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Old 12-07-2005, 01:26 PM   #1
Onedwn5up
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Default How do you disable the Stock Speed Governor on the '06 STI?

The '06 STI is supposdly governed at 144 miles per hour or somewhere very close to that. Due to the vehicles short gearing, I am not sure how much faster it really could go over that but it is certainly capable of more than 145 miles per hour I would think.

So how do you get rid of the stock governor? Do you need to reflash the ECU or replace it all together? Is there a speedo sensor that sends a signal to the ECU for it to cutoff at 144? If so where is it located?

Before anyone says anything, this is not for the street. There are some tracks where there is enough straightaway to potentially break 145 and I was just wondering what is involved with this since it would be no fun to hit that rev limiter at that speed.
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Old 12-07-2005, 01:31 PM   #2
Shabib67
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There is no speed governor on our cars. I have taken my 06 sti up to 160 and it didnt stop me.
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Old 12-07-2005, 01:39 PM   #3
Onedwn5up
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Is 160 pretty much the 6th gear redline? Or did it still have a bit more?

Quote:
Originally Posted by Shabib67
There is no speed governor on our cars. I have taken my 06 sti up to 160 and it didnt stop me.
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Old 12-07-2005, 01:51 PM   #4
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Quote:
Originally Posted by Shabib67
There is no speed governor on our cars. I have taken my 06 sti up to 160 and it didnt stop me.
Every STi prior to the '06 has been rev-limited to approx. 149mph in 6th gear, so I'd be surprised if the '06 isn't; it's not a "governor", but rather an ECU rpm data entry. FWIW, both an AP and an ECUTek tune can overwrite this data, effectively eliminating the limiter.

As for it showing "160" on the speedo, no surprise - these cars read a good 10 mph high at those speeds. Trust me, it wasn't going "160." I know...at a steady 140 indicated on my speedo, a friend's (off duty Sheriff) radar gun shot me at a true 132.

Quote:
Is 160 pretty much the 6th gear redline? Or did it still have a bit more?
No. True redline with the stock gearing and tires would yield approx. 176 mph.
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Old 12-07-2005, 02:02 PM   #5
sizzflair
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i went 155 according to my speedometer on my 06
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Old 12-07-2005, 02:23 PM   #6
Onedwn5up
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according to flycaster, it sounds like a 5.5 - 6% speedo discprency at speed, which is actually below the norm. Some vehicles get up to 10% or so.

So at an indicated 155 mph, you were actually doing about 145-146mph, therefore you hadn't hit the stock limiter yet.

Thanks for the info flycaster. 176 MPH is pretty impressive potential.
Quote:
Originally Posted by sizzflair
i went 155 according to my speedometer on my 06
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Old 12-07-2005, 06:30 PM   #7
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Quote:
Originally Posted by Onedwn5up
...176 MPH is pretty impressive potential.
True, but it would take a helluva lot more than the stock HP to push that much air; these cars aren't all that slippery. I'm not sure if my GT30R (370whp) would pull redline in 6th or not, but frankly I don't have the interest to find out.
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Old 02-02-2006, 11:38 AM   #8
anduspeed
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Default how can we remove the top speed limiter?

mine kicks in at 154 and shuts off fuel, than comes back on at 150 ...now i have ecutec reflash and it still does it....im so pissed
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Old 02-02-2006, 11:44 AM   #9
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^^^ mine's running perfect... I did 157 and still going... I have the UTEC...
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Old 02-02-2006, 01:23 PM   #10
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You guys are crazy! Haha. I've seen 142 or something so I guess it was like 130 something after I was tuned. I haven't gone faster than that. But the stock forester speed limiter is like 129 or something.
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Old 02-02-2006, 05:36 PM   #11
boundy3
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I know for the wrx's there is no "official" speed limiter, but the stock ecu cuts off boost at a certain speed limiting the power. With an AP reflash that is taken care of though
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Old 02-02-2006, 06:58 PM   #12
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Quote:
Originally Posted by flycaster
True, but it would take a helluva lot more than the stock HP to push that much air; these cars aren't all that slippery. I'm not sure if my GT30R (370whp) would pull redline in 6th or not, but frankly I don't have the interest to find out.
Finally, someone who is educated on the topic of top speed...

There are a TON of guys out there who think their 230 whp stock STi's go 160-170.

I'm sure your 370 whp will get you well on your way to 170+ though. People don't realize the MASSIVE amounts of HP it takes at those speeds to even gain 2-3 MPH of top speed.

Glad to hear you won't be testing it...smart man.
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Old 02-02-2006, 07:24 PM   #13
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Quote:
Originally Posted by flycaster
Every STi prior to the '06 has been rev-limited to approx. 149mph in 6th gear, so I'd be surprised if the '06 isn't; it's not a "governor", but rather an ECU rpm data entry. FWIW, both an AP and an ECUTek tune can overwrite this data, effectively eliminating the limiter.

As for it showing "160" on the speedo, no surprise - these cars read a good 10 mph high at those speeds. Trust me, it wasn't going "160." I know...at a steady 140 indicated on my speedo, a friend's (off duty Sheriff) radar gun shot me at a true 132.


No. True redline with the stock gearing and tires would yield approx. 176 mph.

When I ran mine up to 150 it cut off right when the speedo said 150... It pulled up to that speed like it wasn't even breaking a sweat then BAM brick wall... So I let off and was like hmm wonder how fast it could have gone - oh well I did it once now I'm satisfied...

I want to say I was about 6k in 6th gear...
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Old 02-02-2006, 09:02 PM   #14
sizzflair
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my car went (when it was stock) 155mph on the speedo at 6k rpm.


now after my stage 2 mods, I wanna see, but I'm not gonna do that lol
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Old 02-05-2006, 12:01 AM   #15
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deff no speed govenor i have taken my WRX to 240kms
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Old 02-24-2006, 04:31 PM   #16
Japanfour
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I have an 04 STi and have hit the 155 mph cut out at about 5800rpm. As far as I know it is an ignition cut off. The only EMS that I have read about that lets you play with rev-limiter and governor settings is the Hydra EMS, but I am hesitant to spend the $1600 to find out for sure. If anyone has heard details about this EMS please let me know. The car's theoretical top speed is 179.6 mph, and I'd love to see how close I could get.
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Old 02-24-2006, 07:01 PM   #17
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If you go to Cobb's web site and check out the AP map notes on the map download page, the notes for Stage 1, 91 octane on an '04 STi says the following for version 1.02. So all maps since then have the following changes incorporated.

"1.02 - Revised wastegate duty cycle maps to accomidate for an obvious tolerance range for the factory VF39 turbochargers. Not all STI producing consistent boost levels, even in testing unmapped, unmodified cars. Developed a wider variety mapping with different wastegate duty cycle mapping to accommodate for this tolerance.
Fixed error with speed limiter. Moved from 147 mph to 310 mph."

Current maps are at version 1.10 or 1.15 depending on the map. Boy am I ever glad that the new limit is 310 MPH, that should give me a little wiggle room for future mods...

So you can disable the speed limit by buying an AP, and as a side benefit you will get 24 different maps you can download and install in your car...
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Old 02-25-2006, 06:59 PM   #18
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I've gone up to 195mph on my speedo... it's amazing how fast you can go if you just change where the numbers are.
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Old 02-25-2006, 07:15 PM   #19
nhluhr
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No way in hell a stock STi is getting much over it's 147mph speed limiter...

This chart is not even taking into account the drivetrain losses, the rolling friction from the tires, the aero drag from the tires rotating, or any of the other losses... JUST the aerodynamic drag of the car moving forward.

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Old 03-03-2006, 01:28 PM   #20
Japanfour
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Exclamation Here's the math

The rolling resistance of a 3300 lb car with 7.5 inch wide tires at 176 mph is 42.9 lbs. Keep in mind that once a car is already rolling this resistance drops as air resistance takes over, but to be sure, we won't count that. Rolling resistance = vehicle weight (3300 lbs) x .013. The air resistance of the 2004 sti is 549.54 lbs (21 square foot frontal area x the coefficient of drag: 0.33 x .00256 x 176mph squared). The total resistance is about 592.44 lbs @ 176 mph (42.9 + 549.54). Now:
Power required (bhp)= Total drag x mph / 375. This is the formula to figure out how much bhp is required to reach whatever speed. So, 592.44 x 176 /375 = 278.05 bhp. Now, if the COBB tuning accessPORT gets rid of the top speed limiter, and you run the stage 2 93 octane (350 bhp/385 ft-lbs) you should not only be able to reach 176 mph, but get very near the rev-limiter which should hit at 179.6 mph due to gearing.
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Old 03-03-2006, 01:34 PM   #21
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Even if the Hp rating is for at the wheels, there is about a 25% loss of power through the drivetrain. You would need about 371 hp to push 278 whp.

Last edited by Japanfour; 03-03-2006 at 01:45 PM.
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Old 03-03-2006, 02:06 PM   #22
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Quote:
Originally Posted by Onedwn5up
So at an indicated 155 mph, you were actually doing about 145-146mph, therefore you hadn't hit the stock limiter yet.
So the limiter is based upon the true speed and not what's indicated in the speedometer? Is there somewhere in the ECU that keeps track of the true speed?

The reason why I'm asking is because in my Passat you could enter the diagnostic mode of the climate control system and it showed various electronic readings including a digital readout of your "true" speed (corrected from what was indicated on the speedometer). However, the speed limiter on the Passat was based upon the indicated speed, NOT the true speed.
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Old 03-03-2006, 02:27 PM   #23
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Quote:
Originally Posted by Picard
So the limiter is based upon the true speed and not what's indicated in the speedometer? Is there somewhere in the ECU that keeps track of the true speed?

The reason why I'm asking is because in my Passat you could enter the diagnostic mode of the climate control system and it showed various electronic readings including a digital readout of your "true" speed (corrected from what was indicated on the speedometer). However, the speed limiter on the Passat was based upon the indicated speed, NOT the true speed.
Just because it is closer to your true speed does not make it your true speed...

True speed(mph) = RPM*TireDiameter(inches) / Gear Ratio * Drive Gear Ratio * 336

I the speedometer is usually just an approximate analog representation of that algorithm. Analog is generally less reliable at extremes (low or high speeds)

The computer however would use that digital formula (which is just as accurate or inaccurate at low speeds as high) to calculate when to place a brick against your chest.

Either way if you changed the outer diameter of your tries the speed limiter would not compensate, and would limit you based on the factory tire diameter and gears in relation to RPM, not your actual speed or your indicated speed.
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Old 03-03-2006, 02:49 PM   #24
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Yeah, I know the difference between what you think your speed is and what your actual rate of travel is.

I was just too lazy to explain that on the Passat the speedo was consistently 5% faster than what was being shown on radar signs. Once you activated the digital speedo, that number it showed was corrected approximately 5% so that it matched what was shown on external radar.
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Old 03-03-2006, 03:05 PM   #25
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not sure about the science above.

i've had my stock 04 sti up to about 145-150mph on the speedo.

the car definitely struggle up there to get that high. you can just feel the wind smacking the front of the car. the hood literally looks like it wants to fly off with the scoop.
interesting to see what stage 2 mods with the right reflash will do. quite curious.
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