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Your boost gauge looks just like mine and its in the same spot!....I had to do a double take.
 

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Discussion Starter #22
LOL. Yeah it fit near perfect in there and for a little over 20 bucks the gauge works great.

I went about 100 miles of mixed driving on 1/4 of a tank. My truck is a 700R transmission with 4.10 gears and 275 tires.
 

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LOL. Yeah it fit near perfect in there and for a little over 20 bucks the gauge works great.

I went about 100 miles of mixed driving on 1/4 of a tank. My truck is a 700R transmission with 4.10 gears and 275 tires.
Should be a 4L80E unless it was swapped at one time, which would be crazy, though not impossible. 4L80E was the only auto behind the 6.5TD in a GM pickup/SUV from the factory.
 

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Discussion Starter #24 (Edited)
Hmmm maybe i read the factory option list wrong then. Its a 4 speed auto but when i was looking up some of the option numbers i must have miss read it as a 700R.
 

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Discussion Starter #25 (Edited)
Finaly got a good idea about MPG. Right now the truck is getting about 17-19 MPG in mixed driving on 4.10 gears. I have also noticed a lot more pick up during normal driving. The biggest improvement i would say is going from stop light to stop light where before the truck was making 2 pounds under light load its now making 4-5 and i dont find myself puting my foot on the floor trying to keep up with traffic any more.
 

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i have the same gauge lol and did this with a piece of all thread a lock nut and spring to my 95 just bent the all thread into a hook and hooked it in the turbo cost less than 5 buks lol
 

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i just removed the actuator and wired it fully closed. . . .gettin the gauge put in next week, wonder how much i can get out of it. only trouble i have had is when its under full load. . . .(gcvw over 25,000) it overboosts and takes away fuel
 

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Since you are now making a few more pounds of boost over stock, shouldnt you turn up the pump a flat or two? I bet you could find some kind of progressively wound or 2 seperate springs to allow you adjustment for high and low throttle.

cheap9655- If you wire the wastegate shut, all exhaust gas will be pushed through the turbine wheel and the turbo will make as much boost as it can; boost pressure will now be fuel limited. Usually one would upgrade to a much larger turbo when going to a wastegateless design
 

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If I find a older wastegate can i redo it to work on my 98 "f". Im not the brightest bulb in the room, but the picture of your 94 put the wastegate in a completely different spot than mine. I know iv read the other thread on the newer wastegate but i was just wandering that the older style seems allot easier to modifie (ie not having to search for the right spring etc.) and can i mod. an older one and use it on my engine?
 

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Quote:
Originally Posted by cbr600rx7
LOL. Yeah it fit near perfect in there and for a little over 20 bucks the gauge works great.

I went about 100 miles of mixed driving on 1/4 of a tank. My truck is a 700R transmission with 4.10 gears and 275 tires.

Should be a 4L80E unless it was swapped at one time, which would be crazy, though not impossible. 4L80E was the only auto behind the 6.5TD in a GM pickup/SUV from the factory.


if his truck is a 93, its mechanical, and those indeed did come with a 700r4 behind them, no electronics for the 4l80 to talk to so they put in the 700r4.
i used to have one, and when taking her very easy down the highway i would get extremely good mileage, as she was only spinning at 1400 rpm at 65mph, like 25mpg or better.
 

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Quote:
Originally Posted by cbr600rx7
LOL. Yeah it fit near perfect in there and for a little over 20 bucks the gauge works great.

I went about 100 miles of mixed driving on 1/4 of a tank. My truck is a 700R transmission with 4.10 gears and 275 tires.

Should be a 4L80E unless it was swapped at one time, which would be crazy, though not impossible. 4L80E was the only auto behind the 6.5TD in a GM pickup/SUV from the factory.


if his truck is a 93, its mechanical, and those indeed did come with a 700r4 behind them, no electronics for the 4l80 to talk to so they put in the 700r4.
i used to have one, and when taking her very easy down the highway i would get extremely good mileage, as she was only spinning at 1400 rpm at 65mph, like 25mpg or better.
Even the 92 and 93 had the 4L80E. The 4L80E was the only auto put behind the 6.5TD in GM pickups (light vans too, to the best of my knowledge). The 4L80E came out in 91, and was even behind certain late 6.2's. In the mechanical Diesel applications, it had a stand alone TCM and a TPS on the IP and an RPM signal from the oil pump drive (combined with the vacuum pump on crew cabs and Suburbans in 91). No need for any communication with the engine. The 700R4/4L60/4L60E wasn't offered behind the 6.5TD because it wasn't strong enough. It was, however, found behind NA 6.5's.
 

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Quote:
Originally Posted by cbr600rx7
LOL. Yeah it fit near perfect in there and for a little over 20 bucks the gauge works great.

I went about 100 miles of mixed driving on 1/4 of a tank. My truck is a 700R transmission with 4.10 gears and 275 tires.

Should be a 4L80E unless it was swapped at one time, which would be crazy, though not impossible. 4L80E was the only auto behind the 6.5TD in a GM pickup/SUV from the factory.


if his truck is a 93, its mechanical, and those indeed did come with a 700r4 behind them, no electronics for the 4l80 to talk to so they put in the 700r4.
i used to have one, and when taking her very easy down the highway i would get extremely good mileage, as she was only spinning at 1400 rpm at 65mph, like 25mpg or better.
92/93 did come with the 4L80E. There was a standalone TCM that controlled the trans. YOu can buy a standalone controller which will allow you to put the 4L80E behind anything that it'll bolt up to more or less.
 

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My '93 has a 4L80E and thank goodness! The R4 would never hold up to what I have put mine through!
 

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i just removed the actuator and wired it fully closed. . . .gettin the gauge put in next week, wonder how much i can get out of it. only trouble i have had is when its under full load. . . .(gcvw over 25,000) it overboosts and takes away fuel
Mine was stuck closed when I got the truck, and when it freed itself up I took it off and wired it shut the next day. Been that way for about 40k miles now. Averaging 16mpg solo with a personal best of 18 (600 miles on one tank!). Only get about 10 when pulling the 12klb travel trailer though. My wife says that I am anal about my mpg, as I check it every time I fill up! :D
 

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So what would be the Max boost that a 96's turbo would put put under a load if the wastegate was wired shut? Has anyone made a aftermarket electronic controller to control the stock Vac-solenoid?
 

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Hey I've also got the 93 mechanical 6.5 with the spring actuator on the wastegate. I'm curious if my wastegate is working correctly, I know the spring is good because i took it off and checked it but the wastegate never moves when reving the engine. Should I be able to see it move when reving the engine or does it need a load? Also I have very little power at RPM below 2000. Can barely take off uphill. I think it's a fuel pressure problem but i'm curious what the closed wastegate could do.
 

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X2, it needs a load to build up enough boost to overcome the spring pressure.
 
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