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4 minute(s) of a 99 minute read
4-20-2009
Dum dum dum....
Where is da turbo?
4-21-2009
and Guys / Gals ... HPC that does STS coatings for their cold side pipes... will coat your hot side turbos for somewhere between $120-150 * PRICE IS COATING ONLY & DEPENDS ON TYPE OF COATING YOU WANT, no shipping yadda yadda.
So I'm going to get mine ceramic coated from them and see whether I like it or not, which according to several people up here getting it ceramic coated will greatly benefit the spool time and holding heat in.
This way it also avoids the "cold water in blanket all of a sudden gets hot" syndrome
What I'm trying to say is that the ceramic coating isn't expensive at all, even including shipping there and back. and actually HPC is here in NC (where I am) and I drive back and forth about every 2 months or so right by them and didn't know it. I drive from Charlotte, NC to Wilson, NC and they are right in Whitsett, NC off I85/I-40 Exit 138.
4-25-2009
STS has no idea about "my" compressor map. The only thing that I have been able to find out after calling several places/resources and asking the hell out of them was that:
T04E 60-1 60mm .81A/R Garrett turbo.
630HP @ 15PSI @ 63LB/MIN
HOWEVER, this goes along with the 10LB/Min per 10HP.....
as 630HP divided by 10 = 63 .....
According to Garrets Turbo Tech 101,102,103:
~69HP = 10LB/Min Airflow
*Yes i know there are a lot of variables, but I have set everything up to "my" conditions.
SO... I think I'm going to run out of airflow before I hit 500HP from this turbo.... I'm going to step it up to an 8.7psi spring, which should land me somewhere in the LOW 7psi range actual (At manifold) and we will just see what she makes.
Garrett says use your TARGET FLYWHEEL(CRANK) HP... Using all the equations from Garrett:
WELL, here is my data:
I made :
423 RWHP @ 5500 RPM & this was at 5psi to the teee
431 RWTQ @ 4000 RPM
423 REAR WHEEL HP
15% Losses = 486 CRANK HP
Atmospheric pressure assumed to be 14.56
BSFC = 0.63 (divide by 60 to get per minute)
AFR=12 (thats what i'm running)
And with that I get:
61.3LB/MIN airflow
**IF my BSFC goes to 0.6 ; I get 58 LB/MIN
HOWEVER, with Garretts MAP required to make the HP:
Engine Volumetric Effic= 0.94 (percentage)
Intake temp = 105
Gas Constant = 639.6
Previous Airflow 61.3 LB/MIN
RPM MAX = 6200
Engine Displacement = 345.678
I get 20.94 PSIA, subtract 14.56 from earlier , I get =
6.38PSIG ......
I do understand that this is all in the "numbers" and in theory versus the real world...but when my 60mm turbo runs out of lb/min airflow , its simply going to not flow any more air.
anyone want to chime in some change?? LOL.
The airflow I would be flowing to make 505HP is in the HIGH 60LB/Min mark w/ a pressure ratio of 1.96 and boost required of 9.9PSIG
according to that and garrets compressor maps I need a large frame turbo and so far I see this one (i haven't looked at them ALL yet): and even on this one, I'm so far towards the CHOKE LINE that I don't think its for me
GT4094R - 751470-19
http://www.turbobygarrett.com/turbob...94R_Comp_e.jpg
someone help.... i'm losing my brain in these numbers, and this theory VERSUS real world.
