Vell

Hi guys,

As I'm using my car for drifting, I was wondering if the long periods boucing the rev limiter were gonna destroy my next engine ... ?

There is any technical solution to make a "clean" rev limiter instead a bee*R like ?

I may say something stupid, but can I make it "regulating" with playing the ignition timing ... ?

cewrx7r1

iTrader: (2)

You could get a three channel unit to actually retard timing instead of fuel as the PFC does.

Or use something like I do with the PFC. I use 8000 rpm max since my porting is almost stock.
Set the rev limit to something very high. It can go over 20K. I use 9999 rpm. Enter 99999 and see what happens on the map. Move timing and fuel columns 2-20 down to 1-19 and use 20 at less timing. I use 0 timing at 9000 rpm. Do not forget to change the map ref table. Thus if I go over 8000 rpm, timing drops to 0 with 15 spit by 9000 rpm but fuel remains the same.
Definitely gets your attention and power drops off.

I also use row 20 for over boost where timing also drops off and fuel dumps in to prevent blowing.

Vell

Thanks, that was the kind of solution I was looking for.

There is any side effect ?

cewrx7r1

iTrader: (2)

Not if you do it only for a short while. Exhaust temps should go up some due to late timing. But if you are running water injection, should not be a problem.

Vell

Thanks, that's my plan
By the way, you were meaning something like a Bee*R about the Three channel unit ..?

cewrx7r1

iTrader: (2)

Any three channel unit. If a J&S, do not get the one they sell for a RX7, get a multi channel.

4WDrift

iTrader: (3)

i have been thinking about rev limiters alot in general. I blew my engine my first day out due to ignition breakup at high rpms. I was retarded and now i ma paying. However this is the same thing that rev limiters do. So how does joon maeng's rx-8 sounds so fiesty without blowing the hell up?

rx7rcer09

on the PFC for drifting i would set the rev limiter at a lower setting so you dont over rev and spin the rotor bearings. IMO 7500 would be a safe bet what are your settings?

Vell

Hi,

Thanks for the input guys.
As soon as my engine come back in the car I'll try this solution and will save some money for a multi channel unit as it seems to be the better way to do it !

cewrx7r1

iTrader: (2)

The problem with that is the way the PFC limits revs. It cuts fuel not timing.
Cut fuel while on boost and your engine can blow up.

My way fuel cut would happen very high and by then timing has already dropped very low.

thewird

iTrader: (8)

I was under the assumption the pfc used ignition cut for the rev limiter and fuel cut for the overboost cut? Is this documented anywhere?

thewird

Taylorjones

does not the pfc have ignition cut on the rev limiter?

Vell

Everywhere they're talking about fuel cut... haven't seen any ignition cut ... (sorry if it's irrelevant ^^)

thewird

iTrader: (8)

That has to do with coming back to idle so yes unrelated.

thewird

Taylorjones

That is under deceleration tho is it not? when you are drifting you hit the rev limit while under a load and with fuel cut you wouldn't get a lot of backfire like ignition cut just what I think

Vell

Ooops, sorry then

As far as I've read, it's always fuel cut related when Power FC + Datalogit, and ignition cut with the Power FC PRO.

Taylorjones

Power FC PRO?

Vell

http://www.paulr33.com/powerfc-faq/powerfc-faq.htm#13