markxrt6 Donating Members 10 Member For: 10y 10m 6d Gender: Male Location: Pakenham Posted 20/01/16 10:03 AM Share Posted 20/01/16 10:03 AM What rpm in 6th with 3.45/manual at 100 kpm Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 28,276 Member For: 16y 6d Gender: Male Location: Melbourne Posted 21/01/16 12:23 AM Share Posted 21/01/16 12:23 AM (edited) From the title of this thread "FG Turbo ZF 6 Speed Diff Ratio" it is 2.73 from factory.To accurately calculate RPM you need the diameter of the rotating assembly (the tyre). I'll do the following calculations for a stock 245/35R19 style tyre.At 100km/h the RPM would be as follows in 6th gear of a ZF:- Factory 2.73 diff: around 1530rpm- 3.45 replacement: around 1940rpmEDIT: since you said manual... I don't know which manual you mean, but I'll show you both- For 100k/h the RPM for 6th gear of a T56:- Factory 2.73 diff: around 1380rpm- 3.45 replacement: around 1740rpm and for 100k/h the RPM for 6th gear of a TR6060:- Factory 2.73 diff: around 1220rpm- 3.45 replacement: around 1540rpmAs the first gear in a ZF is so tall, changing out of a 2.73 to pretty much anything bigger will make it useless on the street. If you're changing from a ZF to a manual, then it's definitely worth putting in a fairly bigger ratio diff. Edited 21/01/16 12:29 AM by k31th 1 Link to comment Share on other sites More sharing options...
PTR_NITRO_FG Donating Members 3,214 Member For: 10y 10m 21d Gender: Male Location: NOR Perth Posted 21/01/16 04:03 AM Share Posted 21/01/16 04:03 AM ^^^ Solid response! Sounds legit Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 28,276 Member For: 16y 6d Gender: Male Location: Melbourne Posted 21/01/16 04:05 AM Share Posted 21/01/16 04:05 AM ^^ this guy ^^ Link to comment Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 16y 5m 20d Gender: Male Location: Perth Posted 21/01/16 04:32 AM Share Posted 21/01/16 04:32 AM Keif ownz a calculator Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 18y 6m 24d Gender: Male Location: Perth Posted 21/01/16 05:05 AM Share Posted 21/01/16 05:05 AM I personally think a 3.0 ratio and zf tune to lock out 2>1 downshift unless you come to a complete stop would be a good thing. Would make 2nd through 6th more useable and take some strain off the drive line Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 28,276 Member For: 16y 6d Gender: Male Location: Melbourne Posted 21/01/16 07:11 AM Share Posted 21/01/16 07:11 AM Keif wrote a calculator applicationFTFY Link to comment Share on other sites More sharing options...
markxrt6 Donating Members 10 Member For: 10y 10m 6d Gender: Male Location: Pakenham Posted 07/02/16 01:44 AM Author Share Posted 07/02/16 01:44 AM Thanks for the replies .Sorry had a few beers before that first post. I should have been clearer. I have a 6 speed zf my diff whine is annoying it needs to be replaced . I have been wondering if its worth changing to a 3.23 or 3.45 ratio . Is there a noticeable difference ? Does turbo load up good ? Thanks Link to comment Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 16y 5m 20d Gender: Male Location: Perth Posted 07/02/16 01:49 AM Share Posted 07/02/16 01:49 AM (edited) If your car is stock, then yes why not. If its modded all it will give is more wheel spin. Go 3.45 Edited 07/02/16 01:50 AM by arronm Link to comment Share on other sites More sharing options...
markxrt6 Donating Members 10 Member For: 10y 10m 6d Gender: Male Location: Pakenham Posted 07/02/16 04:43 AM Author Share Posted 07/02/16 04:43 AM Thanks arronm.Its going for tune soon would have done it years ago but priorities changed for a while Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now