First post here! Just picked up my 05' AP2 today(previous ND2 owner), and I noticed that on a very straight road, if I lift off of my throttle the body will roll to the right a bit. It's completely straight if I'm on the gas, but right when I lift off I find my steering wheel wanting to drift right a bit. Is this a problem with my alignment, or could it be some other underlying problem? I couldn't find another thread that was talking about this but if there is, I would greatly appreciate a link. Thanks!

 

Tires are matched brand and model? Correct sizes? Equal air pressures? Equal wear?

Has the car ever been in an accident?

 

Your rear tire pressure is probably not the same from side to side.

 

have a spec alignment- not "its close enough alignment."
darcy

 

I just wanna thank you and windhund, I feel so foolish for not even taking that into consideration. The car came off a transport truck from California (I had a friend test drive and inspect the car for me)to here in Seattle, and when I went to measure it they were 18 psi on the two left and 16 on the right ☠️. She drives perfectly after filling them all up to 32, thanks guys!

 

I observed this throttle steering appear on my AP1 a few years back. It was a drastic change. The OEM tires for the S2000 are run flats, and it turns out that I had a flat. It wasn't obvious because the sidewalls are so stiff. I filled the tire but the problem returned because there was a hole causing a leak.

Anyway, I'm sure you'll notice if your tire loses pressure again. I just wanted to confirm that this is the only time I've had the problem of throttle steering.

 

... and not just a "spec alignment," but a UK Spec Alignment.

Not to hijack this thread, but the UK alignment performs much better than the US alignment.

I ran my AP1 from the day that I bought it new with the US alignment. After I got used to the car, I noticed bump-steer (particularly on the I-90 W to I-5 N ramp). Then I tried the UK alignment and it completely cured the bump-steer.

Note that the throttle steering caused by low tire pressure is completely separate from the bump-steer caused by alignment choice, but since both have been discussed here I wanted to point out the subtleties.

 

No...the factory S2000 tires are not run flat

 

Check tires and alignment as stated. If one shock is blown, then it can allow that spring to compress/rebound faster than the others and make it feel like it is pulling to one side as well.

 

crown in the road?