LT4 KM worth it??
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Joined: Aug 2003
Posts: 205
LT4 KM worth it??
I have been reading up on what the KM does and everything and I've read that loud exhaust can mess the reading up on them sometimes. Well about a year ago I got a flowmaster muffler and cut the cat off and its pretty loud now. And I noticed that it gained power but at about 5000 or 5500 it seems to strain if you know what I mean it does pull like it should. Is this because of the KM and should I get the LT4 KM??
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Joined: Dec 1969
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From: San Diego, CA
Re: LT4 KM worth it??
Not only do you need to know if you're getting knock, but you need to know if it's false knock (caused by mechanical vibrations like exhaust or RRs). You can distinguish false from true knock by bumping up the octane (race fuel) to see if the knock disappears. If higher octane "cures" the knock, then you have true knock and need to cure your problem (tune up). If it's false knock, the LT4 KM can help as it's tuned to ignore RR noise (LT4 engines came with RRs).
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Joined: Jun 2002
Posts: 452
From: UCF
Re: LT4 KM worth it??
Originally Posted by OBE1 95Z28
Not only do you need to know if you're getting knock, but you need to know if it's false knock (caused by mechanical vibrations like exhaust or RRs). You can distinguish false from true knock by bumping up the octane (race fuel) to see if the knock disappears. If higher octane "cures" the knock, then you have true knock and need to cure your problem (tune up). If it's false knock, the LT4 KM can help as it's tuned to ignore RR noise (LT4 engines came with RRs).
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Joined: Jul 2005
Posts: 297
From: Wisconsin
Re: LT4 KM worth it??
Just for reference all I had was a magnaflow catback, The car was anbolute big in the higher rpm range. So I used datamaster and found out it the PCM was pulling over 10 degrees at pretty much any rpm over 4k, so I got the LT4 km and now my problem is solved.... 
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Joined: Sep 2005
Posts: 2,271
From: Bahrain
Re: LT4 KM worth it??
Originally Posted by z28_theantirice
Just for reference all I had was a magnaflow catback, The car was anbolute big in the higher rpm range. So I used datamaster and found out it the PCM was pulling over 10 degrees at pretty much any rpm over 4k, so I got the LT4 km and now my problem is solved....
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Joined: Jul 2005
Posts: 297
From: Wisconsin
Re: LT4 KM worth it??
Originally Posted by Honda Hunter
If it's pulling 10 degrees what will it say? Datamaster told me "Spark Retard = 5.0" so does that mean 5 degrees being pulled?
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Joined: Aug 2003
Posts: 2,925
From: Detroit
Re: LT4 KM worth it??
Originally Posted by 2000GTP
For the 35.00 to 40.00 bucks they go for, it cant hurt to have one.
Originally Posted by chevelles101
could you tell any difference by your sotp meter?
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Joined: Aug 2002
Posts: 469
From: Buffalo NY
Re: LT4 KM worth it??
Originally Posted by JoeliusZ28
agree
i couldnt, but people on this board have claimed as much as a tenth off the quarter on a stock car
i couldnt, but people on this board have claimed as much as a tenth off the quarter on a stock car
I'm claiming much more, I trimmed a full second with it and 3 minutes of tuning. The car was pulling 22 degrees of timing, basically shutting off in my power band, and with an LT4 KM and a degree here or there adjusted, I went from 14.0 to 12.9 at the time
results may vary
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Joined: Aug 2003
Posts: 2,925
From: Detroit
Re: LT4 KM worth it??
Originally Posted by Bad AZz Z28
I'm claiming much more, I trimmed a full second with it and 3 minutes of tuning. The car was pulling 22 degrees of timing, basically shutting off in my power band, and with an LT4 KM and a degree here or there adjusted, I went from 14.0 to 12.9 at the time results may vary
results may vary My car needs a tuning along with a tuneup pretty bad, Im hoping for similar results.
Thread Starter
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Joined: Aug 2003
Posts: 205
Re: LT4 KM worth it??
Anyone instrested in getting one there's a good deal on ebay http://cgi.ebay.com/ebaymotors/Corve...QQcmdZViewItem
Last edited by JAG05; Sep 17, 2005 at 02:57 PM.