drago86

I'm going to be running s5 internals soon and i need to know how to disable the fuel cut (i think its around 7800 rpm on my car) do the latter (88?) ecu's not have it? because i could have sworn ive seen s4 dyno's that go to 8100ish. Thanks.

trainwreck517

iTrader: (1)

N/A's have fuel cut? I thought it was only turbos.

NZConvertible

He means rev limiter.

koukifc3s

iTrader: (3)

why would u want to rev higher tho?
the limiter is at 8750 on s5 n/a

trainwreck517

iTrader: (1)

Rev limiter eh? Do S5 have rev limiter? I have taken mine up too 9k with no problems.

capnChunk

I hear that most people's rev limiters are broken - and that's the nice thing about going to a crane cams ignition or an MSD, you get it back (along with a couple miles per gallon and reaction)

drago86

SO how do you break them? is there a specific ecu number that didnt have them?

RETed

WHY DO YOU WANT TO DO THAT?
There's NO reasonable reason to be revving over 8kRPM in the first place.


-Ted

4fcn121

that is how my buddy blown his engine in the s5 gxl 9000k all the time

NZConvertible

The rev limiter is part of the ECU's firmware. You can't "break" it.

GEINN FC3S

thats y its called a rev limiter, u have LIMITS u cannot pass, ur just asking for another fackin 1500 dollar rebuild that most of us pray for not having to do. damm noobs

totallimmortal

there are many people who belive that the stock internals will hold up fine to high rpms ( I am one of them since i had a bad 3rd gear for a while some times i would rev up to 9 or better) the only problem is that with stock ports you can't flow enough to make power much past the redline

trainwreck517

iTrader: (1)

Most track cars use stock internals with a ported motor and never rev lower then 8k... This is for N/A..

Aaron Cake

iTrader: (1)

Mine never worked. My engine will happily rev as high as I let it. I have heard other FC owners experience this same thing... FWIW...

NZConvertible

How high is that? The S5 has a 8500rpm rev limiter even on the Turbo (7000rpm redline), so if the S4 has a rev limiter it's probably at the same 8500rpm.

The FSM also states a 6.5% allowable error for the tacho, so it might be reading 9050rpm before hitting it.

I still don't see how it's possible to "break" a piece of computer coding. I reckon if you've never hit a rev limiter then either you aren't revving it high enough or there was simply no limiter in the first place.

drago86

my car seems to hit it at 7800 on the tach, im going to be running clearenced s5 internals soon and would like to be able to hit 8900.

shiftnmadkwik

echo

shiftnmadkwik

what are your mods? is your power band shifted that far that you need to rev that high? a stock s4 starts dropping well before that

or you just jealous of the s2000

*a*jones*

i with some of you on this one, i hit 9k one time and experienced no kind of cut out or limiter.

BDoty311

You guys need to stay out of up there if you are running the stock flywheel. Hate to see one of you start a thread "I just lost my leg after my flywheel exploded"

ddub

so how'd you know you went to 9k? do you have an aftermarket tach, cuz the s4's only go up to 8k

*a*jones*

i only did it once and wouldn't reccomend it (unless you built your car to handle it). i was just throughing in my experince in not have a cut out of any kind.;

Slammedblk7

iTrader: (7)

my na hit 9025 according to safc once, when i misshifted...theres your proof.

drago86

anyone in an s4 that doesnt have a fuel cut care to tell me what number is on there ecu case? motor/car is apart right now but its going to be a ported s5 motor w/ clearences suggested by mazda comp. I've allready got a racing beat flywheel in the car, and besides that the plane of destruction for the flywhere on our car is infront of the firewall. Only thing im really worried about spinning it that high is that i do not have retained rotor gears. anyone know someplace that will do it cheap?

SDrotary-FC

i have a old school apexi RSM and it winds out to 8100rpm on a S4