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Old 03-07-2006, 10:14 AM   #1
diplo12
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Member#: 64814
Join Date: Jun 2004
Location: 9.8 @ 144 Allboost Praa
Vehicle:
640 whp@32psi Praaa
ALLBOOST!!!

Default Important Question About Hydra Knock Threashold

Hi

My 2004 Sti, The car was tuned some time ago with a gt32
, aps 725 fmic, 720 inj. walbro pump. (Basically a GP-Moto Kit)"by the way This Kit Does not Spool up as they Advertised".

After this I made more mods on the car. Forged pistons, Forged Rods, Fuel Rails, 860 inf, DPR Heads, DPR Cams with AVCS.

After this a data log was performed and found the the Hydra was retarding the car about 9 to 13 deg.

One of my questions is, Should the Threashold be left as it was on the first dyno tune. or should it be raised. If so do you have an idea what it should be raised to?

Thanks
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Old 03-07-2006, 10:35 AM   #2
Element Tuning
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Location: Gaithersburg, MD
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673 WHP Element
Tuning Pro Comp Engine

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No one here is going to tell you to raise your knock thresholds without using some form of knock headset. Forged pistons have little to no impact on the Hydra knock control system but your valve train upgrade most likely can. The problem is that valve train noise is within the same frequency as knock so as valvetrain noise increases so will your recorded knock voltage.

You can purchase a knock headset or you can just pay a tuner who uses a knock headset to adjust them for you.

Good luck.
Phil
www.elementtuning.com
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Old 03-07-2006, 03:23 PM   #3
TOMASCS
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Interesting Topic.
Phil what knock headset do you recomend!?
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Old 03-07-2006, 03:47 PM   #4
Element Tuning
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Tuning Pro Comp Engine

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The TXS Tuner Pro works well or you can make your own, filtered through software or a passive high pass filter.

Thanks,
Phil
www.elementtuning.com
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Old 03-07-2006, 10:26 PM   #5
diplo12
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Join Date: Jun 2004
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ALLBOOST!!!

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Quote:
Originally Posted by Element Tuning
you can just pay a tuner who uses a knock headset to adjust them for you.

Good luck.
Phil
www.elementtuning.com

I don't know some here in PR that use the headset.
Do you know someone here that can do the job?

How about you sir!
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Old 03-08-2006, 04:51 PM   #6
Element Tuning
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Yes, I can do it for you . Talk to Julio as he wants to bring me down there soon.

Thanks,
Phil
www.elementtuning.com
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Old 03-08-2006, 07:23 PM   #7
diplo12
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Good to now!
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Old 07-15-2006, 03:17 PM   #8
thejean
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How well does the knock control work on the Hydra anyway? Is it overly sensitive or not sensitive at all?
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Old 07-16-2006, 10:44 AM   #9
Element Tuning
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It's as overly sensitive or not sensitive at all depending on how you tune the "knock threshold" curve. The system records engine noise and displays it in the "knock threshold" map. You then set the curve base on noise and rpm. The tighter you hug the noise curve the more sensitive it will be. Once you've set this then you can determine how much ignition timing you want the Hydra to pull for each knock count and the maximum amount of timing it will pull. You also set how much fuel the system will add for each knock account. Last but not least you determine at what point the system will go into the "backup spark" map when detonation exceeds a certain knock count and amplitude.

It's the best knock control system I've ever used that utilizes a traditional knock sensor.

Thanks,
Phil
www.elementtuning.com
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Old 07-16-2006, 02:22 PM   #10
thejean
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Thanks Phil. Good information. Does it use its own knock sensor or the factory knock sensor?
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Old 07-16-2006, 02:49 PM   #11
chuckdez
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Obsidian Black Pearl

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Is it possible his timing is advanced through the cams? The Hydra could be compensating for the top-half advance.
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Old 07-16-2006, 08:05 PM   #12
Element Tuning
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Tuning Pro Comp Engine

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You're welcome.

This car just needed the "knock threshold" curve to be customized for the motor. It has since been tuned to over 500 whp on pump gas. This is why it's so important to have a tuneable knock system on a highly modified Subaru.

Thanks,
Phil
www.elementtuning.com
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Old 07-26-2006, 12:55 AM   #13
El Gato
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2005 Hydramist 35R82
93oct 479whp 456tq

Default

Quote:
Originally Posted by Element Tuning
You're welcome.

This car just needed the "knock threshold" curve to be customized for the motor. It has since been tuned to over 500 whp on pump gas. This is why it's so important to have a tuneable knock system on a highly modified Subaru.

Thanks,
Phil
www.elementtuning.com
What is the average voltage that you set the knock threashold on a STi stock long block with a GT35r on the Hydra? I know its different for every car but they should be close to each other. Do you normally use the knock amplifier feature on the Hydra?
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Old 07-26-2006, 12:57 AM   #14
El Gato
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2005 Hydramist 35R82
93oct 479whp 456tq

Default

Quote:
Originally Posted by thejean
Thanks Phil. Good information. Does it use its own knock sensor or the factory knock sensor?
The Hydra comes out of the box to use the factory knock sensor.
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