Thanks for the further input on the Baer weights. It looks like both of you found the rear Baers to be heavier than I found with the Giro's and the fronts to be lighter.

I have a set of front Baer's coming, I will weigh them and post the weights here when I get them. If they are lighter I will put them on. Be real nice to see them at 15.8 pounds!!

Planning another round of testing to verify something else tomorrow. This is going to be one that is copied if it works out A lot of stuff planned this week at the shop, just have to get to it all. My poor RS, it has to have a 1,000 dyno runs on it at this point.

I believe the BBS wheels I have are far from perfect, sorry.

MR600, I like your signature, a man that knows weight is important!

 

David, elaborate on this quote, or PM me if you'd prefer!

 

Dave, have u guys checked into getting some Brembo Sport rotors or the Tarox G88 rotors that come with their 10 piston front & rear kits??? Any Project MU rotor testing coming up? i do need a set of rotors for the '03 so this thread is great. Good work chap!!

 

it's great to be picky but at some point you have to collide with reason. take note that you never get something for nothing. while you're accelerating faster your steady state speeds are harder to maintain and cost more energy as you DON'T have the additional mass to keep the wheels spinning easier.

while that's not a big benefit and it's absolutely wonderful to have a lighter footed car it's also nice to have a fat footed car. the 275s will well make up any shortcomings in its weight.

few choices here, volk te or ce, gramlight 57f, ssr forged, racing hart cp035 (custom only), enkei rpf1 (this is actually cast)

 

Great test,man!!Dave,good luck on your RS.

 

housedj,

The Brembo sports I believe are all steel, so they are not going to be light. The Project Mu's are 18 pounds, I already posted that, no need to test them, too heavy. Never heard of Tarox G88's but I am guessing if it uses a 10 piston caliper the rotor is larger than stock and is going to also be heavier. The point of this testing was to see what a lighter rotor combo would do to the HP, maybe you missed that


warrtalon, you'll have to wait like everyone else

 

IIRC, when I switched from the OEM Yokohamas to the OEM sized Continental ContactSport 2s that I am current ly running I saved 9 lbs. per tire. This is something you can feel. When you combine this with my Girodiscs rotors and SSR comps the loss of unsprung weight is very noticable. I'm sure the dyno results would agree with Dave's findings. We are talking 17 to 18 lbs per corner! You could blindfold essentially anyone and have them ride in an Evo with and without this combination and all would notice the ride difference within a quarter mile.

 

#1, i know i have been critical to buschur's involvement in these boards, but this is an awsome test and props to david for taking the time to do it. Second, if david does not mine me asking, what mods is he running when he did this dyno, and with what kinda of gas. Becasue if i read right, the numbers he posted up with his MD would be equilevent to a 450-500whp car on a dynojet so i'm assuming that the stock turbo is no longer in there

 

silvrghost,

Tell me more about those type tires. Any good? Must be lighter because they have less reinforcement in the sidewalls and probably don't handle as well as the Yok's, no?

ballistic speed,

The car has every single part we make on it with our 20g-9-5 turbocharger. Running C16 and the car made 460 whp and 532 ft lbs on a Dynojet.

 

Dave,

I got the tires from Tire Rack because their testing had the tires doing very well against the max performance tires at the time (14 months ago). These are not R compound tires. I believe they are excellent street tires. They are much quieter than the Yoks and ride much better. I mean it is a day and night difference. They ride better because they are much lighter and they are much more compliant. They seem to wear extremely well. I believe they were designed to tolerate negative camber. They don't have anywhere near the road noise of the 048s. For the street I still feel this was a good tradeoff.

However, you will definitely notice a loss in the instantaneous steering response that you get with the Yoks. So, I would say a lot of the weight loss is in the super stiff sidewall of the hyper performing tires like the 048s or Neovas. Also, IIRC I think the Yoks have a steel belt which really reduces contact patch distortion but is also heavy and located at the circumference of the tire. This location is just where you don't want weight if you are trying to reduce rotational inertia.

The Contact Sport 2s held up to a couple of track days extremely well. However, they could not touch the R compound Yoks that I use as track tires today. Rotational inertia doesn't mean much if I can beat you out of a turn with a 10 MPH superior turn exit speed. At the end of the stright you may reduce my advantage by 2 MPH with lighter tires but I was still pulling away from you for the whole straight.

Again, the Sport2 are max performance street tires that are pretty good in the rain and will suck in the snow. No good street tire with good ride, good durability, and low noise will ever compare favorably to a Neova in track performance. This is why they are not my track tires. But I think they are great on the street.

 

LOL Those Contact Sport 2s look like they belong on my Ford Taurus!

And unless I'm looking at the wrong tire, they dont appear to be that light. Toyo Proxe T1S tires weigh in at 23lbs as well...


235/45 WR17
97W XL 280 AA A
1609 lbs.
51 psi

23 lbs. 0-0"

 

were the project mu rotors the 1 piece or 2 piece with aluminum hats?

 

I like the info but I will let you know the part of the math is incorrect. Think of it this way:

You will get to a certain speed .06 seconds faster but you wont finish the line .06 seconds faster... you will be going faster but you wont finish .06 seconds quicker.

I didnt ever think of it until I logged my car on pump gas then race gas and came up with 60-120 mph difference on some insanity like 3.5 seconds. Needless to say I wasn't 3.5 seconds quicker on race gas

 

David, thanks for taking the time to do these tests and make them public. this is a very informative post and it's always a pleasure to have such vendors on this forum.

 

LOL, no **** Sherlock. If you logged a 4th gear pull from 60-120mph of course it wouldn't correlate to 3.5 seconds at the strip. Unless you always make it a habit to shift into 4th at 60mph when drag racing.

David's point was that his car goes from 5000rpm to 7000rpm 4 times in every drag run, so .06 seconds x 4 gears = .24 seconds. Obviously the timing would be shorter in the lower gears, but I think .12 seconds is a completely reasonable guesstimate. You know we'll find out sooner or later :-D

I know my car felt noticeably peppier when I installed my Girodisc brakes, and yes it stops MUCH shorter too, but the Ferodo DS2500 pads are much more aggressive than the stock ones, so I can't say how much of the braking perfomance is due to that.