Anyone else have Boost spikes with EBC hooked up? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 11-28-2007, 03:19 PM   #1
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Default Anyone else have Boost spikes with EBC hooked up?

EBC is hooked up and working fine however my boost is weird. 1st thru 3rd i spike up to maybe 12-13 then hold 8-9psi. 4th and 5th gear i spike 14-15 and hold 12-13psi. I get full boost by 4500RPM and im pretty sure my muffler is whats restricting me (obx muffler) but does anyone else have this issue also? I dont know if im asking for too much or not but i want to boost about 11-12psi 1st thru 3rd and 13-14 psi 4th and 5th.
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Old 11-28-2007, 07:20 PM   #2
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so im the only one with spikesss? haha
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Old 11-28-2007, 07:28 PM   #3
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Its spiking because you are overshooting when it ramps up. You just need to work on your ebc map to correct the overshoot out. PNP doesnt mean PND (plug and drive)
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Old 11-28-2007, 07:28 PM   #4
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Part of the beauty of EBC is you should be able to tune out any spikes like that. What does your EBC duty map look like? Screenshot is fine.
You want it to build boost as fast as possible then smoothly hold the max boost you tune it for.
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Old 11-28-2007, 07:31 PM   #5
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I spent 30 minutes on the highway with a buddy last night trying to fix this and that was the best i could do. ill get a screen shot in about an hr when i get home for you guys to take a look at.
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Old 11-28-2007, 09:02 PM   #6
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Old 11-28-2007, 09:25 PM   #7
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How about a datalog from a long pull-- from well before boost onset on up. I need to see manifold pressure versus BCduty in the logs.

It definitely shouldn't be 'spikey' at all. Relatively smooth actually. Though it looks like you're using my scaling on your DC table, which may not match how your turbo spools very well. I'll be able to see this in your logs...
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