Speeds

[jeffcoslacker]

ALL ECM controlled cars have a governor for top speed or RPM, which would in effect, limit top speed.

[notyouraveragegirl]

Originally Posted by SenseiAccord

no no no no again. I meant since stock tires that come with the car are H rated. Since they put H rated tires on the car they set it so u cant go over that speed rating. Not everyone soups up cars and changes out to Z rated or whatever tires. do u guys still not get what im trying to say? The average person doesnt take a car and swap out the tires. when the average person wants to buy tires they usually buy the same as stock... not get rims and buy Z ratings. Im not saying at all the ECU senses what speed rating tires u have and sets it so u cant go above that. I talking about since it comes STOCK with H rated they dont want anyone to go over the STOCK speed rating of the tires that come with the STOCK car. you guys understand now?

OK - I totally get you sensei, but, if that's true, why does my 98 3.0 V6 hit 140 with no real struggle if the stock tires were H rated at a max 130mph? Is that just luck?

Note - It has Z rated tires now, although i understand that either way it isn't a factor, computer-wise

[AccordCodger]

ALL ECM controlled cars have a governor for top speed or RPM, which would in effect, limit top speed.

On what do you base that?

[jeffcoslacker]

Originally Posted by AccordCodger

On what do you base that?

Let me put it another way. I am not aware of any that were not governed in some way. It would be seen as irresponsible by a manufacturer to not limit top speed if able to do so, allowing a car to travel well in excess of what it's tires and aerodynamics were capable of while still maintaining some semblence of control and stability. It is a liability issue more than anything else, and requires no more than a line of code in the programming. Even a certain versions of Corvette would be capable of over 250 mph going by horsepower and gear ratios, but the chassis and rubber aren't engineered for that. I've yet to drive a computer controlled car that didn't lay down at a set speed and stop pulling. My '94 Impala SS hits the wall just short of 145. My '97 Lumina flattens out at 115 (an LS with speed rated rubber stock, the base model gives up at 90 something) My friend's Civic SI bounces off the ceiling at around 130.

[BNR34_V-SpecII]

Does it change anything if your is mild modified? Like mine. I mean in sense of speed limiter.

[SenseiAccord]

Originally Posted by notyouraveragegirl

OK - I totally get you sensei, but, if that's true, why does my 98 3.0 V6 hit 140 with no real struggle if the stock tires were H rated at a max 130mph? Is that just luck?

Note - It has Z rated tires now, although i understand that either way it isn't a factor, computer-wise

... maybe ur ECU sensed u got Z rated tires and changed it??? nah im just messing witchu sense everyone thinks thats what im trying to say.

[notyouraveragegirl]

ha ha sensei dont worry - i understood you the FIRST time you posted

Just a quick overview on the 98:
heads ported and polished
the cat has been replaced with an empty pipe (talk about hi-flow)
we had a cool-air intake, but after the engine almost hydrolocked the day I moved here from the East Coast... ...well we haven't put it back on since
Tires are Z-rated
and all the normal parts are top quality (rotors, spark plugs, etc...)
i think i might be missing a thing or to -- but all mods have been minor

ANYWAY---This car routinely hits 140-150 COMFORTABLY... so
Honestly, I don't believe there's a sensor -- cuz if there is mine must be broken

[BNR34_V-SpecII]

nevermind.

[jeffcoslacker]

Originally Posted by notyouraveragegirl

ha ha sensei dont worry - i understood you the FIRST time you posted

Just a quick overview on the 98:
heads ported and polished
the cat has been replaced with an empty pipe (talk about hi-flow)
we had a cool-air intake, but after the engine almost hydrolocked the day I moved here from the East Coast... ...well we haven't put it back on since
Tires are Z-rated
and all the normal parts are top quality (rotors, spark plugs, etc...)
i think i might be missing a thing or to -- but all mods have been minor

ANYWAY---This car routinely hits 140-150 COMFORTABLY... so
Honestly, I don't believe there's a sensor -- cuz if there is mine must be broken

One possibility: If you changes the stock diameter of the tread by using a different tire size, the computer would not sense your speed correctly. So if you are slightly overstock, the margin of error increases with speed. By the time you get in the 100+ range the error is likely to be as much as 10 mph or more. But your speedo error would be as well. The speed is sensed by wheel rotation (actually gear speed), and assumes the size of rubber the car came with stock for the reading. If you run larger than stock diameter, you travel more road for each rotation than the stock tire, so your indicated speed reads lower than actual. Go the other way with tread diameter, and the opposite happens.

I'm not up on Hondas, just came over here looking for some advice on one I'm working on. (please someone answer my '87 short to ground post) American cars use a VSS, vehicle speed sensor to tell the ECM what the actual speed is, and is seperate from the speedo reading. This is what the ECM uses to determine throttle cut-out speed.

At your top speed, are you redlined, or still have RPM's to spare?

[SenseiAccord]

well i dunno... like i said before some ppl believe only the DX and LX models have speed governs. well thats what they claim for my gen accord (4th gen) im assuming the v6 accord is above the DX, LX so maybe urs dont have one either. but we need a honda mechanic here to answer this question to be 100% sure.

Anyway i have an 90 EX and mines shouldnt have one according to the information i heard but my car only maxed out at 115 in 5th gear. i have i/h/e, no cat, clutch, 12 lb fly, msd, plugs, wires, drop and 16" konig rims. but then again i was going on a 15-20 degree uphill so it could have affected it. In hawaii that is our only "straight" away that is safe enough to top out. the cool thing was i was keeping up with integras hahahahahha. sad huh? nah one disconnected his vtec on his ls/vtec swap and the most modded one is automatic and the other one just had intake, teins and uncapped exhaust.. all were 94-99 tegs.