What to expect from a Garrett T35

[ejenner]

I bought a second-hand turbo for my 99 a while ago. I spotted it on eBay and thought it was the sort of
thing that would make the car go like I wanted it to.

The turbo is a Garrett T35. Has anyone ever used a Garrett T35 on a T16 engine before? OEM
application is Escort 4x4 Cosworth.

I've got a rebuild kit for it. It's a simple design. No wastegate. Oil cooled only.

My intended output is somewhere in the 250~300hp range but I'm wondering if this turbo is going to do
more than that? What does everyone else think?

[Alex]

Its going to require some creative effort to get that turbo to connect to a Saab downpipe. Should make 300+ as is but is rather old school in terms of the boost threshold, IIRC they don't start playing until at least 3000rpm are on the clock.

[ejenner]

That's the plan. I got a big exhaust housing so there is room for the exhaust to really move. As it's a track car I really do want the power between 3k and 6k. With the TE05 the acceleration seemed almost un-boosted as you were getting towards the top end of the rpm range. The 99 would leave almost anything coming out of a corner but it wouldn't be long before the gap started to close again. Seems to be a narrow power-band with the TE05. Maybe when you're running less boost then it's not so easy to notice that effect?

I don't have a standard downpipe anymore and I've got skills and a welder so fitting should be straight-forward. Will probably need a new flange and a couple of stainless exhaust tubes.

[philb]

Perhaps with a more aggressive ignition map it could spool quicker. From memory, the map for an 88 DI car is quite conservative. If it doesn't have a wastegate at all, how do you control the boost??

[philb]

Regarding te05 - well if you run 0.8 bar, it just about has enough capacity to hold it all the way to redline, but not if you try 1.4 bar

[Alex]

Are you going to be remapping the ignition system for the new turbo? With the reduced back pressure from having a proper space for the exhaust gas to exit into you should be able to change the ignition timing.

[scubasaab]

Love, LOVE that shot!!
Looks like an enormous chamber pot (in size mind you!)
How big is that compared to the little mill these cars normally come with?

[ejenner]

It's much bigger than a T3. The compressor housing looks fairly similar to the T3 but the entrance and exit are bored-out and I suppose there's a bigger wheel in there as well.

I won't be changing the ignition map any time soon. I'm running DI/APC and that can't be changed without a chip-burner and a software package. It has the Swedish Dynamics chip in it but I think that's simply a boost-hike and they probably didn't do anything with the ignition timing.

I've got the software for the DI+APC (the older one) but I don't think that can be used with DI/APC.

Anyway, nevermind, 300hp without trying will be fine...

Phil - in answer to your question regarding the boost control.. I have one word for you... and that is 'external'

[philb]

Er yea, I'm just being a bit slow. I suppose you can try hooking up the ewg to the egr port on the stock manifold.

I only mentioned ignition timing as you want to have a reasonably wide powerband on track, so you want to get it spooled up asap. But you can always extend the powerband, given that it won't run out of boost at high rpm any more, you could consider increasing the rev limit up to near 7000. I think you have a non-standard cam in there already..

[ejenner]

Not a very exciting cam though. SD regrind! But as they were too cheap to ignore I bought them. It was one of those situations. Being given away.

[Alex]

Without a remap that thing could end up being even lazier than when attached to a correctly mapped Scortworth.

[ejenner]

We'll see. If it's really bad then I'll do something about it.

[philb]

I don't think it will be any worse than a cosworth. They are noted for being a complete dog off boost, afaik the compression ratio is a bit lower than the T16 engine, so you should be fine.

[ejenner]

I think cosworth normally go with something like 8:1.

I've driven the 99 with a boost fault before... not so bad. You also have to drive a turbo car a particular way to get the best out of it. So nothing much will change if I switch to a turbo with more lag. Also, I'd much rather have the boost in the upper third of the range rather than the middle third... much more suitable for track use!

[Alex]

Originally Posted by philb

I don't think it will be any worse than a cosworth. They are noted for being a complete dog off boost, afaik the compression ratio is a bit lower than the T16 engine, so you should be fine.

They are a dog off boost when correctly mapped for the turbo. Things could get worse when running on a car which isn't mapped for it.

[IronJoe]

Make sure it fits in the car! My compressor housing touches the head if not clocked properly, and my distributor touched the exhaust housing until I took a notch out of the dizzy cap!

Just some things to think about... There is such a thing as too big!

[Matthew]

At least Emmett won't have to worry about the distributor - he's running DI on his 99 T16.