Performance numbers - NCRS Discussion Boards

Performance numbers

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Anthony L.
    Expired
    • May 13, 2008
    • 18

    Performance numbers

    I've checked several sources, including various web sites. I cannot find reliable information regarding performance figures for my car. I have a 1969 with a 427/400 hp 4 speed (no air cond.) and a 3.36 rear end. Does anyone know what this car is suppose to do 0 - 60 and in the quarter mile, and top end? I also know that if the numbers are based on the stock tires from 1969, the times will be bad. Is there any information that shows what the car should be able to do while using newer radial tires?
  • Stuart F.
    Expired
    • August 31, 1996
    • 4676

    #2
    Re: Performance numbers

    Anthony;

    I'm sure someone has maintained a file on performance from many years past, but if it is brought out and referred to these days it would be by someone reaching way back for a comparison to a current manufactured Vette or performance car. I don't think anyone tests their own vehicles this way as few if any really want to know. I could tell you what I think my 63 340 hp will do, but then I'd probably be pulling your leg. One thing I know, with my car also having a 3.36, I sure wouldn't even try to do a 0-60 run, or quarter mile either. Perhaps your big block can light um up off the line, but my small block will fall flat on it's face. But try me from 30 on up and it's a different story.

    Good luck. I hope you get some input to satify your interest in this.

    Stu Fox

    Comment

    • Duke W.
      Beyond Control Poster
      • January 1, 1993
      • 15610

      #3
      Re: Performance numbers

      I can tell you what a 340 HP CR/3.08 axle will do - about 14.4 @ 102 MPH with exhaust cutouts. That's about what I could run at Puyallup (WA)back in the sixties. I just drove it off the line like leaving a stop light then floored the throttle. Any attempt at a "launch" just lite up the hard compound Michelins. I shifted halfway down and went through the lights in second at the redline. With a 4.11 it probably would have been in the high 13s with about the same trap speed.

      Regarding other typical engine-trans- axle combinations there are sites on the Web that have old Corvette road tests from the past. A 400 HP with the same transmission/axle runs about the same as a 390, and you should be able to find a representative test by googling.

      Test data from that era varied considerably due to the rather crude equipment - usually a "fifth wheel" setup, and different weather and traction conditions. Also, then an now, magazine tests start the clock the instant the car moves, so there is no staging effect/rollout like on a typical dragstrip. Also there are some slight differences in the way terminal speed is measured.

      You basically have to take everything with a grain of salt.

      Duke

      Comment

      • Don W.
        Expired
        • September 30, 1997
        • 492

        #4
        Re: Performance numbers

        Here's some data from old car articles:

        1969 Chevrolet Corvette Stingray
        Engine:
        390hp 427c.i V-8
        Transmission:
        Four Speed Manual
        Axle ratio:
        3.08:1
        Weight
        3,890
        Acceleration
        Sec.
        0-60 mph
        7.6
        Standing 1/4 mi.
        15.02@93.45 mph
        Source:
        Car Life 07/1969

        1969 Chevrolet Corvette Stingray
        Engine:
        430hp 427 c.i. V-8
        Transmission:
        Three Speed Automatic
        Axle ratio:
        3.36:1
        Weight
        3,710
        Acceleration
        Sec.
        0-60 mph
        6.8
        Standing 1/4 mi.
        14.10@106.99 mph
        Source:
        Car Life 07/1969

        Published Performance Numbers
        Acceleration
        300 hp, 3-sp automatic
        0-60 mph, sec
        8.4
        0-100 mph, sec
        21.7
        1/4-mile, sec @ mph
        NA

        Comment

        • Bill M.
          Extremely Frequent Poster
          • April 1, 1977
          • 1386

          #5
          Re: Performance numbers

          Car and Driver tested a '68 427/400 close-ratio 4-speed with a 3.70:1 axle and no A/C.

          0-60: 5.7 sec.
          1/4: 14.1 @ 102 mph

          I would expect your car to be close to these times on stock tires, no matter whether you have the close-ratio or wide-ratio 4-speed...

          The Pure Stock Muscle Car Drag Race runs old muscle cars on period correct tires. I am surprised at how fast they run on these tires, so there may not be a big difference due to modern tires. I ran a lot of bracket drag races with my '92 on modern street radial tires. I launched at 1800 rpm and the tires still spin a lot in 1st gear. The big difference is when you go to a drag radial; it is a dramatic difference. The tire will mostly influence the elapsed time. A rule of thumb is that a drag tire will drop the e.t. about a second.

          Top Speed: 119 mph @ 5600 rpm

          You should be able to pull 131 (119 X 3.7 / 3.36)

          Comment

          • Stanley H.
            Expired
            • September 30, 1988
            • 44

            #6
            Re: Performance numbers

            My 66 , L72 , short duration high lift- hyd extreme enrgy cam ..370 drag radials , stock side ex/no hedders best 13.06 @105 MPH........ there are several publications available that have the actual road tests of various corvettes done by auto magazines back in the day............. i will dig mine out & give you info..think brookland books has magazine info will get back to u

            Comment

            • John H.
              Beyond Control Poster
              • December 1, 1997
              • 16513

              #7
              Re: Performance numbers

              A friend's all-original dead-stock '71 LS-6/THM400 on stock tires has consistently run 12.10's @ 115 the last two years at the F.A.S.T. drags at Martin, Michigan; Saturday it ran 11.78 @ 116 in its last run prior to being "retired" in favor of a '69 L-88 for next year.

              Comment

              • Duke W.
                Beyond Control Poster
                • January 1, 1993
                • 15610

                #8
                Re: Performance numbers

                That's certainly quicker/faster than any magazine ever got out of a SHP big block configuration. The larger displacement of the LS6 was offset by the lower CR. It is still 9:1? Manfolds or header? Closed or open exhaust?

                The NCRS Spec Guide lists the LS6/TH400 standard axle ratio as 3.08 with 3.36 optional. What axle ratio is installed?

                NHRA "stock" classes allow considerable "blueprinting" and shorter than factory available axle ratios, which is how a "stock" NHRA DZ (302 Z-28)Camaro could run in the 12s, while a production DZ with the standard 3.77 axle was mid to high 14s, and IIRC one magazine couldn't even break into the 14s.

                Headers and open exhaust can also add substantial power to engines with high overlap cams, and in particular the DZ Camaro had a rather restictive exhaust system. The log manifolds and 2" pipes were considerably more restrictive than the Corvette exhaust system.

                Duke

                Comment

                • Stanley H.
                  Expired
                  • September 30, 1988
                  • 44

                  #9
                  Re: Performance numbers

                  Followup .I have two magazines one Road & Track On Corvette 1953-1967

                  the other Car & Driver On Corvette 1956-1967.............the both have over 100 pages on road tests done 1953/1967 .........available published by Brookland books & for approX 10 bucks each. Brookland books has a website to order from .........also several other books including Car & Driver on Corvette 1978-1982

                  good reading & info www.brooklandbooks.com

                  Comment

                  • Bill M.
                    Extremely Frequent Poster
                    • April 1, 1977
                    • 1386

                    #10
                    Re: Performance numbers

                    Originally posted by Duke Williams (22045)
                    That's certainly quicker/faster than any magazine ever got out of a SHP big block configuration. The larger displacement of the LS6 was offset by the lower CR. It is still 9:1? Manfolds or header? Closed or open exhaust?

                    The NCRS Spec Guide lists the LS6/TH400 standard axle ratio as 3.08 with 3.36 optional. What axle ratio is installed?

                    Duke
                    F.A.S.T. allows internal modifications as long as it is Factory Appearing Stock Tire. This is a good indication of what a stock tire can do.

                    The Pure Stock Muscle Car Drag Race must remain dead stock. These results indicate what these muscle cars can do when tweaked to the limit of stock parts.

                    There are websites for both groups.

                    Comment

                    • Stuart F.
                      Expired
                      • August 31, 1996
                      • 4676

                      #11
                      Re: Performance numbers

                      When you talk about F.A.S.T. (Factory Appearing Stock Tires) does that relate to just appearance or does it also mean the size? I wondered as back in the day we were allowed two (2) sizes over, so the typical tires circa 1961 were two sizes over Goodyear Double Eagles (14" wheels) on a 57 Chevy, which equated to my best time slip of 13.06 @ 106 MPH in B/Stock.

                      Stu Fox

                      Comment

                      • Bill M.
                        Extremely Frequent Poster
                        • April 1, 1977
                        • 1386

                        #12
                        Re: Performance numbers

                        Originally posted by Stuart Fox (28060)
                        When you talk about F.A.S.T. (Factory Appearing Stock Tires) does that relate to just appearance or does it also mean the size? I wondered as back in the day we were allowed two (2) sizes over, so the typical tires circa 1961 were two sizes over Goodyear Double Eagles (14" wheels) on a 57 Chevy, which equated to my best time slip of 13.06 @ 106 MPH in B/Stock.

                        Stu Fox
                        14.01Wheels must be correct*, including correct* diameter, width and material.

                        14.02 All 4 wheels and tires must be same size.

                        14.03 Original equipment reproduction bias-ply tires only. No soft compound tires of any kind are allowed. Retread tires are not allowed. Any car is allowed to upgrade to a maximum size tire of G-70 of the correct* wheel diameter. All cars that were originally available with a 60 series tire can upgrade to a maximum size of G-60 tire of the correct* wheel diameter.

                        Comment

                        • Joe C.
                          Expired
                          • August 31, 1999
                          • 4598

                          #13
                          Re: Performance numbers

                          Originally posted by Bill Mashinter (1350)
                          F.A.S.T. allows internal modifications as long as it is Factory Appearing Stock Tire. This is a good indication of what a stock tire can do.

                          The Pure Stock Muscle Car Drag Race must remain dead stock. These results indicate what these muscle cars can do when tweaked to the limit of stock parts.

                          There are websites for both groups.
                          Bill,

                          Huge difference between F.A.S.T. ("Factory appearing" division) and Pure Stock division. There are, AFAIK, at least three separate groups, nationwide (based on region, mostly) which sponsor variations of these 2 sub-classes. Naturally, there is a healthy dose of disagreement/rivalry between the three separate sanctioning bodies.

                          "Factory appearing" allows unlimited internal engine modifications, INCLUDING displacement changes (i.e: strokers) dramatic weight saving measures, and suspension mods which greatly enhance weight transfer to the rear wheels.

                          "Pure stock" allows "blueprinting" only. Very little internal mods are allowed. For example, head porting, intake/exhaust manifold porting, even pushrod guide plates are not allowed. How do they verify? Good question. Much "fibbing" occurs in "pure stock" class. The only "punishment" that I know of, is that if a pure stocker runs what is considered too fast, that car is "blacklisted" and no longer allowed to run as a "pure stocker".

                          Joe

                          Comment

                          • Bill M.
                            Extremely Frequent Poster
                            • April 1, 1977
                            • 1386

                            #14
                            Re: Performance numbers

                            Originally posted by Joe Ciaravino (32899)
                            Bill,

                            Huge difference between F.A.S.T. ("Factory appearing" division) and Pure Stock division. There are, AFAIK, at least three separate groups, nationwide (based on region, mostly) which sponsor variations of these 2 sub-classes. Naturally, there is a healthy dose of disagreement/rivalry between the three separate sanctioning bodies.

                            "Factory appearing" allows unlimited internal engine modifications, INCLUDING displacement changes (i.e: strokers) dramatic weight saving measures, and suspension mods which greatly enhance weight transfer to the rear wheels.

                            "Pure stock" allows "blueprinting" only. Very little internal mods are allowed. For example, head porting, intake/exhaust manifold porting, even pushrod guide plates are not allowed. How do they verify? Good question. Much "fibbing" occurs in "pure stock" class. The only "punishment" that I know of, is that if a pure stocker runs what is considered too fast, that car is "blacklisted" and no longer allowed to run as a "pure stocker".

                            Joe
                            Hi Joe

                            I should have posted links to these Michigan events.

                            www.fastraces.org

                            www.geocities.com/psmcdr

                            My post was in reference to the performance of the stock tires that these groups require. For example, a '69 L88 on stock tires ran 11.75@122 in 2005 at the PSMCDR. In 2005, C&D ran an '06 Z06 at 11.7@125 on the production tire. Both cars are high HP and very dependent on tire for their e.t. I was surprised at how fast the bias tires were. The cornering performance is not this close!

                            Bill

                            Comment

                            • Stuart F.
                              Expired
                              • August 31, 1996
                              • 4676

                              #15
                              Re: Performance numbers

                              I guess the stock class I ran back in the late 50's and early 60's would equate to "Pure Stock" now. We were, however, allowed .060" over bore, balance and blueprinting, but no porting/polishing of heads, etc. The method of enforcement was by "Protest". The opponent had to put up $25.00 for a tear down. I made it to near the end of the season before I got caught (so to speak). Everyone was cheating and we all knew each other, but once an outsider comes in all bets are off. With me we never got past the removal of the dual quad intake where my matched ports were questioned. I had sand blasted them to remove any grind marks, but they still looked too good a match with the intake gasket. What they never knew was I had a .030" reground off-center crank and special pistons to compensate at about 12 to 1 compression. I had my carbs stacked up 1-1/4" w/ cross cuts to eliminate the deficiency in the Corvette manifold to cylinders 2 and 6. On payoff runs (money) for top speed, I used a set of Caddy El Dorado WCFB quads w/1-1/8" Venturies (all 4) and both primaries linked together (2 stage progressive instead of 3) so we had the torque to start in 2nd gear instead of first. With this combo I could usually hit 108 or better mph, but the ET fell off a few tenths. I like to think we were some of the pioneers of weight transfer too. Had the rear way down and the front jacked up with worn out front shocks! All went well until the day I got protested we dropped the driveshaft out going thru the quarter (messy). That was the end of my season (and career) and I went in the Army shortly thereafter.

                              Stu Fox

                              Comment

                              Working...

                              Debug Information

                              Searching...Please wait.
                              An unexpected error was returned: 'Your submission could not be processed because you have logged in since the previous page was loaded.

                              Please push the back button and reload the previous window.'
                              An unexpected error was returned: 'Your submission could not be processed because the token has expired.

                              Please push the back button and reload the previous window.'
                              An internal error has occurred and the module cannot be displayed.
                              There are no results that meet this criteria.
                              Search Result for "|||"