- Joined
- Dec 15, 2008
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- 33
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- 185
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- South Berwick, Maine
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I have a new to me 1985 JDM73 with a 3B rotary pump. PO wanted more power, so he bought a turbo kit from someone on MUD (NOT Diesel42) and installed it. He figured he would be extra smart and he researched where the pump timing was set on a 13BT, and he then altered the timing on the 3B pump "by a little bit" to match the 13BT timing spec. He did this without driving the vehicle after the turbo install. Everything was done in one session. He said he used a probe tool that somehow measures the internals of the pump (or something like that). He had experience timing VW diesels and said it was similar, and seems confident he did what he was trying to do.
So he has no idea if the timing adjustments made any difference either positively or negatively.
He never adjusted the fueling. Just drove it. I got it, and it feels underpowered from where it should be. So I added some fuel and it's a little better. Now I get a some black smoke if I floor it but it's nice and clean at idle.
I never get above 600 on the pyro after adjusting my fueling. And it struggles to reach 10 psi of boost.
So, my questions are this:
Should I endeavor to put the 3B pump back to stock timing settings or leave it alone set where he said matched the 13BT timing specifications? If so, how do I do it? I did some searching but don't see stuff about the rotary pump, only the inline pump. Has anyone attempted to do what he did and can give me help to "undo" it if the timing change is still causing the lack of power?
It's drivable the way it is, but I know that a properly Turbo'd 3B can be a better. And I want to give Diesel 42 a big shout out. I thought the kit on the truck was his, and even after we realized it was not one of his he has spent time on the phone with me looking at it. Great guy.
I understand that my turbo may not be a perfectly engineered setup...and it may be doing exactly what it's supposed to be doing which is just not as optimal as Diesel42's kit. So I'm looking to learn if the pump timing adjustment could be an issue. If its' not an issue, I may decide to buy a Diesel42 kit and sell this one in hopes of improved performance.
So he has no idea if the timing adjustments made any difference either positively or negatively.
He never adjusted the fueling. Just drove it. I got it, and it feels underpowered from where it should be. So I added some fuel and it's a little better. Now I get a some black smoke if I floor it but it's nice and clean at idle.
I never get above 600 on the pyro after adjusting my fueling. And it struggles to reach 10 psi of boost.
So, my questions are this:
Should I endeavor to put the 3B pump back to stock timing settings or leave it alone set where he said matched the 13BT timing specifications? If so, how do I do it? I did some searching but don't see stuff about the rotary pump, only the inline pump. Has anyone attempted to do what he did and can give me help to "undo" it if the timing change is still causing the lack of power?
It's drivable the way it is, but I know that a properly Turbo'd 3B can be a better. And I want to give Diesel 42 a big shout out. I thought the kit on the truck was his, and even after we realized it was not one of his he has spent time on the phone with me looking at it. Great guy.
I understand that my turbo may not be a perfectly engineered setup...and it may be doing exactly what it's supposed to be doing which is just not as optimal as Diesel42's kit. So I'm looking to learn if the pump timing adjustment could be an issue. If its' not an issue, I may decide to buy a Diesel42 kit and sell this one in hopes of improved performance.
