Hi guys.
My little Apexi turbo is running out of steam at top end. I'm getting 252whp and 180lb/ft at about 8psi. I'm looking for a little bit more - possibly 275whp. I'm using a stock b16 block, so don't want to go much higher than this.

I'm thinking about changing to a Garrett GT28R - It's the turbo that comes stock with some Nissan Silvias. (Not the GT28RS)

I'm wondering if anyone has used this turbo. Will it get me a bit more than 252whp?

Thanks.

 

I was able to acheive 300 whp / 300 ft-lbs with my stock LS at about 21 lbs of boost. It would taper down to about 19. I imagine it might work out pretty good for the smaller displacement of the B16.

 

Thanks for the reply. Did you get these numbers using the GT28R?

 

No. He got those numbers from a Disco Potato (GT2860RS), not a GT28R.

You'll actually make less power with a GT28R than your RX Apex'i turbocharger.

Give us more information in terms of your purpose and goals of the car (as well as power levels) to determine what smaller framed turbo is a better choice.

 

Difference between the twos' airflow being the height in islands on the compressor map, am I right?

 

I've made 290WHP on a GT28R (707160-5) at 17-18psi on my dohc zc! you'll reach a bit more on your b series for sure!

 

Different dynos man, different dynos

 

Yeap! I know that but at least, it's a bit of information about power on gt28s!

 

No Mac, it was in fact a GT28R or GT2560R.

This exact one: Garrett GT2560R (aka GT28R) Ball Bearing Turbo : atpturbo.com

 

GTFOH!! You used an actual GT28R/GT2560R to do that?!?!? I'm actually impressed. Boy, is my face red!

 

Well, it was a ball bearing gt28 to be fair. I dunno if the journal is efficient enough at higher boost levels.

 

Yeah it was the perfect autocross/dd turbo

 

i had a 28rs on my b16 and made 290/190 at 9psi.

definitely use the .63 back housing if youre going to t3 hot side

if you stay t25 hot side .86 should be ok from what convos ive had with Mac way back