TurboedGSR

just came back from speedworks...a little dissapointed. I'm still on a 12:1 fmu so i didnt expect big numbers but this seems too low: 220.8hp, 178.6tq @ 9psi (SAE corrected) this is on a stock gsr block besides a .079hg (9:1 cr)
how exactly does a dynamometer calculate tq figures? when i asked the guy about ratios he just said he used 4th gear...my 4th isn't 1:1 ...and what about fd?
i'd post the sheet but dont know how. I have the viewer from dynojet.com and can see it on my computer but dont know how to convert it to a jpeg file.
thanks

edit: dont worry about the title...


[Modified by TurboedGSR, 10:08 PM 3/8/2003]

intekragsr

interested as well...bump

UberTeg

Load up the viewer, display the dyno chart, press the "Print Screen" button (which is to the right of F12 on my keyboard). Then load up Microsoft Paint (start->programs-accerories->paint). Next, press control+V, or goto edit->paste. Then save it and email it to me and i will post. vertigo118@***.net


[Modified by UberTeg, 10:46 PM 3/8/2003]

TurboedGSR

I only downloaded the viewer not the whole program (2.xMB on 56k=too long) so i cant do that but here a picture of the actual sheet



not too clear but look @ the a/f curve...why does it lean out then come back up? i would think the fmu would starve in the higher rpm

edit: grammar/spelling


[Modified by TurboedGSR, 11:23 PM 3/8/2003]

SilverS

12:1 FMU @ 9PSI of boost? thats a disaster waiting to happen.....

40psi at idle
12psi of fuel pressure per LB of boost
9psi of boost

thats almost 150 psi of fuel pressure at the rail!!!!
injectors cant handle that

TurboedGSR

i realize that, which is why i'm confused...why 11:1 @ 8k

TurboedGSR

did this guy dyno correctly. are those # right?

also forgot to mention, the lean curve was present on all 3 runs; 5, 7, and 9psi. and i do have an inline pump. why is this happening. why 12.9@6k rpm but less than 12 before (after the turbo has spooled) and closer to redline?

DIRep972

iTrader: (1)

ive always used speedworks dyno and its always worked good for me. u can dyno in 3rd or 4th gear it doesn't really matter because the dyno calculates out the gear ratio's anyways. it looks to be that u r way lean make 100% sure that the inline is hooked up and working properly. the reason the car gets richer as it goes higher in the rpm's is cause once u past the point of peak torque u don't need as much fuel thats pretty common on fmu's.

I really think its the inline because look how at 4k rpm where u start getting boost ur a/f should go really rich. well it starts too, but then it just flattens out. Its like it starts to add fuel but then there is probably a problem with the pump and ur relying on just the intank and that can't keep up so it goes lean. my .02


[Modified by DIRep, 10:39 AM 3/9/2003]

TurboedGSR

i thought about that but couldn't figure out how it can calculate the ratios?
the computer doesnt know what final gear ratio to reduce the power to.

for example, lets say my car made 175tq@6000rpm:
175*1.360(3rd gear)*4.40(fd)= 1047.2tq or 1196.34hp at the axles (reduced later by wheel diameter)
the computer has to have a number to reduce this figure to what the actual engine makes with no gear reductions. they assumed that, after wheel diameter, the ratio would be a perfect 1:1 in 4th gear...a 360 degree crank rotation for a full turn of the wheel. I dont know how acurate that is.

I talked to viren earlier (btw, best customer service. thanks viren) and he told me 5th was a 1:1 ratio and that he'd dynoed before at speedworks and then intercrew and got higher #'s

the fmu and inline will be gone in a few weeks. the pump sounds to be working at idle (little annoying humm) but you're probably right, its an old msd

Arturbo

He got higher #'s at intercrew because he had a different set up that was going to make more power. 4th is a 1:1 http://ff-squad.com/Bgears.htm if you are looking at the tranny. It also depends on what size tire you are using that will effect that but not that much.

art

TurboedGSR

4th is the closest gear to 1:1 but it still has to go through the fd. so are you saying the [stock] wheel's diameter cancels out to a perfect 4.40.

i've heard people say 17's (wheels) rob around 5hp...is this because of the extra weight or the bigger overall diameter. if you were right direp, wouldnt the dyno automatically compensate for the difference in gearing and give the same hp reading whether you had 13's or 19's

DIRep972

iTrader: (1)

the dyno only knows ur rpm and mph. it doesn't know what gear u r in. it takes the mph and the rpm and has a formula to convert it to a 1:1 ratio. I dyno'd my car in 3rd and 4th gear and the only difference in power was about .2hp. the only reason people say u make more power in 4th then 3rd is the added load on the motor. when 17's robb hp its because its power lost through the drivetrain, basically the added wieght.

TurboedGSR

sometimes i think too much...i'll just wait for the seminar. im sure i'll learn how it works

DIRep972

iTrader: (1)

i do that too ur #'s look pretty good though considering how lean it is. I think the problem is probably somethin to do w/ the pumps but if ur planning on hondata it would be a smart buy. I think after some tuning u would be really happy w/ the #'s.

DIRep972

iTrader: (1)

think of it like this. here go to this site http://www.jadesupra.net/gears/index.html

now on this site u can put in ur tire size, final drive, and ind. gear ratio's w/ rpm and it calcutes ur mph @ each rpm in each gear. it probably uses the same formula the dyno uses except the dyno does it backwards. the dyno doesnt know ur gear ratios but it knows ur rpm and mph so it can calculate it.

keebler65

if you want to still make it a jpeg, you can get it to where you can see it, then hit "print screen" on your keyboard (right by scroll lock). then paste into paint and save.