Mr Burns would be proud! (mmmmmSMITHERS!!) Awesome deal, and yet another outstanding writeup, You dude !

 

Thanks for the kind words folks.

Yesterday evening was spent cleaning up the yard there where all this took place.

I put about 30 or so miles on it in mixed speeds.

Today I managed to fix the one leak I found in the aux fluid filter mount. I'd used Leak-Lock on all the NPT threaded connections. I botched something on that one apparently. Teflon tape fixed that. The fluid seen doing this was nice and bright candy-apple red.

After driving it around more tonight, I can offer these observations ~

- There's definitely a better "Connection" between the engine and the ground as the throttle/engine presents with more responsiveness (Does that make sense?). There's a new-found notice of slight engine-braking when letting off the throttle. I'm having to re-learn some aspects of driving normally with the new throttle response.
- Not sure how to word it . . . . . . The waste-gate controller is set to 38psig. Historically, that's where it hung under full throttle. I'm all of the sudden able to push the boost up to 40psig, maybe 41, or 42 even. There's a marked increase in turbo-bark with letting off a full throttle quickly. I can hear a new low tone in the in-cab sound of the exhaust system (remember, it's a quiet system).
- While technically, I didn't change anything about the valve-body this time, the transmission seems to be shifting a bit early under a full throttle. I realize that with the OEM converter being so loose, I was "blowing through" a good deal, so it may be I just need to re-learn it all. I dunno. It seems the engine wound-up a little tighter before and perhaps was better realizing the HP peak.


On that last note, I now wish I had a tachometer so I could see where it's shifting and combined with a new dyno run, I can fine tune the shift points.




It's funny how literal the term "Seat-Of-The-Pants" really is when judging subtle changes as such. My SOTP gauge is all the more skewed with the new transmission mounts. I can tell a BIG difference in the "tightness" of the drivetrain's connection to the truck.


I'm gonna take it to the track Thursday night and see how it acts there.

 

Awesome write up man. I have been checking back to see how the test drive went, just hadnt posted yet. I think you had me excited to see how it went I think its good there are still some people who fix stuff themselves. Not saying im gonna be the one building my transmission, but I would like to try my luck at it one day. Id say Goerend will build mine But basically everything that gets done, is by me. Had the tranny out 3 times now Let us know how it runs at the track! Those stock converters really eat some power.

Eric

 

Yessssssssssss

 

The increased boost is definitely due to the tranny...probably specifically the converter. I'd guess that while revs under load are lower, it'll still put more HP to the rollers...and definitely a bunch more torque Time for more fuel

 

Well, as best I can figure, this transmission overhaul is good for roughly .25 seconds.

My all time best 1/8th mile prior to tonight was 9.85 @ 66.53 at approx 75*F

Check this out (@ 86*F)



Not too shabby for an old Cummins in mild trim.

Next week I hope to put it on the rollers and see what's up there.

 

Right on!!! Great to see.

I have been watching your trans rebuild. Great Job!!!!!

Glenn

 

So, what did you beat by 4 seconds?

 

NICE! And not too shabby a 60 footer there (for a 6K lb ride).

 

The boost thing is interesting. I just rebuilt the trans in my truck (98 24v) about the same time you did yours. I got it all buttoned up last weekend.

Before I could hit 30psi pushing hard, and I could barely touch 32psi if I was pretty much WOT pulling my trailer. I didn't want any higher since I have a stock turbo and all.

Put the trans in and I have hit 35psi a few times empty truck, just going down the freeway.

 

I can't remember Dave. I want to say it was a high-school fella in the best he can afford gasser.

I made a total of 13 passes (most I've ever done in a night there). With temperatures in the mid to low 90's when I got there, down to low 80's when I left, my averages for the 13 passes are ~

ET = 9.7299
60' = 2.0293
MPH = 67.33

I thoroughly upset a fella in a late-model Denalli (sp?), supposedly had some sort of an after-CAT turbo and intercooler (?) running 6 or so pounds boost. He had apparently been talking smack to his buddies about how he can whoop'em (one of which is an '06 I think, Dodge/CTD). His buddies were most pleased to see him shut down by an ol'stinky diesel by two seconds.

I was told that the lone Duramax did NOT want to play.


I however, am not in a place to talk smack. I've a few more things I'd like to work on just yet.

 

BC847- all that dough going to your tranny (in materials and supposedly labor, if you consider what your time is worth) and you DON'T have a TACH? C'mon!!! Just givin' it too ya! Great job! I'm tellin' your boss that HVAC service call hours were spent on your truck instead of makin' him money!! Ha!

 

Well, here's before the transmission overhaul 243.4HP/522.9ftlbs on #2 (red graph) ~





And after 244.2HP / 611.1ftlbs on #2 (blue graph) ~




DOH! I just noticed the first is SAE, and the second is STD. Anybody know how to convert one so as to more accurately compare the two?

 

The SAE is corrected for temperature, humidity, and barometric pressure. You need to know the correction factor they used to figure out the raw number. Unless it was a "Good Air" day, the SAE number is likely somewhat inflated.

Raw numbers seem to be more consistent on turbodiesels. Bad air does not seem to affect them nearly as bad as a gasser, and good air does not seem to help as much.

 

David,

How's the tranny temp's before and after the rebuild ? What kind of tranny fluid did you use ?

Good numbers by the way.