Kumho vs R888

[Dman]

Which wins the traction war, in straight line, in open track?

I'm assuming the R888's beat the corsa-r hands down, I ran the corsa-r and it was a great street tire, improvement over MPSS's, but not impressed on track outings or straight line grip.

For those who know, if you're replacing your kumho's, is it another set, or mover to R888's ?

Thx.

[serpent]

Open track will probably be the kumho since it was designed for the ACR. Although I dont know how it would be for a street tire, that 25 side wall (aspect ratio) is thin as hell!

[ViperPete]

My car has 600whp. Not high by any means compared to some of the fast cars on here.... but...

I can say that i just ran my car 16 times at the 1/2 mile event and only experienced a little bit of 1st gear WOT rear end wiggle. The grip is absolutely remarkable.
Overwhelms the stock Pirellis in straight line performance.
I feel the opposite for cornering. The Pirellis feel less twitchy than the R888's. I feel more confidant corning at 80-110mph with the stock tires than the R888's

My clutch was smelling after around 12th run onward so I know that they are hard on the drive-train.

[Bruce H.]

The Toyo R888 is ancient as tires go, but the new R888R might be worth a look. At this time it only comes in the 295/30/18 you'll need for the front of a non-ACR, and maybe paired with the original R888 or others for the 19" rear if you like.

I haven't seen a particularly positive review of the R888 on a Gen V over the last 3 years, so suspect it may not be an upgrade to the Corsa.

[Bill Pemberton]

Kumho would run circles around an R888 , as Bruce H mentioned the R888 is an ancient design ( new R888R does not have sizes for Snakes ). But I will state that it is much better than in the past as the compound has changed numerous times. Alas no real comparison as there is not an R888 to fit on a new ACR, or a Kumho ( ACR style and compound) to fit on a different rim for a regular Viper.

The original R888 was so disliked that they dropped it as the Series Tire for the World Challenge Series after one year. The same thing occurred when it was the Series Tire for Pro Spec Miata ---- not a loved tire. But over the years there have been changes and it seems to work okay for many who drive to the track and only for 15-20 minute sessions.

No matter how we all look at this , there are not a lot of choices , so all need to be reviewed and checked out.

[Ripper]

Never driven a Viper with a set of R888's so I cannot comment on that..but I can say they work awesome on my TT Lambo :-)

Nitto Invos have been a really good choice for my Gen III

[outnumbered]

Never driven a Viper with a set of R888's so I cannot comment on that..but I can say they work awesome on my TT Lambo :-)

Nitto Invos have been a really good choice for my Gen III

Like this?

http://www.ebay.com/itm/2-NEW-345-30-19-NITTO-NT05R-DRAG-RADIAL-BLK-30R-R19-TIRES-/360886679266

[Ripper]

Like this?

http://www.ebay.com/itm/2-NEW-345-30-19-NITTO-NT05R-DRAG-RADIAL-BLK-30R-R19-TIRES-/360886679266


I wish I had asked HRE to build another set of rear wheels in a 19 back when I had them built as I would run the tire you listed.



I have 20's in the rear and these are the tires I run. They actually hook decent in warm weather.

http://www.ebay.com/itm/2-New-345-25ZR20-Nitto-Invo-Tires-100Y-/272091067038?hash=item3f59e4329e:g:Qn8AAOSwZ1lWhFp E&vxp=mtr

[Dave1968]

They better hook for that price!

[Ripper]

They better hook for that price!



No kidding..

I have to get something for my "street" set of wheels.

When the need arises for "real" traction, I break out the MT Drag Radials on my CCW 18inch setup.

[aNinjaneer]

On a track with turns, the Kumho will likely win. In a straight line in a car with any considerable amount of power, the R888 takes the win. We run the R888s on our stock motor turbo cars, and they have no problem holding the 1100+whp with boost by gear. The stock Kumhos are easy to spin, even at stock power levels.

[Jack B]

On a track with turns, the Kumho will likely win. In a straight line in a car with any considerable amount of power, the R888 takes the win. We run the R888s on our stock motor turbo cars, and they have no problem holding the 1100+whp with boost by gear. The stock Kumhos are easy to spin, even at stock power levels.

No dis, but, this story get old. You cannot make that comment about a car that does not have aftermarket traction control.

[Dman]

I'm looking at a H/C car level of power, so like 650-680rwhp. My target is to straight line in the 10.4-10.7 range without voodoo magic.

I also want to auto-x and do fun track days as I like, without running a separate setup just to have fun or be reasonably competitive.

I'd think the 19/19 setup with Kumho's would be a great setup for obvious reasons, for auto-x and track days and fine for street driving. Not sure how they are in straight line hunt for 10's though.

I've heard plenty of good feedback on R888's for straight line power in the range I'm talking about, without having to go to a special rear setup/DR's/slicks, while being a solid street tire and good for turning fun.

I guess worst case, I could run SW2 18/19 setup with R888 or corsa-r (was hoping for something better than these though) for everyday, and a set of auto-x/track event tires on extra SW2's, then I could even do a set of DR's on 18 or 19" SW2's in the rear for straight line and 1/2 mile stuff.

I was just trying to reduce the sets of wheels & tires. I have 3 sets for my GT500 now, plus 4 sets for the race car, so another 2-3 sets for the viper ... I need a garage just for wheels & tires, lol.

[Stealth78]

Kind of a bummer to hear so many people hating on the R888's... This is what I plan to go to. Is cornering really that bad with them?

[aNinjaneer]

No dis, but, this story get old. You cannot make that comment about a car that does not have aftermarket traction control.

The story is the same with traction control turned off. I've now driven numerous stock ACRs, and every other model Gen V, and the Kumhos honestly have pretty poor traction on the street. On a track, I'm sure they're bad ass, but the lack of tread seems to make them slick on dirty roads. The R888s, on the other hand, seem to work better on the cars we've built than the 18" MT ET Streets. This is all personal experience, not guesses from the bench.

[Nine Ball]

I just switched from the TA Corsas to the R888 tires last week. The R888 certainly have more traction in a straight line than the stock Viper tires do. I've not had them on the road course yet, so I can't compare that. But, lets not kid ourselves - neither the Kuhmo or the R888 is a drag radial. The sidewalls are much stiffer than a drag radial tire. I would bet the Kuhmo is faster around the road course, where the R888 is probably better for auto-x.

[outnumbered]

I've heard enough to pull the trigger on the Toyo's.

[Jack B]

I just switched from the TA Corsas to the R888 tires last week. The R888 certainly have more traction in a straight line than the stock Viper tires do. I've not had them on the road course yet, so I can't compare that. But, lets not kid ourselves - neither the Kuhmo or the R888 is a drag radial. The sidewalls are much stiffer than a drag radial tire. I would bet the Kuhmo is faster around the road course, where the R888 is probably better for auto-x.

That was my point, on a high hp car, without traction control, you are forced to a minimum of a DR.

[Bruce H.]

When looking to increase tire grip on the road or track I think you need to consider suspension, in particular the limitations of the non-ACR Bilstein damper valving, particularly in "Race" mode. That's where I see gains in traction rather than replacing the Corsa tires that deliver all of the characteristics you want on a street/track day tire. There are better track only tires naturally, but it comes as no surprise to me that some of the fastest production sports cars wear the Corsa, and in the case of the Viper, the front tires are designed differently than the rears to optimize performance.

[Lexusf]

I recently put new rims to fit the acr tires and they are great! The car handles great. Now I notice how bad the 4 piston brakes are! Help anyone here know a 6piston upgrade that won't kill the bank account? I do not want to spend for ceramic brakes.

[kickfive]

I have a 2016 ACR E and track it regularly at Chuckwalla Valley Raceway (will be at the track this weekend). In an attempt to lessen tire expendables, I purchased a set of Finspeed's and wrapped them with R888's (315-30-18/345-30-19) to run on the track. The drop off in grip was so significant the R888's are now my "street" tires. I purchased an additional set of ACR front wheels from JonB and now bring two sets of front ACR wheels wrapped with the Kumho's to the track. The Kumho's work so well that I don't mind the expense. It's a great way to go.

[Bill Pemberton]

LexusF --- before you go nuts on expenses , think about upgrading the pads and what rotors are you running ( regular, Stoptech two piece, or Brembo two piece )?

[kickfive]

+1...Excellent advice. I also track a GTR, and caliper comparison aside, when brake pads went Endless MX 72, brake fluid to Endless RF650 and rotors changed to Alcon's, braking improved significantly. No longer have I considered CCB's as an option.