billbadass
Drag Racing Champion
- Location
- your moms house
I have to say it depends on what you're doing with the car also, for standing mile or 1/2 mile stuff the difference between how the car behaves on the dyno vs. at the track is huge. I've had tunes in my early days that worked great on dyno and did not work at all and knocked horribly in 15-20 second full low WOT situations. Also these long pulls will really show weakness in fuel systems and other components, like the methanol fuel distribution issues that you see in normal intake manifolds really can be seen in long long pulls as the leanest cylinder continues to gain heat faster than the others, or some motors the coolant doesn't flow as evenly so some cylinders get hotter from that etc. this is not apparent in a 4 second dyno pull or whatever. I bet for road race guys it's probably even more important.
i've always preferred road tuning to dyno for these reasons, but Hoon makes a good point on ethanol and you can also map out the torque vs rpm more precisely if pushing the limits of stock engine stuff
i've always found the best tuners if tuning something really stout will always pull whichever plus is running leanest and manually inspect it, which you can do easier on the dyno too since you can shut it off right there exactly after the pull. so that is one benefit of dyno sometimes too especially if the car is hard to pull the plugs
my guess for 99% of <450whp street cars though it doesn't matter as long as the tuner is good.
i've always preferred road tuning to dyno for these reasons, but Hoon makes a good point on ethanol and you can also map out the torque vs rpm more precisely if pushing the limits of stock engine stuff
i've always found the best tuners if tuning something really stout will always pull whichever plus is running leanest and manually inspect it, which you can do easier on the dyno too since you can shut it off right there exactly after the pull. so that is one benefit of dyno sometimes too especially if the car is hard to pull the plugs
my guess for 99% of <450whp street cars though it doesn't matter as long as the tuner is good.