Bad straightahead-line drive

[Werner]

Hello everybody,

my roadster has a strange problem: the straight-line drive is not good. I renewed therefore the bearing shells on the steering wheel transmission and the tie rods. The tie is adjusted at +1/12 inch. The tires an shock-adsorbers are new.

If I set the tire pressure in the front to comfortable 26 PSI, the car lurches unpleasantly up to about 35 ml/h, in more speed it rises well straight ahead. If I increase the tire pressure to hard 36 PSI, the straight-ahead is much better.

Does anyone have a hint?

[BRENT in 10-uh-C]

Several intents may be lost in the language translation, so please forgive me, but the +1/12 inch would indicate to me that the front wheel alignment is toe-ed-out. If this is the case, with the lower tire pressures, the tires are gripping more which the extra traction is likely causing the darting or wandering. Try resetting the toe-in to an number between 1/16th to 1/8th inch and see if that corrects your issue.

[duke36]

Yes, set to 3mm toe-in and 241kPa (kalt) for all tires

[Werner]

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Thank you both for the hints. Sorry, I probably said wrong.
The toe is 1/12 inch, about 2 mm tires front narrower. The air pressure is currently 38 PSI, 2.5 bar.