turbo civic putting in work

[David88vert]

it doesnt ALWAYS change, but i have seen it change before. A lot of that comes down to just trying to find an extra 5whp and its almost impossible to get the exact number again and again back to back on a dyno. Like mosely said theres too many other factors. So at 30psi your engine oil was 5 degrees warmer than at 50psi, or your IATs were 5 degrees off, etc. Too many factors.

Youre also not MOVING a dyno drum, your spinning it, so it has some sort of built in mass inertia calculation(moment of inertia something like that) that it uses to calculate hp instead of the normal way.

I have not seen an issue of tire pressure affecting a dyno output, but I do know that Dynapaks readings are direct - and remove the tire from the equation. Matt (the HITman) recommended Dynopaks to me, as he believes that the tire can affect readings. His opinion definitely trumps mine.

[Vteckidd]

I have not seen an issue of tire pressure affecting a dyno output, but I do know that Dynapaks readings are direct - and remove the tire from the equation. Matt (the HITman) recommended Dynopaks to me, as he believes that the tire can affect readings. His opinion definitely trumps mine.

Yeah then there are the dynopacs which require no wheels haha Well i believe the TIRE pressure issue with dynojets was effecting the contact patch. Some people said that running rediculous amounts of negative camber can change hp output as well.

[David88vert]

Yeah then there are the dynopacs which require no wheels haha Well i believe the TIRE pressure issue with dynojets was effecting the contact patch. Some people said that running rediculous amounts of negative camber can change hp output as well.

Not if the car is strapped down properly. If you have enough traction not to slip, then the only other factor would be tire sizing. If you are on a negative camber, the edge of your tire would give you a very slight change in tire sizing - that;s the only other factor that I can think of, other than the obvious traction factor.