Penguinracer

I was wondering if anyone can advise me if the Tial turbine housing for the Garrett GTs is a better option than the Garrett housing. Obviously the Tial V-band inlet makes positioning and fitting easier than a T3 or T4 inlet.

The Garrett housing is a ported shroud type - does this make it more surge-resistant than the Tial?

The Tial is stainless steel & seems to have a very smooth internal finish - so will it flow any better than the Garrett.?

Tim

mclarenno9

I would say the outlet v-band does more for you in terms of easy positioning and fitting of the downpipe. On the inlet, yes, its one less variable you need to worry about when modding the crossover (no need to ensure bolt holes line up). Having said that, a 4-bolt flange is more tolerant to misalignment and can be pulled mostly flat when fastened, whereas your alignment with the v-bands needs to be spot on or you will have leaks. Luckily the Tial v-band flanges are well designed and have a male/female design which helps with axial alignment, but there is a limit to how much angular misalignment the clamp will be able to correct for. In any case, make sure you tighten the v-band clamp first and then do the headers for the best shot at no leaks.

For maintenance you can't beat the ease of assembly/disassembly of the v-bands.

You are talking about compressor covers here, which the Tial housings are not. Any difference in surge resistance will be down to how closely the effective A/R's of the Tial/Garrett turbine housings match.

The general consensus with this was they seem to flow the same (produce similar HP numbers). The Tial does look nicer (and keeps looking good) compared to the iron housings but the main benefit (other than the flanges) is that it's much lighter and smaller compared to the Garretts.