I'm looking at the hitman maps and I'm seeing that he uses fuel cut. It's probably just because of the fuel cut defensers that are used on a non-standalone system that makes me cringe at this. I'm not sure where I saw the option or what enables it but I noticed that there was an option I saw at one point for fuel cut at overboost.

How does fuel cut at redline (and overboost if it would be ultimately the same) any better than our standard setup? Is there any major reason for a straight pipe exhaust to not use ignition cut instead besides fireballs and backfires being annoying?

 

When you get your maps tuned good, try both - the ignition cut is rather violent.  The fuel cut is pretty smooth.  I don't recommend holding the gas on end, but we've hit fuel-cut many times with no drawbacks.  Ignition cut, OTOH, scares the bejeezus out of me when it happens.

Don't confuse fuel-cut with stuff that Mazda programs into the stock ECUs.  It's really two different things.


-Ted

 

yeah ignition cut is violent and it beltches a huge cloud of unburned gas onto the car behind you

 

Can you offer an explanation of how they differ? I was talking to my brother (talon guy) about it and the way it differs but he couldn't really explain it extremely well. The way he said it was that it's not erratic, it's just a clean cut for a longer period of time or something along those lines. If you can refer me to a page that would explain it well or anything along those lines that obviously would be fine too.

So what do you think of the idea of using a fuel cut on boost with a haltech then? It must be dependent on another setting because I can't find it in there at the moment on the Hitman map I've got but I remember looking at it. If I decide to go with a hybrid it seems like that would be a good precaution sense you can only do so much to a stock internal waste gate but I can't imagine that with a decent 38mm tial gate I would be having too much trouble. It just seems like a good way to keep something catrastrophic from happing.

Sorry I'm a FNG at this but I'm tryin, bear with me guys :-)

 

Side note: found out it's something that shows up on the E6X when you switch it to advance mode. Gives you the ability to cut boost at a certain pressure and then see it come back online at a lower (so like 80 kPa and back online at 70 kPa) which is about what I'm thinking about running.

 

So fuel cut on an E6X without sequential injection at WOT in high boost does not cause a lean detonation condition? If that's true, then that's the mode I'd like to use. If there's a risk tho, I'm only running 2mm seals and would like to keep them as happy as possible under the conditions. Comments?

 

I've never messed with the E6X yet, but we've got that option on the E11.

Somehow I don't like the idea of cutting anything to drop boost.
I normally jack all the fuel maps to max at anything over the intended boost.  This usually does this trick on killing any overboost condition.


-Ted

 

yeah it seems if an overboost occurs its better off kinda leaving it alone rather than have the cut. if you do a search theres some reading on that here.

i leave mine rich, in overboost too, and the timing gets a little retarded

 

and if an injector for some reason is leaking or other such failure your likely to detonate... thats putting a lot of faith in **** always working.

 

That's what the EGT gauge is for...

-Ted

 

true, but it'd happen so fast I'm not sure one could react correspondingly... I'm just trying to bring every argument to the table, not saying one is absolutely better than the other...

 

So if I want to run say a max of 10 psi, I should literally max the time on the injectors at 12 or so?

 

You can always run the Anti-Detonation Device.


-Ted

 

That basically it.
If you're at least 20% higher than what it's supposed to be, this should be more than enough fuel to prevent any overboosting.


-Ted

 

No, you are correct.
We just blew up one of the CZ cars because there is a glitch in the E11V1 which literally turns off the ignition and fuel injectors just by adjusting ANY of the maps.  I was stupid enough to be adjusting fuel while under 12 or 13psi of boost at 5kRPM, and it happened so fast it ate an apex seal in a split second.  If I had let it shut itself down, I think we would've gotten away with it, but I was banging away at the keys, so it turned off a split second and it was too late - it caused a quick lean condition which ate an apex seal in the front rotor.

EGT gauge didn't move.
I was watching it.


-Ted