I was browsing the rx8club forums (as oft I do since I want one so stinkin' bad) and I saw a thread on redlining or rather, revving to a very high RPM in order to open all ports or something like that and that doing so is supposedly good for the engine every once and a while.

So my newbish question is, what about our engines? Is this beneficial for the 13B as well? at what RPM do all ports open up?

Thanks in advance from those who know their stuff,
iSP33D-for-J3SUS

P.S. Here's the thread if you're interested: http://www.rx8club.com/showthread.php?t=83314

 

just rev the **** out of it once it's warmed up, but don't hold it at redline for any significant length of time

that's what I do, and i made pretty good power

 

Yea, Chicks dig the vibrations with the solid motor mounts @ 7K!!!

 

I may be wrong about this, but revving the **** out of it will not open up your ports. The only way the ports will open up, is if it's under load.....driving. Revving it in neutral will get you no where.

 

There has been mention of that on this forum before I think. The explaination I remember was, rev it up till you hear the buzzer, (redline) and it helps keep the carbon deposits clear. Only needed once a week or so, supposedly. I'll ask some rx7 guys i work with and repost tomarrow.

 

i dunno man, my engine seemd to apreciate it when i have it floored at 8K or so in 4th gear There is no doubt that an engine needs to be reved high every so often. This thread should be called "how long can i hold it at redline" I think i've had it at or near redline for about 25-30 mins before, i was on the toll road and burned up like a half a tank But the engine seemes just as happy going WOT in 4th or 65mph in 5th. I guess the only reason i ever use 4th & 5th gear is to save gas.... other than that 3rd gets me to 100 fairly nicely

 

well IMO there's a big difference between holding a car at say 6k and 7k, even when ported. You start to get water pump cavitation at that rpm and you're likely out of your powerband unless you're heavily modified or driving an s5 n/a. Don't get me wrong though, I took my car to Virginia International Raceway and was taching 6000-7500 for three 30 minute sessions. I never go WOT in 4th unless I'm 100+, but then again I've got an n/a.

Plus I can't stand hearing that damn buzzer continuously haha

 

your making an *** of yourself. the ports do open while not moving, and i can provide a video of them doing so.

 

....funny. I guess you missed the part when i said, "I may be wrong." Thank you. And for the "revving the **** out of it," I took it from arghx....that reply was for him. So thank you for not reading what I wrote....***

 

I'm pretty sure that revving it up in neutral will open the 5th and 6th ports, but will not activate the secondary injectors -- which makes me think that redlining under load would reduce/prevent carbon deposits a lot better than redlining in neutral. Sound right?

Oh, they like it with busted motor mounts too. ;-D

 

just get out and have fun with the car ..Gas it, and hit the "buzzer " every once in awhile..the car was made for driving..Enjoy it ,but try not to mistreat it..Me?..I'm gonna get the Revs up whenever I can..I figure I paid for a car to drive it..not to sit and worry about it..I like my car ..so I'll maintain it and try to make it a car that will last (hopefully for a couple years)..If it breaks down, so be it..no big deal..(buzzer ..lets you know that the car can still Give Er!)

 

A redline a day keeps the carbon away.


(Once a week is a suitable replacement for daily.Use sparingly.
Side effects may include: Buzzing in ears, adrenaline addiction, speeding tickets, noise complaints and light headiness due to excessive exhaust fumes.)

I am not responsible for any engine explosions, apex seal loss, loss of fluids (automotive or human) and/or costs to the state.

 

Agree 100%

 

Hey heyyy, there's nothing better than getting clocked going 65mph in a 35mph zone....and only getting a warning. The ticket would've been $300. Got stopped twice in that day too. Once going to work, and after(65mph/35mph). All my luck goes to my Fortune Cat on my dash.

 

Supposedly the Rx8's have a very, hmm... smart ECU? So if you drive like a *****, the ECU will adjust the fuel and timing (or whatever) to give you a ***** tune?

I dunno, dDub has an Rx8 and he was telling me that there was this *theory* (not sure if he considered it fact, so I don't want to put words in his mouth) that the '8 would actually be (and remain) faster, if you drove it harder... The ECU being the variable.

But yeah, occasionally redlining will keep your 5th and 6th ports functioning (N/A's) and keep your motor free(er) of hard carbon deposits, which if built up enough, can dislodge and severely damage your motor as it exits.

 

I don't normally hit redline. but I probably spend about 6 minutes a day over 4500 RPM's. hehe, and 6 minutes is awhile if you don't drive but once in the morning and once at night!

 

I redline my 7's at least once every time I drive them (for any good distance anyways)... Makes for a clean engine...

 

Favorite part is redlining the first 3 gears(except first) going onto the freeway. Best feeling ever.

 

Man this thread is making me miss my S4... Hitting the buzzer in 3rd was bliss ^.^

 

To me bliss is disconnecting the buzzer so I don't have to hear that annoying ****...

Especially with a healthy streetport + mods + light flywheel... You'll have that **** disconnected within a week...

 

I dunno; I drove an FB around for a while and the buzzer in those is brutal; you'd think it was an alarm clock with wheels.

The gentle buzz from an FC is nice, much better than a shift light or something.

 

a redline a day will keep kevin landers away...or something like that

 

^^rofl

 

Yah the PCM (computer) is too damn smart!

It recallibrates itself and retunes itself based on your driving habits. Drive on the highway a lot at cruise? It will compensate over time. Do a lot of slow, stop-and-go city driving? It will compensate over time.

There was a guy on rx8club that cleared his memory, put on a piggy back controller/logger and slowly watched things change over the months. The PCM actually started to somewhat learn the tune from the piggy back and compensate for it. Thus the tune started to become less and less useful over time...

Damn this modern technology, it's time for standalone!

The whole redlining thing on rx8club is just to clear out the carbon. It was actually suggested by Mazda in a TSB. But this was in response to the shitty auto rx8's out there, the old design ones. People were getting way too much carbon buildup, low compression, and many other issues after like 30-50k miles. This was because they were ONLY driving in the 2-3k range all the time. So Mazda basically said "redline your damn engines once in a while, jeez!"

 

Yup redlining helps clear carbon deposits, especially on an auto car. The original engine in my used-to-be auto vert seized do to excessive carbon buildup. After only 80K miles too, long before an NA with a manual tranny would usually die. When Kevin Landers did my TII/auto/manual swap he told me how much he hates the auto trannies and it all started to make sense. The engine is never allowed to redline in an auto car unless you have a tranny thats crapping out and slips out of gear and won't up shift on time.

So basically yeah occasional redlining is good for the engine, but in an automatic cars it is crucial. Anyone with an auto car I would advise to pop that bitch into neutral every week or so and rev that ****** up. I've seen the carbon buildup that an auto tranny helps to produce and it is not pretty.

Oh yeah, when the original engine siezed it ruined most of the engine parts making it non rebuildable. Probably good to keep that in mind.