agreed. i'll let you have honors, as i don't plan on getting near that MPH!!! :chicken: :chicken: :chicken: :chicken: :chicken: :chicken: :chicken: :chicken: :chicken: :chicken: :chicken: :chicken: :chicken:

On a really windy day though I can't get the car over 136 =P

154 was with widows up the best i got with windows down was 142

a) thats aerodynamic drag... not a governor hitting you in 6th gear
b) the rev limiter is 9,000 rpms which looks like 9600 rpms on the tach which really is 154mph in 5th gear

what about a greddy turbo kit with the interceptor-x ems??? anyone got an answer for that?

I know of 240 km/h (149 MPH) legally, on the road, NA all the way. Stock computer. Full exhuast.

question, cant seem to find, but whats the math about the 6th gear rpms??
i remember something that if.. your cruising in 6th at 4k rpms.. its really only like 2k? you divied the number the needle reads by.. 2 or 3 or something and thats what rpm you are really drifting at?

Yes. The RPM's displayed on the tach is a lie. :Freak_ani

The actual correction factor is about 1.0 :uh: But it depends what gear you are in. In first, you need to use 1.0, in neutral and 2nd, you need to use 1.0. Buth in 3rd and 5th, use 1.0. 4th and 6th, on the other hand, use 1.0 and 1.0 respectively.

<heavy dose of sarcasm>

Cheers,
Hymee.

The output shaft turns 3 times per one rotation of the rotor. So at 9,000 rpm, the rotors are only turning 3,000 rpm.

The car is governed by gearing at 184 mph and 6th. (fuel cut off)

see, i ask a simple question, and this is what happends, i read somewhere that in 6th the rpms are a lie, thanks for the sarcastic reply :tear: lol

lies lies lies.
 

so all these statments about the false reading of the rps in certain gears.... anyone here know how to correct this and fix it so that we can reach higher MPH in the respective gears. Cuz gentlemen, i am not feeling this whole 4k instead of 2k rpm deal. :nono:

I read some where that the tach had a 200 rpm error in it, it displays highert than it really is

Give the guy a break. The tach reads what the flywheel is turning, doesn't know what gear you're in. It reads off the front timming disc it has no knowlage of anything else. Nor should it. Everything up to and including the input shaft does not vary.
If I don't say that I mean the E shaft and not the rotors I will get more shit then you did. OK the Eshaft conected to the flywheel then the input shaft via the clutch and we assume the clutch is not slipping. Did I cover everthing, nit pickers?

All you want to know from that instriment is engine speed, in this case defined by the Eshaft. Everyone wants to confuse you by telling you that you are not reading rotor speed. Tell them you don't give a shit and if you did you passed second grade math.

Yep - there is no point worrying about what the rotor RPM is. You could even look at it this way - the rotors has 2 different RPMs!!! It has it's orbital RPM, where the center of the rotor is always following the crank. So at that point, the rotor's RPM is the same as that of the crank. Then the rotor has it's own rotation about itself. Yep - that is one third crank/orbit speed. Its a bit like the earth spinning on it's own axis while orbiting the sun. Except in this case we would have 3 years per day, or 1/3 day per year ;)

There might be a slight display error on the gauge, but I'm not really arguing about a couple of hundred RPM. All the logging I do is with a scan tool anyway, and it is getting the actual RPM as measured by the PCM.

Cheers,
Hymee.

True, I have noticed a difference between the scan tool and the tach.

thanks, i didnt really care, i usually shift between 4.5k rpms and 5.5k rpms, so if im driving in 6th at 4k rpms, i dont really care, nor can i do much about it, i just read somewhere on this site about something like that, and i didnt understand or remember what it was,

I know of a few NA's that did 240+kph.... I myself have done 260 but did not have the guts to go further.. hood was sorta lifting... Not sure how to explain it

The fastest with my NA was 251kmh

Mazda RX-8 highpower
- 231PS
- NA

3500km (2174.8miles) on the engine

TOPSPEED:
261km/h (162.18mph)

I've gotten mine NA to 167. all stock. cold night on a LONG stetch of road. a good mile plus run up. Search my posts I worte a big thing about it about a year ago.

Well, actually, it is.

OEM tach reads 2% - 3% higher than actual RPM.http://www.mazdamaniac.com/portal/smiles/eyetwitch.gif

Yep - I acknowledged that small discrepency.

and that is what i was asking about.. the fact that the reading is "false"

jesus 5 pages and no one chimed in?

indicated 165mph, at 9psi in 6th gear

got there very quickly, and had a little juice left in it, but I was running out of...uh..track. check the sig for mods

It wasn't personal. I was just pointing out that the RPM's display on the tacho in relation to the engine RPM's don't vary according to gear. Your original question suggested something was different about 6th gear. It was a tounge-in-cheek sarcastic reply, meant to have a does of humour. Sorry if it offended.

I don't really think the reading is that false to be much of a deal. How accurate can ones eyes interperate a swinging needle gauge? Probably about as accurate as this discrepency. Much better to log with a scan tool, and then analyse.

Cheers,
Hymee.