chassis dyno do's, don'ts

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Jul 6, 2007 | 05:57 PM

katana ace

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Intermediate

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From: Post Falls Idaho

chassis dyno do's, don'ts

gonna let the instructors and students in our summer high performance class chassis dyno my '00 coupe next week. do I instruct them to set in competitive mode or not? anything else I need to be thinking of beforehand?

Jul 6, 2007 | 06:04 PM

Singer Island C5

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From: Singer Island Florida

Great question.

I'm sending my blown vert for dyno testing next week and outside of clean air filter, fresh oil and blower juice I don't know if there's really anything else to do. Do any of the CF tuners have any input on this?

Jul 6, 2007 | 06:18 PM

jzemo

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From: Southside Alabama

i have an appointment on the 12th for my dyno...not sure when yours is but i'll let you know which mode we have mine in

Jul 6, 2007 | 07:12 PM

BOTYNV1

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From: Title town, Champs live here.

St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19

Does it make a difference? I don't understand how it would.

Jul 6, 2007 | 07:14 PM

TM-Z06

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From: Hayward CA

On the dyno - turn traction control completely off.

Jul 6, 2007 | 07:17 PM

Mick_C5

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From: Northern NJ

Jul 6, 2007 | 07:38 PM

reactor2

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From: Minnesota

Turn off the traction control. Dyno numbers should be taken from 3rd gear (automatic) and 5th gear (manual).

Jul 6, 2007 | 08:46 PM

XKR100

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From: SANTA MARIA,CA. formerly Magnolia Texas

St. Jude Donor '08-'09

Quote:

Originally Posted by reactor2

Turn off the traction control. Dyno numbers should be taken from 3rd gear (automatic) and 5th gear (manual).

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Jul 6, 2007 | 08:54 PM

Silverbullet00

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From: Norman Oklahoma - The Only State in the Union with no Blue Counties!

My 2000 MN6 goes on the dyno in the morning! First time! I'll be watching this thread all night! Thanks in advance for the pointers!

Jul 6, 2007 | 09:22 PM

#10

FactoryRaceCar

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St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12

Quote:

Originally Posted by Silverbullet00

My 2000 MN6 goes on the dyno in the morning! First time! I'll be watching this thread all night! Thanks in advance for the pointers!

I was going to PM you to remind about the pics of the dyno day and the dyno chart

Jul 6, 2007 | 10:06 PM

#11

Silverbullet00

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From: Norman Oklahoma - The Only State in the Union with no Blue Counties!

Don't worry Nouman, aka FRC, I will post pics and the chart for you to laugh at!

Jul 7, 2007 | 02:18 AM

#12

LV Vette

Melting Slicks

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From: Las Vegas Nevada

St. Jude Donor '08

Quote:

Originally Posted by reactor2

Turn off the traction control. Dyno numbers should be taken from 3rd gear (automatic) and 5th gear (manual).

I’ve never heard using 5th gear on a manual for a dyno run. I have only heard 4th. Is this something new or am I missing something?

Thanks,

Clayton from Las Vegas

Jul 7, 2007 | 02:29 AM

#13

Bill Dearborn

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From: Charlotte, NC (formerly Endicott, NY)

Quote:

Originally Posted by LV Vette

I’ve never heard using 5th gear on a manual for a dyno run. I have only heard 4th. Is this something new or am I missing something?

Thanks,

Clayton from Las Vegas

Every dyno run I have had was in 4th.

Bill

Jul 7, 2007 | 04:21 AM

#14

Blown 346

Melting Slicks

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From: Rockford Illinois

Make sure thay have a fan in front of the car so it doesnt overheat. Also make sure they dont hit the brakes on the dyno, that could end up very bad.

Jul 7, 2007 | 04:27 AM

#15

reactor2

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From: Minnesota

Quote:

Originally Posted by LV Vette

I’ve never heard using 5th gear on a manual for a dyno run. I have only heard 4th. Is this something new or am I missing something?

Thanks,

Clayton from Las Vegas

OK, I've never been to the dyno but isn't 5th the closest gear to a 1:1 ratio with the engine?

Jul 7, 2007 | 04:28 AM

#16

gpracer1

Le Mans Master

Joined: Feb 2006

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From: Phoenix AZ

4th is 1:1
5th and 6th are both overdrive
Gear Ratios
LS1/MM6 LS6/M12
1st Gear 2.66:1 2.97:1
2nd Gear 1.78:1 2.07:1
3rd Gear 1.30:1 1.43:1
4th Gear 1.00:1 1.00:1
5th Gear 0.74:1 0.84:1
6th Gear 0.50:1 0.56:1
Reverse 2.90:1 3.28:1

Last edited by gpracer1; Jul 7, 2007 at 04:31 AM.

Jul 7, 2007 | 04:35 AM

#17

Mr. Azrael

Pro

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From: Manteca, CA

Quote:

Originally Posted by reactor2

Turn off the traction control. Dyno numbers should be taken from 3rd gear (automatic) and 5th gear (manual).

If you dyno your MN6/MN12 car in 5th you are going to get some low numbers...

Should be dynoed in 4th gear 1:1, 5th and 6th are OD gears.

Jul 10, 2007 | 10:43 AM

#18

C5XTASY

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From: Monticello MN

Any other factors such as weight, amount of fuel, tire pressures, etc? I wouldn't expect any of that to matter on a dyno, but have heard of various methods to get higher numbers on a dyno, other than screwing with the software.
Ed