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04-13-2007, 12:51 AM
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CC Member
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Join Date: Jun 2006
Location: Oviedo (Outside Orlando),
fl
Cobra Make, Engine: Backdraft #486 402r This is my 2nd backdraft.
Posts: 57
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Not Ranked
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
__________________
I have been corrupted by perfume and gasoline!!
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04-13-2007, 07:16 AM
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CC Member
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Join Date: Nov 2000
Location: Flower Mound, TX,
tx
Cobra Make, Engine: Lonestar LS 427, Keith Craft 501,Toploader
Posts: 883
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Not Ranked
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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" It ain't no big deal" 
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04-13-2007, 07:48 AM
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CC Member
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Join Date: Mar 2007
Cobra Make, Engine:
Posts: 122
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Not Ranked
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?
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DavidinDurango
mostly fords, with "some stuff"
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04-13-2007, 07:59 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,005
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Not Ranked
This will help you get a feel for what's involved...
Quote:
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Originally Posted by paulmcconnon
...am wondering what the top speed with this setup is?
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Remember, a Cobra is just a hair more aerodynamic than a school bus. That being said, here's a link that explores the factors involved in figuring out just what your top speed might be. http://www.mayfco.com/cobra.htm |
04-13-2007, 08:17 AM
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CC Member
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Join Date: Oct 2006
Location: Long Island,
ny
Cobra Make, Engine: Midstates, 501
Posts: 120
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Not Ranked
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04-13-2007, 08:20 AM
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Senior Club Cobra Member
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Join Date: Feb 2000
Location: Midland Park,
NJ
Cobra Make, Engine: ERA 389 427s/o
Posts: 1,247
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Not Ranked
I guess if you use a linear progression then @ 10,000 rpm you would be going 300 MPH.   |
04-13-2007, 08:23 AM
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CC Member
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Join Date: May 2000
Location: Northern VA,
VA
Cobra Make, Engine: Classic Roadsters
Posts: 2,765
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Not Ranked
If you try to overpower the poor aerodynamics with shear horsepower, you might tear the fiberglass body off the frame ! 
.
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LIFE IS TOO SHORT TO WORRY ABOUT GOOD GAS MILEAGE
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Utinam logica falsa tuam philosophiam totam suffodiant!
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04-13-2007, 11:59 AM
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CC Member
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Join Date: Nov 2006
Location: Ft. Myers,
FL
Cobra Make, Engine: None yet
Posts: 43
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Not Ranked
Quote:
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Originally Posted by CobraEd
If you try to overpower the poor aerodynamics with shear horsepower, you might tear the fiberglass body off the frame !
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You just might have a point here. Reminds me of my '67 Mustang I owned back in the '70's. I had a 390 CID putting out about 335 horse from the factory. Naturally I tweaked the timing a little and put a 780 CFM Holley on it and never did know what its top end was. I was too scared! At 120 MPH I could feel the front end getting light and I still had plenty of pedal left before floor boarding it. so I'm guessing between 130 to maybe 140? I really don't know. 
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Dick 
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04-13-2007, 12:11 PM
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CC Member
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Join Date: Mar 2007
Cobra Make, Engine:
Posts: 122
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Not Ranked
Larry (Dr.Mayf) is a cool guy - runs a twin turbo'd "Tiger" at bonneville. Knows his stuff, too.
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Originally Posted by patrickt
Remember, a Cobra is just a hair more aerodynamic than a school bus. That being said, here's a link that explores the factors involved in figuring out just what your top speed might be. http://www.mayfco.com/cobra.htm |
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DavidinDurango
mostly fords, with "some stuff"
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04-13-2007, 01:52 PM
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CC Member
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Join Date: Mar 2007
Location: Clearwater,
Fl
Cobra Make, Engine: Looking for one
Posts: 52
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Not Ranked
Last edited by Shelbyfan; 04-13-2007 at 01:55 PM..
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04-14-2007, 12:06 PM
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CC Member
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Join Date: Mar 2003
Location: southeastern,
OK
Cobra Make, Engine: BDR #139, Indigo blue, white stripes, KeithCraft 351W, 315 WHP, 17" Boyd Smoothies, dual roll bars, gunrack, assorted young females
Posts: 1,308
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Not Ranked
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
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Eagles soar- but weasels don't get sucked into jet engines.
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04-14-2007, 07:04 PM
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CC Member
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Join Date: Aug 2006
Cobra Make, Engine: BDR, 351W, 400 Horses
Posts: 520
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Not Ranked
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
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04-14-2007, 08:22 PM
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Senior Club Cobra Member
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Join Date: Feb 2006
Location: Syracuse,
NY
Cobra Make, Engine: BDR 228, Roush 342R, 457HP/428TQ, modified AOD
Posts: 1,378
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Not Ranked
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. 
All I know is that I'll never have ones big enough to find out what 230 feels like.
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Dave
Nolite id cogere, cape malleum majorem - Don't force it, get a bigger hammer.
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04-25-2007, 12:11 PM
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Stolen Avitar
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Join Date: Oct 2004
Location: Brunswick,
GA
Cobra Make, Engine: BDR 1311 428PI
Posts: 3,044
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Not Ranked
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"!
Steve
Last edited by lovehamr; 04-25-2007 at 02:27 PM..
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05-03-2007, 07:23 PM
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CC Member
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Join Date: Aug 2006
Cobra Make, Engine: BDR, 351W, 400 Horses
Posts: 520
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Not Ranked
Ohh well, just drive and have fun. Open her up on a nice Sunday morning
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These cars are way too cool to keep in the garage.
And, Life is too short to worry about gas milage. So, Lets cruise!!MECOOL:
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