Top Speed with a KB 2.1

TheDukeOfEarl · Aug 18, 2009

I always get a kick out of the 1/4 mile guys. You hit 120/130 and freak. I enter turn one at Cal speedway at 155 and sustain 145 through turn one and two. Turn 8 at Willow springs is a sustained 140. A pebble at 130 does not put you in the ditch. In stock form the SN95 does generate quite a bit of lift over 120. somewhere in the 300 lb range. Add in a front splitter, Rear wing and a defuser and the cars are good to 200+. Granted you need 600+ HP to get 200+ but the cars will do it. Just never do it on the street or highway. Always run on a closed corse with all the safety equipement.

Stan Weiss · Aug 18, 2009

You can see where at about 5230 RPM it takes more force to push the vehicle than is available at the wheel.

Code:

                Acceleration and Top Speed Prediction Chart.

                                   Force    Aero     Rolling  Elapsed           Accele
  RPM      MPH   Velocity  Motor     @     dynamic   Resist.   Time      Total  ration
                  ft/sec  Torque   Wheel  Drag - HP    HP      (ET)    Distance in G's

>>>>--- Gear Change 5
 4154.3  127.05  186.344   472.7   566.2   108.062   18.804  23.8291  2962.658    .052
 4200.0  128.45  188.396   475.0   568.9   111.672   19.011  25.0751  3196.136    .051
 4250.8  130.00  190.672   477.5   571.9   115.769   19.241  26.4919  3464.659    .049
 4300.0  131.51  192.882   480.0   574.9   119.840   19.463  27.9039  3735.457    .048
 4400.0  134.57  197.367   485.0   580.9   128.397   19.916  30.8953  4319.222    .045
 4414.3  135.00  198.006   485.7   581.7   129.648   19.981  31.3363  4406.407    .045
 4500.0  137.63  201.853   490.0   586.9   137.352   20.369  34.0765  4954.306    .042
 4547.5  139.08  203.983   489.1   585.7   141.747   20.584  35.6848  5280.670    .040
 4577.8  140.00  205.340   488.4   585.0   144.595   20.721  36.7616  5501.046    .038
 4600.0  140.69  206.338   488.0   584.5   146.713   20.821  37.5822  5669.972    .037
 4700.0  143.74  210.824   486.0   582.1   156.491   21.274  41.6218  6512.777    .032
 4741.3  145.01  212.674   485.2   581.1   160.648   21.461  43.4885    1.3084    .030
 4774.0  146.01  214.143   484.5   580.3   164.000   21.609  45.0729    1.3724    .028
 4800.0  146.80  215.310   484.0   579.7   166.694   21.727  46.4040    1.4265    .027
 4806.5  147.00  215.601   483.9   579.5   167.372   21.756  46.7479    1.4406    .026
 4839.3  148.00  217.070   483.2   578.7   170.817   21.904  48.5546    1.5146    .024
 4872.0  149.00  218.539   482.6   578.0   174.308   22.053  50.4997    1.5948    .023
 4900.0  149.86  219.795   482.0   577.3   177.331   22.179  52.2902    1.6692    .021
 4904.8  150.01  220.008   481.9   577.2   177.847   22.201  52.6070    1.6823    .021
 4937.5  151.01  221.477   481.3   576.4   181.434   22.349  54.9074    1.7785    .019
 4970.0  152.00  222.935   480.6   575.6   185.040   22.496  57.4211    1.8843    .017
 5000.0  152.92  224.281   480.0   574.9   188.411   22.632  59.9915    1.9932    .015
 5002.0  152.98  224.371   479.9   574.8   188.637   22.641  60.1729    2.0009    .015
 5002.8  153.00  224.404   479.8   574.7   188.722   22.644  60.2413    2.0038    .015
 5035.5  154.00  225.873   477.9   572.3   192.453   22.793  63.4842    2.1421    .013
 5068.3  155.01  227.342   475.9   570.0   196.232   22.941  67.3572    2.3083    .011
 5100.0  155.98  228.766   474.0   567.7   199.943   23.085  72.0054    2.5091    .008
 5100.8  156.00  228.800   474.0   567.7   200.032   23.088  72.1295    2.5145    .008
 5133.5  157.00  230.269   472.0   565.3   203.909   23.236  78.4874    2.7909    .006
 5152.3  157.58  231.110   470.9   564.0   206.152   23.321  83.3317    3.0026    .005
 5166.3  158.00  231.738   470.0   562.9   207.837   23.384  87.9318    3.2042    .004
 5198.3  158.98  233.174   468.1   560.6   211.723   23.529 106.1208    4.0054    .001
 5199.0  159.00  233.207   468.1   560.6   211.815   23.533 106.8372    4.0370    .001
 5200.0  159.04  233.252   468.0   560.5   211.937   23.537 107.8352    4.0811    .001
 5212.8  159.43  233.824   467.2   559.6   213.500   23.595 129.4093    5.0356    .000
 5217.3  159.56  234.026   467.0   559.3   214.053   23.615 153.8252    6.1174    .000
 5218.5  159.60  234.082   466.9   559.2   214.207   23.621 176.8488    7.1380    .000
 5219.0  159.62  234.104   466.9   559.2   214.268   23.623 216.7288    8.9061    .000
 5231.8  160.01  234.676   466.1   558.2   215.843   23.681
 5264.3  161.00  236.134   464.1   555.9   219.890   23.828
 5297.0  162.00  237.603   462.2   553.6   224.020   23.976
 5300.0  162.09  237.738   462.0   553.3   224.401   23.990

Gearbanger 101 · Aug 19, 2009

mustanggt04fast said:
ive put my gt with out a supercharger to 170 and still had plenty to go in 5th gear on a closed road

170mph in a basically stock horsepower car....not unless you were being pushed by a Z06 after 140mph!

Winters98GT · Aug 19, 2009

Gearbanger 101 said:
170mph in a basically stock horsepower car....not unless you were being pushed by a Z06 after 140mph!

must have been me

my car doesn't do much more than 175-180, so this is impossible, and I have topped out a PI 2v car, or two, over the years. The stock speedo is not that accurate, and you can't get anywhere near that with 240-270rwhp.

san~man · Aug 19, 2009

mustanggt04fast said:
ive put my gt with out a supercharger to 170 and still had plenty to go in 5th gear on a closed road and with just the suspension kit that i had it did not vibrate or shake or in this case try to fly it was smooth as if i was just doing 65 mph on the highway

Did you forget to recal your speedo or something?

There is no way in hell you hit 170, n/a, especially in a brick-of-a-car-called-a-Mustang. Don't get me wrong, but it isn't like a Mustang is the most aerodynamically designed car. I did 145 in my car, full bolt ons (no cams), and it was getting spooky at that point. To tell me you did 25mph more calls for the

Winters' Vette barely gets that high, and his car is superior to the Mustang in every away (power/weight, aero, etc).

40oz · Aug 19, 2009

some of you are funny. I've had mine up to 150mph on several occasions, all in the middle of the night on a clear freeway with no entrances for miles and miles. And up to 130-ish on a road course several times. That's bone stock except for tires. The car was fine. In fact, the faster I went, the more stable it felt. No supercharger, so can't help the OP.

If your car feels unsafe over 100, then by all means don't go that fast before you get it fixed. If the car feels fine but you get scared, then don't go that fast yourself. It's a rational fear. The fear is mostly unwarranted, but bad things happen quick at that speed. Some of us regularly drive 80-90 mph just getting to work in traffic (Chicagoland commute) and that's surrounded by cars going the same speed. 130mph blasts on an open freeway late at night is arguably safer for all involved

Consider the mass of the better part of two tons barrelling down a road. In order to "toss it in the ditch," you'd have to have a force capable of affecting that almost two tons. Inertia laughs at a little rock in the road given the kind of force being applied at that speed. Mass times velocity says that rock had better be pretty damn big before it's going to make a damn bit of difference in the trajectory of the car.

Alfredo E · Aug 19, 2009

Thanks for your opinions, I respect ‘em, but I don’t agree with all of them (i.e. “…top speed is a childhood stat, something that matters when you don't know a lot about cars…”. I respect it, anyway).

I run the car in 2001 (with aprox. 10.000 miles in the odometer, totally stock, except for a K&N air filter) at 154 mph GPS measured, in a clear winter morning, clear freeway with no entrances, for about 5 miles. The car was fine and easy to drive in that conditions.
Recently, I was invited to turn in a local speedway, and the Mustang (supercharged) was fine too, but I didn’t run over 150 mph at anytime.

If I would suppose that I can go faster than 150mph safely, with stock tires, no chassis, brake or suspension mods… I just push gas pedal and see what happens…. But I don’t have suicidal tendencies.

Now, I only wanted to know, if somebody hit top speed with a supercharged 4.6 (or other mods that give 400+ hp). I guess that other parts wouldn’t be bone stock.

Thanks again for all of you guys!!!

PD: excuse me for my English, it isn’t very good.

Gearbanger 101 · Aug 19, 2009

Thinks to consider...you didn't specify whether it was the KB base kit (which is non intercooled and rated at considerably less horsepower), or their intercooled kit (which even though advertised at 400hp, generally makes closer to 370-380hp). This is of course if you're talking wheel horsepower?

One thing to consider with a Twin Screw, or any positive displacement type blower is heat. Even intercooled, you won't be able to sustain top speed power levels for more than a few seconds before ACT's climb and the computer as a result pulls timing and horsepower drops.

In any case....pushing a Mustang to 170+ with 400rwhp on tap seems to be quite doable. Generally though, after about 170mph, the limits of the Mustangs aerodynamic design are tested and its higher drag coefficient is going to require considerably more power to reach higher speeds.

tag4car · Aug 20, 2009

Gearbanger 101 said:
Thinks to consider...

In any case....pushing a Mustang to 170+ with 400rwhp on tap seems to be quite doable. Generally though, after about 170mph, the limits of the Mustangs aerodynamic design are tested and its higher drag coefficient is going to require considerably more power to reach higher speeds.

True words Brian. if we wanted to really get this going we should compare the gt500 to the FGT, Power/weight/aero

mustanggt04fast · Aug 20, 2009

i dont know why guys are scared to go over 100mph all im saying is im not scared to push my car to the limit of what it can do my speedometer goes to 155mph and i have had it pegged out and only at 4500rpms in 5th gear (and yes the speedo was recalibrated) and i keep pushing the car call me crazy or say i have a death wish but im not scared to drive fast and i was clocked at 167mph with a radar gun and was at 5700rpms i tak out at 6000rpms. im not arguing with any body but that is what the gun said so that is what ive done in my car

blubullett · Aug 20, 2009

mustanggt04fast said:
ive put my gt with out a supercharger to 170 and still had plenty to go in 5th gear on a closed road and with just the suspension kit that i had it did not vibrate or shake or in this case try to fly it was smooth as if i was just doing 65 mph on the highway

BS. 170 mph with 3.73s? I don't know the math but I don't think that is possible. Even if it is stock mustangs top out around 150. Sorry man. Everyone here owns mustangs, there is no need to lie to us. Didn't the 385hp Cobra R top out around 175 with 100 more hp then a GT and the areo aids.

crazystang25 · Aug 20, 2009

comporange04GT said:
+1
Silver State Challenge, Salt Flats, Dry Lake..........

texas mile as well. i believe thats what they call it.

Stan Weiss · Aug 20, 2009

blubullett said:
BS. 170 mph with 3.73s? I don't know the math but I don't think that is possible. Even if it is stock mustangs top out around 150. Sorry man. Everyone here owns mustangs, there is no need to lie to us. Didn't the 385hp Cobra R top out around 175 with 100 more hp then a GT and the areo aids.

Having the RPM and having the HP or 2 different things.
Stan

MPH = 170
Rear = 3.73:1
Tire Diameter = 25.68 (245-45-17)
Trans Gear Ratio (manual 5th ) 0.67:1

RPM=5559

Calculate RPM for given Speed(MPH), Rear Gear Ratio and Trans Gear Ratio
Automotive Performance Software / Interactive JavaScripts Calculators

Winters98GT · Aug 20, 2009

crazystang25 said:
texas mile as well. i believe thats what they call it.

The texas mile is completely different. It's really cool, but you need 600-700hp to hit 170-175, if not more, in the texas mile in a stang.

tag4car · Aug 21, 2009

mustanggt04fast said:
and i was clocked at 167mph with a radar gun and was at 5700rpms

you should be going 174.32 mph with some math figures, You might need to clean the airfilter up real nice

Stan Weiss' - Automotive Performance Software / Interactive JavaScript to Calculate Speed(MPH) for given RPM, Rear Gear Ratio and Trans Gear Ratio

tire size 25.68
trans gear 0.67:1

san~man · Aug 21, 2009

mustanggt04fast said:
i dont know why guys are scared to go over 100mph all im saying is im not scared to push my car to the limit of what it can do my speedometer goes to 155mph and i have had it pegged out and only at 4500rpms in 5th gear (and yes the speedo was recalibrated) and i keep pushing the car call me crazy or say i have a death wish but im not scared to drive fast and i was clocked at 167mph with a radar gun and was at 5700rpms i tak out at 6000rpms. im not arguing with any body but that is what the gun said so that is what ive done in my car

Again, BS. Unless your car was dropped from a C130, going down a mountain, or fell off a cliff, no one believes you.

Winters98GT · Aug 21, 2009

mustanggt04fast said:
i dont know why guys are scared to go over 100mph all im saying is im not scared to push my car to the limit of what it can do my speedometer goes to 155mph and i have had it pegged out and only at 4500rpms in 5th gear (and yes the speedo was recalibrated) and i keep pushing the car call me crazy or say i have a death wish but im not scared to drive fast and i was clocked at 167mph with a radar gun and was at 5700rpms i tak out at 6000rpms. im not arguing with any body but that is what the gun said so that is what ive done in my car

you would be in jail and your car would be impounded. Newb.

KBExperience · Aug 21, 2009

Winters98GT said:
you would be in jail and your car would be impounded. Newb.

++++1:Track:

crazystang25 · Aug 21, 2009

Winters98GT said:
The texas mile is completely different. It's really cool, but you need 600-700hp to hit 170-175, if not more, in the texas mile in a stang.

ya i was just using this event as an example.

Stan Weiss · Aug 21, 2009

mustanggt04fast said:
i dont know why guys are scared to go over 100mph all im saying is im not scared to push my car to the limit of what it can do my speedometer goes to 155mph and i have had it pegged out and only at 4500rpms in 5th gear (and yes the speedo was recalibrated) and i keep pushing the car call me crazy or say i have a death wish but im not scared to drive fast and i was clocked at 167mph with a radar gun and was at 5700rpms i tak out at 6000rpms. im not arguing with any body but that is what the gun said so that is what ive done in my car

Never going to happen. Does not add up.

Stock tires with 3.73:1 4500 RPM = 137-138 MPH

Stock tires with 3.27:1 4500 RPM = 157 MPH

Stock tires with 3.73:1 5460 RPM = 167 MPH

Stan

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