1990 Dodge Dakota Turbo Build - Page 3 - Turbo Dodge Forums : Turbo Dodge Forum for Turbo Mopars, Shelbys, Dodge Daytona, Dodge SRT-4, Chrysler PT Cruiser, Omni and more!
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post #31 of 80 Old 12-15-2017, 08:24 PM Thread Starter
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Re: 1990 Dodge Dakota Turbo Build

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Originally Posted by land View Post
no expert here, but they look like a 1992 2.5 t1 I just tore down......I think the early turbo piston had a smaller dia. dish, but maybe same depth??

Quote:
Originally Posted by ILIKESHELBYS View Post
i THINK THIS IS A GREAT BUILD AND i ENJOY WATCHING THIS THING COME TOGETHER. i WONDERED ABOUT YOUR PISTONS. aRE THOSE FLAT TOP PISTONS.

oOoOpS CAPS LOCK.

I cant tell if they are early turbo style and dished or not. But NA style pistons forged or other would not be good for the turbo configuration. But I am as wella s others may be interested to know whos pistons you opted in for: Venolia, Wiseco, other?
They aren't a flat top. I had pistons made by JE for the 2.5. They have a slight dish and valve cutout. I ordered them from Forward Motion and according to his online specs, 2.5L Forged Turbo Piston 22cc dish volume. I opted for the 40 over as I had to bore my block due to some sitting coolant for who knows how many years
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post #32 of 80 Old 12-16-2017, 12:40 PM
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Re: 1990 Dodge Dakota Turbo Build

Looks beautiful!
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post #33 of 80 Old 12-16-2017, 08:56 PM
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Re: 1990 Dodge Dakota Turbo Build

How did you end up sorting the turbo plumbing? Can you post some more pictures?
Looks really good.
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post #34 of 80 Old 12-19-2017, 02:06 PM
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Re: 1990 Dodge Dakota Turbo Build

I was wondering if you just machined a pad and bolt holes for the TB around the "freezeplug" in the opposite end of the manifold.
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post #35 of 80 Old 12-20-2017, 01:09 AM Thread Starter
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Re: 1990 Dodge Dakota Turbo Build

Alrighty,

The past few days have been just screwing around, and fixing problems that have come up. So far I have gotten rid of all of my engine codes including the code 23 for a intake temperature sensor. I did this by drilling a hole in the intercooler piping just after the blow off valve. There was a blank on the intake manifold that looked like a good place to put it, but from reading into it, some people seem to have trouble with it heat soaking, so I opted for this option instead. My plan was to weld a nut onto the piping and just have it screw in, but I couldn't for the life of me find a nut that the sensor would screw into, so until I figure that out, I just drilled a hole big enough to have the sensor "sorta"screw into the pipe, and then wrapped it with some quick drying JB Weld. Its good enough to hold, but wont stop me from chipping it away when I want to do it properly. As advised from some other posts, wiring it up to the ECU was a breeze. I didn't have any pins that fit, but I found a wire that fit snugly into the hole and the pin on the computer makes nice contact with it, so not too worried about it.
As far as my fuel problem goes, I hooked up two gauges in different locations on the fuel line and get good pressure at idle, and all the way through a few psi of boost. I tried blocking off the hoses with a clamp, and even a c-clamp, but fuel was still getting by. Must be some serious hoses I have hooked up. For now, since the pressure is good, im running it but my gut says that the valve in the pump is bad causing the immediate lack of pressure after the engine is turned off. I will get to it, but its farther down my list.

As always there is a problem or two left over. Right now It idles fine, and drives fine, except for an instant around 2k rpm at light to half throttle where it goes quite lean. I can feel a noticeable lack in power, and my AFR pegs onto the lean end. Everywhere below, and above this it is fine and I get into the 12's above 2k. Not sure if it is possibly a sensor pulling timing, or whats going on. Ill definitely be keeping my eyes on it. Just a weird thing as it is golden everywhere else besides maybe that 50 rpm in the middle.

Concerning the intercooling piping, it runs straight up, out of the turbo, and then 90 bends towards the front where it enters the intercooler. On the other side, it exits and then shoots across the front of the engine, and then 90's into the intake. It is all done with straight pipe pieces and silicon 90's. The intake had been chopped at its original end, where originally it had the elbow attached. This was welded shut, and then the throttle body was welded onto the opposite end of the intake. I should have taken a picture of it outside of the bay, but this should give a good idea of what it all looks like.
I have a Mishimoto intercooler, and some 2.5" aluminum piping just sitting in the bed waiting for me to get my hands on a tig so I can make it all look really clean as far as the intake side goes, but that shall be for another day.

detobias, INSATANSSEAT and land like this.
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post #36 of 80 Old 12-20-2017, 12:47 PM
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Re: 1990 Dodge Dakota Turbo Build

That's awesome. In that pic it looks like it could have been a factory manifold!
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post #37 of 80 Old 12-21-2017, 09:10 AM
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Re: 1990 Dodge Dakota Turbo Build

Envy! You should throw up a few video on YouTube. Are you worried about detonating the rear-end? Also, what clutch setup did you use?
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post #38 of 80 Old 12-23-2017, 11:42 PM Thread Starter
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Re: 1990 Dodge Dakota Turbo Build

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Envy! You should throw up a few video on YouTube. Are you worried about detonating the rear-end? Also, what clutch setup did you use?
Ill see about throwing a video up when I have all the kinks worked out, and with it properly broken in. I have thought about the rear end, but from what I have researched about what is in there, as long as I don't dump the clutch, and stick to gravel pits over parking lots, it should hold together without any issues.
I really want an lsd in the back, so a new axle and diff will probably be in the late future.
The clutch is just a OE equivalent replacement from exedy. Should hold up without any issues
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post #39 of 80 Old 12-23-2017, 11:44 PM Thread Starter
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Re: 1990 Dodge Dakota Turbo Build

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Originally Posted by INSATANSSEAT View Post
That's awesome. In that pic it looks like it could have been a factory manifold!
Unfortunately I cant take credit for it, but it was done really well!
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post #40 of 80 Old 12-25-2017, 12:53 PM
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Re: 1990 Dodge Dakota Turbo Build

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Unfortunately I cant take credit for it, but it was done really well!

Was it something you bought that was already done or was it welded and blended by a friend of yours? I'm spending nearly $600 on a manifold for my drag cars, maybe I could put out some good money on one that looks awesome for the Mopar Express Dak.
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post #41 of 80 Old 12-26-2017, 01:02 AM
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Re: 1990 Dodge Dakota Turbo Build

lol
that's not a bad mod for the top half of a two piece once you have replaced it with a plenum

make the top into something sellable ...

nice project to watch - there was a black shortbox 4 cyl 5 spd dakota at my local dealer way back that I still wish I'd had the 6K for in the day
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post #42 of 80 Old 12-29-2017, 01:48 PM
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Re: 1990 Dodge Dakota Turbo Build

Wow. Johny! Your a genius. There are like a thousand top halves sitting around peoples garages. Looneytuner has one by me. He installed a Lengel unit.
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post #43 of 80 Old 12-29-2017, 08:19 PM
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Re: 1990 Dodge Dakota Turbo Build

Out of curiosity, just what is in the rear axle of that truck?

What would be your idea of a good upgrade?
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post #44 of 80 Old 12-30-2017, 10:03 AM
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Re: 1990 Dodge Dakota Turbo Build

7.25", same as used in a lot of slant six car going back to the sixties. There are some upgrades available. Of coarse, one could always source a V8 Dakota axle too.

I'll include some links below.

Factory ratios offered include but are not limited to:

2.26:1 - Used in many civilian M-bodies over the years
2.76:1 - Used in 80s Dakotas
2.93:1
3.21:1 - Used in 90s Dakotas
3.23:1 - Used in many Slant 6 cars from 1963-1969, and 80s Dakotas
3.55:1 - Used in 80s Dakotas
3.90:1 - Used in 90s Dakotas
3.91:1 - Used in 67 Formula S Barracudas with power-lock
4.11:1

Aftermarket gear ratios available include but are not limited to:

2.26:1
2.76:1
2.94:1
3.21:1
3.23:1
3.55:1
3.90:1
4.10:1
4.11:1

https://www.dippy.org/forum2/index.php?topic=73.0

https://www.drivetrainshop.com/Chrysler_7_25_s/80.htm

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post #45 of 80 Old 12-30-2017, 10:20 AM
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Re: 1990 Dodge Dakota Turbo Build

Here's what Hollander Lists. This is for a '95 but should be the same.

4X2, Hexagon Cover (Chrysler 7 1 4), 2.76 Ratio
4X2, Hexagon Cover (Chrysler 7 1 4), 3.21 Ratio
4X2, Hexagon Cover (Chrysler 7 1 4), 3.55 Ratio
4X2, Round Cover (Chrysler 8 1 4), 3.21 Ratio
4X2, Round Cover (Chrysler 8 1 4), 3.55 Ratio
4X2, Round Cover (Chrysler 8 1 4), 3.90 Ratio
4X4 (Chrysler 8 1 4), 3.21 Ratio
4X4 (Chrysler 8 1 4), 3.55 Ratio
4X4 (Chrysler 8 1 4), 3.90 Ratio
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