Dyno load + boost creep question
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Dyno load + boost creep question
I'd like to make a couple of runs on the dyno with my FC in the coming weeks and have one pretty important question...
Like many forum members, I do have some boost creep to deal with on my car, even with a ported wastegate (which obviously wasn't ported enough). In third gear on the road the car makes a solid 12 psi which is perfect for the fuel/ECU I'm using (720 secondaries, Rtek 1.7 ECU).
My question is, will a dynojet put more/less load on the car during a pull or is it very consistent with the load of road-driving. I'm just concerned that increased load from a dyno may cause additional boost creep and I defintely don't want to overboost the motor during a pull.
My boost gauge does have a warning feature so I assume I can set it to maybe 13 psi and tell the operator to back off during a pull if the warning comes on.
Like many forum members, I do have some boost creep to deal with on my car, even with a ported wastegate (which obviously wasn't ported enough). In third gear on the road the car makes a solid 12 psi which is perfect for the fuel/ECU I'm using (720 secondaries, Rtek 1.7 ECU).
My question is, will a dynojet put more/less load on the car during a pull or is it very consistent with the load of road-driving. I'm just concerned that increased load from a dyno may cause additional boost creep and I defintely don't want to overboost the motor during a pull.
My boost gauge does have a warning feature so I assume I can set it to maybe 13 psi and tell the operator to back off during a pull if the warning comes on.
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Eat, sleep, work, mod.
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From: Long Island
Mainly, I'm curious as to other forum members experience w/ boost creep on the dyno. Is it the same as, better than or worse than it is on the street. I always thought those big heavy rollers would present more load.
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From: Long Island
bumpity
I'd asssume to see around 230-250 rwhp with 12-13psi on my mods - seem like the right ballpark? Mods are in my sig.
I'd asssume to see around 230-250 rwhp with 12-13psi on my mods - seem like the right ballpark? Mods are in my sig.
Last edited by jon88se; Jan 14, 2005 at 03:47 PM.
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From: n
DynoJet typically loads the car less.
Just run the car in 3rd - it should be fine.
Some will argue you NEED to do it in 4th gear, since that is 1:1 ratio and claim this has the least friction through the drivetrain.
They are right and wrong - it doesn't matter.
Just remember to keep your runs consistent in the same gear, and then you can do direct comparisons of the graphs.
If you do change gear, note that - the numbers will be different.
I like to do runs in 3rd gear, cause the car is under load for a less amount of time.
Trying to get the car to cool down in between runs is a pain in the *** sometimes.
4th gear pulls just take too long and heats the car up unnecessarily.
-Ted
Just run the car in 3rd - it should be fine.
Some will argue you NEED to do it in 4th gear, since that is 1:1 ratio and claim this has the least friction through the drivetrain.
They are right and wrong - it doesn't matter.
Just remember to keep your runs consistent in the same gear, and then you can do direct comparisons of the graphs.
If you do change gear, note that - the numbers will be different.
I like to do runs in 3rd gear, cause the car is under load for a less amount of time.
Trying to get the car to cool down in between runs is a pain in the *** sometimes.
4th gear pulls just take too long and heats the car up unnecessarily.
-Ted
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