It does seem fast, but then you think about how quickly air is rushing through the intercooler and the temp drops that you see there. Heat transfer on the volume of air we are talking about occurs pretty rapidly.

It is interesting to see the actual numbers to get a real picture of how things are working.

 

Several factors influence the temp readings; the airhorn probe is sheathed (& grounded, I assume) type K - what is the in-head IAT? Also, the intake charge is shedding heat to the airhorn, while absorbing thermal energy from the head. Without the same type of probe and same method of sampling, I wouldn't regard delta temps of less than 10*F as significant.

You should contact Chris Brahs (cbrahs) out in Albuquerque - there's a small but dedicated group of diesel bombers out there that has a lot of fun together... bunch of good guys.

Even the OEM CACs are pretty efficient; ~ 2psi pressure loss across it and removes enough heat from the compressed air to produce single-digit differentials... i.e. the '05 with stock parts runs about 5-10*F higher in the airhorn than ambient during normal part-throttle driving, and won't climb higher than ~ 25*F differential at max fueling (usually run out of road and/or gear before it completely stabilizes).

Biggest difference for the '04.5 is the switch from the HE341 to HE351... larger compressor & duty-cycle modulated wastegate solenoid.

Think of the intake charge's short duration through the CAC and how much thermal energy is transferred... with inlet temps of 350-500*F and outlet temps in the 100-150*F range.

For a hyperbolic example, consider the exhaust of a hair dryer.

 

BTW -
I'm putting the word out for a pair of HE351s for our '98 parallel twin turbo project - looking to get some take-offs for fitment/fab, would prefer good condition units ready to rock!

Willing to trade for parts...

 

Good points but.....What's a hair dryer?

RJ

 

Oops!

Didn't mean to aim below the belt...

 

Not a problem. Figured I better say it before someone else picked up on your example and made a less passive remark.

RJ

 

Well, we know Robert wouldn't dare to say anything...maybe Charlie too? (can't remember the last time I seen 'im without his hat )

Fess up, guys - any more of the Follically Challenged hereabouts?

Baldies Unite!

 

I still have a head full.

Too bad everything under it is slipping away.

 

BALDIE by choice here , well buzzed anyways.

the 05 i drove this morning i was not real impressed with it. road noise was unbearable. had a few more blemishes that what the photo showed. o also leaving there lot, the water temp got to 240ish, from there on it was down hill.

so i drove an 06 mega, 2wd with 32k miles and i think i fell in love.... if it had a stick in her i probably would have drove it home.

 

UH OH!!! Max has the new truck fever. i guess we won't ever see ol red anymore.

 

no need for a stick... You wanna go fast right????

 

thought about it, might aswell get this one paid off i dont owe to much on her.

EDIT: IMPULSE buys and/or purchases out of a fit of rage are going to catch up to me one day.

so now i need to find someone that knows a thing or two about the CR to help diagnose my issues and just fix it, if i am lucky it is just a sensor somewhere....

Scott, yea fast is fun, but so is "GRABBIN' GEARS" and i dont want to pay 5-7K for a built auto tranny.

 

What issues?

Don't you know that you're surrounded by Beautiful Minds around here!

 

i am not sure if i am driving my truck incorrectly, but at the next meet all ya'll can tag team her to see if the same results pop up..

about half the time i start in second gear, let out the clutch with no addtion of the the skinny pedal, and about half the time it works and goes fine and smoothly...


the other half the time, the RPM's drop to about 400-500, the JUMP up to 1100 or so giving this wonderful bucking affect.

OR, from a rolling idle in 1st 2nd 3rd gear, i push the skinny pedal and there is no response or a "dead pedal" for about 1/2 second then it JUMPS up again creating a nice bucking affect

lately the idle has been rougher, i am leaning toward injector issue??

all the symptoms have been around long before the introduction of jet a.

affect/effect i never know which one to use, always troubled me in highschool.

 

Tps sensor?