Is it ok to dyno in FWD mode?
Oct 10, 2007, 04:48 AM
#31
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this is pretty common with the VW r32 crowd. they use a FWD dyno to tune. they just disconnect the driveshaft. not sure how you would do this on an Evo.
and yes its true, the HP numbers are inflated when you do this. i've seen 100whp off at the 6-700whp level.
just use a street dyno, it will get you really close.
and yes its true, the HP numbers are inflated when you do this. i've seen 100whp off at the 6-700whp level.
just use a street dyno, it will get you really close.
Oct 10, 2007, 02:46 PM
#32
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No. I don't remember the specifics, but it has something to do with welding the diff and swapping transfer cases with a different setup of gears inside of it. It is definitely not done electronically. There's no way of telling the computer to spin the front wheels and not the back wheels.
...that's if I understood the way you were trying to explain it through the use of electronics.
...that's if I understood the way you were trying to explain it through the use of electronics.
Oct 15, 2007, 04:00 PM
#36
Define accurate.
Someone already explained what dyno's are for. If you are looking for HP/TQ numbers, DLL is within 5% of "correct" dyno numbers. If you have a laptop, this is a much LESS expensive AND troublesome way to find out hp/tq numbers. IMO dyno numbers don't mean a whole lot...
Oct 15, 2007, 04:32 PM
#37
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The way that BR and lot of other DSM shop along time ago before Evos, used to pull the tranfer case and install a Viscous Coupling Eliminator. All they had to do is pull the transfer case and install this sleeve. You also must understand that the DSMs only have 5 bolts holding on their TC and dont have an axle or center diff in them. Then you go the Dyno. There was also a car BR built at time when Tim Switzer worked there that dynoed at a touch over 800 whp just in rwd only that was still AWD(dont know how they did that). The car was owned by Scot Wegman. It had a custom water/air intercooler that was the intake manifold!! Sick car to say the least.
Oct 15, 2007, 08:18 PM
#39
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The way that BR and lot of other DSM shop along time ago before Evos, used to pull the tranfer case and install a Viscous Coupling Eliminator. All they had to do is pull the transfer case and install this sleeve. You also must understand that the DSMs only have 5 bolts holding on their TC and dont have an axle or center diff in them. Then you go the Dyno. There was also a car BR built at time when Tim Switzer worked there that dynoed at a touch over 800 whp just in rwd only that was still AWD(dont know how they did that). The car was owned by Scot Wegman. It had a custom water/air intercooler that was the intake manifold!! Sick car to say the least.
Oct 15, 2007, 08:45 PM
#41
good info.
i'll re-recommend the road dyno. from either excel, evoscan, or dll. theres even a new one in the ECUFlash forum that gives an instant estimate based on airflow. The numbers come so close to a real dyno its almost not worth going to a dyno except for tuning. dyno numbers fluctuate as is.
i'll re-recommend the road dyno. from either excel, evoscan, or dll. theres even a new one in the ECUFlash forum that gives an instant estimate based on airflow. The numbers come so close to a real dyno its almost not worth going to a dyno except for tuning. dyno numbers fluctuate as is.
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