Twin turbos- fd 13b vs cosmo 20b
Help please!
Does anyone know how different the twin turbos are between a Cosmo 20b and a s8 fd rx7? The seals have crapped out on the fd twins n it's blowing lotsa smoke on deceleration and at low idle. Burning oil! I have the 20b twins still n was thinking maybe I can just swap em out. Put the 20b turbos onto the fd turbo manifold etc. Anyone here looked at these side by side? I'm about to buy secondhand fd turbos tomorrow for $200, but they may have the same problem in a month or so, they have 70,000km on them and these ones in the s8 have 77,000km. The fd is auto n it's the gfs car, she don't want it to go faster, just reliable and not embarrassingly smoking everyone out. Ps I've been looking for hrs for an answer. Grrrr |
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all of the factory turbos are made by hitachi.
the 13B cosmo uses a pair of HT-10's the FD uses a pair of HT-12's, and then the 280hp version uses an HT-12 with abraidable seals. the 20B uses an HT-15 and HT-10 the FC used a single HT-18. |
Originally Posted by j9fd3s
(Post 11852849)
all of the factory turbos are made by hitachi. the 13B cosmo uses a pair of HT-10's the FD uses a pair of HT-12's, and then the 280hp version uses an HT-12 with abraidable seals. the 20B uses an HT-15 and HT-10 the FC used a single HT-18.
Like the 20bs will not fit I the Fd's manifold? |
Originally Posted by SiNfidelity
(Post 11852954)
So would the footprint for each be too different, to be interchangeable?
Like the 20bs will not fit I the Fd's manifold? |
Ok next question.
Has anyone on here ever fitted 20b turbos to fd engine? The ht15 seems like a nice choice for the twin turbo secondary |
K. Thanks for the info guys.
I need to find a low kms set of twins then. Damn. It's just the gfs car so not after big power. Think she may sell it n keep her rx8 instead. Chuck a baby turbo on it etc |
FD turbos can last so don't worry about 70k km's, turbo life span is all over the place.
When I first got my FD the turbos failed at about 45k miles. I put a set on with 110k miles (never rebuilt) and they lasted me another 50k miles. I replaced them because I thought they were making noise but it ended up being something else, they still looked fine. |
Will s6-7 turbos easily fit s8? I found some twins with low Kms and no shaft play but guy not sure what series they are.
I have heard there are some minor differences . Maybe I can swap the actual turbos off the manifold and keep s8 manifold waste gates and vac lines etc? Any help/opinions greatly appreciated as I really need to fix the fd ASAP.. The front turbo has so much play side to side. |
Originally Posted by SiNfidelity
(Post 11857541)
Will s6-7 turbos easily fit s8? I found some twins with low Kms and no shaft play but guy not sure what series they are.
I have heard there are some minor differences . Maybe I can swap the actual turbos off the manifold and keep s8 manifold waste gates and vac lines etc? Any help/opinions greatly appreciated as I really need to fix the fd ASAP.. The front turbo has so much play side to side. they both use the same exhaust manifold and intake pipes and stuff, so either one will fit any FD engine. the 280ps turbos use a bolt on compressor housing, and the others have a snap ring. |
Beauty! Thanks for that. We are selling it so I just need it running.
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Is it too hard to pull the twins off without removing the engine?
I know the 20b cosmo was impossible but maybe the fd is easier?? |
Originally Posted by SiNfidelity
(Post 11855431)
K. Thanks for the info guys.
I need to find a low kms set of twins then. Damn. It's just the gfs car so not after big power. Think she may sell it n keep her rx8 instead. Chuck a baby turbo on it etc if you are looking for good condition twins , get in contact with Fritz Flynn I'm sure he has a good set of low millage twins . |
Originally Posted by SiNfidelity
(Post 11857840)
Is it too hard to pull the twins off without removing the engine?
I know the 20b cosmo was impossible but maybe the fd is easier?? Make sure you drain the oil , and loosen the oil / water feed to teh turbos as well . WHEN YOU TAKE HTE TURBOS OUT THIS IS VERY IMPORTANT !! CAREFUL NOT TO BEND THE OIL RETURN LINES FOR THE TURBOS ! OTEHR WISE RE ALIGNING THEM WILL BE A PAIN IN THE ASS |
Great advice thanks
I'm lucky it's a 2000 model, so the shield bolts were a breeze and by the looks of the remaining bolts I doubt any will give me problems. When u say drain oil, from sump or just from turbos? |
Oil drains in from the turbos above the oil pan, as long as you aren't overfilled or have the front jacked up at some crazy angle you shouldn't have to drain the oil. It's not a bad idea to drain it anyway since you have it up in the air and it's probably less messy than finding out you were overfilled while you are removing turbos.
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Originally Posted by SiNfidelity
(Post 11859116)
Great advice thanks
I'm lucky it's a 2000 model, so the shield bolts were a breeze and by the looks of the remaining bolts I doubt any will give me problems. When u say drain oil, from sump or just from turbos? But as tom said , i guess you do not have to drain the oil. |
Thought I better post that the turbo change was fairly easy. Being a 2000 model meant the bolts weren't totally corroded etc.
Put car as high on ramps as I could n that's about it. Trying to get the turbos back on, complete with gaskets was a little tricky. I did break the rear top bolt between turbo manifold and exhaust manifold when putting it back together, but at that stage I couldn't be fked ripping it apart again. So far it's holding up, no leaks, but I'm guessing it's a matter of time!! When it goes I'll convert to a single. Thanks for the advice peeps |
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