Anybody running GT25, 30, 35 on their ST205 Celica?

[evltoy]

Im in the process of turning my ST205 Celica into a circuit car. Im at the stage were Im trying to decide on what turbo to use.

It will be a Garrett GT25 or 30, but I would first like to hear from someone who runs either turbos on their ST205 to get an idea of what revs they make boost at.

I think the GT30 will be the more suited but the last thing I want is the car to bog down around a tight turn or out of a corner.

If the GT30 comes in around 4 grand it will be peachy, If they come in at 5 grand it'll be a dog.

[anthonym]

Im in the process of turning my ST205 Celica into a circuit car. Im at the stage were Im trying to decide on what turbo to use.

It will be a Garrett GT25 or 30, but I would first like to hear from someone who runs either turbos on their ST205 to get an idea of what revs they make boost at.

I think the GT30 will be the more suited but the last thing I want is the car to bog down around a tight turn or out of a corner.

If the GT30 comes in around 4 grand it will be peachy, If they come in at 5 grand it'll be a dog.

All the dyno plots I have seen for the GT25 on the 3SGTE are horrible, spool up is no better than a conventional turbo (TD06 for example) and the top end is worse. There's not much data on the GT30, but IMO the response you are looking for depends more on the a/r ratio of the exhaust housing than the type of bearings. Based on experience I would suggest a turbine with a major diameter between 55 and 60mm and an a/r ratio no greater than 0.63. Depending on supporting mods this is sufficent for around 450hp; if you are looking for more than that there will be a lag trade off. The GT30 is OK in terms of turbine size, but I'm not sure there is a suitably sized housing available. I'm experimenting with one at the moment on my MR2, but I don't have any useful data to share as yet.

[dragonx]

i used a gt25 (i forget the specs on it) on an mr2 and to be honest it was pretty much exactly the same preformance as the td06 (both running around the 1 bar mark), the td06 felt like it preformed a bit better.
The gt25 didnt have the same well thought out install as the greddy unit though.

[Brrrrrrm]

The 205 I have been rebuilding was an ex cicuit racing car from japan. It has a GT3037 with 1.01 a/r intake. Should be back on the road in 1 month-jus dropping motor back in.

[Twolitre]

The 205 I have been rebuilding was an ex cicuit racing car from japan. It has a GT3037 with 1.01 a/r intake. Should be back on the road in 1 month-jus dropping motor back in.

I think you mean 1.01 exhaust housing don't you Mr Brmmm ?

[Brrrrrrm]

Doh, indeed 2 litre my bad- the intake a/r is 0.60 and exhaust is 1.01

[evltoy]

The 205 I have been rebuilding was an ex cicuit racing car from japan. It has a GT3037 with 1.01 a/r intake. Should be back on the road in 1 month-jus dropping motor back in.

Got any pics of it?

[Brrrrrrm]

Sure wots the best way to post jpgs to u!

[evltoy]

Send them to steve.peters@xtra.co.nz.

I look foward to seeing them.

[Brrrrrrm]

Done, more soon with motor back in.