Thread: Another turbo question-- or 2

Here are some pics of the stock Garrett turbo. Earlier models had a different manifold and an IHI turbo.

Originally Posted by DeeJay

If I buy the standard off the shelf unit, will I need to get the exhaust pipe modified, or does the exhaust pipe bolt up as standard to the turbo?
I cant seem to find any pics of the standard factory setup on AULRO.

Thanks,
David

As you can see in this pic, the exhaust outlet on the turbo is closer to the front of the engine and it points down, so you will need to at least modify the first bit of your exhaust.

Murray

There are several "factory" turbos.

Early high mount IHI RHB6.
Then high mount T25 with T2 flange.
Then angled mount T25 with T3 flange (no wastegate), this is pictured above.
Then angled mount T25 with T3 flange and wastegated. Mainly found on the 4BD2T.

I haven't found anyone who can give me some good numbers on the factory non-wastegated T25 shown above. Sure I have one in my parts bin, but I have other turbos I'd rather fit.
Specifically, I'd like to know how many rpm until it delivers 10psi at full load (like up a hill with foot down). Given it's large A/R exhaust housing, I think it'll be at a higher rpm than most of us would like.

Isuzurover has fitted my adapter design and T28 to his county. He has pictures in a thread here.

Originally Posted by rijidij

As you can see in this pic, the exhaust outlet on the turbo is closer to the front of the engine and it points down, so you will need to at least modify the first bit of your exhaust.

Murray

That turbo looks like it sits as high or higher than my T28 with Dougal's adaptor. That "factory" turbo has a longer/less compact turbine inlet.

The clearance from turbo to bonnet shouldn't be an issue, but the clearance when running a crossover pipe over the tappet cover is.

Originally Posted by isuzurover

The clearance from turbo to bonnet shouldn't be an issue, but the clearance when running a crossover pipe over the tappet cover is.

Hey Ben, can you tell me how far above the tappet cover your turbo is? (measured from the top of the tappet cover to the upper most point of the turbo). I've got the measurement for a high mount (60mm above, 115mm from edge of tappet cover...thanks rar110) so it'll be interesting to see how yours compares.

Originally Posted by County3.9

Hey Ben, can you tell me how far above the tappet cover your turbo is? (measured from the top of the tappet cover to the upper most point of the turbo). I've got the measurement for a high mount (60mm above, 115mm from edge of tappet cover...thanks rar110) so it'll be interesting to see how yours compares.

I think I'll go Murrays (Rigidij's) way & rout the pipe down & in front of the radiator. Maybe even an intercooler like his 1st one too.
They say impersonation is the best form of flattery

Originally Posted by County3.9

Hey Ben, can you tell me how far above the tappet cover your turbo is? (measured from the top of the tappet cover to the upper most point of the turbo). I've got the measurement for a high mount (60mm above, 115mm from edge of tappet cover...thanks rar110) so it'll be interesting to see how yours compares.

Rocker covers are one thing that have changed a bit. There seem to be at least 3 different versions.

So it would probably be better to measure from the top of the head (perhaps near an exhaust manifold bolt where the side of the rocker cover is recessed).

I have a solidworks drawing showing the factory turbo and a T25/T28 on the adapter overlaid.
Remind me to post it up later.