Rev Limit
 

NOOB Alert!

just wondering on which RPM would you set your limiter on your Scion to get the Best potential of the car without wrecking it?

i have searched for it but cant find a better answer from others posts. maybe not satisfied enough.

:thanks:

It's generally accepted that setting it to over 9000 is best.

will it not affect the Car with that high rev? on which gear would you try and reach that high?

just trying to push the car a little bit more than daily driving. :evil::evil::evil:

This guy is trolling you cause you sound like you are trolling everyone here.

Go anywhere up to 7500 rpm in any gear and youre good to go

i like setting my indicator at 7000 and leaving the limiter at 7200. there really arnt alot of reasons to push it any further in my opinion

hahaha.. well its fine.. its his point of view. we never know how most people drive this thing. some uses it as a daily car with just cruising in it and let other drool. I have that in some days.. but some wants to just burn rubber every time coz thats how they fancy the car and stick to the Redline..

i just want to cruise with it then if there will be chances i can burn out.

Max torque as they say on the Brochure is 6600rpm but the driver always feels the difference.

Please correct me if im wrong.. :bonk:

so this is the safest i might change my limiter to 7500 just to be sure..

thanks!

Wherever it's set from factory would be good on the stock engine. Usually those engineer guys know where the limits should be. If you start tinkering with the insides of the engine you can have your builder/tuner figure that out for you.

Nothing was there when i checked it i tried to stroke it to redline last Friday but i have not seen the Red light on the limiter and that made me curious to check whether it has it or not..

Surprisingly nothing was there.. :iono:

did you turn on your indicator? i think it comes from the factory disabled. heres a link:

http://www.ft86club.com/forums/showthread.php?t=8628

i set up mine for 7300. atleast u have some room to rev it more. thats just me

Every engine is going to have a built in rev limiter from the factory. I think you are confusing the actual rev limiter with some kind of "shift" light or something.

A rev limiter, by definition, limits the maximum RPM the engine can turn...if you hit that limit, you will know, because the car will usually jerk as the ECU does what it needs to do to keep the engine from turning any faster. You can raise or lower the rev limiter through ECU tuning only...no smartly-engineered vehicle would allow you to change the actual rev limiter (raise it, anyway) on your own. Too many terrible things can happen if you over-rev an engine outside of its engineered boundaries:

http://img204.imageshack.us/img204/2411/bordelloct9.jpg

I set mine 7200 for rev light indicator.... Just to be safe. My BRZ is my daily driven car and weekend car... I just want to be safe not forcing the engine to much...

:clap: I see what you did there. For the rest of you, just google "Its over 9000."

My shift light was enabled from the factory. Given how this car was developed and engineered, I have a feeling that the rev limit is set at the proper place for 99% of your driving experience.

The factory fuel-cut rev limiter will be fine.

And it's aggressive. If you burn out too hard in 1st gear / slide it and let it get all the way up there, it'll stop your slide in a heartbeat. When it cuts in it's almost like hitting a wall lol.

Set your light at 7000 and pay attention to it.

I set mine to 7000 RPM since that's where the max horsepower is. Anything beyond that is pointless, aside from trying to achieve a higher speed in a shorter amount of time without wasting it on shifts.

Those 200 RPM's aren't going to hurt anything. You will be just fine. mine is daily driven as well, and it sees 7400 a couple times a day. Its good for it actually :)

[ame="http://www.youtube.com/watch?v=9GsgwQpj57c"]11,000 rpm Initial D - YouTube[/ame]

i would set it at 7000...

I actually saw this when i was playing with the display i did set my "indicator" before around 5500 lol.. But seeing all the post here i guess i can put it up to 7000rpm..

So now its set to 7300rpm tried it on second third till fourth gear.. No more road left..

Im just loving the car even more.. Thanks guys!!

Now its time to change this stock exhaust..

sorry but the factory engineers did design this thing to be bounced off the 7400 limit all day long, just fyi...not gonna hurt it... there is room to spare at the top actually, having explored higher rev limits with a tuned car..

[ame="http://www.youtube.com/watch?v=SiMHTK15Pik"]Its Over 9000!!! [Original Video and Audio] - YouTube[/ame]

LOL

How much would it be for your stock pipes shipped to the States?

/vulture

Mine is set at 7,000. Though, you could set it at arond 6,900 or so because when your getting on it once the light goes off you need to be shifting soon without bouncing off of it, thus slowing you down and making people laugh at you so hard you buy a TC.

once i've got mine broken in, i plan on dynoing it, to see where the torque starts dropping off. that's where i'll set my shift light

I thought I read that so far the limit could be changed up to 8 with no problem at all.. Based on my little engineering knowledge, given the safety margin that should be engineered I don't see why 8k wouldn't be safe.. During testing they found out thru computer sims, and real world what the failure rate would be then take it down quite a bit right?? My GSXR 750 has a rev limiter at 14,250.. After computer work I have had no issues at 15,000 at the track and have been doing it for about 5k miles now.. What I got on my forums is 15k is the safest it can go with a stock valve train..

So 8k should be safe here right???

I was under the impression you wanted to shift when the gear your in and the next gear was in the best part of the power... So a little after the peak so the next gear would be as close as possible to peak??

Mathematically the best shift point is different for every gear since the ratio changes but not your torque curve. There's a way to find it but it's something like you want to harness as much torque in the current gear vs how much you'll have after upshifting.

In reality, the way most people drive on a daily basis, they don't exactly bounce it off the rev-limiter constantly. Remember, the limit is a failsafe to prevent dummies from blowing up their engines when they decide to do a sweet dorifto or drag race their friends Tundra. Its not a safety margin as much as its a "tolerance."

From another standpoint, the higher that the revs go, the more stress it places on the engine. And no matter how well our engines are built, they will eventually fail. The higher RPMs, the quicker the engine will fail, no matter how good of care you take with it. By having our rev limiter cut in when it does, they are balancing the power of the engine with long-term durability--remember, this is a Subaru/Toyota shared project. If their sports cars broke down after a handful of years, it would be a huge black mark for them.

So, to summarize, you can probably have the revs limit at 8k. But your engine, in its current/stock form, will not last as long. What that differences is timewise I have no idea.

Yeah.. I had different shift points in the first three gears in my old car I dragged raced.. First and second was about 500-600 rom befor redline, 3 was at redline and 4 th was 400 after redline.. Fuel cut was 500 after redline

im not sure with how much will that cost but im trying to look for a better dealer in UK which is much closer to my place.

If you guys know anyone who can ship it out from UK to Dubai that would be really helpful. as of now we dont have much options here in dubai for this car.

I let my cousin (who knows absolutly nothing about cars) borrow my Frs one day, I set the Rev light to 3000 rpm without telling him about it . He drove it like a grandma thinking he was going to make the engine explode.

I bet he will not opt to buy an frs with that experience.. Lol..

6800 I don't need to wring my car by its neck all the time on normal streets and by the time slow human reaction sees the light and reacts its prob close to 7000 and it gives me a little room to know I really should shift really soon.

Heck I may reduce it to 5000 just to see it work. I have yet to see it work

The issue isn't really whether its safe. Its not necessarily meant to rev that high from the factory, but I'm sure it can do it without falling apart. Rather, the issue is actually making power at 8k. The engine is spinning so fast that it can't get the amount of air it needs before the valve shuts. (reliability concerns begin when the valve won't close fast enough, but I doubt that happens at 8k)

That being said, the reason most car manufacturers have a red line of 6000ish is because it makes for a smoother torque curve and better bottom end power. It's not the revolutions doing this, but the camshaft. A camshaft can be designed to have more power at any point in the power curve, so most manufacturers set it low for daily drivability. (Your "Gixxer" has cams designed for top end performance, so you have to rev the crap out of it make it move like it has a purpose)

Now, I'm not sure what is going on with the frs/brz torque curve, but it probably has something to do with their version of "variable valve timing". I do know how honda vtec works, or at least the old school version of vtec. It's pretty ingenious, and the reason hondas' have such a smooth power curve.

(Warning, boring engineering/history below)

At low revs, the engine functions like a normal engine, but at higher revs the engine needs a way to move enough air so the engine's power doesn't drop off, right? Honda's solution was to add another cam lobe between the two lobes that are already pushing the valves open. This third lobe is more aggressive than the other two obviously. So, around 5000~ rpms a small piston device locks the rocker arms in place, which then allows the third/extra lobe to become the acting one. The valves then stay open a little longer, allowing for more air to enter the combustion chamber. And that's how honda dominated the four stroke hp/L for production vehicle records for a long time.

6800 so it allows me a slight reaction cushion to shift before red zone. We lose hp after 7000 anyways