rear iron casting differences
03-08-17, 09:33 PM
#1
rear iron casting differences
Im pretty sure this has been either covered or posted on before, and i have tried searching using multiple tag lines for a while now, but still cant find the answer im looking for.
Simply put, in regards to the S4 vs S5 rear irons, Was it only the turbo 4 port blocks that were revised in the later years for the thicker/reinforced casting around the dowel, or do the newest castings for the S5 6 port rear irons also have the thicker/reinforced areas as well?
The reason i am posting, is because, sure... the 185whp S4 6 port I was running was fun, but i am now on the quest for some more torque. The turbo i will be running can likely push my S4 rear iron to the quoted "limits" for RWP durability and I would prefer to take a proactive stance if possible before I potentially destroy the rear iron and end up killing other still good internals in the process
Simply put, in regards to the S4 vs S5 rear irons, Was it only the turbo 4 port blocks that were revised in the later years for the thicker/reinforced casting around the dowel, or do the newest castings for the S5 6 port rear irons also have the thicker/reinforced areas as well?
The reason i am posting, is because, sure... the 185whp S4 6 port I was running was fun, but i am now on the quest for some more torque. The turbo i will be running can likely push my S4 rear iron to the quoted "limits" for RWP durability and I would prefer to take a proactive stance if possible before I potentially destroy the rear iron and end up killing other still good internals in the process
Last edited by Sgt.Stinkfist; 03-08-17 at 09:41 PM.
03-08-17, 09:36 PM
#2
all new cast irons from mazda have been updated as far as i know, so if you get a brand new rear iron it should be updated, that includes the non turbo 6 port engines.
for what factory engines have the thick rear dowel, initially it was only on S5 turbo 4 port blocks and it was actually still a rarity to find them on the S5 turbo engines(late production being key). people still tend to think that ALL S5 turbo rear irons are revised and have the thick casting, which is FALSE.
for what factory engines have the thick rear dowel, initially it was only on S5 turbo 4 port blocks and it was actually still a rarity to find them on the S5 turbo engines(late production being key). people still tend to think that ALL S5 turbo rear irons are revised and have the thick casting, which is FALSE.
03-08-17, 09:47 PM
#3
thats the one truth ive been coming across, actually based mainly on the posts ive come upon via you, that not all S5's are the much desired "thick castings". TMW illl be calling up mazda motorsports and see if i can get them to send me out a revised 6 port rear iron, and then port match it to my front iron.
I have also come across a few posts about revised front irons which were stronger and also had thicker castings. is that true as well, and does it also cover 6 port stuff?
I have also come across a few posts about revised front irons which were stronger and also had thicker castings. is that true as well, and does it also cover 6 port stuff?
03-08-17, 09:51 PM
#4
thats the one truth ive been coming across, actually based mainly on the posts ive come upon via you, that not all S5's are the much desired "thick castings". TMW illl be calling up mazda motorsports and see if i can get them to send me out a revised 6 port rear iron, and then port match it to my front iron.
I have also come across a few posts about revised front irons which were stronger and also had thicker castings. is that true as well, and does it also cover 6 port stuff?
I have also come across a few posts about revised front irons which were stronger and also had thicker castings. is that true as well, and does it also cover 6 port stuff?
i tended to get the lower end of the pool for builds, so i cannot verify that the 6 port irons in fact are revised with the thick castings. maybe j9fd3s could give you some verification on that one. very few of my customers felt like spending anything more than the bare necessities, so used parts it was.
03-08-17, 10:02 PM
#5
I hear ya, ill send J9 a PM and see if he can verify a few of these things for me. Im not rich by any means, but membership with mazda's motor sports development definitely helps make things financially easier to do right the first time. Im just hoping I can make a good reliable pairing with my decently performing 6 port setup plus a BW S360
03-09-17, 08:17 PM
#7
so i talked to mazda motorsports and got no worthwhile info, but from digging through hundreds of pictures i can conclude that yes, the S5 6 port rear iron has at minimum the extra reinforcing rib cast into the dowel area like the S5 turbo iron. Im just gonna bite the bullet and buy the newest production version of a S5 6 port rear iron from mazda, and who knows. maybe ill get one with the ultra wide FD style casting too 
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03-09-17, 11:32 PM
#8
here's an example of the typical 1st generation "thick iron"
the reinforcement rib showed on early S5 turbo irons and was replaced in late model ones with an actual update to a thicker casting.
the rib does very little, so i don't even consider it an upgrade.
pics stolen from a fleabay listing.
the reinforcement rib showed on early S5 turbo irons and was replaced in late model ones with an actual update to a thicker casting.
the rib does very little, so i don't even consider it an upgrade.
pics stolen from a fleabay listing.
03-09-17, 11:45 PM
#9
I guess something is better than nothing, but I'll be the guy who puts his money on the line and whatever I get from mazda, I'll post in this thread and confirm with 100% real world results on whatever they send. Based on my parts availability list via mazda motorsports the S5 6 port rear iron is on backorder, so if/when it arrives I can say that it will be the newest possible production version. Hopefully, whatever it is can hopefully add to some insight for those who want to go the 6 port NA-T route with the most strength