 tuning FI via CHTs |
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| bd1308 |
 Oct 10 2006, 10:32 PM
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#1
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Sir Post-a-lot  Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501  |
If I drive the same speed on the same road and tune to get 250-375 in the flat going 75 i'm good?
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| bd1308 |
Oct 10 2006, 10:44 PM
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#2
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Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
I get the black dial gear thing, and how it adjusts the slope of that logarythmic function thing, but adjusting the idle CO mix seems to affect part-cruise settings...
I keep chasing my tail on that. |
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| Joe Ricard |
Oct 11 2006, 04:51 AM
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#3
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CUMONIWANNARACEU Group: Members Posts: 6,811 Joined: 5-January 03 From: Gautier, MS Member No.: 92 |
Get a wide band A/F meter. you can infinately tune your car.
CHT will not give you much info. EGT can be a helpfull tool tuning WOT. you would be amazed at how different each cylinder runs. Lots pf power hiding there. |
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| Jake Raby |
Oct 11 2006, 06:21 AM
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#4
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
I now rent out the LM-1 wideband AFR kit through the Type 4 Store..
Tuning with CHT isn't that effective.. EGT is the mega tuning tool, not just for enrichment, but also for optimizing timing.. |
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| bd1308 |
Oct 11 2006, 06:22 AM
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#5
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Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
Whats ballpark $$?
i cant find it in the search function |
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| Jake Raby |
Oct 11 2006, 06:28 AM
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#6
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Its not enabled on the store yet.
I'll get it done later today after the server is finished being backed up.. |
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| bd1308 |
Oct 11 2006, 06:30 AM
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#7
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Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
Ah yes,
Always do your backups! |
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| jd66921 |
Oct 11 2006, 07:40 AM
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#8
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Member Group: Members Posts: 316 Joined: 9-January 06 From: Texas Member No.: 5,394 |
I've written about this before, but I installed a potentiometer in place of the
CHT in an L-Jet. I used a 5k pot beciause I had one, and I can adjust it as I drive. I use the CHT gauge to set it. I have found that at sea level where I live,about 1,8 k ohms gives a running temperature of 370 degrees +/-. Lower resistance seems to produce a lot more heat. I do have holes in my engine tin, no heater hoses, and a cutout on the starboard side for the non-existent AC compressor. The car is quite senstive to the resistance. I theorize that I am adjusting the mixture, lower resistance is leaner. I do not have an AFR but I think I'd put one in a new engine, if I can afford to build one. I'd love to know what I am actually adjusting! Jeff |
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