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I had my alignment done today to DSC Street/occasional track specs. I gave the tech the DSC sheet. The number on the sheet he gave me doesn't exactly match. He said he adjusted exactly to the spec, but because the tires are so wide and different size, the machine read out is a little off. Also, he uses degree instead of mm for toe. Can you look into the number and tell me whether it is within the specs?
It looks good and is very, very close to the DSC spec. However, perhaps the most important measurement is missing, and that is rear caster. Alignment racks can't measure that, it's not adjustable in most vehicles, and it requires a special GM tool. If they had that tool and knew how to use it, they should have written it on your alignment report.
It looks good and is very, very close to the DSC spec. However, perhaps the most important measurement is missing, and that is rear caster. Alignment racks can't measure that, it's not adjustable in most vehicles, and it requires a special GM tool. If they had that tool and knew how to use it, they should have written it on your alignment report.
Thanks Foosh. The tech assured me that he adjusted the rear caster to the spec. He said it doesn't show in the printout..
I am, however confused. I used this calculator to convert from inches to mm, the the result should be -.043° for front toe and not -.12°. I used 25.8" as tire diameters.
first, you sure the total toe is in mm? If yes then what you do is -0.0393/25.4 = -0.001547244 inch.
Put this value into the website calculator and you get:
Toe for one wheel in degrees = -0.001718 Total Toe in degrees = -0.00344
very small, effectively 0 deg toe.
DSC recommends -0.5 mm toe per wheel. Total toe per front axle is -1.0 mm. Divided by 25.4 = -0.0393". That is the total toe I plugged in the calculator.
OK , then your original math is correct then. If the website app is correct then it says you front wheels are slightly toed outward. I don't think this is desirable for either street or track use but I'll leave that up to the suspension jockeys on the forum to assess.
I had mine done on DSC's rack, and Mike said at the time -.5mm accuracy is impossible to measure on most racks, but they are able to get that precise with his trick rack. You really want to be near zero toe on the front, which is about what .-5 mm gives you. I mistakenly looked at your before measurements, which were better than what you ended up with.
Best I can figure you have 5mm total toe in the front instead of 1mm total toe. That's definitely a bit on the high side. The good news is that the tech should be able to put it on the rack and just adjust the toe without having to readjust anything else like camber or caster.
Best I can figure you have 5mm total toe in the front instead of 1mm total toe. That's definitely a bit on the high side. The good news is that the tech should be able to put it on the rack and just adjust the toe without having to readjust anything else like camber or caster.
Thanks.
I am going back to the dealer on Friday. Did you mean -1.0mm total toe? Just making sure what to ask for.
I'm inclined to try for -0.5° camber and zero or very little toe for front, as I'm seeing more wear on the inside. Rear is wearing as expected and if in spec I'll probably leave it alone. Anyone see any downsides with the above combo for front? Is there a downside to zero toe for street use?
Help with my alignment specs
