[Robert]

Originally Posted by str_motorsport

I am completing the rebuild of my gti-r and ned a turbo to reach 450 bhp.
I know the turbonetics gt-k is the bet turbo with great spool and performance,but i would like to stay with a JB turbo to cut down costs,even if it will cause more lag
Was thinking about a t3/t4 turbo,with t04E compresor housing,60 trim wheel and a stage 3 turbine wheel on a .63 housing.
Now the question is...will this turbo support 450 bhp?
Or i should go for a bigger unit,like the 60 serie with typ S cover?
I have seen lots of different opinions on the 60-1 series turbos...lot of lag and poor efficiency...
My car will be used on the street and even if I know the ball bearings are much better in flow and spool up time I prefer to keep the JB turbos,mainly for cost and also for ease of rebuilding.
What about the T3/60-1 turbo? Is it true that to have full benefit of the larger compressor housing I should go for the .82 turbine housing?
Any idea on spool up time of the T3/60-1 and other T3/T4E turbos?
Full boost expected at how many rpm?
Differences in lag/advantages top end power between the stage 3 and 5 wheels and .63 and .82 turbine housings?
Please post your opinions and experiences,I am open to suggestions!
Will probably run 400-450bhp on the rebuild engine,but I don?t want to max out the turbo at that level.
I already have a Tial 44mm wastegate and a Lovefab equal length manifold.
Head has been gas flowed and port polished, with Jun 272? cams and Jun valve springs and retainers, so I will run a 8500 rpm red line.
Does the gt-k 500 is oil and water cooled?
i hope that i will find here the answer to my power goals!
Thank you very much,




David

A T04E 60 trim compressor has a max flow of 50 lb/min so provided your motor has a decent Ve and some good flow yes 400-450 BHP is well within the potential of a T04E 60 trim compressor. For your application I would most likely also recommend a T3 Stage 3 turbine section. The A/R is completely up to you but suffice to say the T3 Stage 3 can support your 400-450 bhp goal. There is at least one Scion tC owner here running a T04E 50 trim with a T3 Stage 2 turbine who makes 425 bhp at 22 PSI. That is basically one size smaller compressor and turbine then what I am recommending for you.