I go past 6800rpms in my car.

Third gear is 81mph on the OBD2 output, and 82 on my GPS

I have pulled to the speed limiter, car didnt really have a hard time. It was slow to get there, but it didnt sit there and complain and bitch and moan the way up. It was just slow and steady.


I hate this speed limiter, I wanna hit 140! oh wait, cant. RPM limited in 5th gear is 138mph with stock 15s (175/65)

 

One of the difficulties that drivers have in thinking their car can exceed 110 mph is they don't account for downgrades or tail winds. Next time you get a 115 mph top speed ask if they ran that speed both ways within 5 minutes.
AQnd even getting the speed maxed out takes a lot of real estate just as ststed. So just wait'll the two way average is done.

 

You can get 140 mph with a Fit if you drop it off a cliff and if it falls far enough. (At least 6.36 sec and 650 ft.) But it might require a veyron engine to propel a Fit over 139 mph on level ground.
The Fit's 1500 cc engine is falling fast in horsepower at 6800 so going past is not much use. Remember the horsepower peak is at 5800 rpm; a thousand beyond is completely a waste of time and gas. When you hit 6000 rpm upshift if you want to accelerate faster. waiting til even 6500 rpm is slower.

 

you really do doubt the Fit

have you considered it has one of the shortest gear sets available in a non-sport vehicle?

Its nearly identical to the old B16s, and those things made even a 2wd honda CRV fun to drive.


I have a steep hill on the interstate near me in fort hood, going towards belton//temple.

I can hit 100mph going UP it. On a dead night, I stopped at teh top, and gunned it going down. I was riding the speed limiter before it had made it halfway.

Hill is approx 2/3 a mile, and at base I am usually already going 80mph.


If you really do doubt the fits lightweight and short gearing, why dont you actually go beat on your car and find out?

You sound like a buddy of mine, who drives a Subura BRZ, and has yet to actually go full throttle or over 90mph in the year of ownership

 

Shift at 5800 and fall out of VTEC in the next gear lol

Gear limited to 138? I'm ok with that.

 

138 is moving. Especially in a Fit that a good gust of wind can push around.

I've only had my Fit to 120 and I slowed down in fear of getting a ticket.

I stick to around 65-80 most of the time, its enough for me. Plus it's not fast enough Im giving up my freedom because of speed in a Fit. I mean if we all owned Ferraris or Lambo's but a Honda? LOL The cop carting you off to jail would be laughing.

 

My sport is Land Speed racing. I am more than familiar. Save your lecture and speculation for someone who doesn't know any better.

At sea level even with a slight grade, on stock OD tires, an MT GD3 will repeatedly best 115mph. It will take more than a mile to get there from a standing start however.

The Fit does not have a .4Cd more like 0.34-0.35, it does have a fairly big cross section though at 23 square feet. CdA last I worked it out was ~8.05-8.1, which is huge compared to my DSM at 5.9x CdA.

Yet still very good next to many vehicles on the road.

 

Lets see a video with background sufficient to verify speed.
Try "Fit at VIR" on utube for a good video of the top speed of a Fit, BTW thats verified by two other Fit drivers.
And in measured Cd we got .37 to .38 based on roll-down from 60 mph. I'd be the last to say thats absolutely precise but there's no doubt the Fit is a brick aerodynamically.. A great number of cars measure .32 to .34 and they are slicker than a Fit.
The fit at rated power, 109 hp at 5800 rpm, happens at 99.5 mph and from 5800 rpm the power drops off steadily. If you got 115 going uphill you'd be pulling 6670 rpm. In fifth, at 5800 rpm you'd be doing 127 mph but you won't there because there isn't enough horsepower at 100 mph (4560 rpm, far short of power peak) to go faster. There's a difference between speculation and demonstration.

 

You have verifiable video of course. We do, at "Honda Fit at VIR" on utube, verified also by other Fit drivers. The Fit max horsepower happens at 5800 rpm; thats 100 mph. On dyno curves the power drops off steadily so going faster is queationable without help of a tailwind or down slope. If the grade is less than 1% I believe you can get 100 mph but very little more without power upgrades.
PS I probably have more hours at racing at full throttle than your age.

 

So, where does torque peak again?

I'm glad you think you are the only engineer and racer on the interwebs.

 

Also, just for laughs:


Here's the Fit pulling the top of 4th up a grade... from the very video your told me to look up.

 

Engineers know torque is acceleration; horsepower is top speed. Its work. Besides, since peak torque is at 4800 rpm just what speed would you base on torque?
BTW hp at 4800 rpm is 96. think that helps?

 

Engineers know horsepower is derived from torque, now take a good long look at the BS you dropped in here and then go watch that video you told me to check out.

That is a Fit, accelerating steadily uphill to 106mph @ 6760rpm at the gear change.

Thanks for playing.

Just in case you missed it the first time:

 

There's THAT Fit pulling 106 mph at 6760 rpm.
6760 rpm at 106 mph; thats a very seriously prepared B spec. I suspect way more than 119 hp and much shorter final gear ratio. Its not that the Fit cannot go faster, the dis here was its how fast stock. All Hondas can be 'coaxed' to more speds and hp. I had a CRX that dynoed 176 hp starting with 116 hp stock. Many others had more. as for the lap tuime of 1:07.06 that wasn't at VIR competition course, even the north course. It does appear to be the 'hump' approaching the back strauight corner stand but hard to tell from the photo but there's a tree missing. In that section its downhill from Oak Tree then uphill to the corner station. Maybe if the lap was just the south section a lap of 1:07 is feasible but thats one Ive never run. I think motorcycles run that fairly often.

In any case presenting that as 'proof' a stock Fit will exceed 110 mph is not quite honest.

 

No we didn't miss it; you missed when you thought you could pass off a seriously prepared B spec Fit as stock. I had a seriously prepared CRX that would do that too, some twenty years ago with a 1600 cc engine.

As for torque and horsepower, horsepower is determined from measuring torque in the equation
hp = torque x rpm divided by 5250.
The horsepower at peak torque is 105 x 4800/5250 or 96 hp. The torque at maximum horsepower is 105x5250/5800 or 95 lb-ft. That just means the Fit engine accelerates faster at 4800 than it does at 5800 rpm and by a long shot.
So whats your point about torque?

 

105-106 at the top of fourth sounds exactly right from my experience and that screenshot agrees. This is in a GE and that is a GE in the screenshot as far as I can tell. IDK about GD, i've never driven one.

The car doesn't fall on it's face on the 4-5 upshift. C'mon man.

Anyway. No info on removing the limiter?

DSM since you're here do you have any knowledge of how Apex'i RSM defeats a speed limiter and how it would turn out on a GE? Like I was saying I think it sends a faulty signal to the ECU allowing you to pass the limit, but how would that show up on the dash with CAN-bus com from the ECU? I am thinking the Speedo will just sit at the limit and the RSM will show true speed?

I came to this conclusion looking at the installation manual and it shows two different wiring configurations for speed limit cut and without the cut. The one utilizing the limit cut actually goes into the unit and back out, the one without the limit cut simply goes into the unit to read the speed sensor signal. Because of this I assume the signal out with the limit cut is sending a faulty signal to trick the ECU into thinking everything is good and sane .

See page 8:
http://www.apexi-usa.com/manuals/ele...rev_wiring.pdf

It says "works with new style Honda speed limter" and it has application chart for GD. If GE is the same or similar I assume it will work fine?

 

[QUOTE=Wanderer.;1217738]105-106 at the top of fourth sounds exactly right from my experience and that screenshot agrees. This is in a GE and that is a GE in the screenshot as far as I can tell. IDK about GD, i've never driven one.


QUOTE]


you really think your engine will turn 6760 rpm in 4th? at 106 mph? Perhaps you should remember redline is 6500.
Thats not any OEM Fit but one seriously and soundly modified. I'm wondering if I remember B spec rules that shot would be a legal car.
Any race tabs on it?

 

You are aware that the B-Spec cars run ~33mm restrictors, right? These are not the ones being used in Formula Ford. They are limited by the SCCA to a Weight/Power ratio of 23lbs/HP.. which is WORSE than a stock Fit, GE or GD.

Yea, the old man can continue to go yell at some clouds.

The GE ECU is quite different. In several respects. It would not surprise me at all if the RSM unit is "hiding" the VSS signal from the ECU though.

Where FlashPro just lets me move the limiter(s) as it is reprogramming the ECU instead of intercept/alter.

 

Yes it will, GE's redline is 6800. The motor on the B Spec car is pretty much stock. It's part of the rules. The more powerful B Spec cars even run restrictors on the TB to keep things fair. That class isn't about power and engine modifications are highly restricted.

You know how I know the GE redlines at 6800? Because Honda says so any my car agrees with them every day.

Hm... seems I may just have to try it and find out. The unit will be steeply discounted or free to me so no biggie. Just thought i'd ask before I start monkeying around with wiring harnesses. Maybe i'll contact Apex'i directly (there's a thought )

 

They are limited by SCCA to 23lbs/HP, which should be noted is worse than a stock Fit. Either generation.

Add in some semi-slick 205mm rubber and you lose more to rolling friction than a Fit on all-seasons.

Pretty sure they are not allowed to use a shorter axle ratio either.

I would call first.