FCD, JDM DP 90 Turbo 2
03-07-24, 09:12 AM
#1
FCD, JDM DP 90 Turbo 2
Been awhile but I just picked up a mint 90 model T2. All stock. Looking to delete the pre-cat with a jdm dp i have laying around from long ago. As I recall the JDM dp does not bolt up top the usdm cat? So I plan on deleting the cats all together and installing a FCD and keep the exhaust as close to 2.5'' to help with boost control. That being said I cant remeber if this setup is safe or should I upgrade the secondary's and pump? Thanks in advance.
03-07-24, 12:24 PM
#2
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JDM downpipe will bolt right up to the main cat, and that should just work fine.
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re-rx7 (03-07-24)
03-07-24, 02:19 PM
#5
Some good reading material. https://www.rx7club.com/2nd-generati...stion-1000680/
03-07-24, 02:25 PM
#6
The FCD doesn't cause a lean condition the overboost does and from what I can remember anything over 8.5psi is basically a static map in the ecu. FCD on a S5 us usually safe from what i recall. The S4 not so much. The go to back in the day was a FD pump, FCD, Turboback. The fd pump bumped the base FP up for safety. Some just upgraded the secondarys to 720cc and left it at that with the FCD. Rich? yes. Safe? absolutely.
I didnt know the USDM and JDM main cat was the same though. Interesting.
I didnt know the USDM and JDM main cat was the same though. Interesting.
03-07-24, 02:51 PM
#7
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in 2024 if you need to run more boost than fuel cut, you'd be way ahead by getting an ecu that is tunable.
however if you had a setup that maybe hit fuel cut on a cold day or something, then its ok, i don't know that i would buy one though.
however if you had a setup that maybe hit fuel cut on a cold day or something, then its ok, i don't know that i would buy one though.
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re-rx7 (03-07-24)
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Relisys190 (03-09-24)
03-07-24, 03:46 PM
#9
I was going to say more fuel and at least a safc would help.
When I had a safc, I used the boost pressure sensor as the throttle input to the safc so fuel adjustments would be based on rpm and boost level. I got the idea from the DSM guys doing it with success.
I’d sit on that for a bit as a potential solution in your case.
At that point a stand-alone would get the job done the right way.
I haven’t messed with any of the new standalones since haltech e6x. Im currently running a power-fc and have yet to try the fc-tweak self tuning software for power fc (I just need to stop being lazy). But I hear great things about the software and turns the power fc into an inexpensive option.
When I had a safc, I used the boost pressure sensor as the throttle input to the safc so fuel adjustments would be based on rpm and boost level. I got the idea from the DSM guys doing it with success.
I’d sit on that for a bit as a potential solution in your case.
At that point a stand-alone would get the job done the right way.
I haven’t messed with any of the new standalones since haltech e6x. Im currently running a power-fc and have yet to try the fc-tweak self tuning software for power fc (I just need to stop being lazy). But I hear great things about the software and turns the power fc into an inexpensive option.
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re-rx7 (03-07-24)
03-07-24, 04:23 PM
#10
I was going to say more fuel and at least a safc would help.
When I had a safc, I used the boost pressure sensor as the throttle input to the safc so fuel adjustments would be based on rpm and boost level. I got the idea from the DSM guys doing it with success.
I’d sit on that for a bit as a potential solution in your case.
At that point a stand-alone would get the job done the right way.
I haven’t messed with any of the new standalones since haltech e6x. Im currently running a power-fc and have yet to try the fc-tweak self tuning software for power fc (I just need to stop being lazy). But I hear great things about the software and turns the power fc into an inexpensive option.
When I had a safc, I used the boost pressure sensor as the throttle input to the safc so fuel adjustments would be based on rpm and boost level. I got the idea from the DSM guys doing it with success.
I’d sit on that for a bit as a potential solution in your case.
At that point a stand-alone would get the job done the right way.
I haven’t messed with any of the new standalones since haltech e6x. Im currently running a power-fc and have yet to try the fc-tweak self tuning software for power fc (I just need to stop being lazy). But I hear great things about the software and turns the power fc into an inexpensive option.
03-08-24, 08:33 AM
#11
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the Power FC has a new thing for it called FC Tweak, and its new interface box, and it is really good.
the important thing is the auto-tuning which works amazingly well
that being said, with just a JDM down pipe it might not even hit fuel cut at all
the important thing is the auto-tuning which works amazingly well
that being said, with just a JDM down pipe it might not even hit fuel cut at all
03-08-24, 10:03 AM
#12
Im looking at buying the PFC from bonzai. I havent heard about the new auto-tune feature Ill have to look into that. However, If I can get away with the DP and a FCD i may just do that. Worst case maybe pick up a AFC and a WB. Side question, The turbo to DP gasket is hard to find, I now its metal should i bite the bullet and pick one up for 75$?
03-08-24, 11:51 AM
#13
Senior Member
The FCD doesn't cause a lean condition the overboost does and from what I can remember anything over 8.5psi is basically a static map in the ecu. FCD on a S5 us usually safe from what i recall. The S4 not so much. The go to back in the day was a FD pump, FCD, Turboback. The fd pump bumped the base FP up for safety. Some just upgraded the secondarys to 720cc and left it at that with the FCD. Rich? yes. Safe? absolutely.
I didnt know the USDM and JDM main cat was the same though. Interesting.
I didnt know the USDM and JDM main cat was the same though. Interesting.
03-08-24, 12:00 PM
#14
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Im looking at buying the PFC from bonzai. I havent heard about the new auto-tune feature Ill have to look into that. However, If I can get away with the DP and a FCD i may just do that. Worst case maybe pick up a AFC and a WB. Side question, The turbo to DP gasket is hard to find, I now its metal should i bite the bullet and pick one up for 75$?
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re-rx7 (03-08-24)
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