turbo-polak

im getting my hands on an 88 t2, and i was wondering what i should do to the motor so that it'll handle 15 psi?

will i be able to get enough fuel with the stock injectors? i'll have a fmic, and always run 94 octane..

any other ideas?

fuel pump, intake and exhaust obviously...

will the stock turbo be able to handle 15 pounds?

Kahren

iTrader: (13)

how much power do u want, read the faq

NZConvertible

Upgrade the turbo and intercooler. Neither of the stock items should be used with that much boost.

elfking

You will want to get a wideband 02 sensor as well. So you know if you are running lean to back off and not pop.

I would also recommend a Fuel Cut Defender. I can't remember what they try and cut you off at but I think it is around there.

BDoty311

Running 15psi on street gas is asking for it anyways, unless water injection is involved.

And why do you want to run 15psi anyways? Turbo rotaries don't really need tons of boost to make power. At 15psi, my car put down 408rwhp on a very hot and humid day. At 12psi, it will beat 600cc sport bikes. At 10psi, it will still scare the **** out of anybody riding in it.

Running high boost is overrated, and drastically reduces reliabilty. Trust me, I know, I just blew my motor with pre-ignition at 15psi.

BlaCkPlaGUE

Yea but 15psi with the stock turbo is quite a difference compared to 15psi of a larger aftermarket one!
I've been told a few times, even today, that the most you should ever do on your stock turbo is like 10psi, max. Im sure the high EGT's would radiat their way back into the combustion chamber and then *ping

BDoty311

Agreed , but I don't want people to think that they have to run tons of boost to make reliable horsepower. RX-7s are NOT supras. The only thing you need to blow in a rotary is a 2mm think piece of metal, and its not that hard to do when you are above safe boost levels.

turbine

iTrader: (1)

how many mm do you think a piston ring is ????

BDoty311

I don't know, but I bet you do.

How many piston engines see terminal failure because they were running too much boost and managed to destroy a piston ring?

Kahren

iTrader: (13)

i thought 1 bar is stock

noman17

DTBOY how long did yourengine last at 408 1 bar? did it go fast or after a good period of time?
and were you suprised when it blew, or did you feel the motor already starting to diminish.

BDoty311

The name is BDoty. I ran 12-13psi for a long time reliably, but I got slightly greedy. I blew the motor on an RX-7/import drive while running 14psi. Was fine for a few long punches, including a trip to 140mph. The engine blew after some amount of driving, I think that the heat was starting to build up, and eventually caused detination.

I was quite surprised it blew considering how good it had been running all day long.

turbo-polak

wow... 11 replies in like an hour...

yo Bdoty311 you got msn?

J-Rat

iTrader: (2)

AWWW!! Where is the fun in that?



FWIW, I did it knowing full well it was not right.

Kai

More then you'd probably like to think. Of course, the ring land likes to crack out first, taking the ring/s with it, but still.

hondahater

iTrader: (2)

maybe I'm doing wrong then but I run 15psi with my hybrid right now all the time (knock on wood). You guys got me scared now. I have taken my car up to 140 as well but nothing happened. Of course it's not a huge turbo like yours probably but it is a TO4B with stock housing. Would you not recomend going to 15psi in a hybrid or full turbo upgrade?

jon88se

And you're just running a walbro with rtek 1.7 and 720 secondaries right? No AFC...correct?

hondahater

iTrader: (2)

see sig.

ultradef

I was hitting 15 psi on my stock turbo and stock TMIC (due to boost creep) and my intake temps shot up drastically within seconds. The turbo is simply blowing hot air at that point. Even with a FMIC your motor could pop real quick. I also started to run out of fuel with 550cc primaries/720cc secondaries and a Haltech, so your stock 550cc injectors will definitely not be enough.

If you still want to run 15 psi, you will definitely need a FMIC. I would also port the wastegate, get a walbro fuel pump, 720cc injectors, and a fuel controller (SAFC, emanage, etc.).

jon88se

Basically the same fuel setup I have, though I'm still on the stock turbo. I haven't had it on the dyno or wideband yet but @ 13 psi (bleeding to 10psi above 5500) on a third gear blast she's still pretty rich to me as EGT's are at 680 on my GReddy gauge (probe about 2-3 inches from the start of the downpipe).

I was hoping to dyno this weekend w/ a wideband but we're gonna get a big snowstorm.