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Old 03-26-2006, 08:31 AM   #1
El Gato
Scooby Specialist
Member#: 110648
Join Date: Mar 2006
Chapter/Region: PRSIC
Location: San Juan, Puerto Rico
2005 Hydramist 35R82
93oct 479whp 456tq

Default Hydra Dbw Problem

I just got the Hydra updated with the 2.17 firmware and a larger TPS Span because the TPS couls not be calibrated. I generated a map with the help from a friend with a similar setup, calibrated the TPS and selected the stock O2 sensor in Sensors Settings. I have yet to intsall the Hydra O2 Wideband. Closed loop is enabled and the limits are 1200 to 3300.

The thing is I cannot get the car to idle at the idle speed target, which is 900 at 90C. It stays always at around 1500-1600. As I was trying to compensate, the DBW TB went nuts and started reving and "bouncing" upwards. Had to shut down the car. There are no vacum leaks and the car will idle correctly with the UTEC which I tried after noting this problem with the Hydra. I found a post in HYDRA website related to this, cannnot post the URL.

Max Vacum at ISC is at 651. Changing this did not help. ISC VALVE "MIN PWM DUTY", did not help.
What was the solution for his problem? I'll try changing the Integral values to see if that helps, but scared of the DBW being toasted by the HYDRA?

Otherwise, the car drives around just fine. I noted though that at the Throttle settings, MAP Sensitivity Threshold is at 35 but the stated range is 1-20. Is this related? Is this bad?

Appreciate any assistance.

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Old 03-26-2006, 10:52 AM   #2
Scooby Specialist
Member#: 27108
Join Date: Oct 2002
Chapter/Region: MWSOC
Location: Detroit-ish, MI
2004 STi
2004 A4


Whoa... a *lot* more information here than in your Hydra forum post!

On the STi the PWM2 map corresponds to the ISC Valve Min PWM Duty. The Min PWM Duty setting on the Settings-ISC screen is useless (used on WRX and other applications).

Why couldn't you calibrate your TPS?
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Old 03-27-2006, 11:10 AM   #3
Element Tuning
Former Vendor
Member#: 54918
Join Date: Feb 2004
Chapter/Region: MAIC
Location: Gaithersburg, MD
673 WHP Element
Tuning Pro Comp Engine


I'm not sure if you have an Element Tuning Hydra but if you do and sent it in for a software update you need to notify me as I have to restore the orginal mapping updated for the newer software. Since there are new features the old mapping may not have the correct settings from Hydra EMS.

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