Help me figure out what’s happening here! - Ford Mustang Forums : Mustang Forum
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post #1 of 2 Old 07-06-2018, 04:16 PM Thread Starter
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Help me figure out what’s happening here!

I’m having some problems using Livelink gen2 datalogging and trying to see a little more in depth what my car is actually doing during an 1/8th mile pass.

On my graph I highlighted rpm and vehicle speed. The issues I’m having is a what I can hear during a video of the pass is a slight bog in the 1-2 shift. Using math the 4r70 gear set shows it should be a reduction of 55% rpm.

I’m launching at what is showing 4100rpm and it climbs to 6470 (rev limit) where speed tapers off a few mph. Rpm drops to 5374rpm before climbing back to 6350rpm when I shift to second. 3668rpm is the lowest rpm it drops to. Not knowing exactly where I shifted at that point still puts me well within reason of 55% drop in rpm.

I also set up a bookmark that marks my 1.66 60’ et which shows the car has just hit redline and vehicle actually starts tapering down on speed before recovering.

My question is, am I looking at this information correctly first of all, second of all, and more importantly, how do I keep my vehicle speed in an upward motion throughout the whole pass? I think from the data I can assume at the top end of 1st gear where speed tapers off that I lose traction and once I bounce off limiter the speed and rpm drop, before climbing slightly again before the shift. If the engine at redline drops 55% rpm to second gear, 3575rpm drops it out of its torque curve a bit hence the bog, so it seems like nothing short of a different 1st gear ratio is going to help. Thanks guys!

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post #2 of 2 Old 07-06-2018, 04:18 PM Thread Starter
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Here’s a screenshot of the data log

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