will do, they put out a video.
https://thetuningschool.com/blogs/ne...UHVkNGNIIn0%3D
will do, they put out a video.
https://thetuningschool.com/blogs/ne...UHVkNGNIIn0%3D
Not much of a video
Some actual examples or showing a few things out of the book would have been better than talking about a spreadsheet that any monkey can make that appears to exclude tire size and axle ratio for those that run different sized tires and gearing and talking about how everyone will benefit from it without really showing how or why everyone will benefit from it.
It seemed pretty like a pretty thin book, for as much info its supposed to have. Will see i guess
Agreed, looked a bit skimpy in size for the price.
Another thing to note with their spreadsheet, which sounds like you gotta take their course to get, the values it gives for engine rpm is only applicable with a locked converter. Having an unlocked converter your engine speed will be higher, especially the more load/slip you got at a given moment while unlocked. My spreadsheet I made I include tire size and axle ratio as well as comparison charts to help visually see I don?t have any overlap between gears on up/down shifts.
I don?t know if they?ve factored this into their calculators for the RFE transmissions, no sure what it?s like on the ZF or NAG1, but conversion factor. Having your entered data fall in line with conversion factor affects accuracy of outputted engine rpm. Not a crazy amount but can make a difference of a few mph for those in the racing end that have very targeted speeds for shifts. If the desired value inputted into a shift table doesn?t fit the conversion factor it will just automatically round to the closest number that fits in the conversion factor in HP Tuners, or should as it seems all other tables do. On the RFE?s, every increment/decrement of 1 in hexadecimal is equal to 32rpms and the values are stored in 8 bit. Max rpm you can input would be FF in hexadecimal, or 255 in decimal or 255*32 = 8160rpms output shaft speed.
Might be a bit overkill for most looking to choose their shift points but it?s something I like to factor in.
Last edited by Jim P; 09-15-2020 at 08:51 PM.
Hmm. The first half of the video about OSS speed tuning made me think I don't need this. But the second half made me think it might be worth it.
I want to see what happens when folks start commanding those 1st and 2nd gear shifts just before redline based on OSS to rpm calculations.
I hope the calculator has something to account for shift lead time.
If in doubt, multiply everything by 1.1.
I?ll clean up my spreadsheet and post it up, I got tire size calculations on it for adjusting speedo, show engine rpm and vehicle speed at shift points.
Recieved the book today, for me i think it will be helpful, Comes with a download with all the files, VCM channels. spreadsheet and some stock tunes to look at.
Mines due to arrive tomorrow, I?m mainly interested in their take on the acceleration ramp rates and shift duty cycles.
I am going to end up with more questions. I enjoy doing track days. and love going down the gears as much as goin up. I tried a few tunes, some a crisp rev matching downshifts and some were lazy, slow. I have seen anything in the book about downshifts. Is it the same just opposite?
Downshifts are just the other side of the table on the 8 speeds.
As far as the RFEs go you got the downshift tables and that?s about it. The rest for downshifts isn?t mapped out. Downshift quality, etc is heavily adaptive controlled.
Did anybody buy the companion videos? Are they any good?
IMO the trans tuning should have been part of the PCM tuning. I just received the trans tuning book last night and the 545rfe section is pretty light. If you remove the screenshots from HP tuners and single space the text it would all fit on like 5 pages. They breakup the tuning into mild, moderate, aggressive and tow but in the shift pressure section they use about a page to explain the differences which I can summarize in 4 lines. I swear these books are written like they need to meet a page count requirement.
Mild - add 2% to 1-2 duty cycle
Moderate - add 4% to 1-2 duty cycle
Aggressive - add 6% to 1-2 duty cycle
Tow - add 5% to 1-2 duty cycle
I mean there are 3 pages used to show how to reset all adaptives in VCM scanner. I guess they are writing if for folks who are completely clueless on how to use HP tuners?
I really can't complain though considering they are the only ones offering any info on tuning FCA vehicles...at least that I could find.
That?s all they talk about on duty cycle? Add a small percent to the 1-2 shift duty cycle and that?s it? Kind of a waste.
Is the 8hp70 similar? Please tell me it's better than that.
Also, note my signature....
If in doubt, multiply everything by 1.1.