AFR CYLINDER HEAD PROJECT

VHP WILL  ADHERE TO THE SAME STRINGENT PARAMETERS WE ALWAYS DO WHEN TESTING A PRODUCT OR SERIES OF PRODUCTS FOR ENDORSEMENT. FURTHERMORE, WE WILL ADHERE TO THE MANUFACTURER'S PRESCRIBED RECOMMENDATIONS, TO ENSURE THE INTEGRITY OF THE TESTS!

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JOHN BECKER 2003 C5 AUTO
PHOTOS BY GREG ALECK

DRAG STRIP RESULTS

TEST TRIM                             ELAPSED TIME

                                 60'        1/8MILE       1/4MILE           MPH

STOCK                 2.04             8.75            13.54            102.40

TEST 1                  1.96             8.38            12.96            107.41     
                                                                      
TEST 2                  1.86             8.10            12.57            110.61

TEST 3                  1.86             7.98            12.39            112.02

TEST 4                  1.92             7.95            12.31            113.10

TEST 5                  1.90             7.92            12.27            113.07

TEST 6                  1.90             7.92            12.27            113.07

TEST 7                  1.88             7.77            11.98            117.70  

< CLICK HERE TO VIEW ET SLIPS >

DYNO RESULTS

         RWHP             RWTQ            AT        AP         VP           ET          CF  



   S     279.3              298.5            82       29.9         .62         185          1.0

    1       318.8              335.8              85       30.2        .45          185           .99

    2       345.6              355.6              77       30.2        .43          185           .98

     3      353.2              360.7              79       30.1        .48          185           .99

     4     392.6               375.8              84       29.9        .68          185         1.01

     5    394.9                381.6              83       30.2        .38          185           .99

     6    403.4                 394.3             76       30.1        .19          185           .97

     7    391.6                 438.0             102     29.6       .63           185         1.04 

 

STOCK SPECS
ABSOLUTELY  NO  MODIFICATIONS MADE
THIS CAR HAS A STOCK TORQUE CONVERTER & 3:15 GEAR
 DRAG STRIP RUNS, FOR TESTS 1 THROUGH 3  WERE ON STOCK RUN FLAT TIRES.
WHEN TESTS 4 &  5 WERE MADE, THE INCREASED POWER AT THE SHIFT POINTS WAS SO EXTREME, THE CAR WAS VIRTUALLY UN-DRIVABLE, GETTING SO BENT OUT OF SHAPE JOHN ELECTED TO SWITCH TO A SET OF
295- 35- 18 GOODRICH DRAG RADIALS, THIS HURT THE 60' TIMES, BUT IT WAS STILL A WISE DECISION.

< CLICK ON A TEST TO VIEW GRAPH OF RESULTS >

TEST 1
INSTALL AFR 205cc MONGOOSE CYLINDER HEADS, 63cc CHAMBERS, .057 VICTOR / REINZS GASKETS
HEY GUYS! THIS IS A KICK ASS SET OF STREET HEADS!
TEST 2
INSTALL VARARAM COLD AIR INTAKE & BASSANI XHAUST 1&3/4 TRI-Y FULL STREET COMPETITION SYSTEM

TEST 3
DYNO TUNE WITH  VHP / CRANE CAMS HANDHELD TUNER

TEST 4
INSTALL COMP CAMS  581 / 581 / 220 / 224 /115 CAMSHAFT, SET 2deg ahead... WITH VHP 1.7 ROLLER ROCKERS
DYNO TUNE WITH VHP / CRANE CAMS HANDHELD TUNER

TEST 5
INSTALL VHP  "BOSS" 551 / 551 / 216 / 224 / 113 CAMSHAFT, SET straight up...
 VHP 1.8 ROLLER ROCKERS and VHP DUAL VALVE SPRING SET
DYNO TUNE WITH VHP / CRANE CAMS HANDHELD TUNER

COMPARISON OF TEST 4 AND TEST 5
COMP vs VHP

TEST 6
REPEAT DYNO TEST COMPARISONS OF TEST 4 AND TEST 5 WITH YANK "TRANNY TRICKER"
TO LOCK TRANSMISSION  IN 3RD GEAR. THIS GIVES MUCH BETTER TORQUE COMPARISONS
IN THE LOWER RPM RANGE. THIS IS THE STREET DRIVING RANGE.

 TEST 7
INSTALL VHP PUNISHER TORQUE CONVERTER AND 3:73 DIFFERENTIAL
 

"DYNO RESULT ABBREVIATIONS"
    AMBIENT TEMPERATURE             AT 
    ATMOSPHERIC PRESSURE            AP
   VAPOR PRESSURE                            VP
   ENGINE TEMPERATURE                 ET
                 CORRECTION FACTOR                    CF  in SAE!
           REAR WHEEL HORSE POWER      RWHP
           REAR WHEEL TORQUE                  RWTQ

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