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Old 12-31-2009, 02:12 PM   #11 (permalink)
T_F_E
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I think that holding 6 psi going down the highway will hurt you fuel mileage.

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1984 M1009 6.2 built and turboed--SOLD
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Old 12-31-2009, 09:18 PM   #12 (permalink)
cbr600rx7
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I dont see how it would hurt your fuel mileage. Your not adding any more fuel and your making more power at a lower rpm reducing the need to steep on the gas more or down shift. In fact you may even use less fuel.

I played around a little more with it today and now have the truck peaking at about 11 psi and holding about 9 and you can fill a huge diffrence in power when in OD on the highway.

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1994 F350 4x4 ZF-5 7.3 IDI Turbo. (SOLD AND NOT LOOKING BACK)
1993 ext cab 3500 4x4 6.5TD 360,000 (SOLD)
1985 K10 6.2 banks TD (SOLD)
2000 Turbocharged WS6 TA 524rwhp 498Torque (SOLD)
2001 LQ9 IRON 409, T56, 9 inch, 471rwhp 450Torque (SOLD)
2005 GSXR-1300 (SOLD)
2002 2500HD LB7 4x4 (PPE valve, MBRP 4 inch, AFE stage 2, Profab horn, EFI live) (SOLD)
2002 3500 DRW LB7 4X4 ZF6
1985 Toyota PU 4x4, Solid axle, 35 MT's, duel lockers, 5 speed.

Last edited by cbr600rx7; 12-31-2009 at 09:20 PM.
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Old 01-01-2010, 02:01 AM   #13 (permalink)
3500 sierra
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make sure to watch your exhost gas temp. I just blew a hole through a piston in my 93' due to over boosting my engine, which helps couse more heat, there for melting the pistion down. if you dont have a pyrometer, i would highly recomend one. You should never run the truck with a exhost gas temp of over 1200-1250 deg. if it goes up over that get off the gas untill it drops down.
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Old 01-01-2010, 11:38 AM   #14 (permalink)
RCpullerdude
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Quote:
Originally Posted by T_F_E View Post
I think that holding 6 psi going down the highway will hurt you fuel mileage.
Quote:
Originally Posted by cbr600rx7 View Post
I dont see how it would hurt your fuel mileage. Your not adding any more fuel and your making more power at a lower rpm reducing the need to steep on the gas more or down shift. In fact you may even use less fuel.

I played around a little more with it today and now have the truck peaking at about 11 psi and holding about 9 and you can fill a huge diffrence in power when in OD on the highway.

He's right. You don't want any more than 2-5 PSI cruising empty. More than that causes un-needed drive pressure which takes more power to push out of the cylinders. Thus, you're increasing your parasitic losses of scavenging, so it takes more power to just spin the engine, increasing fuel consumption. It is for this reason that the stock 94+ vacuum system dumps boost when cruising. This is why many people have reported a loss in economy when going from the vacuum system to the TM. It is also part of the reason that I'm keeping the vacuum system and not going to a turbomaster. You're running far too much boost for running empty cruising, but unfortunatly, depending on spring, it may be the only way to get your max boost. This is another reason I like the stock 94+ system.

Excellent work on the controller though. It's something that I think has been needed for some time, making an adjustable wastegate actuator from a stock 92-93 actuator.
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Last edited by RCpullerdude; 01-01-2010 at 11:47 AM.
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Old 01-01-2010, 02:48 PM   #15 (permalink)
cbr600rx7
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Thanks for the advice. I plan on doing a little more testing today and finish getting it set.
__________________
1994 F350 4x4 ZF-5 7.3 IDI Turbo. (SOLD AND NOT LOOKING BACK)
1993 ext cab 3500 4x4 6.5TD 360,000 (SOLD)
1985 K10 6.2 banks TD (SOLD)
2000 Turbocharged WS6 TA 524rwhp 498Torque (SOLD)
2001 LQ9 IRON 409, T56, 9 inch, 471rwhp 450Torque (SOLD)
2005 GSXR-1300 (SOLD)
2002 2500HD LB7 4x4 (PPE valve, MBRP 4 inch, AFE stage 2, Profab horn, EFI live) (SOLD)
2002 3500 DRW LB7 4X4 ZF6
1985 Toyota PU 4x4, Solid axle, 35 MT's, duel lockers, 5 speed.
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Old 01-02-2010, 12:11 AM   #16 (permalink)
cbr600rx7
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Did a little more testing today and turned the nut back about 2 full turns. The truck is boosting right around 4 psi at 65 MPH. She is peaking around 10 and holding about 7-8 psi at WOT. During normal driving i dont see any thing over 6 psi. I have driven about 60 miles like this today and didnt notice any loss in MPG.

I did a little off road testing as well and i can say i am very happy with this little mod.
__________________
1994 F350 4x4 ZF-5 7.3 IDI Turbo. (SOLD AND NOT LOOKING BACK)
1993 ext cab 3500 4x4 6.5TD 360,000 (SOLD)
1985 K10 6.2 banks TD (SOLD)
2000 Turbocharged WS6 TA 524rwhp 498Torque (SOLD)
2001 LQ9 IRON 409, T56, 9 inch, 471rwhp 450Torque (SOLD)
2005 GSXR-1300 (SOLD)
2002 2500HD LB7 4x4 (PPE valve, MBRP 4 inch, AFE stage 2, Profab horn, EFI live) (SOLD)
2002 3500 DRW LB7 4X4 ZF6
1985 Toyota PU 4x4, Solid axle, 35 MT's, duel lockers, 5 speed.

Last edited by cbr600rx7; 01-02-2010 at 12:12 AM.
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Old 01-02-2010, 12:12 AM   #17 (permalink)
T_F_E
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Quote:
Originally Posted by cbr600rx7 View Post
Did a little more testing today and turned the nut back about 2 full turns. The truck is boosting right around 4 psi at 65 MPH. She is peaking around 10 and holding about 8 at WOT. During normal driving i dont see any thing over 6 psi. I have driven about 60 miles like this today and didnt notice any loss in MPG.

I did a little off road testing as well and i can say i am very happy with this little mod.

Yup that's exactly where my turbo is tuned.
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1984 M1009 6.2 built and turboed--SOLD
2004 lb7 airdog 150, efi live


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Old 01-02-2010, 12:45 AM   #18 (permalink)
cbr600rx7
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You can see in this pic where we taped the upper manifold for the boost line. I wrapped the line in black electric tape to add some extra protection and not make the line stand out so much.


And here is a better pic of the finished controller
__________________
1994 F350 4x4 ZF-5 7.3 IDI Turbo. (SOLD AND NOT LOOKING BACK)
1993 ext cab 3500 4x4 6.5TD 360,000 (SOLD)
1985 K10 6.2 banks TD (SOLD)
2000 Turbocharged WS6 TA 524rwhp 498Torque (SOLD)
2001 LQ9 IRON 409, T56, 9 inch, 471rwhp 450Torque (SOLD)
2005 GSXR-1300 (SOLD)
2002 2500HD LB7 4x4 (PPE valve, MBRP 4 inch, AFE stage 2, Profab horn, EFI live) (SOLD)
2002 3500 DRW LB7 4X4 ZF6
1985 Toyota PU 4x4, Solid axle, 35 MT's, duel lockers, 5 speed.

Last edited by cbr600rx7; 01-02-2010 at 01:15 AM.
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Old 01-06-2010, 06:07 PM   #19 (permalink)
cbr600rx7
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Still running strong after about a week now. MPG has stayed the same so far and i have not noticed any extra oil in or around the intake or turbo.
__________________
1994 F350 4x4 ZF-5 7.3 IDI Turbo. (SOLD AND NOT LOOKING BACK)
1993 ext cab 3500 4x4 6.5TD 360,000 (SOLD)
1985 K10 6.2 banks TD (SOLD)
2000 Turbocharged WS6 TA 524rwhp 498Torque (SOLD)
2001 LQ9 IRON 409, T56, 9 inch, 471rwhp 450Torque (SOLD)
2005 GSXR-1300 (SOLD)
2002 2500HD LB7 4x4 (PPE valve, MBRP 4 inch, AFE stage 2, Profab horn, EFI live) (SOLD)
2002 3500 DRW LB7 4X4 ZF6
1985 Toyota PU 4x4, Solid axle, 35 MT's, duel lockers, 5 speed.
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Old 01-06-2010, 11:41 PM   #20 (permalink)
3500 sierra
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awsome, great work! what are you getting for mpg?

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