I would have to see where his dyno peaks, but I know he will be over 200mph..

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by VINCE:
<strong>My car feels fine above 170mph. I am getting revalved bilsteins when my car comes back.. 500rwhp should be well over 200mph.. I am thinking somewhere around 220mph with 3.42's.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I don't know about well over 200mph.

 

][/QUOTE]

I don't know if it is true, but i saw somewhere that after 160 mph it takes 20 hp to gain 1 mph.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Rpm2800:
<strong>]</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I don't know if it is true, but i saw somewhere that after 160 mph it takes 20 hp to gain 1 mph.</strong>[/QUOTE]
That's got to be wrong, think about it Viper GTS' run 192 mph stock making 450-460 hp - Ferrari 550 also 194 mph stock making 475 hp but about 400 lbs heavier then the Viper.

 

Viper and that Ferrari has different gearing. You have to look at where the peak power is made as well.. Some people make it seem like 200mph is hard to get. Lingenfelter has been doing that for a while now on H/C Vettes making less horsepower. One of Lingenfelters H/C LT1 Formulas making around 400rwhp ran over 180mph. I do not see why some think that a car making 100rwhp more cant run 200mph.. Lamborghinis making 550 flywheel horsepower are running over 200mph. 500rwhp should be able to do that with ease..

 

I did fuel cutoff with 3.73 gears and standard tire size with the 385 I had last year, and the 422ci I have now has a lot more oomph. Fuel cutoff was about 6700 RPM. I figure it was in the 180mph range, maybe more, and it would have gone faster, no problem.

 

Just run it and find out! And videotape it too. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

 

200 mph should be a peice of cake with 500 rwhp and 3:42's. I have been ~170 or so with a stock internal motor and 3:42's. A buddy of mine was right behind me in a 99 C5, and his speedo showed 175 before we shut it down.

Josh

 

The Viper has a T-56 with the same gearing as our F-bodies, however, it has a 3.07 gear - but they don't rev high. I believe they make peak hp around 5,600-5,800 rpm. Lingenfelter had a 383 LT1 Firebird that made 450 hp run 192 mph with 3.23 gears.

 

You are right Leo.. Thats 450 flywheel horsepower. Thats less than 400rwhp..

 

Some might enjoy these numbers. Here is how much HP it will require for you to obtain some of the high speeds discussed.

F Body:
Drag: .34
Frontal Area: ~22ft

MPH HP

170 313
175 339
180 367
185 397
190 427
195 460
200 494
205 530
210 567
215 606 and for all you crazies <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
220 647
225 690

After this, the HP curve heads north pretty quickly.
This is just a wind drag calc. Naturally, there are some other factors that come into play, but this should give you a rough estimate.

 

[/QB][/QUOTE]

Can you fairly compare a 4th gen camaro body to a C4 , C5 , or 3rd gen Trans Am in top speed test.


How much of a difference would this make. Just wondering.

I saw an lt1 z28 run i think 209. I think it had over 600 at the wheels.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by NoGo:
<strong>Some might enjoy these numbers. Here is how much HP it will require for you to obtain some of the high speeds discussed.

F Body:
Drag: .34
Frontal Area: ~22ft

MPH HP

170 313
175 339
180 367
185 397
190 427
195 460
200 494
205 530
210 567
215 606 and for all you crazies <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
220 647
225 690

After this, the HP curve heads north pretty quickly.
This is just a wind drag calc. Naturally, there are some other factors that come into play, but this should give you a rough estimate.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Which fbody, and which gen is this for. I know the Trans AMs have a bit of an areo advantage. For instance the Lt1 six speed z28 ran 154, and the Trans Am ran 157.

Also i saw something talking about land speed cars . I think they were saying the 3rd gen Trans Am body was a good choice for top speed.

 

Nogo's #'s have to be horsepower at the engine. I know I was going close to 190mph secondary to this bike behind me going 184mph and I was still pulling in my old setup.. A 422ci with 500rwhp would easily do 200 plus mph.

 

I believe the older gen F-bods had a better coefficient of drag, .32 I believe I have read.

I used the coefficient of drag for a 4rth gen camaro. I dug this up on the internet somewhere, so we all know this is stone reliable <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" />

The numbers above are BENCH RACING numbers. There are going to be a lot of other factors that are going to come into play at this high of speeds. The Drag Constant makes a BIG difference at high speeds, so it is not fair to compare two different chasis with similar HP for top speed runs

Vince, as for you doing 190+ and still pulling, I am little skeptical. First, for your gearing, you would have to have peak torque over 6300 rpm (possible). Second, given the HP and Torque you listed you would have to have a drag coeficient of about .28, which is well into "race-car" territory. I am assuming that you have done no modifications to your car to significantly change the frontal area (cut off your mirrors?).
This, however, is just my humble opinion.

If anybody is curious to know what the drag constant (drag*frontal) of our cars really is, here is an experiment for all the crazies.

First we need a recent dyno pull.
Next, get on the freeway, put the car in 6th and take it up to its maximum speed. It should become drag limited somewhere at 130+ (I said for the crazies). Note what RPM/speed this happened at. Figure what HP/Torque you had at the RW (according to your dyno pull) for the RPM that you were at.

Send me your RPM, speed, HP / Torque, and I should be able to give out the Drag Constant for your car.

Until then, happy bench racing. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

NoGo I am not going to turn this into a debate. I have no reason to LIE! I said around 190mph and not 190 plus.. I just want to make that clear. My car is also lowered and that also helps with high speed passes. You mentioned you used the f-body dimensions. Remember the pre-98 f-bodies drag co-efficient is different than the new ones. Ours should be lower. Plus, my horsepower #'s were closer to 400rwhp, but I live in Florida and it was always hot when I did my dyno runs. Like 90 plus degrees. At night is when I do my high speed testing and tuning and that 185mph plus run was done during 60 degree weather.. I have all of BMR suspension except his sway bars which are going on this summer. I know my tach was on 6300rpm and still going north. My peak horsepower was at 6400rpm with my T1. I am not saying my car was reving up like it was in 1st. I was in 5th. The only reason I slowed down was because I was running out of road.

 

As stated, merely my humble opinion.

<img border="0" alt="[fight]" title="" src="graemlins/gr_punch.gif" />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by NoGo:
<strong>
Send me your RPM, speed, HP / Torque, and I should be able to give out the Drag Constant for your car.

Until then, happy bench racing. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">From what I understand, your top speed is reached when your positive force vectors (in this case, only the force applied by the rear wheels against the ground to propel the car forward) are equal in magnitude but opposite in direction to the non-conservative forces comprised of both drag and frictional components. From this assumption, you would also need to know the coeffecient of rolling friction between the tires and the road surface as well as tire size and weight of the car to figure out the drag coeffecient of the car. Figuring out top speed is very similar to calculating gas milage. In a milage scenario, your fuel consumption is determined by the amount of power it takes to overcome frictional forces in the motor and drivetrain, friction between the tire and road surface, and of course drag forces...

 

Nick stop cutting and pasting stuff off the internet to sound important.. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by LEO:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Rpm2800:
<strong>]</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I don't know if it is true, but i saw somewhere that after 160 mph it takes 20 hp to gain 1 mph.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That's got to be wrong, think about it Viper GTS' run 192 mph stock making 450-460 hp - Ferrari 550 also 194 mph stock making 475 hp but about 400 lbs heavier then the Viper.</strong>[/QUOTE]

It does not seem to add up to me , but i saw it somewhere a few years back . I am not sure what kind of car they were stating this for, but I think it was a Monter Carlo (brick) . Still i don't know if it's true . Just something i saw.