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Old 06-09-2019, 07:03 PM   #1
BoostedBlue
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Boosting my 325i! What trans and diff??!?

Hello peeps! As you'll see this is my first post here so i'm sorry if my knowledge of these cars is little to none right now!

I recently bought a 5-speed manual 2002 325i, so it has the M54B25. I got this car for a daily/toy so I don't abuse my corvette to much lol! I have been doing a lot of video watching and thread reading into turboing this car and I figured the best way to get specific answers is to just ask.

Goal for now 300-350whp

For now I will be ordering:
  • CX Racing top mount kit (8-10psi)
  • 0.120" MLS head gasket
  • ARP Studs
  • KSM 650CC Injectors
  • Aero 340LPH Pump
  • Aero fuel pressure reg.
  • AEM piggyback ECU w/ FIC6

Goal after engine is built is 600-700WHP
So I plan to build the engine with forged Rods/Pistons and ARP hardware, and high grade main and rod bearings. I will try to find lower compression pistons because I am aware this engine is high compression.

My main question to you all is obviously at that HP/TQ the trans and diff are going to grenade sooner rather than later, so what transmission swaps are available to me? Are there kits that can mate other trannys to this engine? Are there company's that can beef up the stock getrag 5-speed?
Same for the rear end, can you guys give me some good choices or solutions for holding 600-700WHP?

Thanks!!
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Old 06-09-2019, 07:19 PM   #2
armenh7
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My Ride: 2002 325i
A 330 manual trans will hold more torque than a 325 one
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Old 06-10-2019, 09:12 AM   #3
BoostedBlue
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So far from what I found my best option is a ZF320 swap. Is this correct or is there a more torque durable option?
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Old 06-11-2019, 12:58 AM   #4
armenh7
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My Ride: 2002 325i
Quote:
Originally Posted by BoostedBlue View Post
So far from what I found my best option is a ZF320 swap. Is this correct or is there a more torque durable option?
That is correct. A getrag 420g from a E46 M3 might be able to handle but costs more. A new option that is gaining popularity in the boosted E36 world is a N54 335i manual transmission swap.
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