Just wondering what the maximum boost people are using with largish turbos on a 13BREW?

Obviously drag racing specials are using some stupidly high levels of boost, however I am interested in finding what people use on daily drivers or weekend specials. Consider the above question in relation to a well built fresh engine with all the correct supporting mods (Cooling, intercooler, clearancing , fuel, incredible tuning etc). Looking at GT42R , HKS T51R SPL, etc sized turbos.

What boost are people getting away with reliability? Do you use a "daily" boost level, and a "fun" higher boost level when required? Do you use methanol or water injection?

 

10psi all day long no more though... on a fresh rebuild, I hope your staying off boost until its broken in! Are you planning to go twin T51r or GT42r? Their big turbos to go twin? Why don't you just go single? I'm running stock twins and would not boost it above 10psi for reliability but with mods its different, again, I would probably stay at 10psi... maybe you should look into stage 3 BNR's?

 

whatever u can run with a good & safe AFR

 

If your set-up is good and strong most cars will take 15-17psi all day long without hassle...

With the turbo size your talking about they will more or less be the same sort of power output aswell as the same amount of lag...

 

assuming all the proper support systems as you list above, the determinent is fuel.

it is all combustion chamber pressure. too much for a given octane level and engine failure.

you have options.

run pump gas and you will, depending on the rating, be stuck around one bar with another couple psi if you want to roll the dice.... (think- getting a subpar tank of gas for instance).

run AI. see the section. all of a sudden you can reliably run 20+ psi. choice of injectant is water and or alcohol. i run alcohol.

no knock no where.

just recently there have been major advances made w re to AI systems. see my recent posts re my new FJO AI setup in the AI section.

good luck,

howard coleman

 

I'm not sure what this guy is talking about, but it seems like most people run 15-17psi on pump and when they really want to get on it they turn up the boost using water/meth injection. I've been running 17 psi for about 5000 miles with no problems and am going to add a water/meth kit so I can run around 23-24psi. If you don't plan on getting water meth and are going to stay around 15psi then you may want to go with a smaller turbo. You need to turn up the boost on those turbos you listed to really utilize the benefits of a larger turbine.

 

Sorry guys, I should have been a bit clearer with my question...

I have a HKS t51 SPL BB with the full hks kit, I have a well built engine (Waiting on completion anyways) running NRS 2mm seals, a huge **** streetport, clearanced / balanced etc. I am running 2 x 1700cc bosch blues, 2 x 1000cc bosch primaries, with sard 280l pumps pushing the fuel through. excessive LIM, and will be using straight water injection up around the 30% mark. I have a HKS Twinpower, power FC, FJO injector driver, and Greddy iridium racing plugs. the back end is a 3.5" full SMB exhaust.
Basically I am throwing a fair bit of cash at getting a nice reliable engine with some reasonable power.
I am aiming for around the 2 bar mark (28+psi) and obviously I will run the engine in properly first

Basically I was after seeing how much boost anyone has been silly enough to cram into a well built and well supported engine. Is anyone running over 30psi reliably with this size of turbo???
Do the people running the higher boost levels run with high / low boost settings, or just on the higher settings? how many km's have they lasted?

Any problems? Eg crushed rotor faces? ecentric shafts dying? etc etc..

Thanks for the info so far..please keep it coming!

Edit: Also of note, I am in Australia and have access to both 98 ron, and 100 ron pump fuel (I think thats around 95 / 97 on your scale?)

 

I was refering to stock turbos! My bad!

I thought he wanted to get the setup he was talking about.. I didn't know he already had it! ^ +1

 

so what your trying to ask is?

Guys like ernie running 35psi and making 700rwhp with gt47 turbos, do they run this boost everyday with their methanol/racefuel or is it simply for the dyno run or track run

 

I assume you have tons of open road? Otherwise, I'm not really sure what you're going to do in normal driving conditions with a T51SPL and 30psi...

You CAN however run like that provided you spend a nice chunk and get someone to tune the goddamn thing. Ask Viking War Hammer. He used to blow his **** up all the time - but when Steve Kan tuned it, the damn thing could bounce off the rev-limiter for 24 hours straight with no issue.

So - in short, the answer is not really available. Sounds like your setup will do it, but if you don't spend the time tuning it, you're just wasting your time.

Justin

 

Thanks guys,

Yes plenty of open road

35 psi!!! on a gt47 ...nice....and obviously Ernie is not having troubles?

Tuning is not a drama, the best tuner in Australia will be on the case.