Well, I take the rig on a short 30 jaunt towing at 18k...and I sense I might not have the baby's butt lined up correctly. SOP says that the van turbo, by itself, lowers EGT's.....well not for me. I produce less boost and I'm running hotter than the stock SD turbo with a WW2 installed. I need to take the same trip tomorrow, but when I get home, I'm crawling under the hood and have a look at the baby's butt locator pin.

I hope it's wrong...if it's connected correctly...HUGE disappointment.

 

Uh oh......strange to say this but "I hope you misaligned it as well".......at least that would give you a quick diagnosis.

 

Baby's butt appears lined up.

 

Crap.

So currently you have higher EGTs, more smoke and slower spool combined with less boost?

Could it be anything with your up pipe install, I believe you changed out the up pipes and then did the turbo all at once, right?

 

Check your downpipe too.. I pulled up pipes apart 5 times before I discovered the downpipe wasn't seated right

 

Maybe a boost leak at one of the boots?

 

I did a quick once over of the boots...looked good. I plan on checking all that today and the up pipe to manifold connection. I have boost leak fitting, I'll try that later as well.

 

What are your boost numbers at wot? With a van turbo and stock wheel with leaking uppipes I hit 26 psi at wot... I'm not sure how that will compare to your setup.

 

I did a WOT empty and brought the boost to 34. Maybe this is how the truck will act with the 1.15...maybe the EGT will climb to 1300 and stop? That's a fine number from my research. But I'm concerned that if I ever leave the flat land what WILL happen.

What's is your boost at say 65mph (2200rpm) rolling down the road, no headwind, tailwind, up/down hill. Previously I'd be 3 psi or so maybe 570 EGT. Now boost is ZERO and EGT in that 570 range. It really doesn't make any boost until 2k rpm.

 

That wheel may be the down fall to this setup... I hate to say that. Before I had leaks I would hit 32 psi at wot in 80e now I'm down to 26... I gotta fix that sometime soon. My boost as you describe is still right around 3 psi. I do have a lot of lag. From 0-8 psi it takes forever to get going but from 8 psi-26 psi happens in the blink of an eye

EDIT: I'll have to double check ny rpms at 2200 on the express way... At 65 I'm only around 1700ish rpm. I'll shut the od off and see what it reads. I'm working a 12 today and hope I dont forget

 

2psi cruisin highway at 65mph and about 500-550egt. I have stock sticks and it looks like you are pushing more fuel for sure with your 160/30's. My max boost is 26psi but I suspect I have leaky exhaust manifolds. Not looking fwd to pulling them.

I agree it could be the wheel in this configuration. If all else checks out maybe swap the stock back in? i know PITA!

 

John...what wheel? The D66 wheel or the 1.15 housing?

As it is right now, I have a SD turbo with a .84 and a WW2...and I have this van turbo 1.15 and a D66 WW2. I could swap the machined compressor housing on the SD .84 ex, or I could go back to the "stock" compressor housing with the WW2. The fly that would get in the ointment is if a 1.0 ex housing was the solution.

 

The D66 you have on the van turbo your running now. It sounds like a great setup if you're racing and want all that top end. I'm no turbo expert by any means. I've heard great things about the WW2 and van turbo.
I didn't notice anything worth talking about when it came to the van turbo cooling egts I'm also running stock sticks and I can spike my gauge but if I back off for just a second and get right back on it 9 times out of 10 my egts drop to around 1100 and stay there. I think some of this has to do from all the turbo lag that comes with the van turbo and once it's spooled and I let off it gives it that split second it needs to bring those numbers back down. This is all from a dead stop to about 100 mph or so wot.
Try letting off for a split second and get right back on it and see if you have the same thing I do.

 

The D66 wheel should replicate the 38R wheel when installed in a machined 38 housing. And plenty of people run the 38R with success. It may be that the 1.15 ex is just too much. Perhaps a 1.0 would turn the D66 wheel more efficiently?

 

I am thinking it is at that AR (1.15) you are going to have some lag. I am not sure about why the increase in EGT's though. I would think something is leaking.