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10-15-2006, 10:55 PM | #1 |
Scooby Newbie
Member#: 19124
Join Date: May 2002
Location: Northern Colorado
Vehicle:2009 Nissan GTR RED Premium |
Hydra internal map sensor shot?>
I went to get my car tuned over the weekend, and my tuner noticed that my hydra isn't seeing boost correctly.. I checked the vaccuum line running to the unit and it is fine.. at 8psi guage pressure the hydra fluctuates between 3.5 and 4.7 psi? what gives? it is fine under vaccuum, but no where near accurate under boost.. is the internal map sensor shot? does anyone know where to get a replacement, other than the obvious calling Andrew at Hydra.. any help or suggestions would be great. Thanks
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10-16-2006, 03:13 AM | #2 |
Scooby Guru
Member#: 39936
Join Date: Jul 2003
Vehicle:99RS TWE&SCAT EJ257 Hydra+HMist+PPG+35R=DEATH |
open the box IF IT DOESNT AFFECT WARRANTY
and notice how its made the hose might be loose alex |
10-16-2006, 08:41 AM | #3 |
Former Vendor
Member#: 54918
Join Date: Feb 2004
Chapter/Region:
MAIC
Location: Gaithersburg, MD
Vehicle:673 WHP Element Tuning Pro Comp Engine |
The Hydra reads in absolute pressure which tends to read about 2 psi less than most aftermarket boost gauges but some do also read in absolute. Given you are in Colorado I suspect elevation is a significant factor that your boost gauge isn't accounting for where the Hydra is. Given you show about a 3 psi difference sounds like it's functioning correctly.
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10-16-2006, 07:12 PM | #4 |
Scooby Newbie
Member#: 19124
Join Date: May 2002
Location: Northern Colorado
Vehicle:2009 Nissan GTR RED Premium |
but shouldn't the bosst be steady? according to the hydra it fluctuates alot.. and the according to the guage it is rock steady.. also when I crimp the line running to the hydra shouldn't it stall or rev the engine?? when I clamp the hose the vaccuum reading on the hydra doesn't change, and the motor doesn't react at all.
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10-16-2006, 07:42 PM | #5 |
Former Vendor
Member#: 54918
Join Date: Feb 2004
Chapter/Region:
MAIC
Location: Gaithersburg, MD
Vehicle:673 WHP Element Tuning Pro Comp Engine |
No boost gauges are highly damped so they don't flutter. The internal map sensor will pick up your valves opening and closing.
Clamping the line boost/vacuum line isn't something I would recommend you can see everything you need to see within the software. All this will do is have the Hydra reading 0 and it's not likely going to do much more than run richer. |
10-16-2006, 07:59 PM | #6 |
Scooby Newbie
Member#: 19124
Join Date: May 2002
Location: Northern Colorado
Vehicle:2009 Nissan GTR RED Premium |
so should my tuner go by the map sensors readings? he was sceptical doing that because there was such a huge variation. and its readings were jumping around so much. he has runed on Hydra before and said that he didn't think it was normal.
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10-17-2006, 04:48 AM | #7 |
Scooby Specialist
Member#: 74753
Join Date: Nov 2004
Chapter/Region:
BAIC
Location: Snail Performance
Vehicle:2003 Wrx 2.5Lw/gt30r Team Snail |
Mine does it too its normal just tune with the hydra readings not your boost gauge
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10-17-2006, 10:59 AM | #8 |
Scooby Newbie
Member#: 19124
Join Date: May 2002
Location: Northern Colorado
Vehicle:2009 Nissan GTR RED Premium |
I don't mean to beat a dead horse, I am just nervous about tuning like this.. so if I want to tune for 28 psi, my current situation would have about 36psi on the guage, and the hydra would fluctuate between 28-26 psi.. give or take.. is this correct.. I am assuming this is ok so long as a/f, and timing are ewithin a safe area.. let me know. Thanks again for the replies you have been a alot of help.
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10-17-2006, 11:01 AM | #9 |
Scooby Newbie
Member#: 19124
Join Date: May 2002
Location: Northern Colorado
Vehicle:2009 Nissan GTR RED Premium |
also phil,
If I clamp the line shouldn't the hydra read 0psi-hg? it stays at -588 at idle and doesn't move. |
10-17-2006, 01:24 PM | #10 |
Scooby Specialist
Member#: 27108
Join Date: Oct 2002
Chapter/Region:
MWSOC
Location: Detroit-ish, MI
Vehicle:2004 STi 2004 A4 |
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10-17-2006, 02:40 PM | #11 | |
Former Vendor
Member#: 54918
Join Date: Feb 2004
Chapter/Region:
MAIC
Location: Gaithersburg, MD
Vehicle:673 WHP Element Tuning Pro Comp Engine |
Quote:
Thanks, Phil www.elementtuning.com |
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