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knock counter

originally posted by lleroyb. original thread can be found here;
http://forums.rennlist.com/rennforums/showthread.php?t=346321

the digital counter can be obtained from here for $12.50;
http://www.skycraftsurplus.com/index.asp?PageAction=VIEWPROD&ProdID=1001

Thanks to Samluke and others for the ideas and the display. I came up with a more or less permanent installation for a knock counter and blink code indicator. It requires drilling a few holes and a slot in the glove box but other than that is totally reversable. You have to open the glove box to see it or use it.

When I was using the temporary set up in the other thread I was not getting any counts.

On the way back from Wallace Idaho I started getting a dozen or so counts per full throttle & boost run. I think I got some low grade gas. When the tank went to half full I filled it again with 91 octane. I still got some counts but only two or three. I put some octane booster in and got one count running up though second and part of third up a hill, I got one count. Once this tank is low I will try again with all new gas.



















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Last edited by nize; 10-03-2008 at 09:21 AM..
Old 09-30-2008, 08:56 AM
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'89 turbo-s (2.7, wolf3d ems, garrett dbb turbo, tial 46mm, etc. fast!)

Last edited by nize; 10-03-2008 at 09:21 AM..
Old 09-30-2008, 08:56 AM
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Very nice job Peter! Now you can keep an eye on various fuels/outlets and octane/boost etc I assume that none of these counts are audible when driving?
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Old 10-01-2008, 12:49 PM
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this is a setup and photos for a local buddy. and you are correct in that none of these counts are audible when driving. if you can actually hear engine knock, it's far too late!
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'89 turbo-s (2.7, wolf3d ems, garrett dbb turbo, tial 46mm, etc. fast!)
Old 10-01-2008, 03:08 PM
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Great.. another project for this winter .

Im wondering, how do you reset the counter? Interrupt power to it or is there a switch for it on the counter itself?
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Old 10-02-2008, 10:28 AM
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sadly, there's no way to re-set this particular counter.
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'89 turbo-s (2.7, wolf3d ems, garrett dbb turbo, tial 46mm, etc. fast!)
Old 10-02-2008, 10:57 AM
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I know knock and pinging/pinking is not the same but they're pretty closely related. The noise you can hear when you've got some poor octane fuel, under load up a hill or overboosting. Does this get counted?
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Old 10-02-2008, 05:52 PM
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yes. you'd be surprised how many knock counts are detected even when you can't hear any knock at all (it's in the hundreds). it's very easy to tell if you've got bad gas with this counter installed.
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Old 10-02-2008, 06:28 PM
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Sounds like a good addition.
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Old 10-02-2008, 07:46 PM
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You can rid yourself of those pesky low load counts by using a Hobbs switch so it only counts while under higher boost.

You just tap into the power circuit and then install a power switch to read out while sitting still if wanted.

Fortunately, I have found that once using e85 full time , the counts are so minimal that the counter is not as necessary unless running on the edge of lean. If I were using reg fuel this item would be invaluable
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Old 10-03-2008, 06:58 AM
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Yep - Sid came up with a good way of ignoring the useless low-load knock counts.


-Rogue
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Old 10-06-2008, 11:37 AM
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Quote:
Originally Posted by Rogue_Ant View Post
Yep - Sid came up with a good way of ignoring the useless low-load knock counts.


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Heheheh, yes he did. No low load!
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Old 10-07-2008, 04:47 AM
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Lol, not quite what I meant


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Old 10-07-2008, 10:55 PM
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I was looking at the Hobbs switch choices. Not familiar with the options. Can you recommend a unit (car runs to ~15PSI).

Thx
Old 11-10-2008, 11:29 PM
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I don't have the part numbers handy, but what would be my suggestion is to check at NAPA and get a Normally Open 10psi switch.

Or you could get the 4 psi switch However I don't recall whether I was seeing the "non issue" counts from 4 to 10.

Check here this is through the grainger site however I think NAPA uses the same part number

here is the data sheet. see page 5

76576 is the 10 psi
76575 is the 4 psi
either can be adjusted a couple psi either direction
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splitting my obsessions with a crow bar.
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Old 11-11-2008, 07:45 AM
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Thanks Sid. I'll likely try the 10PSI switch with the NO option. (now understand the NO vs. NC choice!)

Final question - where in the boost track would you attach the switch? I'm thinking the most likely place would be somewhere off the intake manifold. Before drilling holes, maybe I could T it into one of the major pressure lines off the manifold?

Any hints or suggestions to help my thinking?
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jeff, i'd use the 4psi switch and not the 10psi. you want to detect knock if it exists above 5psi.
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Old 11-11-2008, 12:33 PM
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Anywhere in the tract will be fine as long as it is not after the one-way valve for the brake booster

pressure would be preference IMO and and based also on the type of fuel you run.
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splitting my obsessions with a crow bar.
87 DD Black 951 Holset HX40-35 custom garrett turbine, Ford MAF, Rogue tuned,SLM stroker, best ET 11.4..best mph 127
Old 11-12-2008, 07:18 AM
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having trouble trying to find that connector...anybody have an 86 that they've done this to?
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Old 07-17-2010, 08:57 PM
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think i have it, it is behind the glovebox on the post that hold the rear of the glovebox. hooked it up and it turns on....will post knocks later
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1986 951 Garrett turbo, Rogue Tuned.
1987 944S chipped, konis, rollbar (traded)
1979 924 total rebuild and blueprinted (sold)
1988 XJ 5in lift,long arms, 4.6 stroker, ax-15 w/ 35s
1995.5 Audi S6 Full RS2 bolt-ons, EFI tuned.
Old 07-18-2010, 09:41 AM
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