Rubbing Issue

[69XSN]

Hello and good day. I need a little help with setting my suspension. I am aware that they are many variables to consider, track, tire size, driving style etc. Presently I'm using continentals 215/40/17 on the front and the car is lowered by two centimeters via tein mono flex coilovers. My problem is that I'm having serious rubbing at the rear of the front wheel wells at the track, under hard braking and/or cornering. I could be mistaken but I believe that the rubbing was a contributing factor to having the front wheels lock up creating a understeer situation which resulted in a minor fender bender. Also I don't know what the hell I'm doing at the nurburgring, only that's fun until I have to buy new parts. For those familiar with the tein mono flex I'm using the original or factory setting. Since I'm not very knowledgeable on suspensions any input would be greatly appreciated to include driving tipps. Thanks.
Anthony

 

[69XSN]

30 views and no suggestions! I suppose I'm asking in an improper manner or only a few use the tein mono flex at the track.

 

[asylum]

This has nothing to do with the Tein and the lowering. With 215/40 R 17 front tires, you can lower your car a lot without rubbing issue with the right rims.

What is your front wheels width and ET ?

 

[02#154]

asylum nailed it. The rubbing you're experiencing is related to the wheel width and offset, not the suspension. Post your front wheel width and offset and I'm sure someone will be able to tell you more.

J

 

[69XSN]

The front rims are 17x8.0. I'm not sure what the ET is, but the rims are Advan RZ's from SOS. I was thinking that raising the front and lowering the rear a bit (about a centimeter) might solve the problem but it seems I might be incorrect. Thanks for the input guys, hope I don't have to get smaller rims.:frown:

 

[W]

It sounds like the rubbing may be due to the compliance beam moving. This seems to be a common issue with people running 235/40/17 at the track.

 

[Hrant]

It sounds like the rubbing may be due to the compliance beam moving. This seems to be a common issue with people running 235/40/17 at the track.

Hoosier 225/40/17 see page 20 https://www.hoosiertire.com/speccat.pdf

8.9" wide; 23.8" diameter; 74.5" circumferance; 7-9" recommended rim; 7.5" measured rim; 9.8" section width. Tire weighs 20 lbs and has 4/32 depth

Toyo RA1 235/40/17 from: http://www.hmsmotorsport.com/docs/Toyo_RA1_Size_Chart.pdf

Rim range 8-9.5" and tested on 8.5" rim; 9.6" wide; and overall diameter 24.4" (tread depth 8" if you shave it will be 6"). Tire weighs 24 lbs.

The tire is shorter by 0.6" if the RA1 is not shaved, hence why it does not rub. But it is also a bit narrower which is not bad when it comes to balanced handling with 275 rear.

 

[W]

Hoosier 225/40/17 see page 20 https://www.hoosiertire.com/speccat.pdf

8.9" wide; 23.8" diameter; 74.5" circumferance; 7-9" recommended rim; 7.5" measured rim; 9.8" section width. Tire weighs 20 lbs and has 4/32 depth

Toyo RA1 235/40/17 from: http://www.hmsmotorsport.com/docs/Toyo_RA1_Size_Chart.pdf

Rim range 8-9.5" and tested on 8.5" rim; 9.6" wide; and overall diameter 24.4" (tread depth 8" if you shave it will be 6"). Tire weighs 24 lbs.

The tire is shorter by 0.6" if the RA1 is not shaved, hence why it does not rub. But it is also a bit narrower which is not bad when it comes to balanced handling with 275 rear.

Thanks for the info. I wasn't sure how they compared because of measuring rim width differences and type of measurement. I did some tests tonight and have decided to go with a shorter tire like the Hoosier 225 with more offset.

 

[69XSN]

From the responses so far it seems that the problem is with my tires. My car is used mainly for street motoring so I have no intention to purchase another set of tires (wish the stock rims would fit over the racing brake discs). So I'm left thinking that the way to solve my problem is to use 5 or 10mm spacers at the track. Any suggestions on using those spacers at the track would be greatly appreciated and thanks very much for the input guys. Thanks.
Anthony

 

[2slow2speed]

Please provide complete information.

In the original post you indicated that you were running 215/40/17 tires up front on a 17x8 rim, if that is the case then the problem is probably NOT caused by your tires. If you are running 235/40/17's then tires are more than likely the cause of your rubbing problems.

Please provide the offset for the front wheel, you might need to take the front wheel off and look for a label that might have that information available. (I've never had Advan's so I don't know if they have that information). Or you can send an email to Chris at SOS to find out which wheels he sent out, the high pad version for BBK's or the regular version.

Someone else pointed out the possibility of the front suspension changing under braking, that is a possibility as well.

SOS sells the following part that might help you: http://www.scienceofspeed.com/produ...mance_products/NSX/Cedar_Ridge/pivot_clamps/

Take a picture of the inside liner of the front fender with the front wheel removed and post it so that we can find out where the rubbing is happening.

Information such as your front alignment spec would be useful as well.

BTW: it seems that there were some tangent topics that might have confused you.

In regards to spacers, I've run 5 and 7.5mm spacers on my track NSX with no major problems, remember to change the studs if you plan to run spacers. Higer widths require wheel adapters. Don't jump into the wheel adapters without having an idea where the rubbing is happening and why.