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Old 08-25-2015, 12:33 PM   #1
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Understeer with new zero offset wheels

I bought a set of 15x7" Enkei Old School wheels, and and mounted brand new 225/50/15 Kumho Ecstas. The tires stick out at least 2" from the fender. Since then I've noticed if i try to steer hard into corners, I get what feels like understeer. I also happen to be a licensed Ford Service Tech, and its my job to diagnose these issues. I'm wondering if anyone has been in this sitch.
Also, I've done a couple mods near the same time. I've installed the SVTF suspension kit (new), and I made a front wind splitter that sits about 4" lower than the bumper, with an air dam. I had the splitter and suspension kit on before the tires, and didn't have understeer.
Hopefully someone can help me narrow this down.
I've been leaning towards sway bar strength issue, any help is appreciated.



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Old 08-25-2015, 04:58 PM   #2
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Moved to Brakes, Suspension & Chassis for more looks.
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Old 08-26-2015, 03:51 AM   #3
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did u do an alignment since the new suspension?
with those wheels, your scrub radius would have change significantly.
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Old 08-28-2015, 11:32 AM   #4
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I forgot to mention that.. I went to do an alignment after this issue.. every measurement was dead on, I was amazed. Caster, camber, and toe are all within spec. Is scrub radius able to be observed?

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Old 08-28-2015, 09:33 PM   #5
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Hard to measure, for McPherson struts it relates to the difference between where a line from the strut mount through the ball joint hits the ground vs. where the center of the tire touches the ground.

Changing offset unless proportional to a change in rim width will change the scrub radius.

Prob. best to google it for diagrams & descriptions of how it can affect steering feel/feedback.
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Old 09-01-2015, 10:30 PM   #6
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Perhaps you are feeling an increase in steering self-centering.
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Old 09-02-2015, 06:29 AM   #7
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I'll tell ya right now those Kumho's suck major for grip, though I was still able to place 1st and 2nd on an extremely bald set, but as soon as I switched to some Dunlop DZ102's it was apparent how lacking the Kumhos were in every way.
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Old 09-02-2015, 11:59 AM   #8
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Quote:
Originally Posted by Pauly_D View Post
I forgot to mention that.. I went to do an alignment after this issue.. every measurement was dead on, I was amazed. Caster, camber, and toe are all within spec. Is scrub radius able to be observed?
The alignment specs from ford are pretty lenient, you can try to dial them in more precisely using this as your guide:
Foci eating tires?
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