Had My Car Dynoed Today

[Sammie]

alrite tommorow morning il head back there and show them wat my mate did and ask them if that was the reason for the boost loss at high revs cause afte rmy mate connected sum tubing there my car has never felt more powerfull

[dezz]

Man i would love to know how you guys are getting 182rw/kw from a stock GTST... sorry to say but sounds to me the dyno tuner is playing with the roller settings just to make you think you got 182rw/kw... or maybe ur reading the dyno wrong... could be in HP not KW... read the dyno thread and there are guys with full exhaust, FMIC, boost struggling to hit the 180+rw/kw... either way post a dyno graph...

As for your car sammie, maybe the bov was the issue in boost leak? if you can feel better power now, that may have been your problem...

Cheers,

Sarkis

dear son of rajab...

please READ the posts you are commenting on before commenting on them

I clearly stated several times that I KNOW my car IS NOT making anywhere near 182rwkw, as it was 100% stock and it IS NOT POSSIBLE for a 187flywheelkw car to have 182 at the wheels.

I have the dyno graph and will gladly upload it for you when i can scan it...i'm quite capable of telling the difference between the lettering "kw" and "hp"

justin911 made approx 200rwkw in 4th gear, and 243rwkw in 3rd gear.

where is there NOT a difference?

also not the difference. approx 40rwkw extra in 3rd gear over 4th for his car

so ~180rwkw - ~40rwkw = ~140rwkw....

[BezerkR32]

Curious as to why the boost issue wasnt sorted out on the dyno by the tuners, I wouldnt be to dissapointed as you obviously have some issues to sort out. Should be looking to push a bit more boost through it aswell.

If you can get it to see and hold 13psi, i think you will be a lot happier.

Dyno graph:

[Sammie]

yea i know felt like adiffernt car after what my mate did however need to get the ebc readjusted so it holds at 11 consistant and have no leaks

[dr00]

fwiw my rb25 has similar mods but with safc and 12psi and made 179rwkw (240hp) on the hyperdrive dyno.

[dezz]

scanner is borked so i just took a photo of it...

Stock R33 GTS-T. so tell me the gear doesn't matter....

[Sydneykid]

scanner is borked so i just took a photo of it...

Stock R33 GTS-T. so tell me the gear doesn't matter....

The gear doesn't matter, as long as the correct data is input. But that aplies to any gear/any car/any time when it is put on the rollers.

cheers

PS; lots of imports are dyno'd in 3rd gear as the 180 kph speed limiter (in the standard ECU) causes an issue in 4th gear.

Edited April 28, 2006 by Sydneykid

[dezz]

The gear doesn't matter, as long as the correct data is input. But that aplies to any gear/any car/any time when it is put on the rollers.

cheers

PS; lots of imports are dyno'd in 3rd gear as the 180 kph speed limiter (in the standard ECU) causes an issue in 4th gear.

so would you say that the wrong data was put in Gary?

because it is simply not possible that this car has 182rwkw. even now with the cat back, that figure is still not possible.

and why did another guy get 200rwkw in 4th and 243rwkw in 3rd...is it just a case of wrong data?

[DivHunter]

Wierd so many people saying it doesn't matter, I think SK hit the nail on the head. It doesn't matter IF the right information is input. In otherwords, the operator had NFI but instead of sorry made a mistake lets do that again... nah you just have a freaky 'never know what's under the heatshield' R33 putting out almost 1:1 power.

[dezz]

Wierd so many people saying it doesn't matter, I think SK hit the nail on the head. It doesn't matter IF the right information is input. In otherwords, the operator had NFI but instead of sorry made a mistake lets do that again... nah you just have a freaky 'never know what's under the heatshield' R33 putting out almost 1:1 power.

that sounds more like whats happened...

he did id once and i think it said 185, then he said, oh woops, the air temp didnt put itself in...so he corrected it then it got 182...

im getting it done at another place next week i hope....i was going to get 1 done in 3rd and 1 in 4th...

a mate of mine took his ford there (grechie, u might know him jacob..) and he got different readings for 3rd and 4th as well....:

[paulr33]

it is possible that it made 182rwkw on that dyno on that day.

its just that the gear ratio's alter the output figure.

the flywheel figures are measured at the engine so there are no gear ratio's taken into consideration. it just turns out that the run you got was in 3rd and everyone else's was done in 3rd. the run is still valid but is not very useful when comparing to everyone else that has been done in 4th.

if you keep doing your runs in 3rd then its fine as its an accurate comparison. but useless if comparing against my car in 4th gear as the gear ratio works in your favour. the run is valid but not really useful IMHO.

the power is so high in 3rd as the gear ratio is much higher than it is compared to 4th.

so the wheels turn quicker with the engine at the same speed.

ie: engine at 4500rpm in 3rd with say a ratio of 1.432 and engine at 4500rpm in 4th with a ration of 1:1 in 3rd it will be turning quicker

ie: 1.432 vs 1:1 in 3rd the wheels turn 1.432 times quicker than in the 4th equivlanet, which gives you the more power reading, as in fact the wheels are tuning higher, outputting a higher figure.

[dezz]

omg

some say the gear doesnt matter, then others say it does

no one can seem to clearly explain my dyno sheet. the car is stock bar k&N panel filter...

if the gear isnt supposed to change the figure, then why has it done so on 3 cars on 3 seperate dynos with 3 seperate operators....1 of them being very reputable on this forum...

[dezz]

the power is so high in 3rd as the gear ratio is much higher than it is compared to 4th.

so the wheels turn quicker with the engine at the same speed.

ie: engine at 4500rpm in 3rd with say a ratio of 1.432 and engine at 4500rpm in 4th with a ration of 1:1 in 3rd it will be turning quicker

ie: 1.432 vs 1:1 in 3rd the wheels turn 1.432 times quicker than in the 4th equivlanet, which gives you the more power reading, as in fact the wheels are tuning higher, outputting a higher figure.

your saying the gear DOES affect the power, and the others are saying it doesnt.

all i know is that my car IS NOT 182rwkw, and no one can tell me for certain why thats whats on the sheet

[DivHunter]

Do a power run in 1st? lol

[paulr33]

by saying your car is not 182rwkw is misleading.

it did in fact make 182rwkw on that dyno, on the day.

However

you are saying that based on the cars power output in 4th (that its not possible a stock gtst can make 182rwkw).

this is because you wish to compare it to everyone else.

everyone quotes their power in rwkw done in 4th gear.

so for everyone else the car would have made around 140rwkw in 4th.

as the dyno was done in a different gear its not on comparable field.

your car is 182rwkw but in 3rd gear

if i go and dyno my car in 3rd tomorrow

and make a figure then i can say my car made 250rwkw

but its pointless as it was in 3rd so its not useful to use in comparison.

my advice, scrap the sheet and get a run done in 4th

and finally

gear ratio makes a difference for comparison reasons against other people in other gears

gear ratio doesnt make a difference if you compare with other people in the same gear, or wish to do a back to back compare of your previous run

[justin911]

paul.. thats what dezz is saying... but half the ppl are saying 3rd and 4th gear will give you the same result... which is whats causing the confusion

[dezz]

well it must be a case of the wrong data being put in, IF infact it should give the same KW reading having all the correct data.

either way, it was done in 3rd id say, and considering the fact I paid for it so that i had a base to compare (against future mods, and everyone elses power) i've been ripped off. I can't use my 3rd gear sheet to compare to anyone but myself.

[paulr33]

spot on dezz. although it is still a power run chart of your cars power it useless for comparing against anyone else on the forums that has a 4th gear run

[Bobjones]

The gear does matter as the higher the gear the faster the acceleration hence the more the power. I do believe that there are some happy dyno's around and I think thats what dezz saw, as the a car that crept up off the rear rollers due to the higher torque gear; hence the high reading.

Yes ever so slightly, but peak power will be the same...

Splitting hairs it seems has become part of this forums best qualities...

I actually have dyno runs back to back in third and fourth with 0.2rwkw change...with a 2 dregree inlent temp change...

I am amazed at how much spray there is that gears matter sooo much...its bullshit.

Edited April 28, 2006 by Bobjones

[rob82]

The way dyno dynamics works is by applying a constant load on the rollers, the amount of load is user defined in no shootout mode however in shootout mode the load or ramp rate is pre set meaning that it cannot be changed. The data that needs to be entered in such as gear and tyre pressure will make no difference to power however the barometric pressures, room temps and intake temps will. The other number which is very important is the tacho number as this is the number that is needed to determine torque. The way the tacho number is found is by running the car up to set speed and taking the rpm at this point. This is why you can run a car in any gear and you should still get the same hp reading because in lower gears the accleration rate is faster but the tacho number is higher while the taller gear have a slower acceleration rate but a lower tacho number.

The reson that your car ran 240kw's in third is probably due to the fact that the car crept up off the rear rollers meaning it doesn't have to spin them which increases the acceleration of the car hence increase in power. I usually use taller gears or straps as it stops this happenings.