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The 0.68 would be "snappier" as it runs into boost, with an earlier/faster rate of acceleration of the rotating assembly. The 0.87 may result in too slow a rate of spool but certainly give the feel of making lots of power higher up.

Bit of a juggling act to get sufficient bottom end response and torque from the smaller cubic capacity engine, but allow sufficient mass flow through the turbine housing to not choke things higher up as revs and power output rise.

Dependent on what other mechanical modifications are made (manifolding, porting, cams), the 0.68 might prove to be the better match to give area under the curve. Focus on the torque curve.

Edited by Dale FZ1

My opinions only , take them or leave them .

To me a GT3037 seems like a lot of turbo for a 2L six , some even think they are a bit ambitious on an RB25DET .

If I had to run a 3037 GT Pro on an RB20 based engine I would opt for the smaller or 0.68 A/R turbine housing .

Depending on how much power you realistically expect to make maybe a HKS GT-RS would be a better all rounder in a street car - definately cheaper and easier to fit .

A turbo car doesn't have to break into wild wheelspin as soon as it comes on boost , I reckon that's more an issue of the transition of no boost to too much boost over a narrow engine rev band . If you can get it to make adequate boost initially and ramp up a bit with engine revs you may find the lack of traction less of a problem .

A .

sry disco but im aiming for 400rwhp ive got an apexi ax53b70 in there atm and thats around the same as the gt2535 so an upgrade to the gt-rs is not worth the money imo an rb20 is going to b laggy no matter what so i think im guna go 4 the .87 will post dyno results when car is done cheers boys

Edited by Justa32

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