Terrance26

I'm trying to find out how to take the speed limiter off my 8. I heard HKS makes one but I can't find it. Anybody know the specific website. Thanks.

guy321

What speed limiter???

Rhawb

You mean drag? Maybe try making some runs in space or something

Terrance26

The speed limiter. The thing that tells your car to stop making power when you reach a certain speed.

guy321

My car doesn't have one.. What speed are you limiting out on? You should be able to get to 148 - 150ish.. in an MT The car just doesn't have enough power to overcome drag beyond that .

RX8-TX

I don't think you have enough power to reach such limiter in any case.

Terrance26

I have a AT and when you reach about 110 115 you can feel the car stop making power, like the fuel cuts off. It limits how fast the car goes.

Rhawb

Yeah, the only "speed limiter" would be the fuel cutoff for 5th/6th gear and I doubt you can even achieve that unless you're running in theoretical conditions. Either way, why in the world would you ever need to go over like 160 or whatever this car's capable of?

Edit: Just read your post and I've never heard of such a problem. Then again, I've never spoken to someone who has taken their AT to a track. Putting such a low limit on a sports car is pretty lame though. You're not running into the redline in 4th, are you?

RX8-TX

Hang on! This guys' got an AT. I'd have to check if there is an RPM governor on those....

guy321

hmm dunno, wasnt aware of a limiter on the AT 8. The MT doesn't have one.

Terrance26

good looking out rx8-tx

guy321

hmmm

Terrance26

no it hangs at about 4500rpms in 4th and won't go any more.

truemagellen

that sucks

there is a product by FEED but it is to remove the speed limiter on 6MT Japanese RX-8s

also get this out of the DIY section please...I hate it when this section gets cluttered

NgoRX8

iTrader: (1)

some automatics i heard get topped at 125...

crazy naked man

Ive had my MT up to 131 and it was still accelerating, but slowly- I think stock you would hit a power to drag limit at around 150.
I am going to be moving to Europe next year though, and probably putting on a turbo, so those speeds are realistic on the autobahn (at least in spots... contrary to popular belief, there ARE speed limits on much of it).

RX8 Brunei

What you mean is the HKS SLD (Speed Limit Defencer). I have it installed in my JDM 6MT. Here's the link.

http://www.hks-power.co.jp/products/.../sld_data.html

UnstoppableDrew

Don't the AT's have an rpm limit because the torque converter can handle 8-9K rpms like a manual transmission can ?

RX-Aight

The only reason I can think of as to why the A/T would have a speed limiter or govenor is that maybe the trans is not stong enough to handle such speeds thus the lower HP rating.

found this that may help:

"Automobiles are a common application, and modern automobiles are equipped with such a mechanism for various reasons. There are two types of automobile governors, one limiting the rotational speed of the engine, the other limiting the speed of the vehicle. In small, low power applications, governors are used to protect the engine from damage due to excessive rotational speed, or pushing the engine past its peak abilities. In larger, higher performance engines governors are used to limit the vehicle speed. Many performance cars are limited to a speed of 250 km/h (155 mph) to limit insurance costs and/or to reduce pollution."

MintyFresh

Is there a specific model number of the HKS SLD for the RX8 6MT or is it simply a standard Type 1?

TriRx-8

There is a govennor in the 8's and in most cars... its basically so you dont totaly maxxx your car and risk the chance of doing damage to your motor or driving way to fast and well crashing... I believe the 8 in 6th gear governs at 6500-7000 RPM. I cant remember exactly but when i take it out in march I'll let you know...lol

truemagellen

there is no governer in the RX-8 with manual transmission

10kRPMS

Actually there is, it is 148mph for the 6 speed, but the car will go faster I have heard of someone hitting 155 mph going down hill

truemagellen

There is a video of a stock US rx-8 hitting 180 on a Dyno...no ECU modification either...granted it could never do that on the road with wind resistance....that is simply an environmental speed limiter not an internal one


there is no traditional 'speed' governer on the US model of the car...of course there is the rev limiter which could be considered a speed limiter in 6th gear...if u can ever reach it

MintyFresh

So as not to confuse people, its only the Jap domestic models (such as mine is) that have a top speed limiter, this is what RX8 Brunei and I were refering to.