Rev limiter in the P5
 

ok guys i know this has been discussed heavily that there is a rev llimiter on the p5 at 7100-7200rpm.... So i got my snow tires off today and the dunlops back on, and decide to take her for a nice spin..... so i got some room and im going 15 in 1st gear, so i leave it in first gear and floor it..... i wrapped it up to the top of redline (never done this before, and dont plan on doing it again).... to i guess itd be 8100rpm.... and there aint no damn revlimiter anywhere up there that i found.....

just a piece of info i thought you guys would like to know

hmm well ill have to do that..... lol

What will happen after you hit the rev limiter?

i guess the fuel will cut off, i guess killing the engine, but i dont know

Fuel cutoff. Stops your engine from going anymore, just in case you're wondering :D

it prevents the engine from revving any higher, not from going anymore. you'll know exactly when you hit it. just shift. ;D

i agree, doesnt it seem like it would be easier for them to make the computer skip ignition pulses like MSD does...

either way it kills the engine....now back to the original post...

do you really think it wise to take your p-5 out there and wind it up that tight just to see if you can get it to hit the limiter? come on dude! you are just asking for trouble....take someones word for it...there is one.

i wouldn't say it kills the engine. whenever i race (at the track) i hit fuel-cutoff atleast once since the tach isn't completely accurate during my time trials. i wouldn't sit in that gear and keep mashin on the gas, just shift quick and you'll be fine. i have yet to *kill* my engine by hitting fuel cutoff. i think that's the point of it.. so you don't. and i don't know if anyone else is getting the wrong message.. but you guys keep sayin it 'kills' the engine or 'stops your engine from going anymore.' makes it look like you're saying it's stalling out or literally shutting down. (that's what i see anyway)

I smacked the rev limiter in my Shelby Turbo a few times... quite the experience the first time. Here I was in first, passing & fingering:the finge the guy who just cut me off, wasn't paying attention and "click". There I was with my foot to the floor watching my tach sweep the wrong way! After the computer & head upgrade I was always hitting it, learned to shortshift 1st. quick enough.

Don

correct...that does NOT happen....it only kills it...or stops fuel delivery MOMENTARILY till the rpm's drop back below the specified rpm

ok so here it goes..... i took her out again today to test, so on to the interstate baby.

so i go up onto the on ramp, and max out 1st, no revlimiter, second all the way up to 8100rpm, no revlimiter..... 3rd gear, up to redline and kaboom i hit it, so i shift and keep going, it just feels like a brick wall or something i guess, lol.....

so it is there

I would say you have a problem, or you are going to have one. I know that the BP engines have no problems with 8000 rpm (CSP guys do that all the time), but I don't know about the F-motors. I'd assume the FS-ZE would do it, since the power peak is at something like 7600, but...

So, either your rev-limiter is incorrectly set (FS-ZE computer perhaps), or your tach is WAY off. The tach in my '90 Pro is off by 300 rpm at the cut-off. You might want to hav that checked out at the dealer, unless you want to be able to run to that kind of RPM.:)

That said, running against the rev limiter really isn't a problem. Autocrossers do it all the time. Some cars don't mind, but some do. My Accord had a particularly vicious limiter, that felt like you'd blown the engine. It would drop about 200-300 rpm before giving it gas again. But my Protege would run all day right on the limiter. Cars like the ITR do it all the time at autocrosses (one of the winningest has a license plate "REV LMTR").

well keep in mind, i wasnt staring at the tach, i was watching the road like i should, so i may be off on what i said by a bit...... all i know is that i was in the right ranges..


also i dont run those kinda rpms ever, i usually shift at a max of 6500rpm

I've hit a rev limiter in my Pro5 that was NOT a fuel cut. It was a soft limit that just killed ignition, around 7500rpm

[agreeing with pseudo]
IMHO, whoever came up with the idea to stop fuel delivery should be shot in the head. That is one of the stupidest things you can do to a car. It forces the whole drivetrain to accept a shock very similar to hitting a curb dead-on. Screw emissions it's not worth that. Besides, doesn't fuel act as a additional coolant and lubricant to the engine?