home register FAQ memberlist calendar

Go Back   Turbobricks Forums > Mechanical > performance & modifications

Reply
 
Thread Tools Display Modes
Old 12-30-2016, 10:16 PM   #1
PDXBryan
Board Member
 
Join Date: Oct 2015
Location: East of Ptld., Or.
Default M47/3.31 vs T5/3.73

I've got a '91 245 5 speed and I think I'll be pretty happy with the gearing once I coax a bit more power from the redblock. I also have a '93 245 autotragic that I'm considering a T5 swap. I won't bore you with the math, but based on my calculations the two tranny/ FD combos end up being quite similar (app. 5% difference) when I theoretically compare 1st gears and overdrives. The T5 I'm considering has the 3.35 1st gear and the .68 overdrive (5.0 Mustang).
So to summarize: Am I correct in thinking the T-5 with 3.73 rear end should perform very similar to the M47 with 3.31 rear end?
PDXBryan is offline   Reply With Quote
Old 12-30-2016, 10:44 PM   #2
Harlard
Pro Sneaker Peddler
 
Harlard's Avatar
 
Join Date: May 2007
Location: PDX
Default

if you swap the .68 overdrive for a .72 yes. Still a bit too tall for cruising around the hillier bits of Portland though.
__________________


Herr Harlard am Erstens

1979 242 DL

Quote:
Originally Posted by t8fanning View Post
My knob has a big chunk of steel on it
Harlard is online now   Reply With Quote
Old 12-30-2016, 10:44 PM   #3
cosbySweater
Board Member
 
cosbySweater's Avatar
 
Join Date: Jul 2009
Location: Monterey/Falun
Default

what are your power goals
__________________
1979 Volvo 244DL 6.0/4l80e,8.8,Ms3x goldbox ecu and Mircrosquirt tcu, s366 clone.
2005 Honda Civic Hybrid, 5 Speed
1991 Volvo 245, so stock it hurts, and I like it that way
1982 Ford Fairmont Futura, 4.8/th400, 8.8, mircrosquirt, 7665 turbo, Project Cheap Thrills

Quote:
Originally Posted by bricktop420 View Post
Thank you very much everybody... i now feel sufficiently retarded and will go cry in the corner...
cosbySweater is offline   Reply With Quote
Old 12-30-2016, 11:09 PM   #4
PDXBryan
Board Member
 
Join Date: Oct 2015
Location: East of Ptld., Or.
Default

If I do stay redblock it will be pretty conservative since I'm looking for good economy too. From looking over the n/a B230 threads I think a torquey 140-ish hp build is pretty reasonable, right?. I think the stock 5sp gearing with this power would make me happy enough especially if I can make it NOT feel and sound like a tractor over 4-6K rpm range.

Thanks
PDXBryan is offline   Reply With Quote
Old 12-31-2016, 01:46 AM   #5
RasAdam_JAHMEN
Board Member
 
RasAdam_JAHMEN's Avatar
 
Join Date: Oct 2014
Location: Jacksonville, FL.
Default

For what its worth, im ditching my 3.31 for something higher. I have an M47 and drift my car with a larger turbo and it feels like a slug until its actually rolling. Takes a second for the wheels to spin.
__________________
_____________________________________________



Build Thread
_____________________________________________
RasAdam_JAHMEN is offline   Reply With Quote
Old 12-31-2016, 03:19 AM   #6
PDXBryan
Board Member
 
Join Date: Oct 2015
Location: East of Ptld., Or.
Default

Quote:
Originally Posted by RasAdam_JAHMEN View Post
For what its worth, im ditching my 3.31 for something higher. I have an M47 and drift my car with a larger turbo and it feels like a slug until its actually rolling. Takes a second for the wheels to spin.
Good to hear from you! Your attitude still blows me away especially after your band"s "big adventure". I can imagine for your purposes going to at least a 3.73 would be a good move. Is your M47 holding up alright?
The bulk of my sideways action will be limited to secluded on-ramps and dirt roads. I'm hoping for the best combination of mpgs and decent performance I can muster. My dream car would be a duplication of the TDI powered 245 I got to drive. It wasn't my car to drift but I could tell, with all that torque, it would've been great at it. TDI swap is definitely in the cards eventually but for the near future I'm starting to lean towards the warmed over 8V.
PDXBryan is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -4. The time now is 12:05 AM.

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2017, vBulletin Solutions, Inc.