apex borg turbo's
seems like a good deal I have ben thinking about an upgrade from my tc78 and seen there s474 billit t4 turbo.
it is a 74-101 mm compresser billit 11 blade
77.5-87 turbine
t4
any feedback will be appreciated.
It seems they take older BW units and rebuild them. They're probably getting them for next to nothing and rebuilding them before slapping on billet wheels and race covers and reselling them.
I have one of these billet S474s, the exact one you're looking at. The only thing I've noticed is that the center section is a good bit longer than a regular BW. Its an older center section but should get the job done.
Jay
I went from the small cast S475 1.10 T4 with the 83/74 exh wheel. To the 7 blade billet S476 Apex, 1.25AR 86/77 exh. wheel.
I picked up 5ish mph at the same boost level. With no other changes. The cast S475 stopped making big gains on my 5.3 setup over 23ish psi. The Apex unit made big gains up to 25ish lbs. Never turned it up past there.
I think their billet 11 blade "S474" (74.5mm compressor, just like the cast “S475”) would be the unit to try for 4.8/5.3 guys. It has the larger compressor housing we are used to seeing on the S400 based turbos along with the larger 77/87 wheel and 1.25 T4 housing option. HPranch picked one of these up but unfortunately wrecked the car just after install. I’d really like to see how one of these performs on the baby LS engines.
Couple things to note/watch out for…
I found some polishing compound behind the silencer ring that had a few metal shavings stuck in it from when the housing was machined.
Removing the compressor silencer ring was a bastard. The steel pins have to be drilled out of the alum. housing. I ended up with larger holes than I wanted drilling these out by hand. (I’d suggest a drill press)
They require a deep threaded fitting on the oil feed. Standard depth fittings leaked on mine initially. When I mentioned this to Apex, they sent me the correct fitting free of charge.
http://www.ebay.com/itm/Borg-Warner-...-/221631393796
I'd like to see someone try their Garrett GTA50 billet 83mm on a 6.0 too... I'm told he can get a 1.29AR T6 for it as well.
http://www.ebay.com/itm/Garrett-Turb...-/221627018435
Last edited by Forcefed86; Dec 11, 2014 at 11:44 AM.
There are much better quality units out there.... I can have you a unit built with the same compact compressor cover they offer and there wont be any questions about its performance and machining quality.
There are much better quality units out there.... I can have you a unit built with the same compact compressor cover they offer and there wont be any questions about its performance and machining quality.
Are there better performing units out there at a competitive price though?
Nearest I can tell the small cast S475 with a T4 is $850+shipping. This unit was $900 shipped and I gained roughly 5mph over the cast unit with no other changes made. IMO that's a healthy gain. If I had to pick between the two I'd go wiht the Apex unit. Which is not to say a better (more expensive) turbo wouldn't have gained more...
Last edited by Forcefed86; Dec 11, 2014 at 12:44 PM.
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I always pop off the housings off and look things over. You could have found and cleaned the debris out of it without removing the silencer ring. It’s purpose is to quiet down the turbo. I could have left it on but I like the turbo “whine”. It wouldn’t be an issue on the larger covers, they do not have the silencer ring.
Here are pics of mine with and without the ring. you can see the drilled out holes on the lower picture.

Last edited by Forcefed86; Dec 11, 2014 at 05:20 PM.










