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Top speed for backdraft with 402R
I was driving tonight and noticed that at 2000 RPM I was going 60 MPH.
At 4000 RPM I was going an even 120 MPH. I have a backdraft with a 402R and a TKO 500 tranny. I have only had the opportunity to get up to 130 MPH a few times but am wondering what the top speed with this setup is ? That is if anyone has actually wound theirs up at all. Paul |
There is a gear calculator that's easy to hunt up on the net. You just need to know the rear end ratio and trans type, doesn't matter that it is a Backdraft or not.
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As I remember, even CS and Ken Miles had a hard time topping 160. Its the aero thing.
With that big motor you might do a little better. Bring it out to the great white dyno and find out. www.saltflats.com - check out the 130 and 150 clubs. My Miata went 152, think you can top that? |
This will help you get a feel for what's involved...
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Heres another one...
http://www.idavette.net/tech/ratioc.htm |
I guess if you use a linear progression then @ 10,000 rpm you would be going 300 MPH. :rolleyes: ;)
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If you try to overpower the poor aerodynamics with shear horsepower, you might tear the fiberglass body off the frame ! :LOL:
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Larry (Dr.Mayf) is a cool guy - runs a twin turbo'd "Tiger" at bonneville. Knows his stuff, too.
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http://www.secondstrike.com/Technical/GearCalc.asp
At 7000 rpm, you should be doing 209 mph!:eek: |
Gunrack's front end starts to float at 155 (closed course, with a pro driver). I NEVER took it past 140 on the track straights, maybe I'm a woose, but it SCARED me.
I don't have the eyesight and the reflexes for this kinda stuff anymore. I'm guessing that our late-1950's aerodynamics are like a high-aspect wing formula... She wants to FLY!!! A detachable airdam in the front, maybe, professional tweaking of the suspension, maybe, and (God forbid) a functional wing in the rear? Not for me. I will wave as you, literally, fly past. UT |
I have a Backdraft with a ford crate motor 351W with just under 400 Horse.
Mya favorite gear 3 and 4 I go zero to 80-100 MPH in no time in 3rd gear. 4th gear at approx 4500 5200 RPM i'm reaching 125 or so. Still not even hitting the 5th gear. I could never find enough space to get the RMP up over 3800 in 5th gear and that was hoovering a about 135 MPH So your being a 402 i'm sure will be pretty good. I havent event seen what mine can really do just yet. GAry |
I have 3.08's in the rear and .67 OD.
I don't even want to think what that works out to at 6250 rpms if wind resistance were not an issue. :eek: All I know is that I'll never have ones big enough to find out what 230 feels like. :LOL: |
How fast can one go? Two words, one name; Dick Smith. Obviously 160 is no limit. It may not be much fun past that though! LOL Like you say ROUSHAC, "Nolite id cogere, cape malleum majorem"!
http://www.clubcobra.com/photopost/d...ith_2005sm.jpg Steve |
Ohh well, just drive and have fun. Open her up on a nice Sunday morning
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