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All Spooled Up
 
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
I view a knock counter as the most important "gauge" that you could possibly add to one of these (or other turbo) cars, for heading off possible engine destruction. But I would put it where you can see it - NOT inside of the glove box. Mine is under the dash, just left of the center console, but I MAY put it IN the console. Since I am a "creative solutions" type of guy, I used a counter that I already had. It is a Red Lion Controls Cub3, with built-in reset. It is powered by 2 internal (and replaceable) "N" cells - good for several years of power. It needs a generic NPN switching transistor for the knock signal to be able drive it, because it is really designed to be driven by the signal from opening/closing contacts. And the pressure switch is out of a front-loading washing machine that I scrapped. It has both NC and NO contacts that, after adjusting it up to max, closes the knock count circuit at around 2psi. It is teed into the line going into the KLR. In my opinion, maybe 4 or 5 counts after a 10 second+ full boost run is acceptable, but more than that is starting to push it.
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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)
Old 07-21-2010, 10:51 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #21 (permalink)
your average wrencher...
 
Join Date: Oct 2007
Location: Bedford, PA
Posts: 1,365
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just installed my vitesse setup and added the counter.....only 2....maybe 3 counts going hard through each gear. more noticible in lower gears though and sometimes on a downshift I get one. I put mine above my cd player but it is temporary there though...
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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 07-21-2010, 03:57 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #22 (permalink)
All Spooled Up
 
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
Assuming that everything else is up to to snuff, the one thing that can "get" you before you realize it, is intercooler heat soak, as it did me, in the 88 T-bird turbocoupe that I used to have. After 10 (summer) to 15 (winter) seconds of full boost, the IC became incapable of cooling the hot air charge being expelled by the the small IHI RHB-52 turbocharger that I had running way out of it's efficiency range. Now the IC setup on those cars was far from ideal (small, and not front-mounted), but the IC's on these cars isn't exactly big, either. But it is front mounted, so after 10 seconds of full boost, you should be going fast enough to be getting quite a bit of air flow through it, lessening the possibility of heat-soaking it. But it is something that you might want to be mindful of, especially if the fuel that you happen to be running is so-so.
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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)
Old 07-22-2010, 09:08 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #23 (permalink)
your average wrencher...
 
Join Date: Oct 2007
Location: Bedford, PA
Posts: 1,365
Garage
true.....an intercooler upgrade is already in the works....
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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 07-22-2010, 04:47 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #24 (permalink)
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Join Date: Dec 2013
Location: atlanta,GA
Posts: 232
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Quote:
Originally Posted by running_cold924 View Post
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
Thank you! Just did this and after making up the connector, was a bit put off when i could not find the diagnostic plug.
Old 02-10-2018, 08:07 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #25 (permalink)
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