Flat shift works! - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 05-17-2009, 02:04 PM   #1
Elite Member
Thread Starter
iTrader: (15)
 
Join Date: Dec 2007
Location: San Antonio, Texas
Posts: 4,889
Total Cats: 28
Default Flat shift works!

So I have been playing around with the flat shift feature and I have to say I really like it. The hardest part is forcing yourself to keep your throttle foot flat on the floor (WOT) when shifting, which is of course completely unnatural. Flat shift requires that WOT is triggered for it to work. If you lift your foot even slightly, and get out of the WOT threshold (also adjustable BTW) then you will hit the rev limiter.

I shot some video of the flat shift while trying out my roll bar camera mount. There are two pulls in the video, 1st-4th. In the second segment on the 2->3 shift I lifted slightly and it overrevs. In the first segment I lifted on the 1->2 shift; it is a hard habit to break. Otherwise it works, and my foot is flat on the floor for each shift. All I am doing is clutching and shifting. It actually makes for a gentle shift, especially in 3rd and higher.

Spark/fuel cut (got a cat), 4500 RPM set point.

ZX-Tex is offline   Reply With Quote
Old 05-17-2009, 02:10 PM   #2
Elite Member
iTrader: (9)
 
Join Date: Jun 2008
Location: Houston, TX
Posts: 1,583
Total Cats: 8
Default

<goosebumps your car sounds really good. I love the flat shift, but I have the same problem you do. Its hard to convince yourself its ok to lay on the throttle between shifts.
TravisR is offline   Reply With Quote
Old 05-17-2009, 05:02 PM   #3
Elite Member
iTrader: (7)
 
samnavy's Avatar
 
Join Date: Apr 2006
Location: VIRGINIA BEACH, VA
Posts: 6,020
Total Cats: 175
Default

Is a WOT switch OEM on 99's. I don't remember having one on my '93.
samnavy is offline   Reply With Quote
Old 05-17-2009, 05:03 PM   #4
Senior Member
iTrader: (5)
 
Join Date: Apr 2008
Location: VA
Posts: 828
Total Cats: -2
Default

wouldn't the TPS handle that?
thymer is offline   Reply With Quote
Old 05-17-2009, 05:06 PM   #5
Elite Member
Thread Starter
iTrader: (15)
 
Join Date: Dec 2007
Location: San Antonio, Texas
Posts: 4,889
Total Cats: 28
Default

Thanks Travis. Yeah it is hard to keep the foot down when your 'muscle memory' is screaming LIFT LIFT! I was tempted to lower the WOT threshold to compensate but I think I'll just keep practicing instead.

Yes the WOT trigger is handled by the Adaptronic based on the TPS sensor. Once the TPS is calibrated, 0%-100% (just like the MS), then there is a settable threshold. It can be >95% which is what I have mine set at IIRC. So any time the TPS is above 95%, the throttle is at 'WOT' and so flagged in the logic.

The same WOT flag is also used in the Adaptronic for A/C compressor cutoff, just like most OEM setups.
ZX-Tex is offline   Reply With Quote
Old 05-17-2009, 11:13 PM   #6
Junior Member
iTrader: (9)
 
Join Date: Jan 2007
Posts: 455
Total Cats: 3
Default

The way your set up now anytime your over 4500rpm and 95%tps your fuel and ign are cut? How do you disable it?
sv650_ck is offline   Reply With Quote
Old 05-17-2009, 11:16 PM   #7
Elite Member
iTrader: (9)
 
Join Date: Jun 2008
Location: Houston, TX
Posts: 1,583
Total Cats: 8
Default

Most people just put flatshift over the RPM band and it never get enabled. I think you can also uncheck both limiting options nad it does the same thing.
TravisR is offline   Reply With Quote
Old 05-17-2009, 11:24 PM   #8
Elite Member
Thread Starter
iTrader: (15)
 
Join Date: Dec 2007
Location: San Antonio, Texas
Posts: 4,889
Total Cats: 28
Default

Quote:
Originally Posted by sv650_ck View Post
The way your set up now anytime your over 4500rpm and 95%tps your fuel and ign are cut? How do you disable it?
No it is a logical AND. For the flat shift power cut to trigger, the engine has to be over the set point (4500 RPM) AND the TPS has to be above the WOT threshold (95%) AND the clutch switch has to be activated (clutch pressed in). RPM(4500) + WOT (95%) + Clutch (pushed in) = flat shift power cut.

It uses the clutch switch at the top of the travel (not the starter lock out switch) so if you just barely press the clutch it will trigger.
ZX-Tex is offline   Reply With Quote
Old 05-17-2009, 11:34 PM   #9
Elite Member
iTrader: (9)
 
Join Date: Jun 2008
Location: Houston, TX
Posts: 1,583
Total Cats: 8
Default

Oh, my post wasn't very helpful, I see what he's asking now... ooppss.. Well thats how to turn it off if you want to just turn the feature off.
TravisR is offline   Reply With Quote
Old 05-18-2009, 12:18 AM   #10
Elite Member
Thread Starter
iTrader: (15)
 
Join Date: Dec 2007
Location: San Antonio, Texas
Posts: 4,889
Total Cats: 28
Default

You can also just uncheck the fuel and spark cut boxes for Flat Shift method in the Method box (to the right of the RPM set point).
ZX-Tex is offline   Reply With Quote
Old 05-18-2009, 08:13 AM   #11
Elite Member
iTrader: (13)
 
Join Date: Dec 2006
Location: Taos, New mexico
Posts: 5,703
Total Cats: 237
Default

Wow.

Your car sounds amazing.
Fireindc is offline   Reply With Quote
Old 05-18-2009, 09:16 AM   #12
Junior Member
iTrader: (9)
 
Join Date: Jan 2007
Posts: 455
Total Cats: 3
Default

I guess the clutch would be needed for flat "shift" - duh.

If your running no cat what's the preferred cut method - ign or fuel or both?
sv650_ck is offline   Reply With Quote
Old 05-18-2009, 11:03 AM   #13
Elite Member
Thread Starter
iTrader: (15)
 
Join Date: Dec 2007
Location: San Antonio, Texas
Posts: 4,889
Total Cats: 28
Default

With a cat you want to cut spark and fuel. Unburnt fuel in the exhaust can damage the cat IIRC.
ZX-Tex is offline   Reply With Quote
Old 05-18-2009, 04:10 PM   #14
Senior Member
iTrader: (3)
 
Join Date: Aug 2005
Location: Gig Harbor, WA
Posts: 504
Total Cats: 3
Default

Quote:
Originally Posted by ZX-Tex View Post
With a cat you want to cut spark and fuel. Unburnt fuel in the exhaust can damage the cat IIRC.
Wouldn't you just want to cut fuel then so that any excess fuel gets burnt? Or is there not enough to worry about?
TurboRoach is offline   Reply With Quote
Old 05-18-2009, 05:29 PM   #15
Elite Member
Thread Starter
iTrader: (15)
 
Join Date: Dec 2007
Location: San Antonio, Texas
Posts: 4,889
Total Cats: 28
Default

Not sure on that. I have read speculation that with the fuel cut only, it is possible to ignite a lean charge in the cylinder if the injection is partially cut. Not sure if this is a big deal or not, so I just cut both to be safe.
ZX-Tex is offline   Reply With Quote
Old 05-18-2009, 05:56 PM   #16
Elite Member
iTrader: (9)
 
Join Date: Jun 2008
Location: Houston, TX
Posts: 1,583
Total Cats: 8
Default

I'm with tex on this one. Just looking at the motor itself, you could get some kind of an ultra lean burn. I don't know if it would damage the motor, or interfere with the catalyst in your cat. Who knows what it would produce, so its best to just cut both and not worry about it.
TravisR is offline   Reply With Quote
Old 05-26-2009, 10:18 AM   #17
I'm Miserable!
 
Join Date: Feb 2009
Location: Newcastle Australia
Posts: 38
Total Cats: 0
Default

Thanks “ZX-TEX” I’ve had my Adaptronic ecu installed for 2 years now but have not bothered to set up the flat shift. Guess what I’ll be doing on the weekend.
Ted

Why didn't I buy one years ago? (my ex-wife)
NA8 Ceramic coated headers, Hi flow cat, 2.5”system, M45 SC, IC & Adaptronic ECU (plus other bits).
Tedsmx5 is offline   Reply With Quote
Old 05-26-2009, 10:28 AM   #18
Junior Member
iTrader: (1)
 
Join Date: Mar 2007
Location: South Florida
Posts: 491
Total Cats: -1
Default

I am not sure about aftermarket control units, but OEM boxes usually just cut fuel on deceleration and rpm-limit controls.
mrtonyg is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 59 Yesterday 09:00 PM
15x10 - 15x11 6UL @ 949 Racing emilio700 Wheels and Tires 151 06-02-2017 03:36 PM
1991 special edition with hard top full part out JC, NJ russian Miata parts for sale/trade 6 10-08-2015 04:01 PM
Walbro 255lph Fuel Pump $50 lsc224 Miata parts for sale/trade 2 10-01-2015 10:17 AM
Odd Steering issue interestedofold Suspension, Brakes, Drivetrain 5 09-29-2015 02:42 PM


Tags
flat shift

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 05:38 AM.