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New Internal Gated T3 Housings.

simpletool

By simpletool,
in Engines & Forced Induction

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Cubes Grand Master

Cubes

Posted
Posted

3lit3 32,

They also have the .63, .82 internal gate now also. ;)

Have a look through the thread, disco posted a few pics of the .82 and skinny .63 internal gate gt35r turbine housings. He grabbed the pics from GCG.

http://www.skylinesaustralia.com/forums/in...=134033&hl=

GT35r .63

and the .63 int wastegate

GT35R .82

and the .82 int wastegate

Unsure if the int gate gt30's turbine housings from 'garrett' are floating around yet or not.

The Dan Grand Master

The Dan

Posted
Posted
3lit3 32,

They also have the .63, .82 internal gate now also. ;)

Have a look through the thread, disco posted a few pics of the .82 and skinny .63 internal gate gt35r turbine housings. He grabbed the pics from GCG.

GT35r .63

and the .63 int wastegate

GT35R .82

and the .82 int wastegate

Unsure if the int gate gt30's turbine housings from 'garrett' are floating around yet or not.

Yeah I know all the different models available, my rep showed me all samples the day the turbo was available. They are a great setup but you still have to go to the trouble of changing the dump, oil and water hoses and intake. The only difference is you save money on not having to buy an external wastegate. They are limited in their flow and response due to the internal gated setup but make for a great upgrade on the 25's. Definately wouldn't recommend one of these on a 20 unless you have some major port work and other head work done.

If anyone is chasing one of these turbo, let me know. I should be able to beat anyone's price.

Cubes Grand Master

Cubes

Posted
Posted

How does internal gate reduce response?

dangerman4's gt35r appears to be doing quite well on his rb25 with an auto sitting behind it. Spools damn well, considerably better than I expected. We saw 5psi at 3000rpm and its all in by 4200rpm!!

But yes the GT30 is the limit for the RB20 I feel.. GT35r is simply too big.

discopotato03 Grand Master

discopotato03

Posted
Posted (edited)

I imagine the only way any waste gate could affect the spool phase is it were not sealed shut . All the exhaust gas needs to be going through the turbine at this stage to get it up to speed .

How well the IW performs I don't know , it seems obvious that the lower the exhaust housing AR the sooner boost pressure should reach the actuators opening pressure and open the valve (assumes all else engine wise being equal ) .

The XR6's turbo actually used a smaller series ie TO4E rather than TO4S comp cover/backplate probably because Ford wanted to artificially limit how much air the compressor could pump and make the waste gate regulator (actuator) very sensitive . It was after all a low boost OEM application .

So they use a large exhaust housing AR (1.06) and a smaller series comp cover in only .50AR to limit airflow . Under these conditions the IW seemed to work ok on a 4L six .

As I've said in the past I would not use the .63AR exhaust housing on a GT3076R or a GT3582R because the exhaust restriction , once it gets going , eventually cancells out the advantage of the high flowing large trim compressors in both cases . Some unique cases such as the real GT3071R would be ok with a 63 housing but thats because they use a smaller (71mm vs 76mm) compressor and need the revs (turbo) to make them work .

Also you may never see them but bush bearing Garrett GT turbos such as the GT3571 and GT3576 may end up with them though diesel app generally like larger exhaust housing AR's .

The way I see it the limitation of most production waste gates is trying to get the exhaust gas to turn 90 degrees and bugger off out through the hole in the side of the housing . The higher the gas speed is

the less it wants to know about doing the exit stage left . Corky Bell talks about the same sort of thing in the exhaust manifold section of his book Maximum Boost though thats to do with Ext gate placement on manifolds . If you can size your turbo right ideally the waste gate is only bleeding off enough exhaust gas to regulate the turbine /compressor speed to maintain a set boost pressure . If your engine breathes properly the boost pressure may not need to be super high and the exhaust manifold pressure should also be lower and the velocity also so the integral gate stands a much better chance of controlling it .

Cheers A .

Edited by discopotato03

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