Supra Vs V8 Firebird Auto

[RScott]

then you will hit fuel cut.

[RScott]

basically what im saying is he needs a BCC type thing to go with it...
you cant just up the boost to the turbos limits and call it a day
theres other things that go with it

[DensoSupra]

why would you hit fuel cut when the turbo spools? fuel cut comes on at redline...or am i somehow mistaken?

[RScott]

you are very mistaken.
fuel cut happens when you boost too high
its a safety feature of the ecu to prevent overboost. on the mkiv it kicks in at like 13-15 psi

[longlivetheZ]

I believe you're the one that's mistaken, my friend. I think you misunderstood something you heard or read somewhere. Cutting the fuel to the engine is a very odd way of preventing over boost. I've never heard of a fuel cut being used this way. I don't know Supras well, but this is very strange. The only over boost protection I've ever heard of is on the 300ZX twin turbo (90-96). The engine will go into safety boost if detonation is detected and safety boost is not achieved with anything involving fuel sending.

[DensoSupra]

RScott is just being a fucktard.

There's a fuel cut wired into most turbo car's ECU's that cuts the fuel to the engine if the boost level go past a certain point. I just had a little misunderstanding before.

He's still being stupid. Stock boost on that car is probably 7-10psi. He could probably take it to about 14psi and gain a ton of power. Anything over that and you'd most likely be hitting fuel cut... unless you spend another $150 on a fuel cut defenser which completely eliminates the fuel cut.

[projectsupramk3]

MKIII's have FC at about 12psi with no boost leaks, although most people hit it before that cause of heat or countless other variables. A Lex/550 setup will raise FC to 18psi with no defenser and flow the 25% more air/fuel to the engine. Two different cut defensers, the HKS FCD and the Greddy BCC which will raise it even more. As for the fuel cut, it's not all that strange as rotory's actualy cut fuel, Supras actually cut spark not fuel, based on airflow through the AFM.
EDIT: Just saw your post densosupra, boosting anything over 12psi on a stock CT-26 will be blowing nothing but hot air, and scott definetly has it right.

[black02WS6]

everyone in here seems to be under the impression that because the firebird is an automatic, it is slower then a six speed. in reality, it's both faster, and more consistent. if this girl is on normal tires, it may be a good race just for the simple fact that she will go up in smoke. if she has any sort of street slicks, she is going to murder you in your current state. if you choose to do some mods like a boost controller, etc. then you may beat her. as it stands right now though, i give my vote to the firebird.

[RScott]

faster drag but top end falls off for autos. You have to remember that autos arent as efficient as manual cars since they work on a fluid clutch (torque converter). depending on the year of the firebird, the mkiii will either get beat or smoked. I wonder how this race turned out or if it even happened seeing that it was posted like 6 months ago.

[flyinMKIV]

Project and Scott are both correct. If you try to up your boost without eliminating any of the defenses your ecu has already programmed in, you will hit fuel cut. I would recommend getting a BCC to compensate your fuel cut. Finish your exhaust and you will most likely not even need a boost controller since your car will most likely up the boost on it's own( my MKIV did ) other than that you should be set, good luck

[Tech-Ronin]

Get the boost controller and a FCD I would spent $1000 before I lose $100 to a chick in firebird

[Tech-Ronin]

Originally Posted by longlivetheZ

I believe you're the one that's mistaken, my friend. I think you misunderstood something you heard or read somewhere. Cutting the fuel to the engine is a very odd way of preventing over boost. I've never heard of a fuel cut being used this way. I don't know Supras well, but this is very strange. The only over boost protection I've ever heard of is on the 300ZX twin turbo (90-96). The engine will go into safety boost if detonation is detected and safety boost is not achieved with anything involving fuel sending.

Let me ask you a question.. When you let off the gas when your pressure is spooled up what happens?

http://www.hksusa.com/categories/?id=1925

Now once you answer that you would understand why taking fuel away prevents over boost.

Class dimissed.

[corvettezo6]

wow u would get smoked its a v8 buddy v8s own v6s and i know it depends on other shit but seriously ull get killed if its an ls1 they have 350 hp and run 13.0s and have a top speed of 167 mph

[projectsupramk3]

Why did you bring back this antique thread only to contribute that wonderful tidbit of biased information?

[blakscorpion21]

i know plenty of v6s that can smoke v8s, hell i know 4 bangers that can smoke v8s. firebird would beat mk3 prob. but mk4 would smoke the bird