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[mrgreengenes]

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

[Joseph Davis]

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.

[mrgreengenes]

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

[Joseph Davis]

Which dyno?

[mrgreengenes]

dynocom

[Joseph Davis]

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.

[SgtB]

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.

[HiProfile]

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).

[mrgreengenes]

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.

[Joseph Davis]

So it takes you guys two weeks to tune cars?

[mrgreengenes]

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.

[Joseph Davis]

Removing S300 is always my first option.

[92CXyD]

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: