Here's a pretty good approximation of what the top speeds are going to be in each gear, at the currently-forecasted 7400RPM power peak...


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5 DOT 0 said:What do you think the actual top speed will be stock? 170+? Assuming the Trackey adds another 20 hp.
ArizonaGT said:I'm betting at least 170, but will the car ever see that speed? Probably not. In a race application, the .65 (or whatever) 6th gear is going to make the car lay down once you get into 6th. It will still pull, but not nearly as quick as it did in 5th. True road-racing transmissions usually have a .85-.80 range OD gear that allows them to really use that final gear on-track. So I'm pretty happy to see that the car should be able to hit 160 in 5th.
Sounds like you have a lot more track experience than I do. Are there any tracks out West where a Boss could hit 160 or anywhere close to that? Seems like other than Fontana that might be a stretch. Do they ever do track days on the oval at Fontana? I've done a Mario Andretti experience there where we hit 180-190 on the back straight.ArizonaGT said:Yeah, not anticipating using 6th much (if at all) on track. Again, glad 5th tops out around 160. The combination of this powertrain and gearbox seems really potent.
5 DOT 0 said:Sounds like you have a lot more track experience than I do. Are there any tracks out West where a Boss could hit 160 or anywhere close to that? Seems like other than Fontana that might be a stretch. Do they ever do track days on the oval at Fontana? I've done a Mario Andretti experience there where we hit 180-190 on the back straight.
Hitting over 160 on any track is tough. I'm making 575/545 rwhp/rwtq in my GT500 (~4000 lbs) with 3.73 gears and fifth is .80. At 6100 RPMs you break 160 MPH with a 305/35/18 tire. My rev limiter is set at 6500. The only track I can hit this at (and not launch off turn 1) is Brainerd International which has a MILE long front straightaway with a 60 degree banked Turn 1 that lower horsepower cars take flat out. My GT500 isn't caged, so I'm usually out of the throttle at about 160, although there's a little more there, but would require some braking into Turn 1 (and balls of steel) which will just cost you time anyway. BIR is advertised as the fastest (top speed) track in the US. I'm sure others might argue that point, but the fact is in a car making around 400 rwhp and weighing 3600 lbs, it's unlikely there will be much opportunity to get it past 160 on a road course. If you were to run something like the Texas Mile or out on the salt flats, then you might be able to push it past 170 or 180. Either way I'm hoping TracKey disables the speed limiter.5 DOT 0 said:Sounds like you have a lot more track experience than I do. Are there any tracks out West where a Boss could hit 160 or anywhere close to that? Seems like other than Fontana that might be a stretch. Do they ever do track days on the oval at Fontana? I've done a Mario Andretti experience there where we hit 180-190 on the back straight.ArizonaGT said:Yeah, not anticipating using 6th much (if at all) on track. Again, glad 5th tops out around 160. The combination of this powertrain and gearbox seems really potent.
It is fast, thus my comment about balls of steel. Trust me there's a pucker factor for me, but a little fear can also keep you alive. I probably should cage the car to run there, but haven't. I might do so with the Boss since I'm planning to turn my GT500 into my daily driver again.5 DOT 0 said:That's pretty fast. The only track large track I've ever driven is Sears Point during a Formula Ford class I took with Skip Barber. We were hitting over 100 going into the first corner but that was the fastest those cars would go.
Trust me I "waded" into the deep end. Staying in it just a little longer each lap until you're comfortable. I still slow just by letting off the throttle to around 145 as I enter the turn. The Porsches and BMWs typically top out there and will flat foot it all the way through, whereas I just "maintain" speed at about half throttle. I'm hoping I can be more "flat foot" in the Boss, but will have to see.5 DOT 0 said:Cloud9, I bet that would be pretty hair, and fun, going into a banked corner like that at 160. But only after lots of practice.
cloud9 said:Hitting over 160 on any track is tough. I'm making 575/545 rwhp/rwtq in my GT500 (~4000 lbs) with 3.73 gears and fifth is .80. At 6100 RPMs you break 160 MPH with a 305/35/18 tire. My rev limiter is set at 6500. The only track I can hit this at (and not launch off turn 1) is Brainerd International which has a MILE long front straightaway with a 60 degree banked Turn 1 that lower horsepower cars take flat out. My GT500 isn't caged, so I'm usually out of the throttle at about 160, although there's a little more there, but would require some braking into Turn 1 (and balls of steel) which will just cost you time anyway. BIR is advertised as the fastest (top speed) track in the US. I'm sure others might argue that point, but the fact is in a car making around 400 rwhp and weighing 3600 lbs, it's unlikely there will be much opportunity to get it past 160 on a road course. If you were to run something like the Texas Mile or out on the salt flats, then you might be able to push it past 170 or 180. Either way I'm hoping TracKey disables the speed limiter.
cloud9 said:As we're talking about these top speeds, it occurred to me about the hood design on the Boss. I put hood pins in my GT500 because of the hood flutter I would get over about 130 mph. I just didn't want to worry about that thing coming up at high speeds. I like the re-design of the 2010+ GT500 where the hood sits inside the front grille and is not subject to the same buffeting as the 07-09 design. Looking at the Boss it seems to have the same type of overhanging hood as my GT500. I wonder if there's any risk of it flying open at high speeds? Not that it's a big deal to add hood pins, but just curious. It's probably the same design as the 2011 5.0?
cloud9 said:As we're talking about these top speeds, it occurred to me about the hood design on the Boss. I put hood pins in my GT500 because of the hood flutter I would get over about 130 mph. I just didn't want to worry about that thing coming up at high speeds. I like the re-design of the 2010+ GT500 where the hood sits inside the front grille and is not subject to the same buffeting as the 07-09 design. Looking at the Boss it seems to have the same type of overhanging hood as my GT500. I wonder if there's any risk of it flying open at high speeds? Not that it's a big deal to add hood pins, but just curious. It's probably the same design as the 2011 5.0?
cloud9 said:As we're talking about these top speeds, it occurred to me about the hood design on the Boss. I put hood pins in my GT500 because of the hood flutter I would get over about 130 mph. I just didn't want to worry about that thing coming up at high speeds. I like the re-design of the 2010+ GT500 where the hood sits inside the front grille and is not subject to the same buffeting as the 07-09 design. Looking at the Boss it seems to have the same type of overhanging hood as my GT500. I wonder if there's any risk of it flying open at high speeds? Not that it's a big deal to add hood pins, but just curious. It's probably the same design as the 2011 5.0?