85 lwb turbo 5.3 build - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68GMCCustom · 10-31-2012, 07:06 PM

IIRC most guys that run boost are running in speed density instead of using a MAF?

85burb · 10-31-2012, 08:22 PM

I know the guys running big boost like over 1000hp dont. Sounds cheaper to me. Not sure about the operating system or what not. Open loop though it kinda weard. Dont cars run better in closed loop cause they use all the motors sensors to figure the fuel and spark tables? I would asume anyone that can tune the motor can turn that on and off? What about mail order tunes? Are they worth the money?

clinebarger · 11-01-2012, 12:08 AM

85burb, Is that the truck with the TH375?? Good trans for a boosted truck.

85burb · 11-01-2012, 12:13 AM

Quote:

Originally Posted by clinebarger

85burb, Is that the truck with the TH375?? Good trans for a boosted truck.

Yes it is. I need to have it built. Would a 400 be better or just have the 375 built?

clinebarger · 11-01-2012, 12:41 AM

Quote:

Originally Posted by 85burb

Yes it is. I need to have it built. Would a 400 be better or just have the 375 built?

Build the TH375, The only "weaker" part is the output shaft, Breaking it would still be a badge of honor

85burb · 11-01-2012, 05:50 PM

Well comp turbo was the first to email me back. They recommended a ct43-6767 with a .91 Ar. So I called them and talked with Justin. I asked why the web site says that turbo is 975 hp rated. He says that is with the turbo maxed out. He says he recommends that one cause it will not be maxed out there for my temps will be a lot lower. He said I will only need about 7-8 psi to make 550-600 at wheels. The turbo is way more then I was thinking on spending but it will have power left in it if I was to add more boost. He also said it has a one year warrienty and can be sent back and have a 80 size wheel put on it. It will come with a billet compressor wheel and ball bearings. Still waiting on a few more places to email me back. So still not sure on the turbo
Posted via Mobile Device

clinebarger · 11-01-2012, 09:24 PM

Quote:

Originally Posted by 85burb

I know the guys running big boost like over 1000hp dont. Sounds cheaper to me. Not sure about the operating system or what not. Open loop though it kinda weard. Dont cars run better in closed loop cause they use all the motors sensors to figure the fuel and spark tables? I would asume anyone that can tune the motor can turn that on and off? What about mail order tunes? Are they worth the money?

Part throttle Closed loop Speed density tuning is still optional.
At WOT they enter open loop anyway.

10-31-2012, 07:06 PM	#1
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: 85 lwb turbo 5.3 build IIRC most guys that run boost are running in speed density instead of using a MAF? __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

10-31-2012, 08:22 PM	#2
85burb Registered User Join Date: Dec 2009 Location: lindale,tx Posts: 2,373	Re: 85 lwb turbo 5.3 build I know the guys running big boost like over 1000hp dont. Sounds cheaper to me. Not sure about the operating system or what not. Open loop though it kinda weard. Dont cars run better in closed loop cause they use all the motors sensors to figure the fuel and spark tables? I would asume anyone that can tune the motor can turn that on and off? What about mail order tunes? Are they worth the money? __________________ 82 c10 5.3/4l60 84 c20 5.3/sm465 85 chevy k10 suburban LQ4/4l60 91 chevy c10 suburban Lsa 5.3/4l60 2017 Silverado whipple 5.3 1964 Vw beetle 1974 vw beetle

11-01-2012, 12:08 AM	#3
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: 85 lwb turbo 5.3 build 85burb, Is that the truck with the TH375?? Good trans for a boosted truck.

11-01-2012, 05:50 PM	#6
85burb Registered User Join Date: Dec 2009 Location: lindale,tx Posts: 2,373	Re: 85 lwb turbo 5.3 build Well comp turbo was the first to email me back. They recommended a ct43-6767 with a .91 Ar. So I called them and talked with Justin. I asked why the web site says that turbo is 975 hp rated. He says that is with the turbo maxed out. He says he recommends that one cause it will not be maxed out there for my temps will be a lot lower. He said I will only need about 7-8 psi to make 550-600 at wheels. The turbo is way more then I was thinking on spending but it will have power left in it if I was to add more boost. He also said it has a one year warrienty and can be sent back and have a 80 size wheel put on it. It will come with a billet compressor wheel and ball bearings. Still waiting on a few more places to email me back. So still not sure on the turbo Posted via Mobile Device __________________ 82 c10 5.3/4l60 84 c20 5.3/sm465 85 chevy k10 suburban LQ4/4l60 91 chevy c10 suburban Lsa 5.3/4l60 2017 Silverado whipple 5.3 1964 Vw beetle 1974 vw beetle



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