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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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Is there really 2 knock sensors?
I just noticed that PP lists these ( 944-606-145-00-M14) as 2 being required per car. I only ever noticed one on my 89 turbo - under the intake, near the ISV. Where is the other one located?
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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11-21-2010, 06:07 AM
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Rogue Tuning
Join Date: Feb 2007
Location: Denver
Posts: 448
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There is only one knock sensor on the 951, regardless of year.
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-Joshua www.RogueTuning.com |
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11-21-2010, 06:49 PM
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Registered
Join Date: Nov 2007
Posts: 45
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I believe the second knock sensor was used on 3L cars (but don't quote me).
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Darwin 1988 Porsche 944 Turbo S 944 Enhancement 3.1L SFR//TecGT//Vitesse//LEDA |
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11-21-2010, 10:29 PM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
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Pelican Parts - Product Information: 944-606-145-00-M14
They seem pretty adamant about the turbo having 2 of them That's why I asked. But it now appears obvious that it IS a mistake.
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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11-22-2010, 03:55 AM
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Super Moderator
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there is a spot next to the single factory knock sensor to accommodate a second knock sensor, but it's taken up by the factory ISV bracket (i think, will have to double check). i'm actually planning to relocate the ISV bracket, and install a second knock sensor just as a failsafe.
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'89 turbo-s (2.7, wolf3d ems, garrett dbb turbo, tial 46mm, etc. fast!) |
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11-22-2010, 09:44 AM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
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That doesn't sound like a bad idea. Is there a connector for the 2nd one?
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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11-22-2010, 06:28 PM
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Rogue Tuning
Join Date: Feb 2007
Location: Denver
Posts: 448
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Quote:
Quote:
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-Joshua www.RogueTuning.com |
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11-22-2010, 10:06 PM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
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If commencing such a mod, would you just wire it in parallel with the other one? Wouldn't that throw the sensitivity off? Or does it it need a separate line to the DME? If so, will the DME be able to read it without modification of the firmware?
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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11-23-2010, 05:07 AM
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Rogue Tuning
Join Date: Feb 2007
Location: Denver
Posts: 448
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The DME does not monitor knock, rather the KLR does.
Adding a second knock sensor is not an option for the DME/KLR... nize is running a stand-alone engine management setup, so what he does is not a point of reference for anyone running the DME/KLR.
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-Joshua www.RogueTuning.com Last edited by Rogue_Ant; 11-27-2010 at 01:48 AM.. |
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11-23-2010, 02:03 PM
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All Spooled Up
Join Date: May 2009
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How does the S2/968 handle the 2nd one then?
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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11-23-2010, 03:59 PM
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Rogue Tuning
Join Date: Feb 2007
Location: Denver
Posts: 448
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Completely different DME.
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-Joshua www.RogueTuning.com |
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11-23-2010, 04:03 PM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
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I c.
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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11-23-2010, 05:22 PM
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Rogue Tuning
Join Date: Feb 2007
Location: Denver
Posts: 448
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Furthermore, on an inline-4 cylinder I don't see much of a point to adding a second knock sensor... There are only two ignition events per revolution, with good separation, so one knock sensor, placed reasonably, should be quite sufficient at picking up knock.
Adding a second knock sensor, especially so close to the first is only good for a redundancy-type of setup - in which one knock sensor fails (highly uncommon).
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-Joshua www.RogueTuning.com |
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11-27-2010, 01:52 AM
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Super Moderator
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i'm installing the second one for redundancy, in case the first sensor fails.
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'89 turbo-s (2.7, wolf3d ems, garrett dbb turbo, tial 46mm, etc. fast!) |
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11-29-2010, 11:15 AM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
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Since I am using stock engine management hardware , I have no choice but to stick with a single one. That's fine though.
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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11-30-2010, 04:31 AM
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