Clutch slipping?

[dusthomps]

JFitzgerald,



You never know, I've put some serious thought into going. I might just be there, still not sure though.



Dustin

 

[JFitzgerald]

Yeah, come on down. Heck, Piers came last year from B. C. Canada!

 

[CAROLINA CUMMINS]

oops, I'm sorry did I say 33# I meant 35! I didn't have A chance to really let her loose until last night it was good and cool so I just nailed it to the wall in 5th and she pegged my boost guage out at about 80mph.









:--)



Steve

 

[dusthomps]

Fitz,



I'll try to give you a little follow up to your question. The bigger injectors on the non-intercooled models has to have something to do with higher boost numbers. I wonder if another thing that makes a difference is the turbo only has to push the air less than 2 feet to get to the manifold, vs. pushing it through the intercooler and piping. I thought for sure someone else would have responded to your question with some better technical knowledge. Perhaps the title of the thread is keeping the automatic boys away. #ad
Never know, maybe someone will eventually chime in.





Dustin

 

[JLEONARD]

"By the book" typical pressure looses thru an intercooler are about 2 to 4 psi.

That same book also states that the increase in air density due to the reduced air temperature with an intercooler more than makes up for that difference.

Jay

 

[JFitzgerald]

Interesting points, Dustin and Jay. The boost vs. HP numbers don't seem to track like I'm used to seeing, so apparently there's more to the puzzle than I had thought. For comparison, my truck was making 23 psi boost last year at the time it was dynoed at 196 HP/572 TQ. If you figure 20% drivetrain HP loss, the calculated flywheel HP usually seems to relate to about 10 x the boost number, and this seems to work out roughly with a lot of the boost and HP numbers I've seen.



(196 x 1. 2 = 235. 2, roughly 10 x my boost)



So I'd like to see what HP numbers you guys would have at 35 psi. I know this stuff is all relative and there are many variables.

 

[BushWakr - RIP]

Hey ya,,, you guys kinda wandered off track from the thread question here... hopefully the thread starter is ok with that... . maybe a new thread to cover this topic ????



284 RWHP @ 40psi = reached 284 by 53mph and held till 70mph but topped pyro at 1700*F@70mph too... :--) :--)



Bob.

 

[CAROLINA CUMMINS]

Yeah, I'm fine with it. I learned what I needed to. I kinda like the way this has gone







Steve At 35# and rising

 

[dusthomps]

Fitz,



I understand what you are getting at with the different variables. Now I can bury the boost gauge so I'll just use 35# as my example. Using your figures my truck would be at roughly 280 rwhp. Aside from the BHAF and turned up pump, everything else is stock. I'd find it hard to believe that I'd be around even 250 rwhp being basically stock.



Using Bob's truck as an example because his truck is known to be at 284, he has made many adjustments and upgrades to hit that 284.



On a side note, were there any changes to the engine to meet the emission standards that went into effect 1/1/91 that could affect power output? I saw something about it in the latest TDR issue, but my friend borrowed it so I cannot look at it. #ad






Dustin

 

[JFitzgerald]

I read about that formula for figuring boost vs. HP here at some point. Doesn't seem to work out consistently though. Not sure about the emissions changes.