APS Extreme Twin Turbo Build
Joined: Oct 2011
Posts: 115
Likes: 13
From: California
Thanks for helping me sort out my parts list and getting me in touch with the right people!
Registered User
iTrader: (10)
Joined: Jun 2006
Posts: 2,374
Likes: 14
From: Ladera Ranch / San Clemente
My pleasure bro! Glad to see this this beast running well!
Joined: Oct 2011
Posts: 115
Likes: 13
From: California
One of these days I might have to get that wire tuck done by the master himself 
The car is an absolute blast to drive!

The car is an absolute blast to drive!
i dont see anyone selling these extreme kits? im very interested as im doing a 4.2 GTM block with gtm twins or the extremes just having hard time finding info and sellers of the kit.
Joined: Oct 2011
Posts: 115
Likes: 13
From: California
I had the same problem finding an APS extreme kit. I got lucky and found a brand new kit for sale by a member here on driver. I guess APS pulled out of the US market as demand went down (economy?).
if you have the money for a GTM 4.2L block, you certainly dont want those tiny housed APS Extreme turbos. The gtm gt35s with the biggest A/R they have is the only appropriate match for such a big motor.
Joined: Oct 2011
Posts: 115
Likes: 13
From: California
btw my aps extremes reach target boost at 4500 rpm. when would the gtm gt35s w/biggest A/R reach target boost?
Joined: Oct 2011
Posts: 115
Likes: 13
From: California
Joined: Oct 2011
Posts: 115
Likes: 13
From: California
Car is running great! No problems whatsoever.
Even before going turbo I've always had a problem with the "sticky" clutch pedal in hot summer days. Only happens after driving around for like 30 minutes. Seems like it's happening more frequently now (poss more heat in the engine bay because of the turbos?) So I've ordered new master and slave cyl, ss clutch line, and a bottle of motul rbf 600. I'm taking more of a shotgun approach to the problem just need to find some free time to wrench on it.
Even before going turbo I've always had a problem with the "sticky" clutch pedal in hot summer days. Only happens after driving around for like 30 minutes. Seems like it's happening more frequently now (poss more heat in the engine bay because of the turbos?) So I've ordered new master and slave cyl, ss clutch line, and a bottle of motul rbf 600. I'm taking more of a shotgun approach to the problem just need to find some free time to wrench on it.
Joined: Oct 2011
Posts: 115
Likes: 13
From: California
Other members have described driving the G to that of a bucking bronco and it was the one thing that I always hated about the car...Well I finally had some free time to take care of the dreaded clutch problem. Got the new master cyl, slave cyl, SS clutch line and rbf 600 in. My initial impression after a 15 min test drive is that there is a huge improvement in clutch feel. Its a lot more linear now and predictable. BUT...the true test will be how it holds up in stop and go traffic in the heat.

On to some other FI related issues. I found that the A/C compressor was rubbing against the lower radiator hose. I discovered this when I went out to the car one day and found a puddle of coolant under the car.


That was an easy enough fix with putting in a new hose and tying it down to the turbo compressor outlet duct. Hopefully it won't wiggle its way back to the A/C compressor.
Also discovered an oil leak. I've been keeping an eye on the oil level and didn't see any drop in the level but I found the leak when I was under the car. After wiping everything down and running the car in the garage I was able to trace it to the driver side turbo oil return. I guess the supplied hose clamp just wasn't doing the trick.


Its not the greatest picture but you can see the oil starting to seep under the heat wrap that was placed over the hose clamp.
Other than these very minor issues the car continues to run great and I've put nearly 3,000 miles on it. Will be changing the oil very soon here.

On to some other FI related issues. I found that the A/C compressor was rubbing against the lower radiator hose. I discovered this when I went out to the car one day and found a puddle of coolant under the car.


That was an easy enough fix with putting in a new hose and tying it down to the turbo compressor outlet duct. Hopefully it won't wiggle its way back to the A/C compressor.
Also discovered an oil leak. I've been keeping an eye on the oil level and didn't see any drop in the level but I found the leak when I was under the car. After wiping everything down and running the car in the garage I was able to trace it to the driver side turbo oil return. I guess the supplied hose clamp just wasn't doing the trick.


Its not the greatest picture but you can see the oil starting to seep under the heat wrap that was placed over the hose clamp.
Other than these very minor issues the car continues to run great and I've put nearly 3,000 miles on it. Will be changing the oil very soon here.


