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i am not looking to get a custom 5th gear. if there's something available that could work i am willing to try it out. if not, i will stick to the US version 5th gear
Originally Posted by BLUE TII
For me just going from short S4 usdm TII 5th to shorter JDM S4 5th made 5th gear acceleration much better with 4.10 rear.
Made 120mph--->170mph much shorter time.
With your 4.78 rear 5th is now going to be used even on short tracks.
Have you thought throug trying to get a taller 5th and the impact on the track?
It is going to hurt acceleration where you really need it (back half of short straights and all of long straights.)
at the track i go to (dont really have many options anyway) i barely use the 4th gear. top speeds at the track are around ~120ish mph.
i might eventually bring the car over to the US, then it will be a different story
Originally Posted by mr2peak
How about sticking with the 4.44 and swapping to BNRs or testing Markus's replacement compressors/exhaust wheels? It it's torque you want, maybe Turnip the Boots a bit?
the efr8374 at 30 psi was not enough, i switched to a 9280 and we stopped the boost at 28psi because my motor is 10 years old with very basic upgrades. excellent compression and vacuum 10 years later though and countless track days. my car made 514rwtq on a very strict mustang dyno. i got plenty of torque and not looking to change the setup again especially for a set of twins. even worse if they are coming from that moron marcus or the other guy. BNRs is a good option but not for me
Originally Posted by TeamRX8
you’re actually wrong on this relative to his situation; not sure if you misunderstood or didn’t read it correctly because the CD009 with 4.10 gear will cruise ~100 rpm less than the FC 0.697 gear pair and 4.77 rear gear. I won’t go into it further since he seems to have brought up a trans swap in error per his subsequent post, except to say that the CD009 with 3.91 gear will beat the 5-spd with either 4.30 or 4.44 gear in every regard.
I only mention it because your post suggests not being fully aware of the situation. I get that there are reasons people don’t want to swap the 5-spd out, but he mentioned a T56 swap which is the only reason I went into it. My apology otherwise.
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I did not mention the trans swap. All i said was that maybe they are great but I am not interested in any swap at this point other than off the shelf a 5th gear pair. hence the title ("availability from other models")
Im surprised you have such a big turbo for that. Even my EFR 7670 @26psi seemed like it was just spooling to peak boost everywhere but the short 90mph straight.
Im surprised you have such a big turbo for that. Even my EFR 7670 @26psi seemed like it was just spooling to peak boost everywhere but the short 90mph straight.
Any video?
i was battling a lot of issues with the car this year (new turbo setup,ecu, pdm etc) so the video was the last thing on my mind even though i do have a smartycam gp setup but its not functioning as it should yet. people at the track recorded some short clips but nothing really fascinating.
I will be going back in 2 months. I owe you a vid bud
Let me know what liberty says. I will likely need a main shaft, and the OS gearset is too close ratio for the street, 1st is just too tall. I have a JDM trans.
Of course I keep wondering if a T56 Magnum is just a better solution..
Originally Posted by R-R-Rx7
the mainshaft upgrade has served me extremely well for 8 years now.
i have tried the os giken both on track and on the street. The ratios were good on track but the 1st gear is just too tall for the street for my liking.
Overall it didnt feel like a good compromise for a street/track setup.
the t56 may overall be a better option given that it is a 6speed tranny. I never really looked into them to know what ratios and options are available.
I feel that the oem ratios are great for the track and street use using a shorter final gear
ok, it was suggested by someone else, but you never said it wasn’t allowed (until a later post) or not on the table, just that you never looked into it further and think the 5 spd with lower rear gear is great. I again apologize for misunderstanding the intent.
ok, it was suggested by someone else, but you never said it wasn’t allowed (until a later post) or not on the table, just that you never looked into it further and think the 5 spd with lower rear gear is great. I again apologize for misunderstanding the intent.
no need to apologize my man all is well. its not like you didnt offer a viable solution just not the direction i am aiming at now
here is a not complete chart of all the 5th gear pairs, all the North American cars are there, just not Japan.
i am kind of surprised at the differences
Mazda does do a little mixing and matching, but i also think the early S4 cars might have a different pitch, so you ideally want to swap these in known matching pairs
the two unknowns are the B2600 and the MPV, although being weak lazy piston engines they probably are not taller...
the 929 too, but those earlier Mazda vehicles all had 3.727 or 3.909 rear gears too with the manual trans. So a 0.8xx OD gear would be well suited then. My understanding is that those early manual trans were aligned with the FC trans and if true then regardless of what ratio they might offer it’s not compatible.
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i spoke to paul from liberty gears again yesterday
it appears that we do not have many options with off the shelf items so the custom route may be inevitable. I will try the .719 ratio (as opposed to the .806 i have now) and sort of figure out how much taller (if any) i will need the 5th gear to be
so our current plan is to determine what is the lowest (numerically) ratio without compromising the structural integrity of the gear while the counter-gear fits in the stock FD case using the same synchro.
if for example we determine that the lowest we can go is .700-. the project will end there. Going from .719 to .7, will only save you 100rpm so in my case, going from 3400rpm to 3300rpm..
If on the other hand we can go as low as .6, without compromising the gear/counter-gear fitment and synchro, rpm drops to ~2800.
I did come across a couple of threads from people asking pretty much the same information as this thread. more people might be interested in the longer 5th gear ratio.
Liberty can provide helical gears now. I suppose this has changed since i built my last gearset with them.
If anyone is interested let me know
I might be a buyer in the future but not currently. When I decide it's time to replace the main shaft (or the trans decides for me) I'd be very interested in the longer 5th
This video of my FC has neutral cruise at 65mph in 5th, 4th and 3rd before the pulls.
As you can hear 65mph @ 4,000rpm in 4th its still just the turbo compressor whine you hear at cruise.
3rd @ 5,000rpm the exhaust IS louder than the compressor whine.
3.5" turbo back exhaust with 1 muffler in the system- just got lucky when I rebuilt it and cancelled the resonances the off the shelf JIC Spec 90 exhaust had.
Just saying its probably worth messing with your exhaust, motor mounts and diff mounts no matter what you do for 5th gear ratio.
This video of my FC has neutral cruise at 65mph in 5th, 4th and 3rd before the pulls.
As you can hear 65mph @ 4,000rpm in 4th its still just the turbo compressor whine you hear at cruise.
3rd @ 5,000rpm the exhaust IS louder than the compressor whine.
3.5" turbo back exhaust with 1 muffler in the system- just got lucky when I rebuilt it and cancelled the resonances the off the shelf JIC Spec 90 exhaust had.
Just saying its probably worth messing with your exhaust, motor mounts and diff mounts no matter what you do for 5th gear ratio.
that is indeed very quiet. Its hard to tell how it would sound in person but it does sound great from what I understand . Quiet when you want and screams at WOT. Very nice
thank you for that
Depending on how things go with the custom gear i ll either get the stock US 5th or get something from liberty but i will see what i can do to decrease the drone in my car. I am still using oem mounts (+ the banzai transmission brace) and nylon diff mounts.
to make matters worse i got the ffe motor mounts which i was planning to install after my rebuild (a 10 year old refresh plus some strengthening) . Supposedly they are slightly stiffer than stock so yeah more drone on the horizon lol
10-31-22, 12:44 PM
