How did I dyno this high? (not that I am complaining)

Red__Zed · 08-21-2011, 11:24 PM

6MT · 08-21-2011, 11:24 PM

Quote:

Originally Posted by Red__Zed

98intrigue · 08-21-2011, 11:32 PM

Quote:

Originally Posted by 6MT

Well, do you think that if I were to travel down a very long hill and reach a very high top speed; that I would deduce that my car has more "power" than someone who runs a short run on a measuring device? Like a dyno? Trap speeds are measurements like dyno runs. But trap speeds can be very deceptive.... as the example above proves.

MattP725 · 08-22-2011, 12:09 AM

Well the numbers weren't the point. My baseline was 333 and the tune brought me to 343 so that's a solid gain on the uprev. Whether I am truly at 343 or 315 or 295 really is irrelevant like everyone says since there is no universal dyno standard with identical atmospheric conditions.

At the end of the day my goal was the tune which went better than expected. I def wanna get some track nums tho.

Jordo! · 08-22-2011, 06:15 AM

Going by the baseline numbers, those values probably better reflect what you are making at the crank rather than what you are putting down...

What kind of dynamometer?

On a dynojet, that would probably be around 300 with those mods and a tune.

370Z's make mid to high 270's bone stock on a dynojet with SAE correction; higher if the Nismo.

V8Killer · 08-22-2011, 06:33 AM

Quote:

Originally Posted by Jordo!

Going by the baseline numbers, those values probably better reflect what you are making at the crank rather than what you are putting down...

What kind of dynamometer?

On a dynojet, that would probably be around 300 with those mods and a tune.

370Z's make mid to high 270's bone stock on a dynojet with SAE correction; higher if the Nismo.

I wouldn't say that all 370z's make that bone stock. When I did mine in NC on the coast about 20ft above sea level SAE corrected 285 is what I was doing on a Dyno Jet. The shop is very reputable and their dyno is on par with a domestic shop that is very reputable in my area as well. I wouldn't say 300 at the crank b/c 370z's are rated 332 at the crank off the assembly line. Do I think those numbers are a little high yes, we all agree on that even the OP. I agree with take it to the track and see what she does. Just my 2cents though.

ANMVQ · 08-22-2011, 06:55 AM

Quote:

Originally Posted by 6MT

Inaccurate dyno. But that's my opinion. And opinions are like a$$holes. Everyone has one. My personal belief is that the dyno you got those numbers from has some real "issues" with "real-world" factors. Wheel weights, temperatures, altitude, and I could go on.

Let me say that IMHO, your numbers are very inflated. And There are endless arguments about these number "issues". In fact the only arguments that garner more responses (and emotions) are the oil threads.

So take your results for what they are. And try and grow some thick skin. You'll need it.

(That's why I never post my numbers or charts on this or any other forum. They cause too many arguments.)

Agreed with the above, Number are VERY infalted. Sounds like the had a HUGE correction factor.. When dynoing try to have them set the factor to or as close to 1 as possible to try to get "Real" World numbers .

MattP725 · 08-22-2011, 07:11 AM

By base I meant prior to tune. I still had my mods.

MattP725 · 08-22-2011, 07:14 AM

Nope the correction and uncorrected both showed. Corrected was around 5-8 HP higher so that doesn't explain it.

V8Killer · 08-22-2011, 07:30 AM

Just take it to the track man that is the best way to do it.

esfourteen · 08-22-2011, 08:44 AM

Quote:

Originally Posted by 6MT

Well, do you think that if I were to travel down a very long hill and reach a very high top speed; that I would deduce that my car has more "power" than someone who runs a short run on a measuring device? Like a dyno? Trap speeds are measurements like dyno runs. But trap speeds can be very deceptive.... as the example above proves.

do you know of any 1/4 tracks that run down a hill? calculating hp by using the trap speed of a 1/4 mile run and your vehicles weight is very effective.

ChrisSlicks · 08-22-2011, 08:54 AM

PM has a reputation for having inflated dyno numbers, Mustang dyno's typically read lower than Dynojet - but in their case it is higher

But anyway like you said it is the relative difference that matters and that the car feels better after the tune. Real world driving is the real test.

wstar · 08-22-2011, 09:46 AM

Really we get what we deserve as a community (car modders in general).

Most people just want to see high numbers on the dyno. It's what ultimately pays and makes a lot of people come back. They get work done at the same shop they dyno at, and they want to see a big number that compares well to other internet dyno numbers. So the numbers are constantly inflating at lots of shops due to tuning and tweaking of the dyno's parameters and little games of how you set up the run. In many ways this is like the conundrum of women's dress sizes. None of them make sense, and there's no direct comparison between any two brands, or even the same brand in different years and seasons.

Really, it wouldn't be that hard for most dynos to read the same. The parameters (mostly, weight-related and weather-related) can be accurately measured and compensated for. In a world where we can define time and weight to more accurate decimal places than anyone knows what to do with, accurately compensated and comparable dyno numbers across the US is a totally realistic goal, if only the market really wanted that.

Cmike2780 · 08-22-2011, 09:48 AM

No roller dyno is 100% accurate. The only number anyone should be concerned with are the gains. What's to say most dyno's read low. It doesn't matter. It's not like the OP was comparing this to other dyno's and bragging about it. Dyno's are only tools to track your progress and figure out if your mods actually show gains.

Yeah PM's tend to read on the high side, but I really don't understand why people get so pissy about seeing a high number. A 10hp gain is pretty accurate for an UpRev tune.

Red__Zed · 08-22-2011, 09:53 AM

Quote:

Originally Posted by 6MT

Why are you agreeing?

08-22-2011, 06:15 AM	#20 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 417	Going by the baseline numbers, those values probably better reflect what you are making at the crank rather than what you are putting down... What kind of dynamometer? On a dynojet, that would probably be around 300 with those mods and a tune. 370Z's make mid to high 270's bone stock on a dynojet with SAE correction; higher if the Nismo. __________________ Enjoy it. Destroy it.

08-22-2011, 07:30 AM	#25 (permalink)
V8Killer A True Z Fanatic Join Date: Feb 2011 Location: Newport, NC Posts: 1,127 Drives: It Hard Till It Pops Rep Power: 16	Just take it to the track man that is the best way to do it. __________________ "Punch" Too much to list and a baby shot of nitrous....

08-22-2011, 08:54 AM	#27 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 653	PM has a reputation for having inflated dyno numbers, Mustang dyno's typically read lower than Dynojet - but in their case it is higher But anyway like you said it is the relative difference that matters and that the car feels better after the tune. Real world driving is the real test. __________________ Hotchkis ARB \| Stillen CAI \| Art Pipes \| Berk CBE \| Stillen AP Racing Brakes \| AE Performance Oil Cooler \| BC Racing ER Coilovers \| Doran Control Arms

08-22-2011, 09:46 AM	#28 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	Really we get what we deserve as a community (car modders in general). Most people just want to see high numbers on the dyno. It's what ultimately pays and makes a lot of people come back. They get work done at the same shop they dyno at, and they want to see a big number that compares well to other internet dyno numbers. So the numbers are constantly inflating at lots of shops due to tuning and tweaking of the dyno's parameters and little games of how you set up the run. In many ways this is like the conundrum of women's dress sizes. None of them make sense, and there's no direct comparison between any two brands, or even the same brand in different years and seasons. Really, it wouldn't be that hard for most dynos to read the same. The parameters (mostly, weight-related and weather-related) can be accurately measured and compensated for. In a world where we can define time and weight to more accurate decimal places than anyone knows what to do with, accurately compensated and comparable dyno numbers across the US is a totally realistic goal, if only the market really wanted that. __________________ 7AT Track Car! Journal thread / Car setup details

08-22-2011, 09:48 AM	#29 (permalink)
Cmike2780 A True Z Fanatic Join Date: Jun 2010 Location: Long Island Posts: 5,059 Drives: slowwww Rep Power: 28	No roller dyno is 100% accurate. The only number anyone should be concerned with are the gains. What's to say most dyno's read low. It doesn't matter. It's not like the OP was comparing this to other dyno's and bragging about it. Dyno's are only tools to track your progress and figure out if your mods actually show gains. Yeah PM's tend to read on the high side, but I really don't understand why people get so pissy about seeing a high number. A 10hp gain is pretty accurate for an UpRev tune. __________________ [09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R] [ArchitTEK Photography]

08-21-2011, 11:24 PM	#16 (permalink)
Red__Zed A True Z Fanatic Join Date: Jul 2010 Location: window seat Posts: 28,940 Drives: Mostly on two wheels Rep Power: 119

08-22-2011, 12:09 AM	#19 (permalink)
MattP725 A True Z Fanatic Join Date: May 2011 Location: Toms River, NJ Posts: 1,904 Drives: 2010 40th Rep Power: 16	Well the numbers weren't the point. My baseline was 333 and the tune brought me to 343 so that's a solid gain on the uprev. Whether I am truly at 343 or 315 or 295 really is irrelevant like everyone says since there is no universal dyno standard with identical atmospheric conditions. At the end of the day my goal was the tune which went better than expected. I def wanna get some track nums tho.

08-22-2011, 07:11 AM	#23 (permalink)
MattP725 A True Z Fanatic Join Date: May 2011 Location: Toms River, NJ Posts: 1,904 Drives: 2010 40th Rep Power: 16	By base I meant prior to tune. I still had my mods.

08-22-2011, 07:14 AM	#24 (permalink)
MattP725 A True Z Fanatic Join Date: May 2011 Location: Toms River, NJ Posts: 1,904 Drives: 2010 40th Rep Power: 16	Nope the correction and uncorrected both showed. Corrected was around 5-8 HP higher so that doesn't explain it.

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