top end with 3:73 gears?
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Instructor
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From: joliet il
top end with 3:73 gears?
what kind of top end are you guys getting with 3:73 gears.--225/60/15 tires (i think 225, i forgot) 350 trans. what is the response like when doing 70-75mph, and you "punch it"? :seeya
Melting Slicks
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From: Palm Harbor FL
Re: top end with 3:73 gears? (erika1977)
Erika, did you get that spreadsheet I e-mailed you? If you put the info in with your redline, you should get a pretty good idea of your top end. You have a 1:1 final gear ratio on your tranny (3 speed). In terms of "seat of the pants" feel punching it at 70, I wouln't know.
Team Owner
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From: Thomson Georgia
Re: top end with 3:73 gears? (erika1977)
When I punch it at 70 it gets to 100 VERY QUICKLY......I never take it over 110 But I imagine it would go about 130 or so.....Do you like to drive above 100 a lot??
Melting Slicks
Joined: Nov 2000
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From: Palm Harbor FL
Re: top end with 3:73 gears? (erika1977)
By my calcs, if you have a L48 with a 5,350 redline (I think that's what it is) and 27" tires you should redline at approximately 115 MPH. With an L82 and no A/C you would redline (6,000 RPM's) at 130 MPH.
Team Owner
Joined: Jun 2001
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From: Thomson Georgia
Re: top end with 3:73 gears? (erika1977)
not planning on driving over a 100mph alot, but there are times when you just gotta look :cool:
hey, sorry to hear about your mishap! :nonod:
hey, sorry to hear about your mishap! :nonod:
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Joined: Nov 2000
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From: Twin Cities Minnesota
Re: top end with 3:73 gears? (erika1977)
My car runs about 130 at about 6000 rpm, 3.70:1 gears TH400. Not exactly sure of the numbers because I'm not looking at the speedo and tach much at that speed!
But I do know that 130-140 was about all I could get myself to do and that the 5800 rpm shift light had been on for a while...
And for you PC Nancy's that was done on the 5000 foot straight of the Brainard racetrack :rolleyes:
Oh, and the kick at 70 is beautifull, but then again I DO have 460hp...
[Modified by 427V8, 9:36 AM 5/22/2002]
But I do know that 130-140 was about all I could get myself to do and that the 5800 rpm shift light had been on for a while...
And for you PC Nancy's that was done on the 5000 foot straight of the Brainard racetrack :rolleyes:
Oh, and the kick at 70 is beautifull, but then again I DO have 460hp...
[Modified by 427V8, 9:36 AM 5/22/2002]
Melting Slicks
Joined: Nov 2000
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From: Palm Harbor FL
Re: top end with 3:73 gears? (erika1977)
hi 79mako--running a 383/410hp :seeya
OK, this is getting way out of hand. :crazy: :smash:
Le Mans Master
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From: Coming home from Luckenbach Texas
Re: top end with 3:73 gears? (erika1977)
You must have 3:08 gears! :yesnod: One of the beautiful things about 3:55 or 3:73 gears is the amazing acceleration from 70 mph. The other day I punched it going 70 or so. I felt the secondaries crack open...and whooosh! Ooooh baby, I'd better not do that too often :blueangel:
Melting Slicks
Joined: Oct 2001
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From: Halifax, Nova Scotia, Canada
Re: top end with 3:73 gears? (erika1977)
Hi Erika,
With 245/60/15 tires, 3:70, I show 140 MPH @ about 6300-6500 RPM.
Like Keith said, you don't spend a lot of time looking at the tach/speedo.
Another point, even if you can rev to 6000+ rpm, you also need a fair bit of horsepower to push the car at 120+ speeds. You could top out in horespower before you reach the max rpm of the engine.
Barry
With 245/60/15 tires, 3:70, I show 140 MPH @ about 6300-6500 RPM.
Like Keith said, you don't spend a lot of time looking at the tach/speedo.
Another point, even if you can rev to 6000+ rpm, you also need a fair bit of horsepower to push the car at 120+ speeds. You could top out in horespower before you reach the max rpm of the engine.
Barry
Le Mans Master
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From: San Diego CA
Re: top end with 3:73 gears? (erika1977)
My 78 (L-82, 4-speed, 3.70:1 gears) was listed as having a 135 top speed in 78 by R&T - an automatic due to slip would probably be just a hair slower. This is at 6000 rpm.
Melting Slicks
Joined: Nov 2000
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From: Palm Harbor FL
Re: top end with 3:73 gears? (Barry's70LT1)
Another point, even if you can rev to 6000+ rpm, you also need a fair bit of horsepower to push the car at 120+ speeds. You could top out in horespower before you reach the max rpm of the engine.
Barry
Barry
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Instructor
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From: joliet il
Re: top end with 3:73 gears? (79MakoL82)
i pulled the A/C out--i don't know what valve float is. you could go to allchevyengines.com and look at the motor i ordered. 383/410hp. maybe that will tell you more of the set-up i have :seeya
Race Director
Joined: Oct 2000
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From: central FL, near the beach.
Re: top end with 3:73 gears? (erika1977)
does it downshift to 2nd at 70-75.?
Mine does in Drive @wot.; winds 2nd to 90. But that is with 3.08 gears.
3.08 is better for anything except 0-25. They even absorb less HP.
Mine does in Drive @wot.; winds 2nd to 90. But that is with 3.08 gears.
3.08 is better for anything except 0-25. They even absorb less HP.
Melting Slicks
Joined: Nov 2000
Posts: 2,663
Likes: 3
From: Palm Harbor FL
Re: top end with 3:73 gears? (erika1977)
i don't know what valve float is.
OK fella's. Flame away. :cheers:
P.S. I went and checked out the motor. Nice package for $3,200. It does have Hydraulic Flat Tappets, so a safe place to figure your redline would be around 6,000 rpm's.
[Modified by 79MakoL82, 2:50 PM 5/22/2002]
