too rich costs power?
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single digit dreamer
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From: omaha ne
too rich costs power? check out this article and post up your thoughts. i hear most often i should be running around 11.5-1 a/f or so but a few people have told me more up in the 12.3-12.5 range.
http://www.innovatemotorsports.com/resources/rich.php
http://www.innovatemotorsports.com/resources/rich.php
There is soo many factory as to what afr you should run. In the case of your truck I would start tuning with 11.5-11.8:1 at peak torque then lean it out to 12.0-12.5: at peak hp. It takes time to get it just right.
too rich too lean too much timing not enough it all can hurt power 
Being a heavy truckId take the airfuel to where most seem to like but leave your timing a little conservative
Being a heavy truckId take the airfuel to where most seem to like but leave your timing a little conservative
Originally Posted by GrannySShifting
too rich too lean too much timing not enough it all can hurt power Being a heavy truckId take the airfuel to where most seem to like but leave your timing a little conservative
Being a heavy truckId take the airfuel to where most seem to like but leave your timing a little conservative
Tom
12 Second Truck Club
Joined: Oct 2002
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From: Salt Lake City, Utah
Originally Posted by parish8
check out this article and post up your thoughts. i hear most often i should be running around 11.5-1 a/f or so but a few people have told me more up in the 12.3-12.5 range.
http://www.innovatemotorsports.com/resources/rich.php
http://www.innovatemotorsports.com/resources/rich.php
I'd also like to know what is better. I'm running 11.3-1 with 17 degrees of timing. Would it make more power at 12-1 with 15 degrees?
Parish, since it's so easy for you to change your tune with megasquirt, why don't you do a test.
--G-tech at 10 psi, 11-1 air fuel, and as much timing as it will take without KR
--G-tech at 10 psi, 12.5-1 air fuel, and as much timing as it will take(I'm assuming it will take less timing?)
Generally stuff in the 12:1 AF or leaner tends not to have as much cushion.
But timing makes power.
I'd tune a max effort ride to 11.5:1 and as much timing as makes sense.
But timing makes power.
I'd tune a max effort ride to 11.5:1 and as much timing as makes sense.
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Agree with more fuel to peak torque then lean her out some for peak HP. Dyno at current settings, logging AFR then adjust accordingly. Once you get fuel dialed, tweak the timing, add a little here and there s needed and you combo will be dialed in!
Good luck.
Charlie
Good luck.
Charlie
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single digit dreamer
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From: omaha ne
i think i will do some testing but it is suppose to snow the next couple of days.
i will try just what you sugested. 11.0-1 and vary my timing from 12-20deg or so and see what pulls the best, ALWAYS WATCHING FOR KNOCK.
then goto 12.5max but probably more like 12.2 or 12.3 and do the timing again. keep the runs all the same and just look at my 60-100 ET.
there are a lot of theories on timing too. i like the theory where it isn't "the most you can run without knock" as it is "the timing that makes the best power"
i will try just what you sugested. 11.0-1 and vary my timing from 12-20deg or so and see what pulls the best, ALWAYS WATCHING FOR KNOCK.
then goto 12.5max but probably more like 12.2 or 12.3 and do the timing again. keep the runs all the same and just look at my 60-100 ET.
there are a lot of theories on timing too. i like the theory where it isn't "the most you can run without knock" as it is "the timing that makes the best power"
12 Second Truck Club
Joined: Oct 2002
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From: Salt Lake City, Utah
Originally Posted by parish8
i think i will do some testing but it is suppose to snow the next couple of days.
i will try just what you sugested. 11.0-1 and vary my timing from 12-20deg or so and see what pulls the best, ALWAYS WATCHING FOR KNOCK.
then goto 12.5max but probably more like 12.2 or 12.3 and do the timing again. keep the runs all the same and just look at my 60-100 ET.
there are a lot of theories on timing too. i like the theory where it isn't "the most you can run without knock" as it is "the timing that makes the best power"
i will try just what you sugested. 11.0-1 and vary my timing from 12-20deg or so and see what pulls the best, ALWAYS WATCHING FOR KNOCK.
then goto 12.5max but probably more like 12.2 or 12.3 and do the timing again. keep the runs all the same and just look at my 60-100 ET.
there are a lot of theories on timing too. i like the theory where it isn't "the most you can run without knock" as it is "the timing that makes the best power"
ya you can plateau on timing. I noticed it on my last dyno. We kept adding timing and still with no KR there was a dip in power. On my truck it does seem to like having more fuel down low and a bit leaner on top.
A/F I bet it is the same deal with a turbo, but just pondering here...A turbo runs off of exhaust heat and leaner burns hotter. Would you want a bit leaner down low for spool up? I haven't read anything about this, and it probably isn't the right line of thought even though in theory it may sound good.
A/F I bet it is the same deal with a turbo, but just pondering here...A turbo runs off of exhaust heat and leaner burns hotter. Would you want a bit leaner down low for spool up? I haven't read anything about this, and it probably isn't the right line of thought even though in theory it may sound good.
Make power with spark, keep things cool with fuel
While you might be tempted to run at LBT for power, the EGT's might be to high for the exhaust valves to live.
I personally spark it to make power, and add fuel to keep the EGT's below 1650° at the port. Just my $.02
While you might be tempted to run at LBT for power, the EGT's might be to high for the exhaust valves to live.
I personally spark it to make power, and add fuel to keep the EGT's below 1650° at the port. Just my $.02
Originally Posted by y2khawk
Make power with spark, keep things cool with fuel
While you might be tempted to run at LBT for power, the EGT's might be to high for the exhaust valves to live.
I personally spark it to make power, and add fuel to keep the EGT's below 1650° at the port. Just my $.02
While you might be tempted to run at LBT for power, the EGT's might be to high for the exhaust valves to live.
I personally spark it to make power, and add fuel to keep the EGT's below 1650° at the port. Just my $.02
As a motor gets near peak effeciency timing requirements usually will drop. max inj pulsewidth will be right where torque peaks
Originally Posted by GrannySShifting
Damn Matt you run the EGTs that high? What fuel?
As a motor gets near peak effeciency timing requirements usually will drop. max inj pulsewidth will be right where torque peaks
As a motor gets near peak effeciency timing requirements usually will drop. max inj pulsewidth will be right where torque peaks
You melt **** before it ever detonates
