Zr1 flat foot shifting tables?

[IDRIVEAG8GT]

Hey guys, I'm not sure how to go about finding these, but I would really like to know which tables are involved in the 2010-2012 Zr1's flat foot shifting feature (Fuel Cutoff for Full Throttle clutch in shifts)

Anybody have any ideas which are involved?

Thanks,
-Robbie.

[DSteck]

Set the park/neutral rev limiter to like 5000rpm. Works just the same.

[IDRIVEAG8GT]

So when you put the clutch in it thinks it's in Neutral? (References the Neutral table)

[LSxpwrdZ]

I've been using the P/N rpm limit for a 2 step/launch control on e38 ECM's for a while. I always disable etc on all of them because it usually results in a lazy feeling shift. On some like our shop car it's only using ignition cut for limiter and makes nice fireballs on flat foot shifting and is handy on ours because of nitrous. Don't have to worry about lean conditions from a rev limiter or rpm window malfunctions with ignition cut because the fuel is always gonna be there.

I used a Lingenfelter LNC-002 for this on my Gen3 Camaro activated by the clutch switch and also worked very well!

[DSteck]

^^^ This guy is right.

And +1 on the ETC control causing lazy shifting when doing it. You can actually see the throttle flutter in the scan on the shift.

[carlrx7]

go here: http://xse.com/leres/ss/calculator.html

pick your car/ trans, you can use it to find shift points via rpm or mph for each gear, helps when tweaking auto trans or in this case finding the rpm drop between shifts.

but fyi, just set it 1000 rpms below the regular cutoff, and i always thought it was a fuel cut (per label of the table)

[IDRIVEAG8GT]

Thanks for all the tips!

[igorsm]

^^^ This guy is right.

And +1 on the ETC control causing lazy shifting when doing it. You can actually see the throttle flutter in the scan on the shift.

You mean only choose ignition rev limiter control?
without ETC and fuel cut?

[DSteck]

I use fuel cut to prevent the flame thrower effect.

[IDRIVEAG8GT]

I use fuel cut to prevent the flame thrower effect.

Flames are fun though!

[DSteck]

I don't think exhaust valves like them very much.

[IDRIVEAG8GT]

I don't think exhaust valves like them very much.

Good point, however, ours is removed so no worries there.

[DSteck]

You removed your exhaust valves? You got a rotary in that thing?

[IDRIVEAG8GT]

You removed your exhaust valves? You got a rotary in that thing?

Yep, and a what? We're running a custom Corsa Muffler setup from Wilson Header that simply doesn't have the valves. The original exhaust sounded terrible when the valves were closed.

[DSteck]

Yep, and a what? We're running a custom Corsa Muffler setup from Wilson Header that simply doesn't have the valves. The original exhaust sounded terrible when the valves were closed.

When I mentioned burning exhaust valves, I meant the actual valves in the cylinder head.

[carlrx7]

omg

[IDRIVEAG8GT]

Oh fuck. Fail. Man I feel really dumb right now.

Let me explain however, the reason I thought you were talking about the butterfly valves in the exhaust is because:

1. The exhaust valves shouldn't be affected by the flame because the fireball doesn't start until the raw fuel hits the hot exhaust of the car, not in the cylinder head itself.

2. The lack of timing leaves raw fuel in the top of the combustion chamber which should actually cool the exhaust valve, not heat it.

3. The valves in the mufflers are the only ones I could think which may be contacted by the flame.

[posenheimer]

if i were to disable the clutch fuel cut off by maxing out speed and rpm and ect, does it still pull the timing in the table? I could just log it and see, but i want to see some fireballs. lol

or if i have my p/n rev limit control set to spark only, does that make tht cfco automatically use spark only as well?

[MikeOD]

^^^ This guy is right.

And +1 on the ETC control causing lazy shifting when doing it. You can actually see the throttle flutter in the scan on the shift.

I've got my cutoff RPM set to 6600 in every gear including Park and Neutral in the "Fuel Cutoff RPM vs. Gear" table, and I still see the throttle close to 30% when I flat foot a shift.

...I do still have the ETC enabled in the "control method" section though. Should I disable it?

[carlrx7]

yes