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Old 04-08-2013, 08:56 AM
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Carb tuning - LM2 csv file

Up and running after going to twin Edelbrock 750's. All jets and springs are the stock settings. Hooked up the LM2 and went for a ride recording the trip. After a good warm up cruise I ran it through 1st gear. Looks pretty good AFR wise but sure there is a little more in there. Would like some input on what to do next. Here's the csv file from the short run in 1st. I have the log from the complete ride if needed and can upload it as the log file or an csv. The LM2 and associated software are really neat! Still learning it's possibles. Had to zip the file because csv's aren't allowed.
Oh, BTW, Going from 2 Holly 450's to Edlebrock 750's really woke this thing up!!

355 CI
11:1
Comp cams XR292R
Duration @ .050 254 intake 260 exhaust
Lift .582 .588
Edelbrock TR1YX tunnel ram 2 x 750 Edelbrocks
Ported double hump 2.02/1.60 3891462 64cc heads
700R4/3500 stall
3.90:1 ford 9"
Race weight 3257
80% Street/ 20% strip car
Attached Files
File Type: zip 040713003st-Session 3.zip (30.5 KB, 39 views)

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Old 04-08-2013, 10:32 AM
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Oh, BTW, Going from 2 Holly 450's to Edlebrock 750's really woke this thing up!!

I keep telling people this.......
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Old 04-08-2013, 10:41 AM
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I don't have the softeware but was able to view the file as a text file.
As you can see the afr's are not very far off, with the default jetting.
Would be nice to get some more pulls in higher gears or accelerating thru more than 1 gear.

1st gear tends to wheel spin.

How is the drivability? throttle response? etc etc driving impression in different modes of driving...

For WOT testing,,, using 2nd gear makes for a longer, smoother test run ,,,, more AFR samples as the engine rpm accelerates slower.

having a manifold vacuum gauge visable while driving is very usefull for seeing the power step up point as you get into the throttle from part throttle cruise.

Last edited by F-BIRD'88; 04-08-2013 at 11:10 AM.
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Old 04-08-2013, 11:14 AM
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having a manifold vacuum gauge visable while driving is very usefull for seeing the power step up point as you get into the throttle from part throttle cruise.

Some log files from full 1/4 mile WOT (@ the track) runs on sticky tires would be great. Keep us posted on your good progress.
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Old 04-08-2013, 02:49 PM
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Originally Posted by F-BIRD'88 View Post
I don't have the softeware but was able to view the file as a text file.
As you can see the afr's are not very far off, with the default jetting.
Would be nice to get some more pulls in higher gears or accelerating thru more than 1 gear.

1st gear tends to wheel spin.

How is the drivability? throttle response? etc etc driving impression in different modes of driving...

For WOT testing,,, using 2nd gear makes for a longer, smoother test run ,,,, more AFR samples as the engine rpm accelerates slower.

having a manifold vacuum gauge visable while driving is very usefull for seeing the power step up point as you get into the throttle from part throttle cruise.
Driveably is great. Guess I'll make some 2nd gear runs on the interstate and even some cruises in 3rd. Will be going to the track later this month and will keep you posted. I'll keep an eye on the Vac gauge too.
LogWorks3 software is available from the innovate website and accel is a free download from MS.
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Old 04-09-2013, 04:13 PM
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When 1/4 mile track tuning the carbs. The track MPH will not lie to you.
(keep your foot in it) more MPH means more power.

The AFR gauge is just a guide. Give it what it wants to go fast. (MPH)

I would start by making 3 base line runs. Then, increase all the main jets by .003" .004" and test again.
Consistant driving is required. (Keep your foot in it) It will either go faster slower or the same. Your reaction time does not count. The ET don't mean much....its all dependent on driving.... tune the carbs for best 1/4 mile MPH.

Make 2 more passes.

The car will show you what makes more horsepower.MPH.... The gauge is a guide. Look at ALL the plugs too.
The gauge and plugs appearance is a guide not a absolute.
On the plugs you are looking for excess heat or detonation.

make only ONE change at a time. If it wants more fuel (goes faster with bigger jets) give it what it what it wants.

tuning for ET comes latter. An as you can see these 750 eddy carbs are not that far off, out of the box.

A windy gusty day can mess with the MPH.
your 1/8th MPH,,, 1000 ft MPH and 1/4 MPH are all good power indicators.

Last edited by F-BIRD'88; 04-09-2013 at 04:27 PM.
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