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PostPosted: Wed Sep 08, 2021 6:59 pm 
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Supercharged
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Location: IRWIN PA
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I have been thinking about possible reasons why my Ruster is somewhat slow off the line.

Since I trashed the distributor back in 2014 or so I have been running fixed timing as I do not have a vacuum feed to the megasquirt... yet

So I was thinking of Drilling the carb and adding a full vacuum feed to the data input of the ms3 so it can get map data.

If I do this I can then run a map based on load and rpm.

Do you think this will be advantageous... getting a better 60' time?

Greg

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PostPosted: Wed Sep 08, 2021 7:51 pm 
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So you have the MS3 only controlling ignition? And the fuel side is a carb?
In Tuner Studio do you have an ignition option to ‘use table’ under the Ignition Settings tab? You should be able to have a variable user defied ignition curve regardless of the fuel setting. My MS3 Pro does not use Map or kPa or a vacuum signal to adjust the timing curve. kPa is an input for constructing the VE and AF tables. But those do not link to the ignition timing table.

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Last edited by DadTruck on Wed Sep 08, 2021 9:15 pm, edited 1 time in total.

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PostPosted: Wed Sep 08, 2021 9:03 pm 
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Location: Park Forest, Illinoisy
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What was your 60' if I may ask Greg?

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PostPosted: Wed Sep 08, 2021 9:08 pm 
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What was your 60' if I may ask Greg?

Leaving off a brake the curve should be irrelevant. Timing should be all in well before launch rpm.

I know my junk was dead to the 60 when I had 38° total in it. 32° really woke it up.

Have you tried leaving off the footbrake to take the 2 step out of the equation? Sometimes it can get so fat on the 2 step and it takes a little while go clear.

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PostPosted: Thu Sep 09, 2021 5:39 am 
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If you control timing with the MAP sensor, you should try it. However, I agree with a high stall converter this really shouldn't matter much at all. Manifold should have a vacuum port/plug on it. I like Dennis' idea. My bet it is the fuel mixture, not ignition.

Lou

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PostPosted: Thu Sep 09, 2021 6:53 am 
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Location: IRWIN PA
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Well Right now the car has MS3 for timing only.

Fuel is run by the carb.
O2 Sensor wires crapped out on me while doing 12 hrs of trailering so I cannot get fuel / O2 data but I would also surmise that with WOT Carb on spark cut it's super rich on the brake/2 step.

I also can do the Transbrake and shut the 2 step off.

I have some experimenting to do, and can definitely go back to the footbrake and try it out.

if I had Electonic injection I could tell MS3 to Cut fuel and spark, but not yet.. it's on the wishlist. Too many cool projects /Ideas and not enough time.
Hey Lou.. need some R&D time on the ITB's?!?!? :D :D

@ Slantzilla - the 60' times are slow like in the 1.66 area - I would like to be ~0.2 Sec's Faster than that.

Greg

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PostPosted: Thu Sep 09, 2021 4:40 pm 
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I'm not sure you have enough steam for a 1.46, but you should get in the mid .50s.

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