Oh daaaamnit! my car will die because of VTEC usage



How am I supposed to drive at 200km/h without entering in VTEC?

Comeon.. we got a sports car.. are we supposed to drive it like grandpas?

 

hey i don't know anything from experience i am actually just looking to buy an S now but i do own a Spec-v for the past 3 years i put 120K in three years on it and V TEC it daily...... i am at 150k now and still good to go............................... and this is a cheap nissan so im sure your HONDA is fine

 

WOW.. would you look at that.. A Nissan with VTEC.... Nice..
I want a Skyline with VTEC.

 

Yes, you are totally missing out on the driving experience. In fact, you are defeating the purpose of the car. Might as well buy an F-16 to drive around town.

As for keeping it in VTEC minutes at a time, yes, it is ok. It's even ok to keep it in VTEC hours at a time. Days. Weeks even. And I'm not joking. At my old internship (Borg-Warner) they had an S2000 engine on a dyno. They were interested in making the timing chain for it, so they needed to test it. They had the thing running WOT at 8500rpm for around 30 hours. I guess Honda told them at ~350 hours, a rocker arm will eventually fail due to fatigue. That's more than 2 weeks.

Also keep in mind that the most wear an engine sees is at startup and shut-down. After that there is hardly any metal-metal contact. When they say 9000 rpm (or 8000 in your case), they mean it....as proven by the fact that the thing can survive a mis-shift without grenading. Very impressive considering that inertial stresses in an engine rise exponentially with rpm.

Basically...drive it like you stole it. You have no excuse not to.

 

he was absolutely, 100% right in what he said. higher RPM allows for multiplication of torque. that means if you make the same torque at higher RPMs, you can use lower gearing and get more force to the ground. physics? how about F=ma. T=Fd. "d" is directly controlled by gearing when the car was designed and built. at higher RPM, you can decrease the d with constant T to get higher F. therefore, you get faster acceleration due ot having constant torque at higher RPM, and that's exactly what he said.

also, RED_MX5 usually uses a g timer to make his comparisons. he's another engineer, so he knows what he means when he talks about the speed of cars. if he says the s2000 is faster than a viper in any specific way, i believe he's got some facts (or at least rationale) behind his statement. if you doubt it, just try asking.

 

Oh oh....we've got ourselves a moron here.

Can someone deal with this retard and his imaginary physics theories...I don't have time for this.

RED MX5 is one of our most knowledgeable members dipshit....please keep the retarded comments to yourself and do yourself a favor - get a high school diploma.

 

Wow, thats really interesting info. So ~350 hours non-stop WOT @ 8500rpms before a damn rocker arm fails! That's insane!

A properly maintained F20/22C will go forever. Proper maintenance and proper driving = a motor that will serve for a long time to come.

Just ask folks who track their vehicles like myself...you spend all day in the 6000-8000/9000 rpm range .... ~3 hours on your average track day.

 

The car is stronger than you if you maintain it.

It's impossible to know the full history of your engine, but I rev the hell out of everything I own and I maintain them beyond the call of duty.

I just sold my 94 GSR with 148k miles that has seen 8k rpms so many times it's ridiculous, stock compression across all cylinders, no grinds in the transmission, never even had to adjust the valves.

No offense but the s2000 under 6k is just a heavy miata. That's "keeping it real" for you.

 

Let me clearify this a little. What I've said is that the S2000 produces *almost as much thrust* as a Viper, but that is only true in first gear, and only in VTEC. The Viper makes a little more thrust even then, and a LOT more thrust at all other times, so if you ever get a jump on a Viper it's because you've done a better job with your car than the Viper driver did with his. In any pull from any speed, a Viper with a decent driver will simply pull away from an S2000.

With the boost my car actually makes about the same thrust as a Viper, but again, it's only in first gear and in VTEC, so I'm making more thrust for an extremely short period of time. Viper still walks away from me, unless I catch the driver napping.

The physics involved is pretty simple. F=MA, or in this case, A=F/M. The force (F) that accelerates a car is the thrust at the contact patch, where, quite literally, the rubber meets the road. The harder the tire pushes against the road, the harder the mass is accelerated. The tires on the S2000 are close to 2' in diameter, so their radius is very 1'. So basically, the thrust at the contact patch, one foot away from the center of the wheel, is going to be equal to the overall gear ratio times the torque at the flywheel (less some losses along the way through the driveline). Just get a dyno chart and multiply the peak torque on the chart times the overall gearing, in first gear, and the result is very close to the car's thrust. Driveline losses were included in the torque measurement if the torque was actually measured with a dyno, at the rear wheels. Do the same thing with a Viper, and you'll see that the peak thrust of the S2000 isn't far off the peak thrust of a Viper, and if you calculate the acceleration at peak thrust the result is even closer, because the Viper is heavier.

BTW, Ace, I use a number of different gadgets to instrument my car, and I think the high resolution GPS data loggers are the most accurate way to measure acceleration. I'm showing a peak acceleration of 0.82 Gs. Car and driver weigh about 3,000 lbs. and in our units that's also the car's mass. Given the peak acceleration and the mass we can calculate the thrust.

F=MA
M=3000
A=0.82
F=3000*0.82 or F= 2460 lbs.

I use to have some thrust numbers for the Viper, but naturally I can't find them now. If memory serves, it's also somewhere around 2,400 lbs. but I only make that kind of thrust for a few moments, while I'm in VTEC and in first gear, so even with FI, a Viper, with it's flat thrust curve, will easily eat my lunch.

As for whether or not the S2000 has sufficient power for normal street driving, that's a no brainer. The car also turns high 13's, stock, with the right driver and under the right conditions, and with modest FI and a good driver the car can break into the high 12's. And sure, that's nothing compared to a superbike, but anyone who think's it's slow, is either jaded, or stupid. When people talk smack about the cars torque, it's because they don't know the diffence between thrust and torque, or the relationship between them, but they're always quick to pass out physics lessons and tell others how stupid they are. LOL, screw 'em. You know how fast your car is. I usually try to be nice and explain things like the importance of gearing and the role that power plays in all this, but if somebody wants to remain stupid there isn't much you can do about it.

 

[QUOTE=sahtt,Apr 4 2008, 06:58 PM]No offense but the s2000 under 6k is just a heavy miata.