Hi..

You can see in my sig. what i have on my FD . I want to know what experience you guys have on high boost on pump gas..??

I have a T51 and how high can i get the boost without damage the engine..??

Thanx

 

mine and a few others i know with big single turbos are @15 psi running 93 octane

 

That was not much.... I am running 19 psi (1,3 bar) and has doing that for some time now..???

15 psi for a T51 is not enough...?? It has to have at least 16 psi just to be alive...

 

It all boils down to the load on the motor. 19psi on a single? That's way too much on pump gas if it's your garden-variety 93 octane. Pump gas is highly unreliable -- ever wonder why so many motors are popping left and right?

B

 

we had 2 cars locally go to xs to get tuned (power fc....) and both were running around 12psi, for about a year or so, they stopped to get gas and both engines popped within a block of each other....

 

You know, our engines aren't cursed... they don't have a hex on them.. it's something else.

B

 

funny you mention that, its a long story but a friend of mine (gene kan) had a traction control penguin he bought, so i bought an apex seal retaining tucan, and in that 6 year span of time, no apex seals have broken in the household

it might have something to do with not doing stupid stuff too....

 

I remember Gene. I miss that guy.

B

 

yep, that was a really tough time

 

I tuned my car for regular (87) octane. And running 17-19 psi ever since Jan 2. This is on t04e 60 trim .96 a/r, stock block 13b-re, microtech lt-8, H-mount intercooler, etc.

 

......and I'm running -10 of timing. CJ

 

care to post your map and any datalog's you have? id love to read em

-Jacob

 

you talking about a t04b or a t88?

airflow is infinately more important than boost pressure, although the associated heat and stress does come into play.

a more accurate question for this thread would be more like "how much hp can i get on pump gas?"

 

Exactly, an Rx-7 we did in the shop did 27psi for a couple weeks on pump gas, just don't ask what the ign adv was....

 

my ignition was probably really retarded, don't remember, but I didn't just run it for a couple weeks, this is ever since jan.

 

I run 18 psi on pump gas when i has the T04R kit. I made 406 hp and 330 tq with that setup. I did run with that setup for 1 ½ year until I did buy the T51. I have now the T51 kai kit and was thinking to raise the psi a little.

We have tryed with 18 psi, and the engine did not sound troubled at all. I have to say that it is not the american fuel I am using. I run with the European fuel. But I have read that the american fuel is a bit better than the european.

 

The most HP I've seen on pump gas was around 450rwhp, on 93 octane, without water or methanol injection. Lots of tuners tune most engines with most turbos to 15psi on pump gas, and that's considered by many to be "safe" (although not by all). I'll let you know how trying for 15psi on 91 octane (AKA California Urine Cocktail) goes in a month or two.

Basically what everyone's going to say is that there's a lot of details that go into how much HP/boost you can run on pump gas. What kind of HP are you looking to get?

 

Mass air moving over a period of time; "boost" being an ambiguous term in and of itself; I'm well aware of both of these and have been for many years, Dave.

You are probably technically correct in re-stating the question but much of it is automatically lumped into the street port/TO4B, typical 400rwhp @ 15psi category that fits a seeming majority of the folks here. When I go out on my tuning trips to do cars, I try and take every single aspect of that into play instead of just using a single, arbitrary point of boost like "13psi" or "15psi". The larger turbos I won't comfortably tune as high on pump. The octane of pump gas makes a large difference. The altitude makes a tremendous difference. A bridgeported turbo motor won't see me going to 15psi on a large turbo without raising some stink. That kind of thing ...

B

 

i know you know what you're doing, you don't have to try to convince me.

 

bdc i ssee you mentiod how altitude can effect a tune... take me for instance, my car was tuned in atlanta but i will shortly be bring it back home to ny, is that a signoficant change in alitutde to warrent a re-tune? how does the atmosphere effect the tune *cliff notes version for the threads sake*

 

And you know that I know that you know ... that *I* know... that you know ... that we are both right... about this ...

B

 

What's the altitude of Atlanta? I'm not sure but I'd suspect it's probably not very high up above sea level just from guessing. When I mentioned altitude, I spoke more on the lines of something like Denver/Colorado Springs, CO that see from 5200 to over 7000 depending on the area you're in. I've noticed that cars up there don't make squat for power compared to ours down here. I've also noticed that, because of the thinner air, they can run more boost on regular fuel and also run more spark advance.

B

 

you're the only guy i know who will argue on a point we both agree on

 

.. and we can agree to disagree on that.

B

 

i disagree with your agreability.