Your opinion on a turbo please.

[BoBa524]

Let me know if this turbo is any good for a turbo KA

Garrett T04E68

Compressor Wheel: 55.3/81.6 mm.....Trim 46.....AR 50 (housing)

Turbine Wheel: 57.4/73.8 mm.....Trim 60.....AR 84 (housing)

Compressor Inlet: 2 3/4"

Compressor Outlet: 2"

[Chezedik]

Would probably be alright, but spool will be very slow. If you are making a drag car, you would be good, but for the street power may come on too late.

[BoBa524]

how come? i though big turbos took a while to spool is this a big turbo?

[Chezedik]

They do, if it were a hybrid then it would be spot on with what most of the guys on the board are using. But with a .84 T4 turbine, it will take forever to spool. That is why it will likely not be good for the street. But since the turbine will not inhibit exhaust flow much, you can use NOS to spool the motor, or even drop the clutch once it is spooled. So we are on the same page.

[HardcorePS13]

That is a pretty large turbo. Looks to be some sort of diesel truck turbocharger from the small trim compressor wheel and the T4 housing.

It will lag pretty hard.

[S14tat]

yeah thats what i was thinking, the compressor is pretty small and the turbine is quit big. i don't think it would be too bad ance i'm running a .69 a/r on mine and spools instantly at 50mph in 3rd gear. also mine is a on center housing, this one is a tangential so that should help a good amount.

[Chezedik]

What is the difference between on center and tangential?

[S14tat]

a on center housing means the exhuast gas goes into the turbine from the center of the housing



when a tangential housing is when the exhuast gases goes into the turbine like a tangent line on a circle.

[KATwo40]

If I could step in here...

First off, that exhaust housing is pretty large for a streetable KA. There's just not enough exhaust flow to see the spool happen before 4k RPM and WOT at that.

Second, I've mapped out the T04E .46 trim compressor for the KADE and I'll be the first to say "RUN!!!" It's a very very sucky compressor for the KADE, and most likely this rings true for the KAE. It never shows any flow actually IN the center efficiency island, but rather on the right-most line of it, and only briefly (around 3500-4000rpm). After that, it shoots to the right and by the time you see max flow (lb/min.) you're only around 5500rpm and at somewhere around 50-55% efficiency. It's HORRIBLE. This was based on a pressure ratio of 1.87 (about 12psi). Max power at that boost level would be about 220-230whp.

I seriously recommend staying away from that turbo.

Oh, on another note, the twin scroll entry design is only useful if you have a manifold that is port matched to it (i.e. two runners to one hole, two runners to the other hole). If you use a standard T3 manifold with a single opening at the flange, you'll actually suffer from flow restriction at the turbine housing entry point.

[Chezedik]

I assume there are benefits to either, so what are they?

[shockload]

the compressor is small but maybe if it were a 57 trim the turbo would work ok for running high levels of boost with lots of clutch boosting off the line and every shift. kas like to hold boost though its not a very high rpm engine and you would be happier with a hybrid turbo for sure.