ddub

Yes my car has seen dyno time, however this was back when it was relatively stock (just exhaust and intake) when I got my s-afc and wanted to tune it. Before I did the TB mod, removed 5th/6th ports, and ported my manifolds I could *feel* my power started to drop off before 7k. Afterwards, however, I could feel a big torque increase ("pull") at around 5k or so, and it continues strong, at the same amount of "pull," until around 7500 rpms. Yes I dont have dyno proof, but I go on the feel of it, and if it feels like it's still pulling hard, and I can stay in a lower gear that will put down more power, I will.

I wasn't trying to state it as fact, I just thought it was funny that someone was claiming you need to spend 5 grand to go past redline.

NZConvertible

My 12AT made over 50% more peak power than stock, and still felt fast at redline, but that peak was still occurring at the same 6500rpm as when stock, and then dropping off.
No, he said you need to spend that money to make power past the redline. Big difference.

Kenteth

I can go past redline.. I don't have that much invested in it (thankfuly) though its nearing right around there.. I should add it up sometime...

MARTIN

doesnt the ecu pull timing at the end of the rpm range???? anyways I blew my motor by reving high w.o any fuel management... Im almost sure that if you plan on going that high that you need some more fuel up top to keep it going with out leaning out..... anyways this thread is already becoming repettative... everyone keeps stressing the same points... yes it has a redline, no you cant rev the stock engine to w.e. rpm you decide, and yes it is dangerous when you take it that high w/o proper tuning/balancing and wat not.... if your stock=dont do it there is no need to....

Kenteth

:sulk:

Impreza2RX7

You also need hardened stationary gears to rev much higher than redline..

Impreza2RX7

I'd do more work than that if I were to rev past redline, I dont dare rev past 7500RPM for fear of blowing my flywheel into my *******..

andrew lohaus

i say unless you have a ported block and a fair amount of other mods, going much more than 150-200rpm past redline is nonsense (at least on an s5 na). the stock ports and manifolds hit max breathing at 7k and it just goes downhill from there. shure, some mods can slightly extend the powerband upwards but the design of the intake mani become pretty usless above 8k rpm anyway. in order to justify routinely going past redline you need huge porting and costom manifolds or at least a RB carb setup (in addition to a hole list of reliability mods to keep it safe).

i say there is no harm in going a smidge past redline if you realy need to hit a shift point, but anything morea and you are just making noise, needlesly wearing the engine, and not even getting very much power.

Impreza2RX7

And if you rev it to high, you could hurt yourself with your flywheel if you dont have a scattershield..

coldfire

iTrader: (1)

i have an S4 engine in my S5, and i take it to 8000 all the time just because the tach tells me that really, don't fret if you get over 7k. as long as it stays under 8k or so. actually, i have got it to 8500 RPM by accident, and nothing bad has happened. actually

i do notice the power drop off after 7k though. i guess the S4 engine has less breath up top...

Russ

rotary engines have a much higher rev limt then piston engines in theary. you should listen to the guys on here that know what there talking about. sure you can go past 7-8k and in theary the engine can. but everything that supports it starts to fall apart at redline. and really whats the point the power surve drops off around redline anyways on stock engines so whats the point of risking your legs?

PureSephiroth

redline is in direct correlation with the amount of chrome on the car.

ddub

Awww I dont have any chrome, my redline must be really low then

BDoty311

I'm sorry guys, but butt-dynos do not count. You're not making too much power up around 7500rpms in a S4. When you start going high over redline, heres what your engine is doing. YOur E-shaft is starting to flex from the rpms and your ignition system and your ECU are trying to keep up. Also you have a 20+lb piece of steel rotating at 8000 rpms 2 feet from your body, along with your clutch and pressure plate. And your not making any power anyways, so whats the point of doing it?

Icemark

S5 flywheels are considerably lighter than S4 flywheels and are generally safe to around 9000 RPM

ddub

Well, another reason for my shifting at 7500 is this. When shifting at 7500, I would be finishing the drag a little past redline in 3rd gear. If I shifted at 7k I'd have to shift into 4th gear right at the end and that might not be so desireable. Is shifting at 7400/7500 really that bad?

BDoty311

Its not bad, but it isn't necessary. But yes if you are drag racing and trying to get a good bragging time, then ride 3rd out. Shifting higher can have its benefits if your powerband is all up high. Shifting higher puts you at a higher rpm in the next gear. But go dyno your car, and take it to 8000rpms, and check out the dyno graph.

tri_tam

i don't know what happen when heavy load
but at idle, i could go all the for a flam show in my s4 gtu.

fastrotaries

there are several ways of making power. Higher revs isn't the only way. F1 does so because they are limited to A) 3.0 liters maximum displacement. B) no force inductions. C) Only regulated fuel can be added to the car, no other element can be added to the combustion chamber besides air. D) they also can't pre-cool the air either.

REFLUX

All S5 flywheels or just NA?

Adam

Dont BE silly! rotary engines are great and they rev high!BUT I have seen them Blow! they are not "Indistrucktable" you red line all the time! you still cause wear! you can down load videos and see what they can handle! parts do fail! even if they are more reliable! i take mine to 6k rpm sometimes!! i dont need to take it higher than that! you can shorten the life of a rotary from working it hard! what about the trany! anyways just look at how long they last before they get a rebuild! Sometimes its a very short life

MARTIN

well I dont know about short lifes of trannys, cus my tranny crapped out on me only after I ran it w/o lube for a few days and on top of that constantly topped out in 4thgear.... plus you gotta remember most these trannies havent been rebuilt and people rag on them after 15+ years??? but yes tranny components can get damaged from excessive reving and/or constant high rpms...

Icemark

All S5 Flywheels