Turbonetics T3/T4 ITS 48 TRIM, for RB20?

[foulplay]

Hey guys I recently came across a Turbonetics T3/T4 ITS 48 TRIM. I currently have a RB20, and I am looking to upgrade the trubo. I am shooting for +/-300rwhp. I race in autocross events in my region and I am currently getting my *** kicked since the motor swap and the bump up in class. Would this turbo suffice for what I want it to do?

I am looking for a turbo that quickly spools, but a 48 trim seems kind of small to me, I was looking for a 57trim but I just havent come across one yet.

[mello88]

Your terminology is all wrong, "48 trim" doesn't exist... Trim usually refers to the compressor wheel, while "A/R" refers to the turbine housing shape [which helps dictate spool time]. An .48 A/R exhaust turbine is about the smallest you can find, it will reduce spool time but consequentially it will not flow as much on the top end. Most people seem to opt for the .64 A/R turbine for a balance between spool and top end performance. In your last sentence you mention you'd rather have a 57 trim... I know you probably meant a .57 A/R, but you're right about the 57 trim compressor. From my own research and looking at the compressor maps, the 57 trim .64 a/r T3/T04E is a good match for around 1bar of boost on an RB20. BTW, If you're into the 300hp range you should plan on new injectors [440cc-720cc] and some kind of management [rom tune, powerfc, etc]. Hope this helps... Have you read through the RB20 turbo/dyno thread on Skylines Australia?

[foulplay]

BTW, If you're into the 300hp range you should plan on new injectors [440cc-720cc] and some kind of management [rom tune, powerfc, etc]. Hope this helps... Have you read through the RB20 turbo/dyno thread on Skylines Australia?

Yeah I completly understand that I will need injectors, some sort of tuning capapbility, and a z32 MAF if it I dont go the MAP route.

I havent looked on the Skyline Aust for the turbo/dyno thread, will do so now.

Thanks for the response

danny