Im going to the track tonite and wanted to put some straight 103 octane in the tank. My mods are > Drop in fliter, fuel pump and Hallman Pro RX. I am running 21~22 psi (spike) on 93 octane. Think 26 psi would be ok?

 

umm i searched for a anwser like this for my 8 when i went to the track the otehr week and they said no because its not tuned for it. and just use the race gas so its safer

 

103 Might be pushing it a bit 110 and 26 would be more than safe however.

Scorke

 

isnt that a lil to much on the octane?? I dont think especially being with the stock ecu that he will be able to take full advantage of the higher octane and actually lose some power...i may be wrong but i know you can go overkill with the octane and lose power. I would think maybe shoot for like a 100 octane mix with 26psi

 

You may want to think about head studs if your going to do **** like this. Thanx

 

No, when adding boost adding octane cant hurt anything but power, and if your raising the boost 3-4 psi over what you normally run the extra octane is just extra insurance against detonation. I would rather run more octane and boost than timing, but thats just me.

How does a stock ecu limit his ability to take advantage of high octane? People are making well over 500whp on the stock ecu.... through the stock maf too. Do some research before you make statements like that

Scorke

 

i think you mis understood me on the "stock ecu" statement. What i was trying to say is the stock ecu is programmed to be very rich which means you should be able to run more boost on a "stock programmed ecu" than a flashed one that has been leaned out to maximize your power correcting the A/F ratio. Now if you throw 110 race gas on top of that i think it will be a little overkill IMO. Your just going to waste your money on expensive race gas. Go for a 50/50 mix of 104 and 93 yeilding a 98.5 octane mix ratio, crank the boost up to 25psi (anything higher than that the turbo is out of its efficency range, it will go higher but u will be blowing hot air and shorten the life of the turbo) and ur good to go

 

Tell TTP our other people running super low 11's or 10's in the case of Curt Brown that 25 psi is out of the "efficiency range".

Yes the turbo will not be working at its optimum efficiency and blowing hotter air than at a lower psi, but until somebody else goes that fast on a stock turbo not boosting 33+psi, I'll believe that a stock turbo at 30 psi will be faster than a stock turbo at 25 psi

BTW, what proof do you have that it will shorten the life of the turbo any more than running it at 25 psi?? TTP seems to think they are doing no damage boosting to nearly 35 psi...


Scorke

 

I mixed a quarter tank 101 with 1/8th tank 93. I ran 26.5 psi and had 0 knock counts on multiple pulls.

IX turbo's are more efficient, i would put more race gas in and go for 30 psi . You don't know anyone with EvoScan that can go with you?

Some dude running meth and pump @ 33 psi just made 430 whp w/ the basic bolt ons. I can't find the thread though...

 

That's OK. I run 30psi spike on 100 octane and it is tuned for it. great power. Check and keep an eye on air/fuel ratio11.7 OK.

 

jebus you guys are running major boost

 

stock's 19-20 spike at aroun 3500 rpms.

 

That's a nice Z you have there; wanna race?

 

i think you are taking this way out of context…I don’t think they guy that started this thread is lookin to break Curt Browns stock turbo record here, he just wants sum extra power when he goes to the track and prob not want to beat the crap out of his lightly modded car. Now when u start running higher boost than 25-26psi you do run into the risk of a couple things. 1 - anything higher than that psi level head studs might be a good option, not NEEDED but ya never know. 2 - running anything harder than its meant to will shorten its life, im sure the turbo is getting a little hotter than its meant to. Yet again no the its going to blow up your turbo but its just putting more stress on it and may shorten the life of it. 3 – if he has a stock ecu I think he is going to hit fuel cut well before he gets to 33psi. Its just that your pushing things harder than meant to and sh*t happens sumtimes.

 

Put in the race gas and you can up the boost to about 25lbs. Possiably more, but with no head studs and no tuning, I would just go with 25lbs.