Evo IX Video Roebling Road

[cgmeredithjr]

Took the Evo to Roebling this weekend.

http://videos.streetfire.net/video/1...230090aa17.htm

Cleve

[racerjon1]

Nice lap time, especially with the push and other issues you are fighting there.

What kind of front-strait trap are you seeing?

[Balrok]

Nice, i'll be up there in mid Feb for the first time on nt01's, should be tons of fun

[racerjon1]

Which group are you going with in February?

I will be there Friday, and then SeatTime is on Feb 22.

[cgmeredithjr]

Originally Posted by racerjon1

Nice lap time, especially with the push and other issues you are fighting there.

What kind of front-strait trap are you seeing?

According to my gear ratio calculations around 155MPH on the front straight. 7195 RPM in 5th running BFG 255/40-17, stock gear box and final drive. At first, the AEM data log was telling me 173 ...then I went and did a manual calculation which corresponds with the factory speedo.

Cleve

[racerjon1]

Originally Posted by cgmeredithjr

According to my gear ratio calculations around 155MPH on the front straight. 7195 RPM in 5th running BFG 255/40-17, stock gear box and final drive.
Cleve

That's only slightly slower than my 1:21 lap there with the AMS car, that trap was 155 -157, but I had on the Street tires, so substantially less grip.

[Balrok]

Originally Posted by cgmeredithjr

According to my gear ratio calculations around 155MPH on the front straight. 7195 RPM in 5th running BFG 255/40-17, stock gear box and final drive. At first, the AEM data log was telling me 173 ...then I went and did a manual calculation which corresponds with the factory speedo.

Cleve

Nice...I heard that front was pretty long. I'm going with the Citrus region PCA on the 16/17th. Not my first choice but my father mentioned he wanted to go with PCA there, so I joined in

[bluestreak]

I really dislike roebling! Maybe I just suck at it.

[racerjon1]

Originally Posted by Balrok

Nice...I heard that front was pretty long. I'm going with the Citrus region PCA on the 16/17th. Not my first choice but my father mentioned he wanted to go with PCA there, so I joined in

The front straight is long for sure, but as with any straight, entry speed is the key, and the corner that leads onto it is a long sweeping downhill right.

In a stock Evo that corner (8 or 9 depending how you count) is flat, and you can exit doing 90-95mph, the front straight is then 135-136.

In the AMS Time Attack car in One Lap trim - 295 width Kumho MXs, I was entering the straight at 105.

For comparison, some other front-straight trap speeds I have done: (all stock, other than the racecars)

Corvette Z06: 145
Dodge Viper GTS: 146
Porsche 911 GT3 RS: 152 (and I was going way slower than I needed in 8/9 as the sun was in my eyes..)
SCCA Formula Continental: 132
SCCA Showroom Stock Neon: 112
Lotus Exige: 131

I have seen a stock C6 Z06 trap 160... which really, is not even sane for a car to be able to do off the showroom floor.

[racerjon1]

Originally Posted by bluestreak

I really dislike roebling! Maybe I just suck at it.

I tell people that Roebling is "easy to learn, hard to master"

The long corners put a strain on both car and driver.. if your car doesn't have grip, it's not going to like it. If it has a balance problem it's not going to like it.

As a driver, you have to be very smooth and very disciplined to get it right, all of the entries are pretty much fast entries, which means the weight transfer you do get can get away from you in a hurry - thing about the difference in a 30mph lane change at an autocross and a 60mph lane change.. same thing.

In a stock Evo the corner entry speeds are 90, 75, 100, 65, 75, 80 and 90. Compare that to some place like CMP, where four of 14 corners might over 65mph, and only two are above 80. Even VIR only has six corners - out of 17 that are that fast, if you count all of the uphill esses.

Then you have the long part of the corner.. steady-state cornering is what's rewarded, any scrubbing of speed or sliding is multiplied.. it would be like lifting on a straight.

because of the push of the Evo it isn't a good car there, though there are some tricks I find you can do to make it work a little better. Other than that you just have to be very very smooth.

[bluestreak]

I just dont like it being all sweepers, and it eats left side tires, I was simply bored driving there. It's very technical in a roundabout way ( which is what I dont like) and I'm sure there are techniques that if you master them there will help you at many other places, but I dont know if I have the patience. Even if I took the time to learn to go fast there (only been once), I still think I'd be bored.

To each his own I guess.

[Jeff_Jeske]

Other than the straight do you think the 35R makes you faster on that track?

[racerjon1]

Originally Posted by Jeff_Jeske

Other than the straight do you think the 35R makes you faster on that track?

It will make you faster, but not the same % faster that it might somewhere else.

I mean, it will help a little.. the run from 2-3, 4-5, and then up the hill out of 7.. but it isn't going to help out as much as it would at a more eh.. "traditional" track with more than four straights, or a track with a few slower corners where digging off of them helps a lot.

Take some data..

One Lap 2006, AMS Evo, 500whp would exit 8/9 at 105mph, and hit 157, Luke Russell's STI at 425whp or so was exiting at 110, and hitting 151, the lap time Difference? 2 seconds. (1:19.8 vs 1:21.9) That 5mph per corner over more than a mile of corners makes up a ton of difference.

Roebling is like a huge skidpad in that way, for probably 45% of the track, it doesn't matter how much Horsepower you have, but how much grip you can generate.

[cgmeredithjr]

Originally Posted by Jeff_Jeske

Other than the straight do you think the 35R makes you faster on that track?

Good question, it definitely helps on the straights and pulling out of the corners, but entry speed and mid corner speed are probably the same as a lower HP set up. Unfortunately, I did not bring the car to this track when it was stock or with previous smaller turbo set ups to be able to compare times. I do know that the FP HTA35R is extremely fun and lag is a non-issue on a road course where you are only using 3rd, 4th, and 5th and are always above 4000 RPM. If I keep the car, it will be insanely entertaining with a built motor and the ability to rev to 9K.

Cleve

[Jeff_Jeske]

Thats good info... I would have thought the exits would be laggy.