Thread: T3-T2 adapter

It seems silly to me to go from a larger frame turbo to a smaller frame turbo, at the very least the flange and turbo could be ported, the spool time will improve and there will be less chance of cracking of the manifold.... I mean they are a 3.9l engine or so and 2.3l petrol engines spool at 2500rpm with a largish ported t3, so a smaller t3 should work fine I'd think?

Originally Posted by Vee_que

It seems silly to me to go from a larger frame turbo to a smaller frame turbo, at the very least the flange and turbo could be ported, the spool time will improve and there will be less chance of cracking of the manifold.... I mean they are a 3.9l engine or so and 2.3l petrol engines spool at 2500rpm with a largish ported t3, so a smaller t3 should work fine I'd think?

Flange size has no bearing on turbo spool or engine performance. All the modern turbos in this flow-range are T2 flanged. T3 is old and rare.

Originally Posted by Vee_que

It seems silly to me to go from a larger frame turbo to a smaller frame turbo, at the very least the flange and turbo could be ported, the spool time will improve and there will be less chance of cracking of the manifold.... I mean they are a 3.9l engine or so and 2.3l petrol engines spool at 2500rpm with a largish ported t3, so a smaller t3 should work fine I'd think?

That is the problem, spooling (as you call it) at 2500 rpm might be fine in a 2.3 litre petrol engine (and is similar to what we see with the 2.5 litre Land Rover Tdi and TD5. But with the 4BD1T we want it at much lower rpm - the useful torque band starts at considerably less rpm.

Dougal, do you have the bolt sizes required? Can't find your email from years ago
Finally getting stuck into the rangie again

Originally Posted by Vern

Dougal, do you have the bolt sizes required? Can't find your email from years ago
Finally getting stuck into the rangie again

Bolts are easy to work out, too long and they poke out the other side.

I'm also working on a better single piece replacement for these which I will make here. The amount of machining means they aren't cheap though.

All good dougal, I found your email and have sourced the bolts. Its now drilling and tapping time. Turbo goes on this weekend
Finally have some inspiration to get this car finished.

Originally Posted by Vern

All good dougal, I found your email and have sourced the bolts. Its now drilling and tapping time. Turbo goes on this weekend
Finally have some inspiration to get this car finished.

Did the leprechaun send you a pot of gold

Nup. But I will be needing it soon, wanna fire this thing up in a couple of weeks. But now I lay in bed with a shagged back, great start to the long weekend. No wonder I drink