Welcome to V8Buick.com.
Page 1 of 3 123 LastLast
Results 1 to 25 of 61
  1. #1
    Join Date
    Jul 2004
    Location
    Florida
    Posts
    1,780

    Default I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    According to the calculators Derek was telling me about, 300hp and a car that weighs 4176lb should go 13s. thats well within range of the 350sbb but arent 13s unheard of in B bodies with small blocks making a mere 300hp?

    Found a weigh station at the landfill near where I live. I can drive on it for free and weigh my car. It shows up right on a display as you drive in. So I went for it. I was surprised it only weighed 4176lb. That is after I deducted for gas, passengers and junk in the trunk.

    Could I really do 13s with only 300hp? Wait. I miscalculated. The temp would have to be 10 below zero. Never mind. with driver and gas it would be 4400lbs. Low 14s. at 65f

    I would need 325hp to propel my land yacht down the track in 13.98 seconds at 65F, 10feet above sea level, 30mb barometric pressure, and 40% humidity according the hp calculator. Is this realistic or just theory.
    1971 LeSabre Custom 4 door hardtop
    1973 LeSabre Custom 2 door hardtop

    My Free RPM-Speed-Gear Ratio Calculation Tool

  2. #2
    Join Date
    Feb 2002
    Location
    LI,NY
    Posts
    19,837

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    What has been done to your 73 350 to get 300hp? From the factory, that engine has less than 200 hp
    Jason Cook
    BPG #1675
    "Expert in obsolete technology"

    1968 Riviera GS- some assembly required
    1969 Riviera GS- my first car
    1969 GS-350
    1970 Stage 1 4 speed Aquamist
    1970 GS-455 Bamboo Cream beater
    1971 GS 455 11.93@113.36
    1972 GS-350
    1970 Stellar Industries vintage go kart

    Deo duce, ferro comitante

  3. #3
    Join Date
    Jul 2004
    Location
    Florida
    Posts
    1,780

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    Quote Originally Posted by buick64203 View Post
    What has been done to your 73 350 to get 300hp? From the factory, that engine has less than 200 hp
    I didnt mean to give the impression that my engine currently makes that amount, only that a sbb 350 can be built to make that amount and much more according to cursory reading in the small block forum. I just thought that 13s in a B body would requre HP in the 400s and big block only need apply.

    Im assuming that the 300hp would have to be measured at the rear wheels after the auto trans takes its share and the drivetrain takes its share as well as accessories.
    1971 LeSabre Custom 4 door hardtop
    1973 LeSabre Custom 2 door hardtop

    My Free RPM-Speed-Gear Ratio Calculation Tool

  4. #4
    Join Date
    Oct 2006
    Location
    Edmonton, Ab.
    Posts
    120

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    To manage that with 300whp and 4400lbs you'll need to set up the car to maximize the run. The gears need to be set to be near redline running through the traps and the car needs to dead hook off the line.

    It'll probably need 4.56 gears, at least a 3000rpm stall converter and slicks to get close to running that time. Not many people running b bodies are willing to do that much on a car that's better suited to being a cruiser.
    Keith.

    1970 Wildcat 2DR HT.

  5. #5
    Join Date
    Jul 2004
    Location
    Florida
    Posts
    1,780

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    Quote Originally Posted by 70Cat View Post
    To manage that with 300whp and 4400lbs you'll need to set up the car to maximize the run. The gears need to be set to be near redline running through the traps and the car needs to dead hook off the line.

    It'll probably need 4.56 gears, at least a 3000rpm stall converter and slicks to get close to running that time. Not many people running b bodies are willing to do that much on a car that's better suited to being a cruiser.
    how much flywheel horsepower equals 300 wheel horsepower? wih automatic? with manual?
    1971 LeSabre Custom 4 door hardtop
    1973 LeSabre Custom 2 door hardtop

    My Free RPM-Speed-Gear Ratio Calculation Tool

  6. #6
    Join Date
    Oct 2006
    Location
    Edmonton, Ab.
    Posts
    120

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    Quote Originally Posted by garybuick View Post
    how much flywheel horsepower equals 300 wheel horsepower? wih automatic? with manual?
    Give or take about 350hp flywheel, manual would be closer to 340hp, auto around 360hp. Lots of variables, tire size and weight, gearing type and ratio will affect rwhp rating as well.
    Keith.

    1970 Wildcat 2DR HT.

  7. #7
    Join Date
    May 2013
    Posts
    3,527

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    Would take an easy 450hp to run a lesabre to mid 13's
    70 stage 1 Back under construction
    540 Tomahawk, F1c-94 Procharger
    Holley HP EFI, Stage 2 TE's
    Shooting for 1khp at the tire and 5.50s

    .

  8. #8

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    Hugger is correct.
    Adam Martin
    BPG# 1358
    BCA# 39765
    1970 Buick Skylark Custom 455 Coupe
    www.antiqueautomotiveservice.com

    http://www.antiqueautomotiveservice.com/images/logo_top.gif

  9. #9
    Join Date
    Jul 2004
    Location
    Florida
    Posts
    1,780

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    Quote Originally Posted by Smartin View Post
    Hugger is correct.
    thats what I thought but the calculators were saying only 300 to 325 which seemed very low to me. I guess those calculators arent very accurate. I got excited for nothings. I thought "hey, this might actually be approachable"

    I thought Smartin had a 71 Centurion that ran 13s and could have hit 12s he said. 455 car. no idea what mods if any he made to it.
    1971 LeSabre Custom 4 door hardtop
    1973 LeSabre Custom 2 door hardtop

    My Free RPM-Speed-Gear Ratio Calculation Tool

  10. #10

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    My car was 447hp at the crank. Mid 13's in August Midwest humidity and heat. Good weather it had a 12 in it but never had a chance.
    Adam Martin
    BPG# 1358
    BCA# 39765
    1970 Buick Skylark Custom 455 Coupe
    www.antiqueautomotiveservice.com

    http://www.antiqueautomotiveservice.com/images/logo_top.gif

  11. #11
    Join Date
    Jul 2004
    Location
    Florida
    Posts
    1,780

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    Quote Originally Posted by Smartin View Post
    My car was 447hp at the crank. Mid 13's in August Midwest humidity and heat. Good weather it had a 12 in it but never had a chance.
    what mods did you make?
    1971 LeSabre Custom 4 door hardtop
    1973 LeSabre Custom 2 door hardtop

    My Free RPM-Speed-Gear Ratio Calculation Tool

  12. #12

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    Heavily ported 70 Stage1 iron heads
    Edelbrock Performer intake, gasket matched
    John Osborne prepped Qjet
    Roller rockers
    TA 288-98H cam
    .030 overbore
    Forged pistons with smaller dish (actual static compression was around 9.5-1)
    Rotating assembly was balanced
    Rods polished
    2800 stall convertor
    TH400 with Trans-go shift kit
    3.23 posi rear
    Crane XR-i ignition with John Osborne curved distributor
    Adam Martin
    BPG# 1358
    BCA# 39765
    1970 Buick Skylark Custom 455 Coupe
    www.antiqueautomotiveservice.com

    http://www.antiqueautomotiveservice.com/images/logo_top.gif

  13. #13
    Join Date
    Sep 2012
    Location
    MI.
    Posts
    2,868

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    You could probably do it if in you had 300 HP and 400 ft lbs of torque at the rear wheels.


    You need torque to move that barge! A sbb stroker would work real nice for you IMO, if you don't want to go to a 455. The added cubes would go a long way to adding needed low end torque to get that thing moving. A mild roller cam with at least .550" lift with around 202* and 212* dur @ .050" with a 112 LSA in that stroker would get that barge moving real good!(ask me how I know) Of coarse head porting would be needed as well. GL









    Derek
    64 Skylark,401 Nailhead,ST400,3.23:1Posi
    64 Skylark,305Vortec sbc,700R4,12blt Posi 3.73,low 14s. A sbb 300 stroker planned for it.
    72 Skylark Convert. in progress, Not yet assembled 455 .020 over,70 heads with stage1 valves,gasket matched and bowl blended,transmission to be determined.
    65 Chevy Impala,4,400lbs,383sbc,700R4,3.07posi,1.80 60' foot time low 13s @101mph,15mpg city,24mpg highway

  14. #14
    Join Date
    Feb 2002
    Location
    Oakland Gardens, N.Y.
    Posts
    27,214

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    You can lose as much as 20% from the crank to the rear wheels, so a 450 HP engine could lose 90 HP or more. The Dyno figures are corrected HP and without water pump, alternator and power steering pump. So in the real world, you could be putting less power to the wheels considering parasitic losses and warm weather.
    Larry
    1998 "Fully Optioned" SC3800 Riviera
    70 GS 455 Stage1, TSP 470, 602 HP@ 5900, 589 TQ @ 4900
    TA Hyd Roller Cam, 230*/238*, 112, .544"/.577" lift, 4-7 swap
    MSD Digital 6+, Ignitionman Distributor w/MSD trigger
    THM400 with Ultimate 258mm converter, Gear Vendors OD
    AED 1000 HO Carb, 800 CFM 7042240 Quadrajet
    8.5 10 bolt, 3.73's Race weight 4025lbs.
    Best E.T. 11.54 Best MPH, 116.06
    Larrymta@verizon.net, GSCA #291
    BPG # 1063
    N.E. GS/GN Club Assistant Director

  15. #15
    Join Date
    Jul 2004
    Location
    Florida
    Posts
    1,780

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    Quote Originally Posted by LARRY70GS View Post
    You can lose as much as 20% from the crank to the rear wheels, so a 450 HP engine could lose 90 HP or more. The Dyno figures are corrected HP and without water pump, alternator and power steering pump. So in the real world, you could be putting less power to the wheels considering parasitic losses and warm weather.
    how much hp does a TH400 siphon off vs a manual trans? I heard its quite a bit more than just 10 or 15. What do you think Larry?
    1971 LeSabre Custom 4 door hardtop
    1973 LeSabre Custom 2 door hardtop

    My Free RPM-Speed-Gear Ratio Calculation Tool

  16. #16
    Join Date
    Sep 2002
    Location
    hesperia,calif
    Posts
    508

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    once it starts pushing air it will gobble up HP

  17. #17
    Join Date
    Jul 2004
    Location
    Florida
    Posts
    1,780

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    Quote Originally Posted by chris lee View Post
    once it starts pushing air it will gobble up HP
    how much wind resistance is that calculator factoring in to arrive at a needed HP of 300? I mean is that for a bullet shaped car or for a brick wall shaped car? The 73 is actually kind of rounded in the front and has nice airflow over the top and back. more than a 55 chevy or some such.
    1971 LeSabre Custom 4 door hardtop
    1973 LeSabre Custom 2 door hardtop

    My Free RPM-Speed-Gear Ratio Calculation Tool

  18. #18
    Join Date
    Feb 2002
    Location
    Oakland Gardens, N.Y.
    Posts
    27,214

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    Quote Originally Posted by garybuick View Post
    how much hp does a TH400 siphon off vs a manual trans? I heard its quite a bit more than just 10 or 15. What do you think Larry?
    Not sure but the 400 takes more to run than a manual.
    Larry
    1998 "Fully Optioned" SC3800 Riviera
    70 GS 455 Stage1, TSP 470, 602 HP@ 5900, 589 TQ @ 4900
    TA Hyd Roller Cam, 230*/238*, 112, .544"/.577" lift, 4-7 swap
    MSD Digital 6+, Ignitionman Distributor w/MSD trigger
    THM400 with Ultimate 258mm converter, Gear Vendors OD
    AED 1000 HO Carb, 800 CFM 7042240 Quadrajet
    8.5 10 bolt, 3.73's Race weight 4025lbs.
    Best E.T. 11.54 Best MPH, 116.06
    Larrymta@verizon.net, GSCA #291
    BPG # 1063
    N.E. GS/GN Club Assistant Director

  19. #19
    Join Date
    Mar 2004
    Location
    Edmonton Alberta
    Posts
    15,235

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    If you want to go quick with that car you have two options assuming you want to keep a Buick powerplant in there:

    1. Boost the 350, even a stock 350 under boost is a monster
    2. Swap to a 455
    __________________________________________________ __________________________________
    My book called Small Block Buick Performance covering the V6, 215, 300, 340, and Buick 350 engines will be released soon.

    http://www.v8buick.com/forumdisplay....rformance-Book
    __________________________________________________ ____________________________
    1970 Buick Skylark Turbo 350 street/strip

  20. #20
    Join Date
    Feb 2002
    Location
    North Carolina
    Posts
    26,447

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    Quote Originally Posted by garybuick View Post
    how much hp does a TH400 siphon off vs a manual trans? I heard its quite a bit more than just 10 or 15. What do you think Larry?

    https://www.hagerty.com/articles-vid.../13/horsepower


    A comment below the article makes a relevant observation:

    "I am a Professional Engine builder by trade and I have done a Ton of Engine dyno then chassis dyno comparrisons(sic). Older auto trannies, TH400,C6 typically show a 19-22% loss Older 4 speed manuals almost always show a 15-16% loss Newer AT cars, Camero(sic), firebird 12-15% New manual trans is 8-11% New auto 4x4 truck is 25-28% These are verified over 20 years of testing, so far I can tell if something is really wrong or if the hp claims were bs."
    Jim Lore
    BPG 1037
    "If you cannot clear up the confusion at least make the confusion clear."

  21. #21
    Join Date
    Jul 2004
    Location
    Florida
    Posts
    1,780

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    Quote Originally Posted by flynbuick View Post
    https://www.hagerty.com/articles-vid.../13/horsepower


    A comment below the article makes a relevant observation:

    "I am a Professional Engine builder by trade and I have done a Ton of Engine dyno then chassis dyno comparrisons(sic). Older auto trannies, TH400,C6 typically show a 19-22% loss Older 4 speed manuals almost always show a 15-16% loss Newer AT cars, Camero(sic), firebird 12-15% New manual trans is 8-11% New auto 4x4 truck is 25-28% These are verified over 20 years of testing, so far I can tell if something is really wrong or if the hp claims were bs."
    nice quote Jim! so 15% loss is what I should figure. What is that then about 360hp? kinda getting out of range for the 350. Id like a nice smooth idle at the stop sign.
    1971 LeSabre Custom 4 door hardtop
    1973 LeSabre Custom 2 door hardtop

    My Free RPM-Speed-Gear Ratio Calculation Tool

  22. #22
    Join Date
    Feb 2002
    Location
    Oakland Gardens, N.Y.
    Posts
    27,214

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    Quote Originally Posted by garybuick View Post
    nice quote Jim! so 15% loss is what I should figure.
    So you are going to convert your car to a stick?
    Larry
    1998 "Fully Optioned" SC3800 Riviera
    70 GS 455 Stage1, TSP 470, 602 HP@ 5900, 589 TQ @ 4900
    TA Hyd Roller Cam, 230*/238*, 112, .544"/.577" lift, 4-7 swap
    MSD Digital 6+, Ignitionman Distributor w/MSD trigger
    THM400 with Ultimate 258mm converter, Gear Vendors OD
    AED 1000 HO Carb, 800 CFM 7042240 Quadrajet
    8.5 10 bolt, 3.73's Race weight 4025lbs.
    Best E.T. 11.54 Best MPH, 116.06
    Larrymta@verizon.net, GSCA #291
    BPG # 1063
    N.E. GS/GN Club Assistant Director

  23. #23
    Join Date
    Jul 2004
    Location
    Florida
    Posts
    1,780

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    Quote Originally Posted by LARRY70GS View Post
    So you are going to convert your car to a stick?
    Well it would make my car interesting instead of just another boring 73 lesabre. Ive been following the munice 3 speed threads lately. Its not ike my car is worth anything stock. Itd be funner to drive.
    1971 LeSabre Custom 4 door hardtop
    1973 LeSabre Custom 2 door hardtop

    My Free RPM-Speed-Gear Ratio Calculation Tool

  24. #24
    Join Date
    Feb 2002
    Location
    Oakland Gardens, N.Y.
    Posts
    27,214

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    Quote Originally Posted by garybuick View Post
    Well it would make my car interesting instead of just another boring 73 lesabre. Ive been following the munice 3 speed threads lately. Its not ike my car is worth anything stock. Itd be funner to drive.
    You have to be pretty good with a stick to power shift it at the track. It is also much harder to launch a stick car and get a good 60' time. Both of those things are going to work against your plans for 13's. That's assuming you have the HP to do it.
    Larry
    1998 "Fully Optioned" SC3800 Riviera
    70 GS 455 Stage1, TSP 470, 602 HP@ 5900, 589 TQ @ 4900
    TA Hyd Roller Cam, 230*/238*, 112, .544"/.577" lift, 4-7 swap
    MSD Digital 6+, Ignitionman Distributor w/MSD trigger
    THM400 with Ultimate 258mm converter, Gear Vendors OD
    AED 1000 HO Carb, 800 CFM 7042240 Quadrajet
    8.5 10 bolt, 3.73's Race weight 4025lbs.
    Best E.T. 11.54 Best MPH, 116.06
    Larrymta@verizon.net, GSCA #291
    BPG # 1063
    N.E. GS/GN Club Assistant Director

  25. #25
    Join Date
    Jul 2004
    Location
    Florida
    Posts
    1,780

    Default Re: I weighed my 73 LeSabre today and 300hp should be enough to get into the 13s

    Quote Originally Posted by LARRY70GS View Post
    You have to be pretty good with a stick to power shift it at the track. It is also much harder to launch a stick car and get a good 60' time. Both of those things are going to work against your plans for 13's. That's assuming you have the HP to do it.
    what I lose of shifting speed i gain in less hp lost to the auto. Plus the fun factor. But could a 350 do it and have a nice smooth idle?
    1971 LeSabre Custom 4 door hardtop
    1973 LeSabre Custom 2 door hardtop

    My Free RPM-Speed-Gear Ratio Calculation Tool

 

 
Page 1 of 3 123 LastLast

Similar Threads

  1. Weighed the GS today
    By Heavy D in forum The Bench
    Replies: 14
    Last Post: 11-06-2011, 08:24 AM
  2. i weighed my car
    By Joshua in forum The Bench
    Replies: 9
    Last Post: 05-23-2011, 07:49 PM
  3. 65 Riviera, ever weighed one?
    By Tom Miller in forum A boatload of fun
    Replies: 5
    Last Post: 01-23-2005, 07:54 AM
  4. Ok We weighed my pig
    By RACEBUICKS in forum Race car chassis tech
    Replies: 47
    Last Post: 11-10-2004, 10:17 PM
  5. Pumpkin got weighed!
    By ropelie in forum The Bench
    Replies: 10
    Last Post: 09-13-2004, 09:24 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Back to top