:::RHMT::: Real Home Made Turbo
General Category => Engine Management => Topic started by: mrgreengenes on August 05, 2010, 10:46:41 AM
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anyone unfortunate enough to have had to tune an s3oo unit on an eddy brake dyno have the car act completely retarded? Say, down 50% power, and dropping out after 6000rpm?
stock ignition, 7's resistor plugs, typeR rods/pistons, 57trim, tuning non vtec only so far, 11psi at most.
regards
phil
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So the car operates differently on the street? y/n? You've had it back off the dyno to verify the problem only exist on the dyno?
S300 is a huge antenna, I'm not surprised an eddy brake wreaks havok with it. Although, there might be a problem with the eddy brake that is causing extra interference since S300 + eddy brake dynos work fine for other people.
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no road testing yet.
we did an experiment, where we unplugged the dyno an operated it as inertia only. We netted a repeatable 210hp.
Then we tried with the dyno plugged in, with no eddy load, same result.
We put a 1% DC(minimum) load with the eddy, and lost 18-20hp, and the torque curve looked like it had an ignition fallout after 6500rpm.
FYI: we were tuning the car up to then with a 30% load. It was falling off HUGE after 6000rpm, bucking like a chick after you tell her she's fat whilst nailing her from behind...
The eddy brake is approx. 3 feet from the ecu
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Which dyno?
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dynocom
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Ah, you're the guy with the Pod units.
I get the feeling there really is no load in inertial mode, which means there is an outside chance it's a common ignition misfire. THe engine doesn't misfire until under a certain amount of load, and you aren't reaching it. 1% duty isn't indicative of a whole lot, inductive reactance could have the load a 1% be relatively significant... although you would ASSume the loading control to be a smooth and uniformly incremental affair so that 1% doesn't induce any significant load.
Look, you suspect the dyno. Only way to test is put the wheels back on and roll the car down the road. I'm pretty curious, too.
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How's the ground connection on the dyno? If the grounds bad a leaky coil will transmit instead of tripping out through the ground lead.
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If JD is right, give it a shot in inertia mode while holding the brakes down a bit. Just don't fry them.
Otherwise wrap the ecu in tin foil, preferably copper anti-EMI tape, then wire that to the chassis and to the building's ground (plumbing/etc).
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If JD is right, give it a shot in inertia mode while holding the brakes down a bit. Just don't fry them.
Otherwise wrap the ecu in tin foil, preferably copper anti-EMI tape, then wire that to the chassis and to the building's ground (plumbing/etc).
great idea with the foil. set oven to 400f and bake for 20 minutes. The car itself is fucking up, tried on the street, and datalogged a couple of runs. 1st one logged properly, with semi fucked readings after 5000rpm and the TPS dropping signal before i let off. The other times, logging just froze up.
super sweet. Need to check grounds.
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So it takes you guys two weeks to tune cars?
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Yeah, and every one we do we lose money on. How do we stay in business, you may ask? VOLUME! hahaha but srsly no, we've been juggling a bunch of other shit work and put this on the back burner. All done now, took out the s3OO unit and tuned it on crome, made 404hp at 15-16psi.
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Removing S300 is always my first option.
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Yeah, and every one we do we lose money on. How do we stay in business, you may ask? VOLUME! hahaha but srsly no, we've been juggling a bunch of other shit work and put this on the back burner. All done now, took out the s3OO unit and tuned it on crome, made 404hp at 15-16psi.
Sound like another argument against Honda. :?: ;D :yes: