Brad!, tire report Options

[Trekkor]

On heavy big powered cars these may be a/x only tires.

On a 914 I'm hearing and experiencing nothing but good in dry conditions.

I have 14 hours of track time on this set. Still above the wear bars.

They are rated to run between 210-240 degrees, which I have come nowhere near.

If someone has had bad experiences with these on a 914, I will listen.

QUOTE

sidewalls flex like truck tires.

Not on a 205/50/15. No way. What are you talking about?

KT

[Aaron Cox]

watchu talkin bout matt?
(IMG:http://www.cnn.com/2000/SHOWBIZ/News/12/27/showbuzz/gary.coleman.jpg)

[Trekkor]

QUOTE

special brake duct

My calipers stay under 300 degrees, so I think congratulations are in order. (IMG:http://www.914world.com/bbs2/html/emoticons/cool.gif)


Like I said, if you have tracked a 914 with 710's, I'm listening.


KT

[MattR]

QUOTE (trekkor @ Apr 4 2006, 10:54 PM)

QUOTE (MattR) sidewalls flex like truck tires. Not on a 205/50/15. No way. What are you talking about? KT

The 710s have way more sidewall flex then an RA1, yok, or hoosier of the same size. Ask the guy who mounts your tires... I've done a few sets, and I can say for certain they are really weak sidewalls. Thats the only first hand experience I have with 710s. Everything else is from other people who have raced them.

Again, this is track only. For the street, 710s can be fine.

[Trekkor]

QUOTE

sidewall flex

Where?


KT

[Aaron Cox]

edited

(IMG:http://www.914world.com/bbs2/html/emoticons/pizza.gif)

[Twystd1]

(IMG:http://www.914world.com/bbs2/html/emoticons/popcorn[1].gif)

[MattR]

QUOTE (trekkor @ Apr 4 2006, 11:06 PM)

QUOTE sidewall flex Where? KT

(IMG:http://www.914world.com/bbs2/html/emoticons/huh.gif)

sidewall flex isnt really a visual thing...

This is my last post on this thread. I suggest RA1s. If you think I'm wrong, cool... more RA1s for me.

[Trekkor]

rh, lh. What's the difference?

That's a fast exit at Laguna, down hill.

Here's a hard right hand at an a/x at about 45-50 mph.
Right inside front lifting.

KT

[Twystd1]

Crap... And I was just starting to enjoy the thread......



Twystd1

[Trekkor]

Turn 11 at Sears.

I like the tires, OK?


KT

[redshift]

I agree with Matt, if not just to get another cool picture of your car.

(IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif)

Looks great! Looks like it's driving fine too! DO you have any bad driving pictures?


M

[Andyrew]

Bout the only thing I can tell you is that 225's are fine once you start rolling just a tad.

In parking while the vehicle is stopped, you might find it slightly difficult to move the wheel.

That being said, I'll be running 255's up front, and im not worried.

Andrew

[drew365]

QUOTE (trekkor @ Apr 4 2006, 11:01 PM)

Thanks. My front bar is currently set at 2/3rd's toward full firm. I do have a lot of room to back off. Will I need to mod the front to accept the bigger skins? KT

Everthing Dan has told you is right on. But the fact that your front bar is set at 2/3 firm says your leaning toward oversteer now. If you up the size of your front tires you may run out of front sway bar. I changing my front torsion bars from 22mm to 23mm because I have the same scenario as you: after moving up to 225's on front my bar is 3/4 firm and I'm still fighting oversteer so I'm moving up the torsion bars to get a more neutral position on the sway bar.

[jhadler]

Trekkor,

You can fit 225's up front if you have the right wheel without rolling the fender. I can fit 'em in there on an 8" rim with 5" backspace. Rears are pulled out, but the front fenders are stock.

Matt,

Are you sure you're talkin' about the 710's and not the Ecsta 700's or the Ecsta MX's? Now -those- (the MX) have super soft 'n squishy sidewalls. I've not driven the new Kumho 710's but I'd be surprised if they are as bad as you describe.

-Josh2

[Trekkor]

My wheels are 7" wide with 5" backspace.
I like the balance of the car now very much. More grip would be nice.


I don't want to buy a pair of the 048's just to find out that the 710's I have in 205 size are grippier. (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif)


KT

[grantsfo]

I have been very surprised at how little my 914 plows with 225 in front and 265 in rear. Granted I have been driving mountain roads, hardly comparison to AX or track. It maybe because of the soft bar I'm running up front. Maybe its the 1 inch spacers I'm using to widen the front track? I know I'm wide in the front because my tires rub slightly on my flares in slow turns.

I too like Dan had a Boxster and ran 225 in front and 255 in the rear. Understeer was more of a component of my driving style with that car. If I drove poorly the car would plow, If I did everything right it had great turn in and I could invoke oversteer. Just increase entry speed a little and lift slightly as you approach the apex then back on power. Car rotated fine for me. Did the same with the 914 when it wasnt turning. Guess driving FWD cars in AX has helped me.

I guess its always better to have a little oversteer, but its not the end of the world to have a car that mildly understeers.

No one talks much about the advantage of being able to ge on full power more quickly when the car does turn with larger rear tires.

[Dave-O]

I guess sidewall flex must be good for AX (IMG:http://www.914world.com/bbs2/html/emoticons/wacko.gif) . More national championships were won on 710's last year than any other R-compound (including hoosier).

The only problem I would see with them on the track vs. an AX is heat from being worked on the track for a lot more than 1 min at a time. It could be a lot more of a problem on a heavier car but Trek seems to be doing well with them on a 914.

QUOTE

sidewall flex

[Trekkor]

So, If I were to try 225's in the rear and the car started to understeer ( push ). I would add rear spring or loosen front bar. Is that right?

I'd like to have a second set of 7" rims, mount the Yoks 205/225 and compare the handling/times at the track on the same day.


KT

[DanT]

QUOTE (trekkor @ Apr 5 2006, 02:46 PM)

So, If I were to try 225's in the rear and the car started to understeer ( push ). I would add rear spring or loosen front bar. Is that right? I'd like to have a second set of 7" rims, mount the Yoks 205/225 and compare the handling/times at the track on the same day. KT

Yes (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif)

I find this discussion about 710s to be very interesting.

I know of at least of couple of folks that have them on 914-4s on the track and have had no issues...they all rave about the grip and the good wear.
I wonder why?

Maybe as Trekkor is saying, we are talking about 914s that are extremely light when compared even to a Miata.

Not saying anyone is wrong on this topic. Maybe we are talking apples and oranges? (IMG:http://www.914world.com/bbs2/html/emoticons/dry.gif)_
It might get to be a different story at TH or BW in July with ambient temps in the 110s+.
I guess the answer is if they don't work some folks will speak up with direct knowledge and then none of us will consider them for track tires again. (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif)