Rpm to boost

[mazdaspeed333]

Alright guys so since I keep seeing different numbers, il throw this out there. What rpm is ideal to boost at without hurting the motor. I keep hearing 2500-3000rpm. I personally rather not under 3k tho.

[Hargarbl]

3k + is the general rule

[kby]

Don't go WOT under 3k.
Don't got WOT in 6th, or under 3k in 2-5th.
Don't go WOT if your knocking.


Building boost at partial throttle is fine, just don't go nuts under 3k.

[Easter Bunny]

Idle

[Vansquish]

Most people change their idle speeds to around 1500rpm, to help with brake-boosting, and then really ramp up WGDC and throttle DBW so that full boost is available around 1875rpm, and doesn't really drop off until around 7250rpm.

[mazdaspeed333]

i was questioning the partial throttle also but i suppose thats ok under 3k

i mean you gota give it somthing lol

[SaveMelMac]

My tuner told me 3k. And that's what I go by.

[Snip]

Yup, I also take 3k as the minimum.
5th and 6th gear I wait at least to 3,5-4k before putting it to the floor

[SternRitteR]

2500rpm ONLY if your tune allow this by giving you about 7psi at that range .

So on a stock car thats a big no no as your tempting fate imo .

[mazdaspeed333]

ok, il just continue staying with 3k

but thanks for the help !!! lololololololol

[Vansquish]

Originally Posted by mazdaspeed333 Alright guys, so since I keep seeing different numbers, I'll throw this out there: at what rpm is it ideal to boost without hurting the motor? (A question mark should follow a question.) I keep hearing 2500-3000rpm. I personally rather not get into boost under 3k though.

Originally Posted by mazdaspeed333 I was also questioning the partial throttle, but I suppose that's ok under 3k. I mean, you have got to [If you're going to use "gotta" you should at least spell it correctly. (deleted "gota")] give it something, lol.

Originally Posted by mazdaspeed333 Ok, I'll just continue staying with 3k, but thanks for the help!

And again, I recommend the use of proper spelling and grammar, but most importantly, the use of the search function. Your questions, to date, have all been answered many, many times. You'll get a lot farther here if you do a little bit of legwork on your own before re-asking stupid questions.

[SnailSpeed3]

I totally agree with everything Vanquish has to say, this fucker needs to find the search button and learn how to spell what the fuck he's looking for, just thought this picture was funny

[mazdaspeed333]

lol stfu this isn't an english class you'll be ok.

[Donut]

Originally Posted by mazdaspeed333 lol stfu this isn't an english class you'll be ok.

Wrong. Grammar Nazi is essential here.

[Vansquish]

Originally Posted by mazdaspeed333 LOL, STFU. This isn't an English (Here, "English" is a proper noun, and therefore it merits capitalization.) class, you'll be ok.

I will indeed be OK, especially since your abilities with the language seem to improve when you put your mind on them.

[Goodrich27]

I thought if you did a bov delete mod you could boost up to like 20lbs safely at any RPM?


Sent whilst bojanglen.

[jhg1232]

this is probably a dumb question but just to be certain by no boost u mean stay under 0 psi?

[mxlplx71]

Just put good rods in do what ever

[ASHMS3]

Originally Posted by jhg1232 this is probably a dumb question but just to be certain by no boost u mean stay under 0 psi?

Look man, just don't repeatedly romp on the motherfucker in 6th at 2k rpms and you'll be fine. Take care of the car and it will probably take care of you. Shit happens, but don't be scared of the car. If it's acting like it doesn't like something, like shaking because you're boosting in a high gear, low rpm situation. Then don't fucking do it. I'm not trying to be a dick, but goddammit how many times must we cover this shit.

/rant

Using bad grammar from my cell phone.

[Kyle Undefined]

Fucking brownies.

[Hoyoman]

I've never floored it in 6th today. Might be my adventure of the day. I have on my bike and she's flyinggggg

[Hyper_fail]

Originally Posted by kby Don't go WOT under 3k. Don't got WOT in 6th, or under 3k in 2-5th. Don't go WOT if your knocking. Building boost at partial throttle is fine, just don't go nuts under 3k.

I was searching for this for the past hour. I was worried that me boosting under 3k with partial throttle would be bad.

Its not bad to boost under 3k as long as I'm not going WOT?

[sheston]

I bent my rod at partial throttle under 3k rpms. On the highway in 6th, and went to speed up just a little, trying to get good gas mileage... Don't know what the actual boost was, but the mod's I had done allowed the engine to build too much torque. The real answer depends on what you've done to you car.

If you've freed up the air any, you have to be more careful. The K04 will make lots of boost low, and the Mazda ECU advances timing for fuel economy, a deadly combination.

[MD1032]

I'm pretty sure I'm gonna get flamed for this, but I feel that these rules, which are no doubt well established, are geared towards bolted vehicles. My car's still stock (I just got it) and I don't get huge boost spikes or any of that fun stuff the bolted guys get. I understand that the ECU advances timing on the highway and doesn't retard it as fast as you can mash the gas pedal to the floor. Even with the stock tune, I occasionally get the characteristic 0.2-0.4 KR on initial tip-in. I still don't go WOT below 3k RPM's, but I've floored it for extended periods in 6th gear during a couple high speed runs (by the way, this is the only way to break ~110 MPH anyway) with no ill effects (note that I still drop the car to 5th to pass, again, to keep RPM's high). Would I do this if I was bolted and pushing out 50 more ft-lbs of torque than stock? No...but to some degree you really have to trust that some of the engineers at Mazda did their jobs. This vehicle has the ability to retard boost and timing based on which gear you're in, and it's my belief that Mazda would have done so for 6th gear if this was truly an issue. Furthermore it's my suspicion that with a conservative tune that doesn't have insane torque, it would also be safe to do this.

You can find hundreds of videos of people doing shit like this on Youtube with stock MS3's and none of them blew up. I wouldn't do it every day, but I don't feel guilty about doing it on the conservative stock tune, either.

Originally Posted by Hyper_fail I was searching for this for the past hour. I was worried that me boosting under 3k with partial throttle would be bad. Its not bad to boost under 3k as long as I'm not going WOT?

I still wouldn't do it. The theory behind not doing this is that our vehicles have very substantial torque at low RPM's, more than a Subaru STI. Each individual detonation carries significantly more force than you'd think, and at low RPM's, there are two risks: 1) that there isn't enough oil pressure and the force of the rod will break through the oil film and contact the bearing and 2) That you have a boost spike or predetonation, again, that would cause the force of the rod to break through the oil film and contact the bearing OR just outright bend as stated above.