hey i was wondering what a good redline was ?because i was tolk that a rx-7 really dont have a redline.

seriously?

rx7's come from the factory with this round thing. it has red.uuuuummmmm lines on it. that would be the factory redline and yes they have redlines. they like to rev and are less to damage anything over revving but it depends. the redline is there for a reason https://www.nopistons.com/forums/pub...IR#>/smile.png

im this site's dumb rotorhead, and even i know that the car has a redline

My car is white, it doesnt have a "redline".

oh yeah, like most things that that are physical, rotary engines have natural frequencies / yield stresses / fatique limits / etc.



as a result, rotary engines have red lines, or a limit as to how fast the internal parts can revolve without failing. this might be a surprise because of the deseptively smooth, free revving nature of the wankel, however, it is purely a myth. ROTARIES HAVE A REDLINE, JUST LIKE EVERY OTHER ENGINE.



1st gen: 7K

2nd gen (s4): 7K

2nd gen (s5 NA): 8K

3rd gen : 7.5 K?

RX-8: 9K

Mine can go as high as i want it to. no redline here!

1st gen: 7K

2nd gen (s4 na and turbo) - 7k

2nd gen (s5 gtus): 8K .... (turbo) 7k

3rd gen : 8.5k

RX-8: 9K

just think, with no redline, you wouldn't need gears! put it in first and keep going

you mean im not suppose to do that! https://www.nopistons.com/forums/pub...#>/biggrin.png



Heres a little story one day i decided to let someone i know drive my car they started out going nice and easy through the first few gears and then started to push a little harder. I told them not to go over redline, they look over and ask wheres the redline i dont see it? I amediatly had them pull my car over and get out.

now that's a response!



[sarcasm]



yeah, they have no redline, and their torque curve is a flat platue with a value of around 200 ft-lbs, constant all the way up to an infinite redline. as a result, rotary engines dont need a transmission. that's why our cars weigh 250 lbs less than a comperabley equipped piston engine, that and the engines weight less.



[/sarcasm]

Most of the redlines are meant to keep the accessories from over spinning https://www.nopistons.com/forums/pub...DIR#>/wink.png. But yeah, the little engine has limits due to the strength of the materials due to what the other people have said.

now is that where the redline starts or where the rev limiter is? cause I have a s4 non turbo and it hits the rev limiter at 8k.. and my old s4 turbo II did the same thing. https://www.nopistons.com/forums/pub...IR#>/boink.gif

answer to question----- shift at 7k..OK LOCK IT! https://www.nopistons.com/forums/pub...IR#>/bigok.gif

i shifted my 87 SE when i couldn't stand the buzzer anymore, when dragging, upwards of 8.5k...i guess that might not be a good idea since the redline seems to be 7k...it's still running tho, i just don't own it anymore :P



Sean

Alright, this isnt first hand experience, but a close buddy of mine took a ride in his buddies modified 1st Gen EFI. He wanted to see how fast he could get the car going in second gear. After pinning it for a while, the car reached around 90 mph. He obviously couldnt read how fast the rpms were but the tack had wrapped around and was pointing in the low digits. He ended up shifting to 3rd, locking up the back tires and crashing the car, but thats not the point. These engines basically can rev for ever. If you feed them enough fuel and keep them cool enough. Although, I have heard, and seen on vids of rotary engines that explode from over reving. There's just to much inertia from the rotors that engine housing cant keep them inside and the rotors go flying.



Im not saying, go out there and rev them as high as you can, they will overheat and cause you many problems, best idea is to stick to the stock redline.

u r smrt



what the ****?



please disregard the misinformation in the above post(s).



13b's cannot rev to infinity and beyond, there are mechanical limits... it's been run over a number of times on the forum in the past I'm not going to rehash it here.

there's no redline, until your flywheel flys off and you are missig your legs

The redline of any motor is a factor of 3 things that I know of, strength of the parts, cooling (oil and water), and power.



The whole power thing is a big one because its a factor of strength and cooling. If your car cannot produce power in the higher rpms, it cannot keep pushing itself. Its the whole inertia thing.



Rotaries are limited by the stationary gears, oil pressure, oil cooler, apex seals, and PORTS!!!

dude i shift at 15k, and i shift mad quik too yo!



kevin.

I,,,, Shift Mad Quick





Blink of an eye type ****



Chris

Look at a dyno sheet, this will tell you, without a doubt, where a good point to shift would be. The hp and tourque curve begin to go flat and/or actually decline, so winding past redline in most cases, even if the engine seems it will keep going, allows you to LOSE hp and tourqe, not to mention put undue stress and pressure on engine and running gear components.

It's still not exactly useful without knowledge of the gear ratio you are in, if the gear ratio is such that the mechanical advantage is still resulting in greater torque @ the rear wheels than you would have with an upshift putting your engine in the meatier part of it's power band, it will still be advantageous to continue revving in your current gear, regardless of the power dropping.



shift up and you lose mechanical advantage (torque multiplication).

of course, mostly a generic reply on my part. grossly exceeding redline leaves a disadvantage to most.

y's it have a redline? u c that vid of the FC vert who redlined it for a couple mins?



BOOM.

They had the radiator cap off. And it was already blown.