I broke out the good old Desktop Dyno 2000 the other day to play with the head flow numbers my dad got for the Trans-Am.....but anyways, yeah, I loaded up the stock 3.1 dyno and was wondering if anyone knew what numbers I would have to put in the induction part for the turbo to see how close it reads compared to factory numbers.....
Anyways, here is what I would need if known....
Flow CFM:
Pressure Ratio:
Boost Limit:
Surge Flow CFM:
Efficiency:
If not its okay, just something to play with when I'm bored....
150cfm..this is with the restrictive intake
2pr
15psi limit
300???
78%?
Try this
220cfm
2.22
15psi
600
97%
Have you pluged it inn?.
I keep getting good numbers on a different type of coulculator. 270hp. Must be the DR and VE.
Try 65%ve and 1.5 DR...that intake has got to go..LOL..surge limit 240cfm . That sound realistic..??
Plugged it in
1st set *150 CFM* showed 266@5500 HP and 296@4000 TQ with no intercooler
2nd set *220 CFM* showed 250@5500 HP and 280@3500 TQ with no intercooler
Last set you said is closer showed 189@5000HP and 236@3500 TQ with no intercooler.....
What do you think the intercooler efficiency is, I may just plug it in, and just start playing around, from intial testing, I just can't get the TQ number low enough I can get it to peak, and drop off, it is always going up slightly first, then droping off, always around 3500 where its peaking....
the formula for PR is boost psi +atmospheric pressure divided by atmos. pressure.....ie. 14.7 psi.......
so yer stock boost of 7.5+14.7/ 14.7=1.51
intercooler efficiency is over 90% at just 15 mph
as for the TQ ratingbeing so high.........that is correct...remember that these cars are "TQ managed" ie. computer hindered!!! most likely to save the tranny
so the factory number of 225 is with the computer SLOWLY rampin the boost up to full boost at around 3500 rpm(this is also why it is goin up slightly on the chart)..which is where u say TQ peak is......makes sense to me
...........the guys with manuals can add in a manual boost controller which allows the turbo to reach full boost at any rpm .......imagine the fun u could have with all that low end TQ!!!
now i use desktop dyno 2000 also and i love this program but one of the things it doesnt take into account is the computer managed torque......take for instance.....the stock figures of peak tq of 236@3500......this is with no boost ramp......if our cars were allowed to hit full boost at almost idle the TQ figures would go through the roof (and the rpm peak of boost would drop signifigantly)....hence diesels make so much freakin TQ cause they hit full boost at low rpm.....this is the best formula for tq.....and the opposite is true for high HP numbers......high boost at high rpms
also which field are u puttin in the cfm for .....the TB is what .....help me out guys 236? i think....and the stock turbo is what 300? make sure u have the right cfm in the right field..........
Quote from: m6amba
also which field are u puttin in the cfm for .....the TB is what .....help me out guys 236? i think....and the stock turbo is what 300? make sure u have the right cfm in the right field..........
the stock 3.1 one I have is the one I downloaded from 60*V6 site when they had them there, so I'm assuming its correct, here, I uploaded some images of what I'm seeing using the last set of numbers..you make a good point on the computer controlled thing....
http://home.earthlink.net/~z284pwr/grand_prix/stock31.jpg
http://home.earthlink.net/~z284pwr/grand_prix/turbo31.jpg