N54Tech.com - International Turbo Racing Discussion
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rudypoochris rudypoochris is offline
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Default 09-24-2013, 01:52 PM

Quote:
Originally Posted by jb's335
Lol...all boosted cars?

So what if you fall out of boost in between shifts with the 3.08? A larger turbo than stock twins will shift the powerband up on the rev range. I agree with Terry.
This doesn't make any sense. Changing the rear end doesn't change where you land in boost. That ratio is locked by each gear in the transmission. The rear end just multiplies the entire gear set. If you shift out of 5th at 6,000 and land at 5,000 into 6th that will happen every time regardless of rear end. Changing the rear end out will help you to select what ratio you will start or end at in mph. For this car I don't see a point in going for a shorter rear end personally since it isn't going to get you more load for the motor to spool turbos and it may hurt your 60-130 time because a shorter rear gear will mean another shift on the top end. How much it actually matters on 6 gear transmissions though is up for debate. It comes down to intended use.


2008 335i Coupe 6MT
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(#27)
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NetEagle NetEagle is offline
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Default 09-24-2013, 02:14 PM

196 speedometer indicated or GPS speed?




'11 335i LMB, 6M, M-Sport, 35% tint, Stone-X, BMW Performance Exhaust, Shadow Grills, CF competition spoiler, CDV, aFe Stage 2 Intake, cp-e CP, Lamin-X "Tint" Head-Fog-Tail Film, Schroth Rallye 4 Harnesses, debadged, CAN Tool, Vortex 260M 18" Track Wheels with BFG R1 (245/265), Hawk DTC-70/HP Plus pads.

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(#28)
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ApolloTheGod ApolloTheGod is offline
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Default 09-24-2013, 02:21 PM

Quote:
Originally Posted by NetEagle
196 speedometer indicated or GPS speed?
VBox confirmed actually. I could physically not go any faster at all. The car was starting to lift and I had no more pull. Damn aerodynamics!
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(#29)
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dirty330 dirty330 is offline
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Default 10-21-2014, 06:44 AM

Are there anymore people out there that went from 3.08 to 3.46 manual transmission? I've been on every forum out there from supra to mustang trying to nail down a better guideline for turbo car final drive gearing. The main consensus being: one guy will say turbo cars need load to spool, throw what you think about gearing an NA car out the window. Then another guy will post about how that's not proven and a higher geared car will be 10X faster light to light. Anyone out there recently do any gearing changes?
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Stucks Stucks is offline
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Default 10-21-2014, 08:44 AM

http://www.youtube.com/watch?v=RrRIcMAuczg

Dat oil temp increase doe.


Current: 2008 e92 335i coupe.

Previous: 2003 Honda Accord V6 coupe: AEM V2, zex 75 wet shot (sold)
Past 1998 acura integra rs: jrsc @ 6 psi and bolt ons.
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(#31)
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Indo Rider Indo Rider is offline
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Default 10-21-2014, 08:19 PM

Im glad I stayed with the 3.08. The gears already go by fast enough and since I plan to go upgraded twins or single some day I have no doubt it was the right choice.


2009 135i 6MT Jet Black, FBO+
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(#32)
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jbarzelatto jbarzelatto is offline
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Default reviveee - 12-16-2014, 08:45 AM

sorry to revive the thread, but i feel like we didnt reach a conclusion.

I have a 135i 6 speed mt, and have upgraded to the vargas single turbo. i want to know if going to the larger ratio wil give me a faster pull, when for example doing a 2nd gear run on the highway.

we all know that MPG will change, and that revs will run higher.

from what i understood terry said, bascially its a GOOD idea to change to a larger ratio if you upgrade the turbo.

any inputs? lets reach a concensus lol
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(#33)
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frmtl2_335i frmtl2_335i is offline
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Car: 07 e92 M/T
Default 12-17-2014, 09:15 PM

Can you fit a small pumpkin (at) with 3.46 gears in a mt car? Does the pumpkin size affect mounting points?
Basically I'm trying to ask if the at diff would bolt up to a mt car with no mods.


FFTEC 6466 Gen2, MHD Flash Tuned by Wedge, BMS PI Kit, FUEL-IT Stg 3 pump, HALTECH PS-1000, MFactory LSD w/lock down brace, ECS Trailing Arms, M3 control arms, M3 brace, DGR Coilovers, N20 tmap sensor, BMS OCC, VRSF exhaust w/4" tips, VRSF CP, Tial BOV. BigTom FMIC, Msport front & rear, m3 sides skirts.
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(#34)
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johmei johmei is offline
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Default 12-18-2014, 08:20 AM

Quote:
Originally Posted by jbarzelatto
sorry to revive the thread, but i feel like we didnt reach a conclusion.

I have a 135i 6 speed mt, and have upgraded to the vargas single turbo. i want to know if going to the larger ratio wil give me a faster pull, when for example doing a 2nd gear run on the highway.

we all know that MPG will change, and that revs will run higher.

from what i understood terry said, bascially its a GOOD idea to change to a larger ratio if you upgrade the turbo.

any inputs? lets reach a concensus lol
Generally going higher in end gear ratio will be a loss in trap speeds and 1/4 times as most US drivers seems to be bothered about. For a one gear pull you will effectively have 12% more torque to the ground which is probably not a good thing as you reach traction limits already stock in 2nd. With a ST car I imagine you will struggle to put the power to the ground even in 3rd if going with the higher gearing. Also you will be shifting quite a bit more. It all depends on what you use your car for. As long as you are not introducing another shift (because of shorter gears) in a specific situation you should benefit. Go smaller tires to test and see how you like it, it is exactly the same!

For myself, driving a FBO stock turbo MT car at the track (road course), a 3.46 MFactory LSD is getting fitted. I made a couple of graphs and compared the speeds at optimal power to videos from trackdays to see if it would make sense. 3.46 seems like the right choice but I will not know until mid summer. =)

Sorry for km/h but thats how I live my life! =)
(the switch will give a theoretical top speed under 300km/h which sucks)
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(#35)
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lcvette lcvette is offline
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Default 06-11-2015, 08:43 AM

Bringing up an old thread again, does anyone know where I can find a 3.46 ring and pinion set for a 2007 MT bolt on diff? We switch to the large pumpkin in my dad's 135i AT6 car but aren't digging the 3.08 for drag strip launches. Looking to go back to a 3.46 but keep the lsd and large pumpkin in the car.

Thanks!

Chris
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GR1P GR1P is offline
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Default 06-11-2015, 09:36 PM

Quote:
Originally Posted by lcvette
Bringing up an old thread again, does anyone know where I can find a 3.46 ring and pinion set for a 2007 MT bolt on diff? We switch to the large pumpkin in my dad's 135i AT6 car but aren't digging the 3.08 for drag strip launches. Looking to go back to a 3.46 but keep the lsd and large pumpkin in the car.

Thanks!

Chris
Contact Mfactory


2013 135is 6mt - FBO - Pure stg2 - 90/10 meth - Fuel-It stg2
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(#37)
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lcvette lcvette is offline
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Default 06-11-2015, 09:51 PM

OK, will do!
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