redline shifting fact or fiction?

[Juice21]

While I agree that the "duh" part of his comment was not respectful,
I disagree that his comment overall was unhelpful/ not a contribution to your question.

While he didn't directly address the theoretical safety of shifting between 7.5 and 8K, I think he was just pointing out that, if you REALLY can't afford to pay for engine work/damage, it's better to avoid high rpms in the first place. Even if the engine is designed to redline at 7000 or 8000 rpms, if you rely on the car for transportation and have no cash to pay for engine work, it's much more prudent to put off your need for speed and just keep the rpms below 3200 than it is to even go to 5000 or 7000.

Now, it sounds like you want to be able to shift high but do it within relatively safe parameters, that's your choice, still it's not as safe moneywise as keeping the RPMS in the lower range is.

The valve float issue would be the one that would cause you the real financial hardship if you run into it, that's what I would set my shifting limits at and that's what the redline is conservatively set at I believe--it's a warning that the valve train can't keep up with the pistons above that speed.

Also, depending on the age of the valve train, the springs can weaken over time, increasing the amount of time they take to return the valve to a closed position--all springs weaken over repeated cycling and repeated heating/cooling, so the redline for a new engine might not represent the conservative redline for an older engine/older valve springs. I'm not sure how much they weaken or if it's significant, someone else will have to chime in on that.

so in other words u are telling me that once i beat on the car, im gonna have engine issues i have to fix? i dont need anyone stating the obvious. i dont think what he said was a contribution at all. i want to run my car hard, i want to run to where it can handle it. i dont beat on my car i nvr give it more than it can handle. and because i dont have the money to fix any major issues, i want to know what is safe and what it can handle. so i dont see how stating "well dont beat on it...duh", is helpful in anyway.


and i nvr said i want to shift high, all i said is that i heard some rumors and i wanted to clarify if its true or false. even if it was ok to shift at 8k i wouldnt take my car up there. but maybe once or twice i might take my car up to 7.6k if it is safe. but thnx for the information on the valve train etc. i think that may be the next thing i upgrade.

[myk]

If you were tuned on a dyno, you should have a dyno sheet. Look at your peak HP and where it is (probably right around 7K) and shift 200-400 RPM higher than that. There's no point in going much further than that as the higher you go, the more risk of damaging the motor.

Also, one thing that could increase your redline is your valvetrain. The valves have the possibility of floating about 8K on the H22, and that is bad. Stiffer valve springs and cams that can make power above 8K would effectively raise your redline beyond 8K

X2,also you can *kinda tell to by your HP number from the dyno how healthy your motor is and if you should even be taking it up that high.

i say kinda because if your making really crappy power as it is then your motor is probably already beat up, so you taking it up that high is not helping at all.

Take into consideration mileage on the motor, have you had it rebuilt completely? Healthier it is the more abuse it will take before it craps out. Also remember these motors are more or less designed for high preformance running and to handle the abuse you might put on it to a point.

[501accord]

so in other words u are telling me that once i beat on the car, im gonna have engine issues i have to fix? i dont need anyone stating the obvious. i dont think what he said was a contribution at all. i want to run my car hard, i want to run to where it can handle it. i dont beat on my car i nvr give it more than it can handle. and because i dont have the money to fix any major issues, i want to know what is safe and what it can handle. so i dont see how stating "well dont beat on it...duh", is helpful in anyway.


and i nvr said i want to shift high, all i said is that i heard some rumors and i wanted to clarify if its true or false. even if it was ok to shift at 8k i wouldnt take my car up there. but maybe once or twice i might take my car up to 7.6k if it is safe. but thnx for the information on the valve train etc. i think that may be the next thing i upgrade.

It may not be the technical answer your looking for, but I'm just saying, you stated you don't have money to fix your car, but yet you want to know how high you can rev it. I don't mean to insult you, but it seems very irresponsible IMO.

[ChIoVnIdCa]

It may not be the technical answer your looking for, but I'm just saying, you stated you don't have money to fix your car, but yet you want to know how high you can rev it. I don't mean to insult you, but it seems very irresponsible IMO.

Drive it like an old lady and pray nothing brakes till you get some savings.

[confused_accord]

simple answer : KEEP IT SAFE !!

[d112crzy]

simple answer : KEEP IT SAFE !!

oh whatever, you take your shit all the way to 8k I'm going to put your redline at 6k one day just to mess with you . HAHAHA

[WilliamW]

6000RPM = LIMP MODE!

[cvandulken]

its all great and all shifting @ or just before redline... but what you should really be doing that to feel the car, getting to know it... if you can learn the curve of the motor (ie, where it starts to drop off) then you need to shift before then and still try to not fall out of vtec to continue a nice pull. thats what i find produces nice results.