so I was reading an article about the new HHR SS - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 02-22-2008, 11:46 AM   #21
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A guy I know on the Suzuki Swift forums was using this feature on his MS-II'ed car.
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Old 02-22-2008, 11:52 AM   #22
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Originally Posted by Braineack View Post
cut spark, injectors fill camber with fuel, then when you ignite again you backfire and blow flames out the tailpipe like an *******?
I would rather cut ignition, both would be best, but if i had to choose, the risk of ping puts me of fuelcut.

there must be a reason that UTEC cuts spark, not fuel, right? I think we nailed that reason. Flat shift isnt nice to the engine/drivetrain from the start, who cares if you shoot some flames when using it? Doesen't seem to be a funktion to use with a ceramic cataclyst anyway.

Edit: If you are using MS, it seems like you can choose, fuel, spark or both, with the soft limit being drasticly retarded timing.
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Old 02-22-2008, 12:31 PM   #23
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yeah braineack if my car shot flames i'd look like a le-mans car on the way to the grocery store!
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Old 02-22-2008, 12:51 PM   #24
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how can you get detonation if there's no fuel to combust?
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Old 02-22-2008, 01:47 PM   #25
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exactly^


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Originally Posted by Braineack View Post
cut spark, injectors fill camber with fuel, then when you ignite again you backfire and blow flames out the tailpipe like an *******?
HAIL YEAHHHH!!!! WOOOOOOOOOOOOOOOOOOOOOOOOOO!!!!!!!!!11
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Old 02-22-2008, 03:05 PM   #26
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Originally Posted by m2cupcar View Post
how can you get detonation if there's no fuel to combust?
Problem is that it might be, mixture that didn't have time to get in the combustion chamber, but lingers on the other side of the inlet valve, when it opens, it goes in.

Nevermind, I haven't tried either, and it surely isnt anything you'd want for street driving. I just say, that it seems like standalone manifactors CUT IGNITION FOR A REASON.

Please, megasquirters, try it out, you can choose, cut fuel only, and monitor knock, prove me wrong please
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Old 02-22-2008, 03:13 PM   #27
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These guys make flatshifters.
http://www.tekniqauto.com/US/tsport/tsport.htm

Read their info.
3. A fuel cut only system runs the risk of leaving small amounts of fuel flowing through the engine which may ignite risking lean burn and engine damage.

They also cut fuel, to eliminate flame shooting.

So, as I see it, cut fuel only -> knock knock
cut ignition only -> fire!

They should have some R/D behind their reasoning, don't you think?

If you are not convinced yet. Then i dont know how to convince you.
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Old 02-22-2008, 03:16 PM   #28
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ignition cut sucks. I dont see where most manufacturers cut ignition....it's a cat killer.

so here's your argument....you are worried about a tiny pissing of fuel that may/may not burn when you don't want it to....

but you want to fill your chambers up with fuel during ignition cut and then roast marshmallows from the flames out your tail pipe. that doesn't worry you one bit.

i had spark cut turned on and when i hit overboost protection a few times i remember the bazooka i launched out of my tailpipes and all the insurgents ducking for cover. (and i wondered why my cat got clogged?). It's violent and loud when it ignites again, great for keeping turbos spooled on flatshift, no reason for it otherwise.

monitoring knock during this situation will be pointless....it will look my jagged pimply ***. becuase of all the noise from the rev limiter and then WWIII.
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Old 02-22-2008, 03:18 PM   #29
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Im glad you skipped over the ******* line just above what your god damn copied:

1. A spark only system on an EFI car will allow raw fuel straight through the engine and will rapidly contaminate the catalytic converter and destroy it. Excess fuel will also wash the bores and contaminate the engine oil system risking long term bottom end damage.


:f awk:
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Old 02-22-2008, 03:19 PM   #30
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quoting myself "Doesen't seem to be a funktion to use with a ceramic cataclyst anyway"

but yeah, i think you got me.

A ceramic cat would survive it no hassle, and for a full drag car, where you'd like to use it, how many of those do you know that runs cats?
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Old 02-22-2008, 03:22 PM   #31
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we are talking about the new HHR SS here. a street car running two or more cats from the factory, for the massed, for your mom to go get groceries, for you not to get laid in.
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Old 02-22-2008, 03:25 PM   #32
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geeez, since you've gotten personal, now, I can't see wtf you cant just recognize that cutting fuel only would be dangerous? too much of a following here to change your erlier position?

If you look some post above, i said that cutting both is best, but if i had to choose, i'd cut ignition. Cat's are no worries unless you run some shitty ceramic cat (witch suck), and come on, long term damage, yeah, same long term damage the guys who run 11:1 a/f will see, as is common with flooding. If you are running flatshift, I'd think that you check your oil from time to time, no?

and yes, i left it out, posted the link so that all of you could see it, only quoted the one sentence that i was talking about.
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Old 02-22-2008, 03:26 PM   #33
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you, are, stupid.
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Old 02-22-2008, 03:26 PM   #34
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Quote:
Originally Posted by Braineack View Post
we are talking about the new HHR SS here. a street car running two or more cats from the factory, for the massed, for your mom to go get groceries, for you not to get laid in.
And thats why they probably cut both, so that they don't have to change ENGINES destroyed from knock, and CATS destroyed from exessive fuel.
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Old 02-22-2008, 03:27 PM   #35
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no they just cut ignition.
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Old 02-22-2008, 03:28 PM   #36
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Originally Posted by Braineack View Post
you, are, stupid.
thank you, right now, coming from you, i really don't think thats an insult.
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Old 02-22-2008, 03:30 PM   #37
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Quote:
Originally Posted by Braineack View Post
i assume theyd cut fuel not spark....
Quote:
Originally Posted by Niklas View Post
Wouldnt this be quite dangerous in case of any lingering gas?

edit: looked around a little, at least the UTEC standalone uses ignition cut, not fuel cut.

And for the less gifted, here is a reminder of how it all started.

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Old 02-22-2008, 03:34 PM   #38
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Quote:
Originally Posted by Niklas View Post
Doesnt the engine just cut ignition? thats how it usually works for the drag guys.

actually this is how it started.
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Old 02-22-2008, 04:00 PM   #39
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Deleted. Don't want to get involved.
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Old 02-23-2008, 12:20 AM   #40
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SO.....

The article I read says "the flat shift on the HHR SS keeps the turbo spooled"

Thus I assumed it was a spark only cut?
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