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My Rb26/30

j2fast

By j2fast,
in Engines & Forced Induction

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j2fast Enthusiast

j2fast

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Posted

hey guys,

well im in the process of getting a new turbo (the t72 blew) and i came a cross a free good condition turbo which is a precision t04r turbo. the only thing is it doesnt come with the hot side. so my question is what size should i go with? my motor will be completely built (ex. pistons, rods, valve train, 272 cams, port and polish) now im trying to make close to 800whp as possible with this turbo an i was thinking about getting the 1.15AR but didnt know if that would be way to laggy on this rb30 are not(i came from rb25). i will using e85 aswell for my fuel to high boost is not a prob im trying too aim for about 29psi as my high boost. i tried to look online but most post dont have results with the AR on it to compare. im not looking to get another turbo just needing help with this one to maximize my power from it.

thanks

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j2fast Enthusiast

j2fast

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Welcome to lag city

If you're not happy to consider a different turbo, all you can do is put the largest rear on it and be done with it. Don't complain about lag if you're not happy to change turbos :)

its not about me not wanting to get a better turbo, its about im getting this one for free until i get another one. i know i should expect lag, but im asking which AR is better for level of power im looking at with the stuff i have

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DYNOBUSTER Enthusiast

DYNOBUSTER

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the precision tO4r is very similar to a tO4 but the precision one has GT compressor wheel design and the old TO4 hot side and journal bearings so for road use... get a .82 or if they don't make one a .84 you will get 29psi with that using a big waste gate... you don't say what the purpose of this car is so it makes it difficult but if you were drag racing with a big stall converter and a trans brake you could go up to the next size I think that's a 1.00 and then 1.04 but a 1.15 is getting too big I think.. anyone else got an opinion??

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j2fast Enthusiast

j2fast

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the precision tO4r is very similar to a tO4 but the precision one has GT compressor wheel design and the old TO4 hot side and journal bearings so for road use... get a .82 or if they don't make one a .84 you will get 29psi with that using a big waste gate... you don't say what the purpose of this car is so it makes it difficult but if you were drag racing with a big stall converter and a trans brake you could go up to the next size I think that's a 1.00 and then 1.04 but a 1.15 is getting too big I think.. anyone else got an opinion??

i think the .84 would be to small for my application, but im using it for highway runs and to like mile runs to top out the car hoping to break over 200mph in a mile.

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