Hi guys,

I can't really find anything through search (although I'm sure this has been answered) about the maximum RPM limits. I know the GM stage 2, and 3 raise the RPM limits of the car, and I want to do that to my own.

I have HP Tuners and have done some minor things with it, just nothing too outstanding as of yet.

I also have 2.8" pulley, and 60s with cooling mods going in over winter / spring.

Anyway, my question is, what would be considered a "safe" RPM limit for the car? I realize this is more of a qualitative answer than quantitative, but it would be nice to know.

Also, with valve springs, how high could I bump it up to?

Thanks CSS!!

 

You'll get multiple answers here, so don't hold your breath hoping for a definite answer.

Mine is set at 7,450.. I do not rev that high though, not past 7,250 or you'll experience valve float.

Key is moderation. Not need to rev the **** out of it every time you drive.

 

7250

 

7250, stock springs, 7500 78# spring, 8000 rpm 78# springs and neutral or shaft delete.

 

you will not get valve float above 7,250 there is no realy no need to spin it past that the cams fall off

 

Dont go past 7400 on stock valve springs.

 

mine seen 8000 a few times on the dyno regurdless 7400 is a wast the cams fall off

 

I understand that. He wanted to know what the limit was.

 

what iss our stock rev limter 7 ? an i looked into zzp's cams with the stage 1 cams it says u can safely go up to 500rpm. i never really seen the point in going past 7250. 2 much stress on the engine if u ask me.

even when i go to the track i shift a little bit early.

 

stock is 6500.

 

the limit boils down to how big of a set of nuts you have

to much stress lol you have alot to learn

 

I rev to 7400 rpms. Have had the limiter set to that for about 5,000 miles and at 7200 for 25,000 miles before that.

 

This.

 

when i tune my 2.2 what should i set my rev limiter too?

 

stock

 

Thanks for all the answers guy that's VERY helpful. I'm not pushing this car to its limits all the time. It's my DD and so it doesn't get ripped on too often. I'll set it to 7250. I saw an option on the HP Tuners menu for "Lamp RPM" which I am assuming lights up on the dash when you hit the RPM limit. I'll probably leave that around 6750, so I know when I'm getting close.

Thanks again guys!

PS, what's the torque band like in that high of RPM, is it even worth getting valve springs and neutral balance shaft for the extra RPM?

 

even if you build the engine to withstand 15k rpms it would be pointless to rev it that high with the stock head. The airflow through the head is the major rpm limiting factor. The power starts to drop off after a certain rpm because the head cannot flow more air.

 

not true the cams cause it to drop off

 

i guess ur right. although you could port the head and get more rpm also. i was thinking more along the lines of the head assembly which includes the valvetrain. basically what im trying to say is that airflow mostly prevents the engine from revving too high not the strength of the components that hold it together. so if you build the engine to be strong enough to withstand the rpms, you wont get more rpm without changing the geometry of the head assembly.

 

you can port the head yes and pickup more power under the curve but the when the cams quit making power they quit making power and for stock cams we got some pretty decent cams

 

FYI Lamp RPM doesnt work. You would think it would, but it doesnt.

It probably works for other vehicles that use this PCM, but not the cobalt/ion.

 

7600 and above ive had mine come on

 

Safely, from what i've observed so far, is 7250. anything past that you need neutral balance shafts i believe. don't ever redline your engine though, mines still set at stock 6500 but i dont rev it up to that

 

Yeah I've seen it too. Hmmm makes me wonder if its a scaling issue in the code...

Anybody know what RPM the light comes on for other GM cars? Is it anywhere in the 3500-4000rpm range? That would make so much sense. It could be a simple multiplier that needs to be changed by HPT lol.

 

were is that setting in hpt