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Old 01-27-2012, 12:39 AM
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Top speed trouble

So this might be the stupidest question, but I'm baffled as to how to get to 150mph or so in my car. I'm running a 71 Monte, with a 490 or so horse stroker motor, a built 200-r4, and a 4.11 rearend. Is it all in the way the tranny is built that determines my speed, or what is the deal? I can't seem to break 115-120 mph. I sure get there in a hurry, but I know for fact my motor can take my car way past that if it had the right setup.

How is this done?

Again, I apologize for the potentially stupid question.

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Old 01-27-2012, 02:20 AM
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Not a stupid question....but my question is WHERE are you doing this kind of speed? If it's on the highway or if you're a street racer then I'm done. But you have to remember that it takes a LOT...and I mean LOT of HP to push a car with no real aerodynamics past 130 or so mph.
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Old 01-27-2012, 02:49 PM
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I do most of my little engine modification/tests on the Kearney Raceway Park drag strip in Kearney NE. It's much easier to get dates to go out and get something done in the winter time, especially with the 50-65 degree weather we've been having lately.

But is it really that simple? Is it all a matter of aerodynamics, or is there something more that I'm forgetting? Might possibly a taller gear ratio help?
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Old 01-27-2012, 04:58 PM
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Ok, you say "490 or so horse stroker motor" ....how do you really know? Not doubting you but a lot of guys waaaay over estimate their engines hp based on what they read in the mags. Only way to reall tell is put it on a chassis dyno...you'll be surprised. That Monte Carlo is a big heavy car and again takes a lot of hp to make it accelerate, MHO but you'll never see 150 unless you REALLY take a lot of weight out of the car and add a blower, turbo or a huge shot of nitrous. Is the engine a small or big block?
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Old 01-27-2012, 05:02 PM
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Top speed is a function of horsepower, tire diameter, and gear ratio. If you're wanting to do 150 in the quarter, I'm afraid you'll need way more power if your talking about the car in your pic. If you're talking about total top speed then change your gear ratio to something around 3:23 and that should help. It will cut down on your acceleration but will add to your top end. But don't try that on a public road. Other than being dangerous, its stupid and just a bit illegal. A ticket at that speed won't be just a fine... it will be serious jail time. Criminal speed is no joke.

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Old 01-28-2012, 03:25 PM
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Aside from the question of the legailty of the situation, the next most important question is whether or not this is in a 1/4 mile or just flat out top speed?
What RPM is the engine reaching when the car maxes out?
What is your tire size?
Exactly what engine do you have?

As previously mentioned the gearing and tire size alone could very well keep you from getting close to that speed.
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Old 01-28-2012, 03:42 PM
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If you are doing 125-130 in the 1/4 mile, you are doing pretty darn good with that car.....Sorry, but I have doubts that you are doing it in the 1/4...... maybe on a running mile....
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Old 01-28-2012, 04:27 PM
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Quote:
Originally Posted by poncho62
If you are doing 125-130 in the 1/4 mile, you are doing pretty darn good with that car.....Sorry, but I have doubts that you are doing it in the 1/4...... maybe on a running mile....
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Old 01-30-2012, 07:55 AM
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With the 2004R's .67 4th gear the 4.11 rear ratio would be 2.75 ratio.
Good calculator >> http://www.f-body.org/gears/ just use 6500 redline etc..

2004R Ratios:
1st = 2.74
2nd = 1.57
3rd = 1.0
4th = .67

157mph @5200rpm w/28" Tire.
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