Does this have something to do with how soon the EGTs increase to a certain level/temp? Reason I'm asking is I'm looking to get a BHAF and I've seen folks say things like "it increased my 'spool-up' time".
If it DOES refer to EGTs, what is a good/acceptable EGT temp to be at--ie, How do I know when I have reached adequate "spool-up" ?

 

What is a good temp (EGT) to shoot for before turning off the key? I try to let her get down to 299/300 before I turn off--is that alright or is that overkill? Will "bad stuff" happen if I turn off at 400?

 

spoolup =building boost and i think that is a good egt to turn off at, that is what i read to be the best, the cooler the better

 

Below 300°F is probably optimal. What I've found more than temp is time. If you've been raping the throttle and immediately pulled into a parkings spot, give it a good 3 to 5 minutes of idle time. If your just doing "spirited" driving then maybe 1 to 2 minutes.

Heck of alot easier and cheaper to idle for a minute or two than fry your turbo bearings, so when in doubt be conservative!.

 

Especially if you were working it from pulling a heavy load. It's good then to let it idle for a good 10-15 minutes before shutdown. You'll prevent premature bearing/seal failure and coking of the turbo.

 

Ok--thanks yall! Regarding "spool up", what's a good temp to reach before driving out of the drive way?

 

sorry, missed the definition of "spool up" Ok, spool = boost (in lbs.) What's a good "poundage" (or spool) before driving off?

 

"Spool up" refers to how fast the turbo gets to spinning. More air, like the BHAF allows more air....faster spool up....quicker boost....lower EGT's. I think I got that right....


Your boost will be near 1 or 2 psi on a normal start. You won't build boost until you get moving and pour more fuel to it. I never though about looking at the ETG gage before taking off. You'll find that even with everyday driving, your EGT gage will fluctuate up and down, depending on how fast you accelerate or start pulling a grade on the highway. You right foot and the right gear for the situation will control your EGT's.

Use your EGT gage to monitor the temp. My EGT gage has a "yellow" warning at 1050* and starts the "red" warning at 1225*. Most agree that it does not hurt to run into the red for a few seconds, but longer than that, you risk melting a piston. I've been shutting mine down at about 300* for nearly nine years and a little over 200K with no problem.

I'm sure you'll get a much better answer than mine from some of the high performance guys.

 

boost is from you turbo. Spool up is how long it takes your turbo to reach optimal boost. When you floor-it most modded truck smoke heavily because their turbo is not spooled - as rpm and engine load increases you turbo gains boost or "spools". Under normal driving you do not need to spool before driving off,only if you are racing and you want to remove the "lag" when you floor-it then you hold the petal and brake and get the motor to about 1400RPM remove you foot from brake and floor-it,you truck will acelerate much faster

 

Adding the BHAF will reduce spool-up time because your turbo has less restricion that stock,therefore your turbo spins-up faster equaling faster,and snapper acceleration

 

Thanks again (nice to see a few Texans online tonight..this'll be my last for the night). I installed my Quad Commander (digital gauge) couple weekends ago --like it allot. My EGTs stay around 750-average (some into 800's); rare to 900's. My boost is in the 20lb range after initially going down the driveway...odd though, at startup before I turn over the engine, she reads 8lbs...I think I need to find a way to zero-it out. During normal driving (no loads), the boost bounces between 25-ish to about 39-42ish. My fuel psi reaches 10lbs usually a few mins after driving and floats between 9-11 in general. Transmission temp starts warming enough for a measurement after about 8-9 mins and climbs to about 145-degrees in general; levels to about 155 if I stop for a few mins...I'm wondering what this is going to do when summer really gets here... ''g'dnite yall -d

 

Higher the EGT(exhause gas temperature) the more Boost(PSI of air going into your motor after the turbo pressurizes it) your motor will create

 

Groovy--thanks!! -d

 

good info,and here all this time I thought "spool up" was what I see first thing in the morning

 

I think you have a gauge issue - how the heck are you getting boost pressures that high on the stock 'charger?