Dyno with full exhaust - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Dzmitry · 01-19-2022, 07:32 AM

Quote:

Originally Posted by OkieSnuffBox

Which is weird, typically you want to dyno/tune the car in the 1:1 gear. Which in the case of the twins would be 5th, IIRC.

Right, he is aware of that. But like I said, his reason was the airflow being poor as 5th gear will pull for much longer and create much more heat with very little airflow. I don't know a lot about the science of it, but I have certainly seen dyno's make a big fuss about having a proper large fan with realistic flow based on the dyno speed. So I assume there is some good reasoning there.

Strat_FRS · 01-19-2022, 02:32 PM

We dyno in 4th. 5th would cause cooling issues on most dynos as the runs would be long.

The issue is not the 1:1 ratio as when you enter the engine RPM it automatically corrects for gear ratio.

The issue is loading the motor. You do load the engine more in the higher gears if it's a loaded dyno and that results in high combustion chamber heat and often more power unless you overwhelm the cooling system. However 4th for this car is sufficient and if you are doing comparisons keep using the same gear.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Dyno Results - OFT Stage 2 UEL + Openflash Header + Full Exhaust	pinski	Software Tuning	8	11-21-2016 11:07 AM
2013 FR-S Full Blown Motorsports Stage1 Turbo kit. Mustang Dyno results.	Infamous Performance	Forced Induction	10	07-03-2013 08:52 PM
T1R Full Exhaust re-dyno x DRIFT OFFICE TUNE !!!!	AJ PwR	Engine, Exhaust, Transmission	19	04-25-2013 05:10 PM
FINAL RESULTS: Taking Full Blown Stage 1 To The MAX! @Pure Automotive (Dyno Inside!)	Pure Automotive	Forced Induction	57	03-27-2013 11:41 PM
Initial Review + First Dyno Run for my Full Blown Turbo FRS on Friday, Feb 1 @ 3pm	TyperRspec789	Mid-Atlantic	66	02-02-2013 02:25 PM

01-19-2022, 02:32 PM	#16
Strat_FRS Member Join Date: Oct 2021 Drives: 2015 FRS for daily and track use Location: Vancouver, Canada Posts: 82 Thanks: 14 Thanked 204 Times in 51 Posts Mentioned: 9 Post(s)	We dyno in 4th. 5th would cause cooling issues on most dynos as the runs would be long. The issue is not the 1:1 ratio as when you enter the engine RPM it automatically corrects for gear ratio. The issue is loading the motor. You do load the engine more in the higher gears if it's a loaded dyno and that results in high combustion chamber heat and often more power unless you overwhelm the cooling system. However 4th for this car is sufficient and if you are doing comparisons keep using the same gear.

User Name		Remember Me?
Password