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1G Timing and IDLE

Adrian97

Proven Member
98
2
Mar 3, 2018
Göteborg, Europe
Hello i want to set timming tomorrow and I saw this post
" Base Idle & Base Timing affect each other - IMO due to the weird ass angle we have to view the Marks from when you are squatting down & peeking thru the belts & "see" 5 BTDC you are really set at about 7 BTDC - SO when you see 2.5 BTDC it's actually about 5 IMO - I try to be in the same position/angle whenever I set mine halfway between 5 & 0 BTDC & IMO that is 5 in the real world & "seeing" 0 would be 2.5 BTDC real world IMO... BTW on my Pocketlooger I'm pulling 22 - 25 advance at WOT (Tuning guide reccommends NO LESS than 15 at WOT) & see as much as 46 degrees advance on Pocketlogger in some throttle positions - ZERO knock on 92 or 93 Octane in Winter (which of course means I could bump up Timing OR Boost) - but it runs great & I don't want to fry this old Turbo quite yet - seeing 13 PSI on POS Stock gauge. "
here is the link: https://www.dsmtuners.com/threads/timing-adjustment.278448/ post #3
Does it mean that i need to set my timming to 2,5 BTDC on the harmonic balancer or 5BTDC like every one? I want to be at 5 BTDC.

And second question: When i set idle at 900 which accessories off lights,fans.... so when I turn accesories on it should fall to ex. 750, and stay or grow up to 900 ?
 

pauleyman

DSM Wiseman
6,931
1,956
Nov 19, 2011
oklahoma city, Oklahoma
Weird angle? I didn't think so. Also the Mark is clear under a timing light and it's designed to be very close to the scale. I've had no problems and make no "adjustments"
 

Cherry

Proven Member
249
54
Jun 16, 2019
Hull, Georgia
From my understanding you want to do all the groundings to set the idle and set it to 750rpm. The reason you ground the 2 pins out is to put the ISC in its neutral state. After the car is shut off and the grounds removed the ISC is supposed to keep it at 750rpm give or take 50-100rpm. If you set it to 900rpm the computer will control the ISC to try to keep it around 900rpm.

That is my understanding of it from the vfaq. It's not like an older car with a choke and you just set the idle and basically forget it but I wish it was like that. But we have electric fans that contribute to power drain as well as the ac pump and the computer is supposed to counteract those turning on by allowing more air into the engine.
 

Adrian97

Proven Member
98
2
Mar 3, 2018
Göteborg, Europe
Ok , my car idles at 900 which accesories Off and 750 which accesories ON. So something is wrong.
 

steve

DSM Wiseman
13,884
942
Feb 3, 2002
Boulder, Colorado
If you set it to 900rpm the computer will control the ISC to try to keep it around 900rpm.
Only if you have changed the programmed idle in the software, otherwise the ECU will try to lower the idle back to 750 and that may drive the ISC out of range.

Ok , my car idles at 900 which accesories Off and 750 which accesories ON. So something is wrong.

Yes, If your car idles at 900 rpm and drops under load to 750 rpm there is something wrong...
 

Adrian97

Proven Member
98
2
Mar 3, 2018
Göteborg, Europe
I will try reset BISS screw i and adjust idle agian to 750, maybe someone seti it to 900 and ecu try to lower the idle back.
 

steve

DSM Wiseman
13,884
942
Feb 3, 2002
Boulder, Colorado
Ah makes sense. I take it you would only be able to do that with an eprom ecu with link or a stand alone system?

I assume you are referring to my comment on idle speed. It's a part of the ECU programming, so you need either a EPROM ECU, one of the Mitsubishi flash based ECU's, or a third party standalone ECU to reprogram it.

The software has a table of target idle speeds depending on coolant temp and adjusted based on various loads like the AC is on, or power steering is being used, you're coasting, If the car is an auto and in drive, etc. As I've discussed before, when the Idle position switch is closed the ECU will try to manage the engine speed using the ISC/IAC and ignition timing. The only way the engine will idle at another rpm is by disabling the inputs telling it to idle, or the devices it uses to control it, or the software that sets it.
 
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