Pontiac GTO 2004-2006 - New APS Upgraded Turbos

I have had these in the works for a while now as some of you are well aware of :cheers:

http://www.lgmotorsports.com/catalog/product_info.php?cPath=577_346_599&products_id=2157

Cliffs notes-
New CHRAs, updated Turbine wheel, Billet ~60mm compressor wheel, flow 70lb/min each. :D :thumb:

These have the airflow to support well over 1000 rwhp, which is killer for any off the shelf kit

If you have any questions, feel free to ask :cheers:

Louis

nice! do you have to do any changes to the pipes?

Nope! Direct bolt in! Took some work but we got it to all fit :D

any word if a ball bearing turbo will be a option later?? i need these my turbo's are leaking oil already. i you dont have them instock how long will it take to get some in. any chance on a group purchase on these?

what would be the main advantage of doing this upgrade if i was stock cubes a lil bigger?

If you are not having reliability issues, MUCH more power at a LOWER boost level. These babies FLOW.

Stock MHI 20Gs flow ~ 44 lb/min. These flow ~70lb/min. Rough math teaches us that 1 lb/min =10 hp in peak efficiency. Thats 900 fwhp, these will flow 1400 fwhp, and I believe it. You will run into back pressure issues and exhaust housing flow restrictions north of 1000, but these wheels have made almost 1100 at only 18 psi where the stock wheels peaked at 20 psi, and fell to 17 by the end of a pull, and only made 800.

There you have it :)

I cant do a GP, there isnt enough margin in it at all for the number we would have to sell.

As for Ball bearing, not anytime soon. Its on my list to-do, but a year minimum, and thats pushing it...

Louis

im just wondering if i can justify putting these on a stock motor

nope, no need really IMO. :cheers:

at what point whould i think about it then?

nope, no need really IMO. :cheers:

i have a stock engine also making 637rwhp with these what do yo think it would make on the stock wastegate springs. i may get these now instead of paying for a rebuilding on these and then later on buying new turbos.

Tough to say, I picked up 50 rwhp on the springs on the last car I did, but it was a bit anemic. 346 with stock heads/intake and a 228 cam.

These turbos REALLY shine at higher Pressure ratios. THey are happy as clams at 22-24 psi, where the stock units will not support 20.

At what point would you need them? Hard to say! Im not sure how you guys drive, or what you look for.

If you are keeping it on the springs, just turn up the boost a few pounds. I ran into issues around 12-14 psi, which on a STOCK 99 ls1 on pump was 610-630 rwhp. GTOs have better heads, some LS2s, etc. They are much more efficient, so they will make more power at the same boost level.

YMMV, but its a great upgrade. My advice? Turn it up a bit and then replace as needed :D