: What to do to imporve traction!!



translux
09-07-10, 09:19 PM
I have an 10' V manual with about 3,500 miles and no matter what I do with tire pressure this thing is very,very loose. I first tried running at the recommended factory pressure of 32 psi at the beginning of the summer and had reasonably good traction, I went up to 35 PSI as the car felt numb and vague at 32. At the 35 traction improved :hmm: but as its started getting a little cooler its gotten worse, much worse I dropped to 32 yesterday and on the drive home tonight with ambient temp of 72 the car was all over the place.
i drive hard but the tires still have plenty of treed, and while I realize 550 ft/lbs makes matters worse/better I'd like to think that there is a solution.
I'm open for anything including wider rims and tires if someone can definitively say traction was improved considerably while improving handling.
I want to start the mod path but with this level of traction it would all be for naught.
Any recommendations would be greatly appreciated.

snzuloz
09-07-10, 10:49 PM
Are you looking at traction in general or straight line improvements mainly? Getting a stickier tire that performs better than the stock setup might be difficult as the handling might get worse than the ps2s offer. The school of thought is always wider is better (more contact patch) but at a certain point the weight distribution is also diminished across the tire. Look at the drag strip cars that run the 10 inch class making ridiculous hp that hook with that small of a tire. I question whether increasing the rim width and tire size marginally actually affects the hookability of the tire much vs what it already offers for the money involved.

Several others are using setups already, hopefully some will give some responses as to how there tires are in relation to your questions, I think my end result will be the Bridgestone re-11s.

baabootoo
09-08-10, 12:23 AM
For the 2009s, the "normal pressure" is 34, and up from there. Have you tried the track pressure of 40? I'm not sure what you mean either. At 40, these things stick pretty well on a road course; for hauling 4500# that is!

alaskar
09-08-10, 01:57 AM
Hey translux.

I'd strongly and definitively recommend the Bridgestone RE-11s in 305 trim. We have these on an 800whp 997 Turbo and they're spectacular.

Granted it's a four wheel drive car, but most of the time that car responds like a rear wheel drive maniac! Also throw in the D3 springs for good measure.

Here is a link to razorecko's post with pictures of his setup. According to him the car has much more bite and as you'll see from his pictures, the car is bad-ass.

Hope this helps!

http://www.cadillacforums.com/forums/cadillac-cts-v-series-forum-2009/205716-305-265s-d3-springs-w-oem.html
http://img257.imageshack.us/img257/8226/img0876iv.jpg
http://img34.imageshack.us/img34/3416/img0877zo.jpg
http://img840.imageshack.us/img840/9680/img0881.jpg

Domsz06
09-08-10, 08:07 AM
don't use the right pedal so much :) j/k

Like others have said, wider tire and softer compound will help you a lot.

translux
09-08-10, 10:07 AM
Thanks guys, yes razorecko car looks amazing!
I'll try some additional PSI today and see what happens.
I wonder why they lowered the recommended PSI on the '10, maybe to improve ride comfort?
http://i891.photobucket.com/albums/ac120/trans_lux/IMAG0081.jpg

gnxs
09-08-10, 10:21 AM
Keep in mind that the 305's are also .6" shorter which will give you more effective gearing and less sidewall to work with (both of which will negatively impact traction). Whether the width and compound of the RE-11's make up for that is the question. Like Razorecko, I have the 265/305 RE-11 front/rear setup on my car. I find the handling is noticeably better, but the straight line traction is only marginally improved on the street. I'll be at the drag strip in about 10 days and I'll see whether my short times improve with these tires.

Domsz06
09-08-10, 11:14 AM
Thanks guys, yes razorecko car looks amazing!
I'll try some additional PSI today and see what happens.
I wonder why they lowered the recommended PSI on the '10, maybe to improve ride comfort?
http://i891.photobucket.com/albums/ac120/trans_lux/IMAG0081.jpg


My 09 has the same ratings.

Domsz06
09-08-10, 11:15 AM
Thanks guys, yes razorecko car looks amazing!
I'll try some additional PSI today and see what happens.
I wonder why they lowered the recommended PSI on the '10, maybe to improve ride comfort?
http://i891.photobucket.com/albums/ac120/trans_lux/IMAG0081.jpg


My 09 has the same ratings.

SleepTight
09-08-10, 12:16 PM
As does mine. I actually prefer a slightly firmer ride and accordingly run 34 PSI in the front and 36 PSI in the rear. BTW do not, under any circumstances, trust the in-car PSI display. Use a good gauge and you will find the sensor is usually off by at least 2 PSI.

cbloveday
09-08-10, 12:55 PM
As does mine. I actually prefer a slightly firmer ride and accordingly run 34 PSI in the front and 36 PSI in the rear. BTW do not, under any circumstances, trust the in-car PSI display. Use a good gauge and you will find the sensor is usually off by at least 2 PSI.

X2. I have noticed this as well.

baabootoo
09-08-10, 01:41 PM
For the 2009s, the "normal pressure" is 34, and up from there. Have you tried the track pressure of 40? I'm not sure what you mean either. At 40, these things stick pretty well on a road course; for hauling 4500# that is!

Yep, I stand corrected. I read a post vs. looking at the sticker! :)

translux
09-08-10, 09:13 PM
I tried 37 cold, got to 40 quick, car felt like it was riding on 22" and was awfull, dropped back down to 35 cold car rides better but traction is still a challenge.
And I have the solution for straight line traction-leave the traction control/stabiltrac and the suspension in the default start up mode-really this for me provides the best launch:thumbsup:

M-1028
09-08-10, 10:19 PM
As the roads start to cool off, there is really nothing to do other than feather the throttle. It's a double negative with these cars because boosted engines LOVE cool air, and traction HATES cold roads.

SwedishChef
09-09-10, 06:34 PM
I know it's obvious, but I'll say it anyway, since it bit me - rear wheel alignment.

Not long after an alignment, something happened - I have no idea what - that threw it out of whack again only a few days later. (Apparently the camber adjustment is, in particular, easily thrown out.) When the alignment was off the car would break loose easily with little provocation. Alignment didn't immediately occur to me, as I'd just had it done.

Just my 2 cents - might have it checked.