I will be getting a tune pretty soon and I want to know what the consensus is the highest boost that should be run. IX MR mods: 3"tbe w/ test pipe, apexi intake, walbro fuel pump, Hallman MBC running on 93 octane. Is 24lbs too much to run safely as daily driver?

 

you should ask this question to your tuner while you there, they will be able to tell while the car is on the dyno, unless you are getting a mail-in-flash

 

Your tuner will determine how much boost you should be running based off of datalogs and other tools at thier disposal.

 

Yeah, you don't set boost AFTER the tune. You get tuned at a certain boost level.

 

Well it depends on several factors if 24 to 25psi is safe. First off
the IX motor can simply handle more boost than the VIII can.Second is
the type of pump gasoline that you have access to,which needs
to be no less than 93 Octane,which will have its own inconsistent
nature of course.Then thirdly is the tuning datalog software
which will show the counts of knock present,AF ratio,IDC,IAT,PSI,TPS,RPM,
degrees of timing and the session weather conditions.
Then the reputable tuner of your choice will be able to alternate
the values of each parameter to establish a "safe tune" so to speak.
I would recommend that you should install an aftermarket intercooler and
some larger fuel injectors. Most people on this forum think that the OEM injectors
provide enough fuel for nearly any boost level using the stock 16g turbo
but that couldn't be further from the truth. I was previously running out of
fuel at 363whp on a dynojet and the injector duty cycle was about 105%
which is considered to be unsafe by many tuners including me.

Later man

 

the ix motor can handle more boost then the viii??? where did pull that out ur behind? its the same motor besides the head.

honestly its all dependent upon the octane and the tune. some cars can run 24psi and be safe but others cant. ask your tuner and as long as u are knock free, and the tune is spot on, u will be ok, but most likely u wont hit 24 psi without knock.

 

Well, yeah, and because of the revised coolant passages in the head, IXs can run more boost on the same octane than VIIIs without knock. This is widely-known and accepted, and that's what he was talking about.

 

I also agree thats old news for most people.

 

interesting fact. i didn't know that.

 

Thanks for the knowledge I will have the car tuned somewhere in Atlanta not sure yet. I know the tuner will have there idea of what is best but with all of the knowledge on this website I just wanted to more advice. Thanks again.

 

Well, that's the thing. It's not a matter of advice. You can't just think of boost in a vaccuum (no pun intended). There is no set amount of boost that all Evos of a certain type can run. The boost you can run depends on your mods, your octane, the health of the car, and the way it's tuned. If you are tuned with high 11 AFRs and a lot of timing, you won't be running 24psi. If you are tuned to mid 10 AFRs and low timing, you can probably run 26psi. The key is finding a safe, reliable, repeatable combination of boost, AFR, and timing. This is what your tuner will find...

You can choose between TopSpeed and Dyno4mance in that area, I believe.

 

Those are my two choices just not sure which one have heard pro's and con's about both.

 

I would go see Doug at Top Speed he knows the art of tuning very well and follow his suggestion

IMHO 24 - 25 psi is way too much on pump gas btw

I usually tune IX's at 21 - 22 psi depending on the car and fuel

 

I know you've alluded to this before for Big Al. But, I haven't been able to find it. What boost range do you consider acceptable for a custom tune for 93 oct on an Evo 8. Also, I have easy access to race gas(Sunoco 110) and can run a minimum 100 oct, as opposed to alky. I'm speaking in general terms, not car specific. Thanks.

 

I have heard some good things about topspeed and with your recommendation, I will defiantely give them the upper hand.