set the timing.
Le Mans Master
Joined: Jul 2002
Posts: 5,818
Likes: 2
From: Alive and well in Burlington NC
Re: set the timing. (devilfish)
6 degrees before tdc is stock right? Has anyony tried 8-10 degrees?
regards
regards
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: set the timing. (devilfish)
I run about 8deg BTDC with the stock CalPac and see no knock retard on the scanner.
Any more and the ECM will pull timing near the shift points due to ping; of course I'm running 91/93 octane and have a 160 deg stat & fan sw.
You realy need a scan tool or use trap speed to see when timing is pulled or HP drops off to find the sweet spot.
Any more and the ECM will pull timing near the shift points due to ping; of course I'm running 91/93 octane and have a 160 deg stat & fan sw.
You realy need a scan tool or use trap speed to see when timing is pulled or HP drops off to find the sweet spot.
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
Re: set the timing. (rainsux89)
6* BTDC is the stock setting. Some of us have had luck going higher, some have had to go lower. No 2 engines are identical. The only way to really know yours likes is to slap on a scan tool and watch knock retard through the RPM band or hit the track and watch your MPH between runs.
That being said I started at 6* one night and made a pass. I changed it to 8* and made another pass gaining 1mph. I bumped it again 9* and made another pass gaining another 0.5mph. So with 3* I gained 1.5 mph and about 0.1 in ET. All 3 passes had nearly identical short times and 1/8s, but the last 1/8 was stronger.
Now I just have to wait for ski_dwn_it to come in and yell at me telling me that my proof is flawed. ;) :D
That being said I started at 6* one night and made a pass. I changed it to 8* and made another pass gaining 1mph. I bumped it again 9* and made another pass gaining another 0.5mph. So with 3* I gained 1.5 mph and about 0.1 in ET. All 3 passes had nearly identical short times and 1/8s, but the last 1/8 was stronger.
Now I just have to wait for ski_dwn_it to come in and yell at me telling me that my proof is flawed. ;) :D
Safety Car
Joined: May 1999
Posts: 3,651
Likes: 5
From: Atlantis
Cruise-In I Veteran
Re: set the timing. (scorp508)
I just changed mine from 6 to 8 degrees.
Engine "feels" a lot better.
AutoXray IS showing a few more knock counts with the 91 octane fuel I can get around here.
I haven't seen much knock retard (3-4 degrees) on WOT runs so I'm going to leave it at +8 for right now.
May sneek it up to 10 if all appears well for the next couple of weeks.
Engine "feels" a lot better.
AutoXray IS showing a few more knock counts with the 91 octane fuel I can get around here.
I haven't seen much knock retard (3-4 degrees) on WOT runs so I'm going to leave it at +8 for right now.
May sneek it up to 10 if all appears well for the next couple of weeks.
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 3,010
Likes: 1
From: Sweden/Stockholm
Re: set the timing. (VetNutJim)
ok. So start with 6 and look for counts, then start testing higher and higer?
Is knock count all I need to worrie about, or should I test the new settings on the track aswell?
thanks for your answers :)
Is knock count all I need to worrie about, or should I test the new settings on the track aswell?
thanks for your answers :)
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Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Re: set the timing. (devilfish)
As far as performance goes, I've heard, that retarding a bit will get you more power at low speeds, and advancing will get you a little more at higher speeds... assuming no pinging occurs.
I'm sure all the guys that actually know what they're talking about are :sleep:
I'm sure all the guys that actually know what they're talking about are :sleep:
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
Is knock count all I need to worrie about, or should I test the new settings on the track aswell?
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
Re: (devilfish)
so whats the deal with base timing vs setting the timin in the computer?