Top Speeds for ITS?

[Eric Parham]

I'm trying to minimize costs by getting the right R&P the first time. Anyone know top speeds for ITS cars at Road Atlanta, Mid-Ohio, Watkins Glen, NHIS and/or Lime Rock? The project is an ITS GTI VR6, but speed data for any/all ITS cars would be greatly appreciated.

[benspeed]

My ITS RX7 would do 140 + at Pocono running a 4:88 in 4th. My other RX7 did the same in 5th with a 5:12.

[Jeremy Billiel]

With my stock motored GSR I am at about 120 MPH at both NHIS and LRP on the straights.

[Eagle7]

Mid-Ohio I'm at about 115. I doubt if anyone's over 120.

[Greg Amy]

I doubt if anyone's over 120.
[/b]
Oooo, Marty's gonna be pissed if he found out the top speed of a certain ITA car at Mid-Ohio...

;)

[JeffYoung]

200 mph baby! V8 power! When I get on the nitrous, it's 220!

[Andy Bettencourt]

LRP: My 4.3 is perfect. No 5th gear on the front straight. Braking into T1 at redline.

NHIS: Again, perfect. No 4th gear anywhere but the front straight. Braking into T6 at redline.

This gear was a significant improvement at these tracks over my 4.88 due to less shifts.

[seckerich]

My ITS RX7 would do 140 + at Pocono running a 4:88 in 4th. My other RX7 did the same in 5th with a 5:12.
[/b]
I would assume you were reading this on the stock speedo on the dash? Great for the EGO but not a chance in the real world. :D 128 at VIR with legal gears and I won't say which one.

[Eagle7]

Oooo, Marty's gonna be pissed if he found out the top speed of a certain ITA car at Mid-Ohio...

;) [/b]

Dad-gum sissy cars are s'posd tu be slower. What's this world coming to, anyway... :014:



OK, I checked my logs - 118 MPH (based on a Hoosier R6 225/45-15 circum of 72.13"). From the time I nail it in the middle of the keyhole to braking for T7 is 19.5 seconds. I didn't see anyone pulling me on the straight, even Rob when he lapped me.

[Greg Amy]

Dad-gum sissy cars are s'posd tu be slower. What's this world coming to, anyway... :014:[/b]
;)

Yeah, but don't forget: your car "handles". It's obvious that in a tete-a-tete battle you'd kick my butt! The CRXs certainly did!

20.0 seconds, 121.16 mph, GPS-based data acq-derived...

[Eagle7]

;)

Yeah, but don't forget: your car "handles". It's obvious that in a tete-a-tete battle you'd kick my butt! The CRXs certainly did!

20.0 seconds, 121.16 mph, GPS-based data acq-derived... [/b]

Maybe the car could whup you, but I can't. The egg was 3 seconds faster than me.

[its66]

I would assume you were reading this on the stock speedo on the dash? Great for the EGO but not a chance in the real world. :D 128 at VIR with legal gears and I won't say which one.
[/b]

Steve, you know that there are no secrets in ITS anymore. We all KNOW that you run a modified 1.89:1 out a diesel ford courier pick up at VIR. That way you only use first and second gear. Fewer shifts = better lap times.. :P :eclipsee_steering:

You can't fool us.

[JeffYoung]

Jim, that's just what it looks like on the shifter tunnel of Steve's car. But I've been to his shop and I know the secret. He's got himself a 2 speed Powerglide in that sucker. I always wondered how he managed to drive with one hand out the window.....

3.45 rear gear on my car, 225/45/13s, I think a .83 fifth gear, about 125 mph at teh end of the backstraight at VIR with the new aero friendly top.

[seckerich]

Steve, you know that there are no secrets in ITS anymore. We all KNOW that you run a modified 1.89:1 out a diesel ford courier pick up at VIR. That way you only use first and second gear. Fewer shifts = better lap times.. :P :eclipsee_steering:

You can't fool us.
[/b]
Busted!! It is the Aussie spec diesel. 3.-- or something like that. You do get to third on the back straight. :P

[JLawton]

Dad-gum sissy cars are s'posd tu be slower. What's this world coming to, anyway... :014:


[/b]


You think Greg's car is a sissy car. First time racing there I think my little ol' plastic sissy car was doing 117mph according to the DL-1?? :P


Sorry, couldn't resist!! :D

[benspeed]

I would assume you were reading this on the stock speedo on the dash? Great for the EGO but not a chance in the real world. :D 128 at VIR with legal gears and I won't say which one.
[/b]

Following Nick's RX7 and the 2 Autotechnic BMWs - Rob had a working speedo in his car. It was a 4 car drafting train - that was the numba, but from a stock speedo in an E36.

I'd agree 130 might be tops without a draft.

[seckerich]

Following Nick's RX7 and the 2 Autotechnic BMWs - Rob had a working speedo in his car. It was a 4 car drafting train - that was the numba, but from a stock speedo in an E36.

I'd agree 130 might be tops without a draft.
[/b]
Just for reference:

I will assume a .76 GTU fifth gear and R6 Hoosier at 22.8 diameter.

With a 4.88 in 4th gear:
8500 = 118
9000 = 125
9500 = 132
10000 = 139

With a 5.12 in 5th
8000 = 140

Remember that a stock speedo does not know you changed tire diameter or rear gear ratio. Great numbers for BS over beer but not real world data.

[Andy Bettencourt]

<div align="left">Gear Mph per 1000 RPM Mph @6800 RPM Mph @7300 RPM</div>
<div align="left">--------------------------------------------------------</div>
<div align="left">1 5.08 35 37</div>
<div align="left">2 8.45 57 62</div>
<div align="left">3 12.00 82 88</div>
<div align="left">4 15.96 109 117</div>
<div align="left">5 19.71 134 144</div>
<div align="left"> </div>
<div align="left">This is using a gear calc for my Miata ratios (tranny and 4.3). So:</div>
<div align="left"> </div>
<div align="left">LRP: top for me is about 115-117</div>
<div align="left">NHIS: 108-110</div>

[benspeed]

Just for reference:

I will assume a .76 GTU fifth gear and R6 Hoosier at 22.8 diameter.

With a 4.88 in 4th gear:
8500 = 118
9000 = 125
9500 = 132
10000 = 139

With a 5.12 in 5th
8000 = 140

Remember that a stock speedo does not know you changed tire diameter or rear gear ratio. Great numbers for BS over beer but not real world data.
[/b]

Yup, your stuff above is right on - GTU and 50 series tires running at 8200. Speedo isn&#39;t like data aq - I never run a speedo because I only care about time. (PS - now that I recall I think my other rear was a 4:66 - that&#39;s what Kip told me when I bought the car in &#39;04 - always got some eyebrows on that one.)

But seriously - only 128 at VIR?



<div align="left">Gear Mph per 1000 RPM Mph @6800 RPM Mph @7300 RPM
<div align="left">--------------------------------------------------------</div>
<div align="left">1 5.08 35 37</div>
<div align="left">2 8.45 57 62</div>
<div align="left">3 12.00 82 88</div>
<div align="left">4 15.96 109 117</div>
<div align="left">5 19.71 134 144</div>
<div align="left"> </div>
<div align="left">This is using a gear calc for my Miata ratios (tranny and 4.3). So:</div>
<div align="left"> </div>
<div align="left">LRP: top for me is about 115-117</div>
<div align="left">NHIS: 108-110</div>

[/b][/quote]


That explains your strong Pocono results - that tranny can handle some speed!

So what&#39;s my Fiero speed potential? (I&#39;ll buy you a soda)

[Andy Bettencourt]

That is assuming that the car CAN push it through the air.

[Rabbit07]

;)

Yeah, but don&#39;t forget: your car "handles". It&#39;s obvious that in a tete-a-tete battle you&#39;d kick my butt! The CRXs certainly did!

20.0 seconds, 121.16 mph, GPS-based data acq-derived...
[/b]

Just to add salt to the wound. I don&#39;t have data, but I was bouncing off the rev limiter before braking for 7. 7000 rpm in 4th would put me at over 120 also. :eclipsee_steering:

[benspeed]

LOL - you can see I ain&#39;t working too hard today by number of posts. :lol:


Show me the MPH! (it&#39;ll be lame like 120 but you don&#39;t want to say since you&#39;d like to chuckle at the $$ wasted if I finish this thing)

Note to new racers - $6000 and counting on a car that is a questionable racer - buy a built and proven car!

[bldn10]

"Remember that a stock speedo does not know you changed tire diameter or rear gear ratio. Great numbers for BS over beer but not real world data."



I remember back in 1995 the first time I was out in my new RX-7 w/ 5:12 and working speedo. Showing close to 160 at end of the long Memphis straight. Boy, was I excited about that! :eclipsee_steering: Til I thought about it.



I would think that Charlotte would yield the highest top speed - what have people done there?



Steve, we missed you at N&#39;ville.

[seckerich]

Missed seeing you guys Bill. Work got in the way this week and the car ate a pilot bearing in the shop. Just lacked motivation to pull it out and fix it. Didn&#39;t help that I had no spare. :D