darcati Posted January 28, 2019 Share Posted January 28, 2019 Need to pick the forum members brains on a ZF issue i have with my built ZF. When it does the 2-3 shift in drive on light throttle at around 2000rpm it lets go of 2nd revs rise briefly before 3rd comes on rather than being quick and smooth. It feels like the delay between 2nd letting go 3rd engaging is too long BUT changes below 1500rpm and above 3000rpm are fine. Being new to this I'm not sure if I should I be adjusting off/on going pressures and where would these changes be done? Appreciate any help in advance. Quote Link to comment Share on other sites More sharing options...
richardpalinkas Posted January 31, 2019 Share Posted January 31, 2019 Sounds like it's flaring slightly Quote Link to comment Share on other sites More sharing options...
Yortt Posted February 1, 2019 Share Posted February 1, 2019 On 1/28/2019 at 2:35 PM, darcati said: Need to pick the forum members brains on a ZF issue i have with my built ZF. When it does the 2-3 shift in drive on light throttle at around 2000rpm it lets go of 2nd revs rise briefly before 3rd comes on rather than being quick and smooth. It feels like the delay between 2nd letting go 3rd engaging is too long BUT changes below 1500rpm and above 3000rpm are fine. Being new to this I'm not sure if I should I be adjusting off/on going pressures and where would these changes be done? Appreciate any help in advance. Provided your transmission settings are standard copy the torque converter settings (yes torque converter settings) from a standard sprint tune and try that, it helped mine. 1 Quote Link to comment Share on other sites More sharing options...
darcati Posted February 3, 2019 Author Share Posted February 3, 2019 Thanks Yortt i'll give it a try. Quote Link to comment Share on other sites More sharing options...
Tonez89 Posted September 8, 2022 Share Posted September 8, 2022 Did you ever figure this out? I’ve got the same issue Quote Link to comment Share on other sites More sharing options...
hjtrbo Posted September 8, 2022 Share Posted September 8, 2022 Post up a tune and log man, I'm keen to try and help out. Still learning the ZF's so may end up being hopeless to you. Presume box is in good nick? Give us a bit of info of what's been done. Create a new log layout with just the following channels. Less channels to make it log fast as possible. RPM Throttle Position Current Transmission Gear ID Of Used Shift Pattern Difference speed to synchronous speed Nominal value TCC speed difference (value) Pressure, on-coming clutch Transmission Input Shaft (Turbine) Speed Nominal value of the CRC slip time Pressure, off-going clutch Shift Pattern Throttle Input Value Transmission Oil Temperature TCC Pressure Flywheel Torque Transmission Output Shaft Speed Current Line Pressure Quote Link to comment Share on other sites More sharing options...
Tonez89 Posted September 8, 2022 Share Posted September 8, 2022 It’s an fg na+t,the problem only started after the tune I got,it was doing it in all shifts but I upped the shit pressures 25% and it solved the problem in all other shifts besides the 2-3. it shifts out of 2nd firm and then is like someone very slowly double clutching in a manual and then slams into 3rd,I’ve been talking to the tuner and he’s got no idea what could be causing it,I’ll chuck up a copy of the tune and do a log and chuck that up aswel 2morro arvo Quote Link to comment Share on other sites More sharing options...
Tonez89 Posted September 8, 2022 Share Posted September 8, 2022 This ford/pcmtec stuff is confusing compared to Subarus and using ecuflash 😂 Quote Link to comment Share on other sites More sharing options...
hjtrbo Posted September 8, 2022 Share Posted September 8, 2022 Agree it's a bit overwhelming when 10,000+ parameters are available for adjustment. Just need to break it down into little bits and stick to the basics / first principals. Quote Link to comment Share on other sites More sharing options...
rfh Posted April 17, 2023 Share Posted April 17, 2023 Hey guys, Does anyone know what the CRC acronym is? (CRC slip time) Thanks Rob Quote Link to comment Share on other sites More sharing options...
Bill Posted April 18, 2023 Share Posted April 18, 2023 9 hours ago, rfh said: Hey guys, Does anyone know what the CRC acronym is? (CRC slip time) Thanks Rob Cyclic redundancy check? Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted April 18, 2023 Share Posted April 18, 2023 The more you know... Cream Puff ( also Puff - trade slang )Very clean, well maintained used car. Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted April 19, 2023 Share Posted April 19, 2023 23 hours ago, Bill said: Cyclic redundancy check? The context its used in implies clutch something something Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted April 19, 2023 Share Posted April 19, 2023 (edited) Looks to be related to clutch fill control. It appears to be a mode that can be tuned, adapted and switched on and off, based off a quick look at my personal tcm file. https://link.springer.com/article/10.1007/s42154-018-0031-y#Sec11 Also auF12503 seems to point to the actual acronym being cyclic redundancy check. I could be miles off tho 🙃 Edited April 19, 2023 by Puffwagon Quote Link to comment Share on other sites More sharing options...
Bill Posted April 19, 2023 Share Posted April 19, 2023 10 hours ago, Puffwagon said: Also auF12503 seems to point to the actual acronym being cyclic redundancy check. I had also seen this but wasn't sure how it would apply to all the other places where CRC is referenced. Quote Link to comment Share on other sites More sharing options...
Bill Posted April 19, 2023 Share Posted April 19, 2023 12 hours ago, Roland@pcmtec said: The context its used in implies clutch something something I found some info where CRC refers to Torque converter "clutch release clearance" (CRC). Clutch-Release Clearance 101 - Transmission Digest Changing the nominal slip time characteristics for upshifts and downshifts CRC, increases or decreases ms of slip time. I think @Puffwagon is on the right track as the time taken to apply the clutches would be a direct result of increasing or decreasing CRC nominal slip time. Increased time to apply will result in increased CRC for a longer duration, even though we are only talking ms. Decreasing CRC nominal slip time would result in a shorter time to apply the clutches & less slip time. Happy to have input or opinions on my interpretation. 2 Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted April 20, 2023 Share Posted April 20, 2023 (edited) Just having a read through stuff today, you pretty much need to know how a transmission is built and operated as well as understand the patents for operation etc to get a firm grasp on what some of the more obscure parameters in a tune represent. I also wonder if some of the acronyms are in German, in which case we're pretty much up the creek without a paddle. I found that searching the acronyms in the navigator came up with some interesting stuff, also search slipping and adaptation for more interesting things. There is a lot of stuff that ties in together, it's like a goddamn rabbit hole once you get started 😅 Sonnax has some good info about the zf and 6r80 as well. Accelerator pedal position = DKI The accelerator pedal gradient = DKIG NIC = neutral idle control CT = turbine, possibly ZF is referring to turbine as CTT in the tune? "CRC shift" is used as a noun in the tune. This might be a shift when the tcc is partially locked or unlocked? "CTT shift" is also used as a noun in the tune. This might be a shift when the tcc is fully locked? Clutch area in cm3 is ZF00207. This might change things when you increase the area of the clutch packs? Anyhow I've had enough of that for today. Edited April 20, 2023 by Puffwagon Moved some punctuation 3 Quote Link to comment Share on other sites More sharing options...
rfh Posted April 20, 2023 Share Posted April 20, 2023 Awesome info gents, Thank you Quote Link to comment Share on other sites More sharing options...
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