tdo6h4 or tdo6sl2 using the tdo5h cover?

[TSIfreek]

What turbine would be the best using the tdo5h cover and a 20g wheel and a 8cm turbine housing? Im almost dead set on the sl2 as it will have more useable power and fit the tiny cover better with the 20g wheel? The tdo6h4 is a big wheel with a bigger shaft so my feeling is I wont get the performance im looking for it will be more lagy but may make more power.
My shift point will be around 8k and is a drag build. External gate off the 02.
Thanks for all your input as im just looking for the pros and cons of each wheel.

 

[JusMX141]

Your compressor wheel could care less what cover it's behind as long as the wheel fits the shroud. Of course there are limitations- most of which deal with the compressor inducer being larger than the inlet of the cover.

Choose a turbine that suits your power needs and is proven to perform when paired with whatever compressor wheel you're using.

 

[TSIfreek]

Thanks Justin
I was a little confused with the tiny compressor cover.. Will eather wheel work better with that cover? Or is it just were I want my power band to be to choose what wheel to go with. Will the 6hr4 have any surging issues?

 

[gimmie11s]

Im runnning exactly what you describe. Billet 20g wheel bolted to a 06h4 in an FP 8cm housing with stock compressor cover.... wastegate off the o2.

The top end is HUGE. But lag is definitely there. I get full boost (23 psi at the moment) at 4200 rpm. This is on a fresh 9:1 6 bolt motor with stock 1g cams and a small port 2g head and intake.

 

[donniekak]

Im runnning exactly what you describe. Billet 20g wheel bolted to a 06h4 in an FP 8cm housing with stock compressor cover.... wastegate off the o2.

The top end is HUGE. But lag is definitely there. I get full boost (23 psi at the moment) at 4200 rpm. This is on a fresh 9:1 6 bolt motor with stock 1g cams and a small port 2g head and intake.

I have a cast 20g compressor mated to a td06h4 turbine in a 7cm housing. I hit full boost around 4000ish in higher gears with comp 272's, and a stock bottom end. What I have noticed is the boost recovery after shifting feels faster that a td05h 20g. Maybe the larger turbine takes longer to slow down, so it doesn't have to regain so many rpms on re spool.