have said before: do not use nitrous on any stock wastegates.

scathcart

Usually, I worry more about the clutch holding up than the internals. The stock internals are very strong.

chairchild

Well, the clutch is going to be a hybrid of RX7 and beetle components, so I can customise it to whatever requirements I need - basically the strongest that's "streetable"

Turbo 3

iTrader: (3)

Guess I'd like to hear your definition of "safer" as well for a wet system. The way I'm looking at this is that an EMS is running the motor and you have control over the fuel/ign parameters. When the NO2 hit happens, the MAP sensor "sees" the increase in flow, as well as the air temp and others, and correspondingly adds more fuel. I don't see how the wet will be any safer than a dry if tuned properly.