Turbo sizing...

slowA4 · Tweet this Post! #1 (**permalink**) 02-15-2008, 10:19 AM

HI, name's Kevin, i've been lurking around here looking for a while, trying to dechiper the sizing needed on a T'netic's turbo.

I've been running a Garrett GT2871R on my 98 A4 for the last year and 300wheel isn't enough. Looking at my options from Garrett i have decided to try and find something new, most Audi guys run the gt series and are content following the herd, not me so i need some help.

I know my goals, 420 awhp (580 chp) w/ decent boost by 3800. It's a 1.8T running WMI, full 3inch exhaust with a T3 flange, Intercooled with a built lower end still at 9.1: CR

I can attach a current dyno if it helps, I've noticed alot of guys with ALOT of usefull information to give out. Any help would be fantastic, options, suggestions, tips on reading the application chart? (I looked through it and noticed it was at less then 10psi, what about higher, I.E. 1

thanks in advance, Kevin.

Robert · Tweet this Post! #2 (**permalink**) 02-15-2008, 11:23 AM

Quote:

Originally Posted by slowA4

HI, name's Kevin, i've been lurking around here looking for a while, trying to dechiper the sizing needed on a T'netic's turbo.

I've been running a Garrett GT2871R on my 98 A4 for the last year and 300wheel isn't enough. Looking at my options from Garrett i have decided to try and find something new, most Audi guys run the gt series and are content following the herd, not me so i need some help.

I know my goals, 420 awhp (580 chp) w/ decent boost by 3800. It's a 1.8T running WMI, full 3inch exhaust with a T3 flange, Intercooled with a built lower end still at 9.1: CR

I can attach a current dyno if it helps, I've noticed alot of guys with ALOT of usefull information to give out. Any help would be fantastic, options, suggestions, tips on reading the application chart? (I looked through it and noticed it was at less then 10psi, what about higher, I.E. 1

thanks in advance, Kevin.

Well there are several options out there to use. Being that you are working with 1.8 L we'll have to keep an eye on the turbine size to make sure you can spool the unit up decently. Off hand I'd say something like a GT-K 500 would work well but my concern is with the turbine section. Typically I try to keep F1 T3 Stage 3 turbines for motors of 2.0L or more but you may get away with it based on your exhaust air flow on your motor. The GT-K 500 uses a GTK61 compressor wheel (good for 57 lb/min+ of air flow) and a F1 T3 Stage 3 turbine. Typically it only comes with a .63 A/R turbine housing which may be a bit too big for your set up. The other option is a GT-K 450. It uses the same F1 T3 Stage 3 turbine section but a slightly smaller T04E 60 trim compressor. Either unit is capable of more then 52 lb/min of air but obviously the GTK 61 compressor wheel has a higher peak flow. The GT-K 500 can be mostly compared to a GT35R turbo from Garrett except the GT-K 500 has a higher peak flow, better efficiency, and has surge porting on the compressor cover along with a ceramic coated turbine housing. The other option is a mix and match scenario. You could run a 60-1 or GTK61 compressor wheel with a F1 T3 Stage 2 turbine which is probably more appropriate for your displacement but you wouldn't have the advantage of surge porting. If tyou want to talk live about your options I would recommend giving Ed or Steve a call at 805-581-0333. Hope that helps.

slowA4 · Tweet this Post! #3 (**permalink**) 02-15-2008, 11:33 AM

Helps tremdously, few questions i have (Understanding that all motors are different) Any idea on spool time I.E. when it might come in?

Robert · Tweet this Post! #4 (**permalink**) 02-15-2008, 11:57 AM

Quote:

Originally Posted by slowA4

Helps tremdously, few questions i have (Understanding that all motors are different) Any idea on spool time I.E. when it might come in?

it's going to depend largely on the turbine size you end up with. If you were to utilize an F1 T3 Stage 2 turbine I would think your spool up time would be very similar to what you have now with the GT28xx turbine section. Of course A/R selection is going to be key here. A properlly sized A/R with a Stage 3 T3 will be a bit slower but it shouldn't be anything drastic.