Mustangs in stock form have absolutely no business traveling these speeds.

 

Where in the World will you be going 200mph anyway?... Good God.. Thats insane to think about on public roads.. Ok next idiot question.. Assuming we have a 2.08:1 axle ratio and a .039 overdrive ratio.. Can we reach 300mph if we have 2007 rwhp?... How will the car handle at this speed? What will my gas mileage be on a trip at this speed?

 

4 gallons per mile

 

people keep saying weight has to do with top speed... it doesn't.
Weight changes how long it takes you to accelerate, but all cars will eventually get to a same top speed with the same hp, aerodynamics, and gearing... no matter how much they weigh.


people keep saying its torque, im not arguing with the fact that torque isnt important, but torque is only part of the equation that gets you to HP (which is really what you are after), so if you go into an engine shop asking for torque, they will do things that focus on torque instead of HP, HP is a package deal, lots of variables, rpms, forced induction, boring of motor, compression... its not just as simple as asking for more torque.... which is why i continue to stand my ground on HP.

Its these false concepts that are making a very simple topic very confusing. Weight doesnt matter... Rear wheel HP does, wind resistance does, front wheel bearings do, gearing does. THE END.

Quit adding variables like driver's weight and other things trying to be smart. The list above is everything you need to get to a top speed. Nothing else influences top speed.

 

I'm not saying hp doesn't matter either, but for the question at hand, with stock gearing (the original question simply asked how much hp it takes to get an MN6 going 200mph) it's easiest to look at torque... Here's my hypothesis on it:

The answer to the question can be found simply by figuring what rpm 5th gear is in at 200mph, and how much torque is required to juuuuuust compensate for the wind resistance (we are talking torque to the ground through the multiplication factor of 5th gear and the stock 3.42 rear end). You can then create a theoretical torque curve that would match that scenario, and use that curve to plot a hp curve to find the peak hp for that car. This will give you an idea of how much hp you need to go 200mph.

The spreadsheet I have nails the C6 Z06 to 195mph, which is pretty darned close to true life. All it takes is changing out the torque curve on the spreadsheet to change the top end results... Of course that changes the peak hp, so of course I'm not saying that hp doesn't matter.

 

I really wasn't going to respond, but I just can't resist.

Well, that car with 100 hp, would also have that much less torque, woudn't it? Do you just want to argue for argument's sake? Now, about the vaccum comment, see your weight comment below.

Actually, that would be pretty cool! I did engineer a craft that when first tested, the local police received over 400 complaints about a UFO. When we crashed it, there were locals picking over the bones looking for aliens. Some ran when we got there, thought were were "men in black" or something. Pretty funny when I look back on it. But damn, I should have added some C4 cues to it (pre C5).

I agree, very well said

Now you didn't just say that.....Did you. Show me any way to mod an engine that increases hp without a corresponding increase in torque?



Wait, back so soon. The only way to increase hp is to increase torque or increase the rpm's. And since you can't wind the LS1 (that the engine with the 5.7 on it measured in liters) to 12K rpm, were right back to torque. Yes, the rev limit can be modified up ~500rpms, and you (without changing anything else) get more hp. However, when calculating this on a spreadsheet, you just adjust all the rpm ranges up and leave the torque curve the same. Other than that, any mod that changes hp, will also change the torque.

Not to start another flame war, but since you wanted to flex your internet muscle about the vaccuum comment, you are wrong here. All else equal, a heavier car will have more rolling resistance than a lighter one. Friction is related to the weight and coefficient of friction. And with more friction, it will require more power to get to top speed. At 200 mph, rolling resistance is a pretty big factor.

Thank you, that was my original point. One, which apparently, I didn't conveigh very well.

 

Back on topic, what I have estimated, is that a car with ~550rwt (or ~600rwhp) should be able to get to 200 with no problem, with standard 3.42 rear gearing.

 

I get my bolt on, mild cam up to 200mph all the time... heck i've barried the needle so i really have no idea how fast i'm going after that point...

I make a little under 400 at the wheels with stock tranny and gears in my 98 coupe... When ever i want to go really fast (200+) i push the extream machine button located on the right side of my speedo. It's right above the reset button... holy cow when you push it you just watch the needle scream forward and it's such a nice feature there is no weird jerk like youd expect from a power increase like that. I"m sure GM designed it that way for a reason... that much power increase at those speeds and a huge jerk could end alot of lives. It's probably like those new transmission that dont' have shift shock.. So i guess power shock????

I don't get why everyone thinks you need like 650hp and gears to get there... its' all at the touch of a button...

 

I like it! I'm going to go cancel my superduper Lingenfelter package order, what a waste of daddy's money!



Dope

 

174 for the coupe
172 for the vert.

I believe.

 

... more than a few here are "thinking backwards".

Because torque is a measure of a twisting force, and HP is a measure of work (ie, twisting force x velocity).

HP can NOT be defined without this relationship ... HP = (T x RPM)/5252.

If you have a torque T (even if was 5000 ft-lbs) without any RPM, the HP = ZERO !! ... and your car doesn't move.

... if you have the same torque at a higher RPM then you have more HP (doing more work with same amount of force), which will move a vehicle faster down the road. Ultimately, it's HP and gearing that determines how fast a vehicle moves down the road. Torque is just a part of HP, per the equation that defines HP (defined by Mr. Watt in the 1800s)

The same car with "engine A" that puts out 300 ft-lbs of T at a redline of 5000 RPMs will NOT go faster than the same car with "engine B" that puts out 300 ft-lbs of T at a redline of 8000 RPMs ... no matter how it's geared with “engine A”.

 

I still want to see the GT hit 201 with 4.10 any way!

 

Actually this horsepower/torque debate can go either way since they are both related to each other with rpms being the deciding factor.

You could theroretically put a twin turbo diesel engine in a vette (I know) , that has ONLY 325 rwhp and 600 ft lb of torque and still do 200 mph. You would just have to waaaaay overdrive the transmission with a gear tall enough to make max tourqe and not break the transmission gear. And you would only be turning maybe 3000 rpms while doing it.

 

[QUOTE=N0TDADYS_98;1560687267]I get my bolt on, mild cam up to 200mph all the time... heck i've barried the needle so i really have no idea how fast i'm going after that point...

I make a little under 400 at the wheels with stock tranny and gears in my 98 coupe... When ever i want to go really fast (200+) i push the extream machine button located on the right side of my speedo. It's right above the reset button...[QUOTE]


I agree with this, if you look back at my original post, it said all you need is 400-450 rwhp. Then the nasa boys with spreadsheets factoring in weight and torque showed up, when all you have to look at is HP and resistance.

 

I completely agree, and never have disagreed. However, the context of the post is what mods are needed to a C5 vette to get to 200mph. So your not going to be able to change the rev range too much. Guess what's left?

 

I saw a new ZO6 with 515 RWHP break 200mph last weekend. The driver said there was more to go. I'm not sure what mods he did to get the extra 40-50 hp, but I saw it and so did the CHP(california highway patrol). Luckily by the time he got radared and the chipper got after him, he was written up at 98.

 

Hey zee0six... it was sarcasm, read the whole thread. I was making fun of the people saying we should focus on torque and not hp. They think human beings and engine builders alike are retarded, they think you have to ask for torque and not hp when you modify your motor.... and instead of staying on topic of what "hp does it take to hit 200", they tried to sound intelligent, and inform us that hp is a unit derived from torque.... complicating or over simplifying things to the point of ignorance. The question is easily answered, no spreadsheets are needed, we just need someone to go max out their car and be honest what hp they have and what speed they got to, and how much their car has been lowered.... the rest are all constant variables among all c5 owners. Ive been over 200, but i have more than enough power to get there... so what we need are people who have exactly enough to get there and not an ounce more... i still think it takes 400-450 at the wheels, and so far we have one person who says hes hit 200, and has that range of hp... I dont trust spreadsheets from people who want to get obsessive about weight and say that 6th gear wil break and is useless at those power levels... obviously they havent been 200, 6th gear doesnt break, and 6th gear does continue to pull and accelerate.

 

zee0six... were in agreance, youre about the only person on my side who realizes how stupid this whole torque convo is. The sky is blue guys, the sky is blue. Just thought id throw that out, i know were trying to figure out hp and top speeds, but dont you think the color of the sky might affect hp?

WHO HERE DOESNT KNOW THAT YOU CANT INCREASE THE RPMS OF A VETTE TO 12k? DUH.

We know that as we increase hp we are increasing torque... but who is the mental midget who has to think of it all in terms of torque instead of walking into any shop and asking for more hp? My point is, asking for torque alone does not always get you more hp bc there can be nagative tradeoffs to pursuing only torque, there are ways to gain torque that prohibit high rpms and generate negative hp tradeoffs. Therefore talking about torque and torque alone is pure ignorance. Its hp. If you want to talk about torque and torque alone, go start your own thread. "What torque does it take to get to 200" The guy who started this one was smart enough to know its about HP, and that the unit of hp is a unit that comes in handy when you dont want to do spreadsheets and math equations galore.

 

something else that ive been waiting for to come up, but i didnt want to comment bc i dont know the exact cutoffs on exact modles... but im pretty sure all vettes have computer governers... i know the stock c5 cuts out at 172. I know the 2001 c5 z06 does at 186. So if this 190 mph gets mentioned a lot, its prob bc chevy cuts them off there. Theres no way a 350 hp c5 can get to 172 still pulling, a 385 hp 01 z06 can get to 186 still pulling... and that a 500 hp c6 z06 cant break 190. Think about it. Or go make a spreadsheet and use equations that only work in a vacume.

 

No C5s have any sort of speed related governor. I checked with LS1edit when I first starting tuning my car. 4thgen F-bodies have a 162 speed limiter though.

Dope