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Cosmo 13b-tt Or Fd 13b-tt Whats Better

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Old 06-10-2004 | 11:08 PM
  #1  
RageX^NZ's Avatar
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From: Mount Maunganui, New Zealand
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Hi All,



After my current project I am going to build a 13B for a bit of road racing and was wondering what will be the better for modification.



From my understanding the 13B cosmo engine and the FD are almost identical apart from the cosmo engine being automatic has the counterweight on the end of the eccentric shaft and the cosmo's inlet manifoild is apparently better.



I am planning on converting the engine to a single garrett turbo with a custom made exhaust manifold and using Microtech engine management. I am also looking at water injection systems such as the one available from PINZ in Auckland. From reading the threads in here upgrading the coolant seals to Banzai's ones and possibly using carbon apex seals will increase the longetivity of the engine as well.



I am unsure of what porting I will use. Some more research will need to be conducted on my part, but being used for track work it will need to have good midrange torque just to get some decent acceleration out of the corners onto the straights.



It will probably be going into a rear engined kit car that is usually fitted with a Subaru EJ20T so if anyone has any suggestions for a good transaxle for competition use that would be good as well.
Old 06-11-2004 | 12:59 AM
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Leetheslacker's Avatar
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The cosmo has larger ports compared the the FD motor stock.
Old 06-11-2004 | 01:19 AM
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these two threads might be helpful https://www.nopistons.com/forums/ind...howtopic=26278 https://www.nopistons.com/forums/ind...howtopic=14153
Old 06-11-2004 | 01:12 PM
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inmo there is no need to go for teh cosmo stuff on a turbo car unless you are planning to go over 500hp or so. porting should be chosen with HP goal in mind, so when you figure out how much power u want you can then choose a proper port.
Old 06-13-2004 | 01:31 AM
  #5  
RageX^NZ's Avatar
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Thanks for the info guys,



I am going to source a Cosmo 13B-RE and rebuild it starting this September. Main reasons being that:



1. It's cheaper than a 13B-REW by NZ $1000

2. It has better high end

3. Can be bolted straight into an FC and FC's are "dime a dozen" in NZ





We are looking for around 400 to 450rwhp but I realise that being our first rotary build we most likely will not get anywhere near this.



So far on the must buy list are:



Atkin's Rotary Rebuild video

Tweakit Lightened Flywheel

either Garrett GT40 or Blitz 660R

Banzai's water seals

TurboSmart Wastegate

Microtech ECU (Unless anyone has any better reccomendations)
Old 06-13-2004 | 02:05 AM
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Could always go with the Haltech
Old 06-13-2004 | 03:57 AM
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Cosmo side plates and intake manifold. FD rotor housings. Everything else is up to you.
Old 06-13-2004 | 02:09 PM
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Is there a difference between Cosmo and FD housings becides the sleeves?
Old 06-13-2004 | 02:39 PM
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Originally Posted by setzep' date='Jun 13 2004, 11:09 AM
Is there a difference between Cosmo and FD housings becides the sleeves?
dont think so
Old 06-13-2004 | 03:34 PM
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Some might say the FD housings are stonger, but I honestly don't know.


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