How much can i BOOST!????

[91turbo2]

i have a 91 mister 2, the mods i have right now are, hks intake, blitz nur spec muffler with 3" piping, tanabe downpipe, gutted pre-cat, blitz sbc, hks fcd, apexi afc. My question is how much can i boost with the stock fuel system with just the fuel controller. I know the rule of thumb is 14psi. But what about 17psi, or if its too much what if i put 104 octane and run 17psi... someone please help me with this one, i am trying to beat my friends new M3...at 14psi i lost by 2 cars, so i want to do something, and at that time i didnt have my fuel controller installed...Oh and one more question, what is the best ignition system for the mr2 and how much does it run, i heard jacobs is really good but i need to double check... MR2's Rule!

[SW20 MR2]

Running 17psi on a stock turbo probably won't provide much benefit since the turbo will be blowing a lot of hot air at that pressure level. Also, I'd be worried about toasting the motor due to the lack of an aftermarket IC.

The stock ignition system is good for 400whp. Just leave it alone and buy yourself an IC.

[91turbo2]

well i'm not gonna run 17 psi during the day, so the intercooler part isnt a big issue at night. And i have heard the stock ignition cant handle that much, because basically it is the same as the ignitions on camry's and celica's. With the kind of boost and fuel we run, we actually do need an aftermarket ignition, but i'm wondering if a coil by itself would make a big difference rather than buying a complete ignition system. And also, my question wasnt answered the first time when i asked if i can run 17 psi with race gas, and let me specify at night, not during the day when everything has been heat soaked and is hot as hell. And i'm gonna run some aftermarket fans both for my cooling system and my intercooler system.

[MRQtwinturbo]

what sw20 is trying to say is that after 16psi..the stock ct-26 loses effeciency....and all that is is basically doing is pushing hot air....regardless of whether ur running i/c fans...the stock IC will heat soak pretty much after one or two hard runs....i'd invest in an aftermarket IC before i worried about fans...
if u dont think the stock ignition is sufficient....best way is to test/tune it urself...run ur 17psi and see if the car "misses"......

[91turbo2]

Okay that i can understand, if it loses efficiency after 16 psi... Do you guys know of any companies other than hks and greddy that would have an intercooler setup for a cheaper price, because i'm saving up some money for the greddy upgrade kit and i cant afford the intercooler, and also one more question, if i get the greddy upgrade kit, with just a supra fuel pump and a fuel controller, will i have sufficent fuel for my system... I heard a lot of guys run the dual inlet for the fuel rail, but i dont see how that would be any different from a single because of the amount of pressure the supra pump flows... And i want to thank you guys again for your reply's you guys helped out a lot..i was looking for a mr2 forum for a long time, i just recently got this car and it is BAD ASS! toyotas forever!

[rezzle]

http://sdsefi.com/techcooler.htm

[MRQtwinturbo]

stock fuel system is good to around 300rwhp....i don't even think u'll need to upgrade ur injectors or fuel pump until u go with a bigger turbo.....before u start buying or doing mods...set urself a goal that u want to acheive....that will make decisions so much easier in the long run...only get what u need..plan long term with every mod that u do.....

[JekylandHyde]

Originally posted by 91turbo2
well i'm not gonna run 17 psi during the day, so the intercooler part isnt a big issue at night.

Incorrect. The OEM IC is inefficient. The piping is also very restrictive. A GReddy IC, would reap large gains for you.

Originally posted by 91turbo2
And i have heard the stock ignition cant handle that much....With the kind of boost and fuel we run, we actually do need an aftermarket ignition,

Incorrect. The OEM ignition is good for 300+ RWHP. I was boosting 20-23 psi form a T3T4 turbo on the OEM system.. and my system had over 190,000 miles on it.

Originally posted by 91turbo2
And also, my question wasnt answered the first time when i asked if i can run 17 psi with race gas.

I personally would never run over 14 psi without and upgraded IC and/or Water injection. Race gas will only buy you so much safety.

Originally posted by 91turbo2
And i'm gonna run some aftermarket fans both for my cooling system and my intercooler system.

You will never need aftermarket fans on your colling system.

If you want to beat your friend's M3, get a GREddy IC and use the race gas and shoot for 17psi of boost.

Engine safety comes before power in my mind.

...proper engine management, proper intercolling, proper detonation prevention.

What "fuel controller" are you using and how are you tuning it?

[JekylandHyde]

Originally posted by MRQturbo
i don't even think u'll need to upgrade ur injectors or fuel pump until u go with a bigger turbo

Correct.

With the OEM ct26 turbocharger (or any variation of it), you will never need to upgraded your fuel pump, injectors or ignition. I am still on my original 195,000 mile fuel pump.

[91turbo2]

okay that makes sense... Anyone know where i can find an aftermarket intercooler for a good price, i dont care if its air to air or air to water, as long as it does the job, and isnt like on top of the engine bay... and also i have the apexi afc the first gen with the five knobs...and i havent tuned it yet...and also does anyone have the flow characteristics of the stock ic and the greddy or hks one??? thanks guys.. big help

[JekylandHyde]

Originally posted by 91turbo2
also does anyone have the flow characteristics of the stock ic and the greddy or hks one?

[code]
Turbo Intercooler Mass-Flow Intake-Charge Temperature
1) CT-26 stock 24.5lb/min 254 degrees F
2) HKS, etc. stock 27.3lb/min 182 degrees F
3) Ct-26 GREDDY 29.8lb/min 142 degrees F
4) HKS, etc. GREDDY 30.8lb/min 123 degrees F[/code]

See here:
http://www.mr2.com/TEXT/CT26TurboLimits.html