13bt and 13b-rew map difference?
 

I was looking at himan's site for a map for my 87 Turbo II. Is there a difference between 13bt maps and 13b-rew ones? Can I use a 13b-rew map on a 13bt?

Ryan

ignition setup is different, so you would have to change some values.

Do you mean just the values on the timing map or is the ignition setup itself different? I dont really know the specific differences between the two engines. Just that the 13b-rew is built stronger....

Thanks,
Ryan

there is almost no difference internally on the two engines. what exactly is stronger?

the ignition setup on the second gen CAS and the third gen CAS is different. the values could be interchanged

I thought the housings were thicker or mabe the compression was lower. Something like that...I havent really checked out the differences....anyways, thanks.

i once read that the casting around the dowl pins is thicker on the REW, also the sparkplugs are at diff locations changing the timming

Re: 13bt and 13b-rew map difference?
 

Probably be slightly richer under boost and perhaps slightly leaner under vacuum I suspect. The 13BREW has smaller primary port outlets but larger secondary port outlets. It also has a different thrust bearing/plate setup over the older FC motor, has a different oiling system (gear bearings and pressure regulator), machined rotors vs. cast, and has thicker iron around the rear iron dowel pin. There are many more differences.

B

now I have had several of these motors apart and have replaced many of these items and I can tell you that yes the rotors are different on the '93 and newer engines(still cast but lighter and slightly higher compression than TII), rear end plate dowel casting maybe larger but this is on all newer parts from Mazda or it is just a different company doing the casting and it is not a dramatic difference and will break easily like the early models( I have broken this particular piece myself and had to replace it with a new piece from Mazda). oil pump is the same as the TII, but the regulator is set for a higher pressure(basicly a different spring). thrust bearing I am not sure of but the pieces are all interchangeable. I have run my 13b turbo II motor with TII front and center plates(cast iron parts), eshaft, front cover, oil pump, flywheel and counter weight and '93 rotors, rotor housings, rear end plate, oil pressure regulator. I am not sure about stock port sizes(as mine were all hand ported). lots of parts have been updated by Mazda over the years for all models, so if you buy new parts you will get these updates. but the newer engine is not a stronger unit by any measureable margin.

I found this..
http://my.engr.ucdavis.edu/~pko/13BTvs13BREW.html

So far I havent heard of any differences that would stop me from running an s6 base map on my 13bt other then the differences in the 13b-rew's igniton setup. From what I understand, I just have to go to the Igniton Setup page, change the values to match those of a stock 13bt with my timing method (hitman's) and it should work good enough to get me to the dyno...but first I need to get a Haltech TPS....

Ryan