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Old 08-12-2013, 01:21 PM   #57
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Originally Posted by SSE 4 2SS View Post
My biggest problem with the 67/66's is cubic inches... they will handle pretty much whatever you throw at them up to about 3.1 liters per turbo... I was throwing 3.5 liters plus worth of exhaust at each of them with my 429 ci motor... If you are factory cubes, go for it... here is a size difference we are dealing with.... this is the 67/66 we had in my car, and the 76/75's we are installing.... All new manifolds, hand fabricated, heavy wall stainless, new substantially larger intercooler etc... These turbos sit next to the bell housing right off the manifold collectors.

The new turbos have an "H" cover and T4 hot side. The compressor housing has a .96 a/r ratio. These are ball bearing turbo's with a mid frame center section.... and CEA wheels...
Robert, any issue with the fitment of the 6766 units. Any issue with hanging below the frame etc? I think these are the units im going to go with. Hell my shop says they are overkill and the 6266 units would be better for my goals. Im sticking with the 6766s for future growth. Im looking for 18 psi and about 1000-1100whp. And from my research, these should do nicely.

Im not running the mile like you but just an occasional 2.5 mile road course track day a few times a year. I am primarily concerned about the turbos hanging below my frame since my car is pretty low with 19" wheels and the Pedders stuff.
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Old 08-13-2013, 11:50 AM   #58
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I would say you need a bigger turbine wheel. Nothing wrong with a 66mm compressor but you need to be able to get the gas out efficiently. I want to see someone try the new AGP 67/73s.
Well go for it and report back to us... The compressor size wasn't an issue, but the small frame shaft certainly was... We broke both turbo's in the center section due to the shaft breaking... It could be argued this was a balance issue but the first one we blew had literally hundreds of boost applications in the year it was on the car.. The second one probably had an hour of idle time and 20 seconds of boost applied. A friend that works on high level, 5 and 6 second, turbo drag cars says that if a turbo makes it a couple of passes the balance is probably fine..

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Originally Posted by BullF-16 View Post
Robert, any issue with the fitment of the 6766 units. Any issue with hanging below the frame etc? I think these are the units im going to go with. Hell my shop says they are overkill and the 6266 units would be better for my goals. Im sticking with the 6766s for future growth. Im looking for 18 psi and about 1000-1100whp. And from my research, these should do nicely.

Im not running the mile like you but just an occasional 2.5 mile road course track day a few times a year. I am primarily concerned about the turbos hanging below my frame since my car is pretty low with 19" wheels and the Pedders stuff.
My 67/66 turbos did not hang below the frame at all...We actually have a belly pan that bolts to the frame horns and its a flush fit. My turbos survived fine at 18 psi... it was when we were pushing higher that we ran into trouble... Bare in mind the 18 psi was only when the boost controller was turned on and with race fuel in the tanks... for street driving, we turn off the boost controller and run on 93 octane pump gas... This would have us around 800 rwhp on 12 lb waste gate springs...
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Old 08-13-2013, 04:58 PM   #59
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How much was it making at 25psi then ? Must have been good !
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Old 08-13-2013, 11:03 PM   #60
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How much was it making at 25psi then ? Must have been good !
Uhm, alot.... That was 25 psi and a 150 shot on top of that....
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Horsepower is how fast you hit the wall.
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Old 08-14-2013, 07:35 PM   #61
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I ended up getting the AGP TT kit with upgraded S256 turbos from Matt at FSP cant wait!
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Old 08-14-2013, 07:40 PM   #62
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Very nice. I almost bought that kit from him last night, but there is still no clear answer on what it would take to adapt it to fit a G8, so I didn't. For the price though, I almost didn't care. You got a hell of a deal. Can't wait to read about your results.
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Old 08-14-2013, 07:46 PM   #63
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Pending finding someone with a lift I can use etc.. Ill post after I get some dyno work done!
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Old 08-14-2013, 07:48 PM   #64
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I ended up getting the AGP TT kit with upgraded S256 turbos from Matt at FSP cant wait!
What's the upgrade ? Arent the S256 the base unit ?
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Old 08-14-2013, 07:51 PM   #65
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we'll be install an agp kit on a Camaro zl1 next week, this has the upgraded s261 units... ditching the blower, shooting for 800+rwhp
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Old 08-14-2013, 07:53 PM   #66
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we'll be install an agp kit on a Camaro zl1 next week, this has the upgraded s261 units... ditching the blower, shooting for 800+rwhp

Looking forward to the results !
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Old 08-14-2013, 07:55 PM   #67
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Looking forward to the results !
they'll be posted soon enough!
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Old 08-14-2013, 08:09 PM   #68
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pretty sure the standard kit comes with the s200 turbos at 51mm. The upgrade is to the s256 with 56mm. I know the s256 wont fit the auto's without some grinding. Im ls3 thankfully!
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Old 08-14-2013, 11:19 PM   #69
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Base is 51mm. 56mm are upgrade. Grinding is just rounding off one tab ear. Takes 2 minutes at most and is very minor.
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Old 08-15-2013, 10:10 AM   #70
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Yup love these kits, Blakes is on my shelf just waiting on his turbo cam, and new clutch before we start install.
Sbindley Trans Am kit is ready to rock when we get the car.
Sold one to Chicago as well for a customer to install himself.

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