Opinions on S5 6 port swap?
07-21-12, 10:49 PM
#28
my old build thread is here
https://www.rx7club.com/build-thread...t-pics-966618/
lots of other smaller things have been done and tweaks made that arent in the thread, so any questions feel free to ask.
Basically it was an '86 6 port 13b from my old FC. Motor was pulled apart and rebuilt using goopy performance apex seals with all new seal springs, and FD corner seal springs, mazda competition oil seal springs and new oil control seals/o-rings, (re-used the side seals and corner seals w/ new springs as well, as they were still in spec, and just put them back in their original locations. Replaced to worn out NA housings with a pair or good condition S5 turbo housings, and ported the irons and housings using some pineapple racing templates as a guide, and expanded on them a little.
The 6 port actuater mechanism was pulled out of the manifold and and sealed off with freeze plugs and JB weld. In the 5th and 6th ports on the irons I used goopy performance inserts which replace the sleeve and give a smooth flow into the port, similar to pineapple sleeve inserts, sans the sleeve itself. i opened up, smoothed and port matched the TB, TB to plenum, plenum to UIM, and UIM to LIM, and stripped the TB down to its bare essentials.
Exhaust is a modified RB header for a 12A, with the flange split to fit the 13B block and ported the header primaries entrance at the flange to match the S4 exhaust ports better. the collector was also chopped off, and I ran dual 2" pipes all the way back to the RB dual inlet muffler for an ultra long primary style system.
lastly, fuel system is pretty much stock "new" 460 injectors and an inline walbro 255 which bumps fuel pressure to ~40-42psi instead of the stock 35ish.
and not really related, but also using my older 215mm clutch/RB flywheel setup w/ my S4 counterweight
https://www.rx7club.com/build-thread...t-pics-966618/
lots of other smaller things have been done and tweaks made that arent in the thread, so any questions feel free to ask.
Basically it was an '86 6 port 13b from my old FC. Motor was pulled apart and rebuilt using goopy performance apex seals with all new seal springs, and FD corner seal springs, mazda competition oil seal springs and new oil control seals/o-rings, (re-used the side seals and corner seals w/ new springs as well, as they were still in spec, and just put them back in their original locations. Replaced to worn out NA housings with a pair or good condition S5 turbo housings, and ported the irons and housings using some pineapple racing templates as a guide, and expanded on them a little.
The 6 port actuater mechanism was pulled out of the manifold and and sealed off with freeze plugs and JB weld. In the 5th and 6th ports on the irons I used goopy performance inserts which replace the sleeve and give a smooth flow into the port, similar to pineapple sleeve inserts, sans the sleeve itself. i opened up, smoothed and port matched the TB, TB to plenum, plenum to UIM, and UIM to LIM, and stripped the TB down to its bare essentials.
Exhaust is a modified RB header for a 12A, with the flange split to fit the 13B block and ported the header primaries entrance at the flange to match the S4 exhaust ports better. the collector was also chopped off, and I ran dual 2" pipes all the way back to the RB dual inlet muffler for an ultra long primary style system.
lastly, fuel system is pretty much stock "new" 460 injectors and an inline walbro 255 which bumps fuel pressure to ~40-42psi instead of the stock 35ish.
and not really related, but also using my older 215mm clutch/RB flywheel setup w/ my S4 counterweight
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