[SupraT72]

This is my first post so hopefully this is the right section to use for this question.

I've had a Q trim T72 on my mkiv Supra for about 4 years now. Its a great turbo, spools well and makes 415rwkw (about 700hp at engine) at 21psi on pump gas. Unfortunately on checking it I have found that something went through the exhaust side damaging the turbine wheel and I would like to get a new shaft for it to be on the safe side.

What I would like to know is, can I use a new F1-68 shaft with my old T72 exhaust housing and center section? It says on the Turbonetics site that you need the new F1 housings but I would prefer just to machine my exhaust housing a little bit if thats all that is required to fit the new wheel. Does anyone know if this is possible?

[Robert]

Originally Posted by SupraT72

This is my first post so hopefully this is the right section to use for this question.

I've had a Q trim T72 on my mkiv Supra for about 4 years now. Its a great turbo, spools well and makes 415rwkw (about 700hp at engine) at 21psi on pump gas. Unfortunately on checking it I have found that something went through the exhaust side damaging the turbine wheel and I would like to get a new shaft for it to be on the safe side.

What I would like to know is, can I use a new F1-68 shaft with my old T72 exhaust housing and center section? It says on the Turbonetics site that you need the new F1 housings but I would prefer just to machine my exhaust housing a little bit if thats all that is required to fit the new wheel. Does anyone know if this is possible?

Unfortunataly machining it probably won't work. we tried doing that with a new F1 T3 wheel and an application specific housing but the results were mixed. Your best bet is to get the turbine housing for that wheel.

[SupraT72]

Thanks for the info. I'll go with a new housing to be on the safe side then.

[Robert]

Originally Posted by SupraT72

Thanks for the info. I'll go with a new housing to be on the safe side then.

Anytime.

[SupraT72]

I've just bought a brand new Turbonetics T76 (with the F1 turbine wheel) instead of getting my T72 repaired. Hopefully the higher surge line on the T76 compressor map won't cause any issues. I've also just refreshed my engine and have done Brian Crower 1mm oversize valves and have Crower 10.3/10.5mm and a ported head cams so the head should flow enough to not be an issue. I'm running in the car over the next few weeks then we will see what power it can make. I suspect my Bosch 044 will run out of flow at around 430rwkw (previously had 415rwkw at 21psi) so that will be the next item I will need to upgrade.

[Robert]

Originally Posted by SupraT72

I've just bought a brand new Turbonetics T76 (with the F1 turbine wheel) instead of getting my T72 repaired. Hopefully the higher surge line on the T76 compressor map won't cause any issues. I've also just refreshed my engine and have done Brian Crower 1mm oversize valves and have Crower 10.3/10.5mm and a ported head cams so the head should flow enough to not be an issue. I'm running in the car over the next few weeks then we will see what power it can make. I suspect my Bosch 044 will run out of flow at around 430rwkw (previously had 415rwkw at 21psi) so that will be the next item I will need to upgrade.

Nice purchase!! You won't be disappointed with that unit.

[SupraT72]

Just dynoed my 2JZ-GTE Supra with the T76 a few days ago and no sign of compressor surge at all despite what all the calcs say. I can only assume that the surge line on the T76 map is shown higher up the airflow range then it really is.

I got 380rwkw at 19psi and I will install a Pierburg 1000hp fuel pump, bigger fuel lines and Bosch filter before turning boost up to 23-24 psi on pump gas. Should be good for 420-430rwkw then. The goal is 450rwkw at that boost level on pump gas and I have intercooler plumbing, custom intake manifold, 80mm throttle body and bigger exhaust pipes and downpipe mods yet to do, so hopefully I'll achieve that goal.

[Robert]

Originally Posted by SupraT72

Just dynoed my 2JZ-GTE Supra with the T76 a few days ago and no sign of compressor surge at all despite what all the calcs say. I can only assume that the surge line on the T76 map is shown higher up the airflow range then it really is.

I got 380rwkw at 19psi and I will install a Pierburg 1000hp fuel pump, bigger fuel lines and Bosch filter before turning boost up to 23-24 psi on pump gas. Should be good for 420-430rwkw then. The goal is 450rwkw at that boost level on pump gas and I have intercooler plumbing, custom intake manifold, 80mm throttle body and bigger exhaust pipes and downpipe mods yet to do, so hopefully I'll achieve that goal.

Glad you are happy with the performance of the unit so far. Keep us posted as you keep going!