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Old 03-17-2014, 02:54 PM   #1
Sharp-ZL1
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Looking for 200mph

Can a m6 reach 200mph with a gear ratio of 3.73:1?

I have reached 180mph before I backed off.

I am at 620 RWHP.

I just changed to 295. 315 tire setup MPSS. I was impressed with the smoother ride and less noise they made on the short drive home.

I did notice that the front tires do stick out a little past the front fenders.

I have lower the car one inch and have no rub issues.

I still have to install the peedders bushing in the subframe.
I also order a G92X. Cam from lg motor sports.

Comments?
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Old 03-17-2014, 03:01 PM   #2
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Sounds nice, were you able to notice what the rpms were at 18o mph? That will give you a clue to how much more the car has left in it for speed. So you now have 295's on the front and 395 on the rear. Is 395 a typo?. if not that sounds really extreme. The car I have seems to sit really nice straight from the factory, do you think it was worth it to lower your car?.
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Old 03-17-2014, 03:06 PM   #3
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Shouldn't be a problem if you get the new "Flowtie badge"

In all seriousness, I think you'll need more HP to achieve that goal, but

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Old 03-17-2014, 03:16 PM   #4
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You need another 100 rwhp.

The Lingenfelter ZL1 that broke 200 mph had 720 rwhp.
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Old 03-17-2014, 03:26 PM   #5
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if you are really serious I would swap out 5th gear.

there are two approaches to 200mph live with the sixth gear gear ratio and 700rwhp+ proabably more like 800hp if you wanted to do it in a 2 miles span.

or make 200mph attainable in 5th gear and maybe 650-675whp would get your there in 2-3 miles.


also factor where you are going to try to do it if memory serves it took a while for that lingenfelter car to do it even at 720hp.


both lingenfelter and hennessy cars have done it on video though it is possible for sure.
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Old 03-17-2014, 03:37 PM   #6
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You need another 100 rwhp.

The Lingenfelter ZL1 that broke 200 mph had 720 rwhp.
The Hennessey ZL1 broke 200 mph with their HPE700 package. That 700 is supposed to mean 700 crank hp. I believe that dyno-ed around 650 RWHP. It hit 203.9 mph.

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Old 03-18-2014, 01:18 PM   #7
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That was a typo. Corrected to 315. Should I run smaller width tires up front?

After the cam up date I should be around 670-700hp. At least I am hoping for that.

I didn't notice my rpm at 180 I was focused mainly on the road.

I love the German autobahn at 4 am. They are empty.
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Old 03-18-2014, 01:34 PM   #8
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Originally Posted by Sharp-ZL1 View Post
That was a typo. Corrected to 315. Should I run smaller width tires up front?

After the cam up date I should be around 670-700hp. At least I am hoping for that.

I didn't notice my rpm at 180 I was focused mainly on the road.

I love the German autobahn at 4 am. They are empty.

Wait... So you did this awesome feet and failed to capture it on video?!?! How dare you sir, LoL
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Old 03-18-2014, 01:44 PM   #9
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Old 03-18-2014, 02:56 PM   #10
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I got the go pro now and plan on data logging my next run.
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Old 03-18-2014, 03:12 PM   #11
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im pretty much in the same boat.
i'm also sitting at 620rwhp and had it up to about 290kmh/180mph! Theres ample of gear left but it starts to run out of steam! You need more power or a different gear ratio...

P.S. it might go a bit faster but i had to back off as it started to drizzle
P.P.S. whipers work at 170+mph lol

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Old 03-18-2014, 03:31 PM   #12
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you're sitting at roughly 5100 rpm if i remember correctly

swap in the automatic rear end and you'd be at 6250 in 5th @ 200mph
But probably not worth it, just get more power and call it a day!!! lol
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Old 03-18-2014, 03:36 PM   #13
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im pretty much in the same boat.
i'm also sitting at 620rwhp and had it up to about 290kmh/180mph! Theres ample of gear left but it starts to run out of steam! You need more power or a different gear ratio...

P.S. it might go a bit faster but i had to back off as it started to drizzle
P.P.S. whipers work at 170+mph lol

It "starts" to run out of steam? I bet it has a little more then that in it. 620 rwhp and you should be knocking at the door of the 200 club! Shelby does it with about 590-600 rwhp and it's not any more aerodynamic then the ZL1. ZR1 does it with about 550 rwhp but yes, it is aerodynamically superior.

In the video posted of the Hennessey HPE700 ZL1, that dyno-ed at about 650 rwhp and it hit 203.9 pretty damn quickly to!

Video was awesome! I hate to request things like this of people but if you ever happen to do something like that again, is it possible to mount the camera by the speedo or so the heads up display is visible or something?
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Old 03-18-2014, 03:37 PM   #14
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It always helps to have more power. I think it will do it with 650 whp if you have enough road. Hennessey took like 3+ miles, did it in the early morning with cool still air. I'm going to try to do it in just 1 mile in 3 days......
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Old 03-18-2014, 04:05 PM   #15
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Shelby does it with about 590-600 rwhp and it's not any more aerodynamic then the ZL1
Shelby has 3:31 rear gears vs. ZL1's 3:73's??? (actually not sure the rear gear in the ZL1)
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Old 03-18-2014, 04:07 PM   #16
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Shelby has 3:31 rear gears vs. ZL1's 3:73's??? (actually not sure the rear gear in the ZL1)
M6 has the 3.73
A6 has a 3.23 I believe
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Old 03-18-2014, 04:14 PM   #17
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M6 has the 3.73
A6 has a 3.23 I believe
that is correct!
Here's an interesting fact about the Shelby:
"The Shelby’s specs indicate that 200 was not an anomaly but a hunted target. For 2013, the standard rear-end ratio drops from 3.55 (3.73 with optional Performance pack) to 3.31, making the engine lug in top gear at any speed below 80 mph. But the ratio change—no doubt also to improve everyday fuel economy—puts the 200 mark in fifth gear, the one Ford says it used, at about 6400 rpm, or just below the engine’s power peak. "

so going with the auto rear end should definitely do the trick!
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Old 03-18-2014, 04:40 PM   #18
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that is correct!
Here's an interesting fact about the Shelby:
"The Shelby’s specs indicate that 200 was not an anomaly but a hunted target. For 2013, the standard rear-end ratio drops from 3.55 (3.73 with optional Performance pack) to 3.31, making the engine lug in top gear at any speed below 80 mph. But the ratio change—no doubt also to improve everyday fuel economy—puts the 200 mark in fifth gear, the one Ford says it used, at about 6400 rpm, or just below the engine’s power peak. "

so going with the auto rear end should definitely do the trick!
I have changed the actual gears #5 and 6 in my manual trans and I have changed the rear end in my car. I don't recommend swapping to the 3.23 in a manual car unless you have a lot of power. It really makes gears 1 and 2 too tall. The stock ratios are perfect to hit 200 if you just add a little more power.
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Old 03-18-2014, 06:27 PM   #19
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I have changed the actual gears #5 and 6 in my manual trans and I have changed the rear end in my car. I don't recommend swapping to the 3.23 in a manual car unless you have a lot of power. It really makes gears 1 and 2 too tall. The stock ratios are perfect to hit 200 if you just add a little more power.
Man I could really use a taller 6th for highway. Do you think it would be better getting 5th and 6th? Or how does yours feel on the highway?
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Old 03-19-2014, 08:36 AM   #20
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Trade it in for a E60 M5. It does it with only 507 crank hp
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Old 03-19-2014, 08:53 AM   #21
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Let me ask a stupid question; Can't you just put your car on the bottle, get close, say 180-ish and then hit the NO2S?
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Old 03-19-2014, 09:37 AM   #22
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Let me ask a stupid question; Can't you just put your car on the bottle, get close, say 180-ish and then hit the NO2S?

what he asked consider it stupid question #2
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Old 03-19-2014, 03:18 PM   #23
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Man I could really use a taller 6th for highway. Do you think it would be better getting 5th and 6th? Or how does yours feel on the highway?
My 6th is a .68 when I had the 3.73 rear it would toss you back hard at any highway speed with no downshift but I live in the open country and make 100 mile drives everywhere. Occasionally if it is all clear I will cruise at about 150 and with that ratio I was cruising @ 4500 rpm... It was stupid fast in acceleration but really needed another gear for highway cruising. The 3.23 killed my 1/4 mile and made first real tall but it knocked off over 1000 rpm at speed. I just added the bottle to get around the acceleration issues.

So yeah, that is my solution, if it won't quite hit 200 on the blower give it a 300 shot.
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Old 03-19-2014, 03:32 PM   #24
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I will be looking for your video when you go out and hit 200. I don't want to use the bottle.
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Old 03-21-2014, 09:32 AM   #25
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Just add horsepower! My car hit 201.9 at the Texas Mile in October, 2013 ZL1 with a stock auto transmission & the stock auto rearend, I was around 950 rwhp on that pass. Traction & horsepower are the biggest issues to do it in a standing mile. Good luck Jess! I hope you join the club.
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