fcd...
Thread Starter
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2nd Gear
Joined: Oct 2007
Posts: 1,196
From: Over There
fcd...
cincy you just may be the first to answer
I have read some of the guys on here rather than using a chip they sauder (spelling) a diode in somewhere... i have a DIY bookmarked what they do... If i do go the route of a TT it will for sure be awd but 180 or 225 i'm still not sure. A 180 is more in my price range. The 225 nobody knows of a diode to use??? Anyway, after 1 bar the ecm throws itself in to a safe mode or a limp mode. The toyota including many other cars use a fuel cut defender. My brothers 3sgte has fuel cut after 1 bar without this. I dont know that his ecm goes into a limp mode but i do know if he didnt have it he would have quite a bit of detonation. So my question is, does anyone on here use a fcd instead of the diode mod or a chip? or no...
I know on the mr2 you can either go that route, go with some sort of stand alone, or t/plug a vauum. Just a question, i didnt really see anything about it anywhere.
thank you
I have read some of the guys on here rather than using a chip they sauder (spelling) a diode in somewhere... i have a DIY bookmarked what they do... If i do go the route of a TT it will for sure be awd but 180 or 225 i'm still not sure. A 180 is more in my price range. The 225 nobody knows of a diode to use??? Anyway, after 1 bar the ecm throws itself in to a safe mode or a limp mode. The toyota including many other cars use a fuel cut defender. My brothers 3sgte has fuel cut after 1 bar without this. I dont know that his ecm goes into a limp mode but i do know if he didnt have it he would have quite a bit of detonation. So my question is, does anyone on here use a fcd instead of the diode mod or a chip? or no...
I know on the mr2 you can either go that route, go with some sort of stand alone, or t/plug a vauum. Just a question, i didnt really see anything about it anywhere.
thank you
2nd Gear
Joined: Jan 2007
Posts: 1,345
From:
RE: fcd...
ORIGINAL: myslow1
cincy you just may be the first to answer
I have read some of the guys on here rather than using a chip they sauder (spelling) a diode in somewhere... i have a DIY bookmarked what they do... If i do go the route of a TT it will for sure be awd but 180 or 225 i'm still not sure. A 180 is more in my price range. The 225 nobody knows of a diode to use???Ithas been done on a 225, I believeits just hard to find the right diode but there out there somewhere.Anyway, after 1 bar the ecm throws itself in to a safe mode or a limp mode. The toyota including many other cars use a fuel cut defender. My brothers 3sgte has fuel cut after 1 bar without this. I dont know that his ecm goes into a limp mode but i do know if he didnt have it he would have quite a bit of detonation. So my question is, does anyone on here use a fcd instead of the diode mod or a chip? or no...
I know on the mr2 you can either go that route, go with some sort of stand alone, or t/plug a vauum. Just a question, i didnt really see anything about it anywhere.
thank you
cincy you just may be the first to answer
I have read some of the guys on here rather than using a chip they sauder (spelling) a diode in somewhere... i have a DIY bookmarked what they do... If i do go the route of a TT it will for sure be awd but 180 or 225 i'm still not sure. A 180 is more in my price range. The 225 nobody knows of a diode to use???Ithas been done on a 225, I believeits just hard to find the right diode but there out there somewhere.Anyway, after 1 bar the ecm throws itself in to a safe mode or a limp mode. The toyota including many other cars use a fuel cut defender. My brothers 3sgte has fuel cut after 1 bar without this. I dont know that his ecm goes into a limp mode but i do know if he didnt have it he would have quite a bit of detonation. So my question is, does anyone on here use a fcd instead of the diode mod or a chip? or no...
I know on the mr2 you can either go that route, go with some sort of stand alone, or t/plug a vauum. Just a question, i didnt really see anything about it anywhere.
thank you
3rd Gear
Joined: Nov 2005
Posts: 2,749
From: fort wayne IN
RE: fcd...
i know what you are talking about with the Toyotas "fuel cut"...i have experienced it in my buddys MKIV supra...its very similar to out "limp mode" as far as i know we dont have a fuel cut system or therefore a mode to do so. the supra hits fuel cut when it boosts above 14psi without using a boost cut controller.
I'm make believe
Joined: Dec 2006
Posts: 17,587
From: In my head
RE: fcd...
yes you can use a diode on a 225, the only differance is that on a 180 you use a mbc to raise the boost and the 225 you use a mbc to limit the boost. You will be safe to to run 18-20psi. There is no need for a fcd on a 1.8t.
also most people use a fcd for when they rev past stock limits and the fuel cut off is just before that. This lets them now rev higher. Least from what im use to with a fcd
also most people use a fcd for when they rev past stock limits and the fuel cut off is just before that. This lets them now rev higher. Least from what im use to with a fcd
Thread Starter
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2nd Gear
Joined: Oct 2007
Posts: 1,196
From: Over There
RE: fcd...
sweet i didnt know that a fcd did anything to help with higher revs.
So if they dont make a fcd for a tt it wouldnt matter. You just buy one from somewhere like hks and get a wiring schematic for your harness and put it in.
Putting a diode into a 180 raises the boost to 18ish psi with no limp mode. On a 225 it makes the boost go to whatever and you need a mbc to lower it? Do these diodes change a setting in the ecm to allow more boost and keep the wastegate open longer or what? Just running a loop to trick the ecm?
So if they dont make a fcd for a tt it wouldnt matter. You just buy one from somewhere like hks and get a wiring schematic for your harness and put it in.
Putting a diode into a 180 raises the boost to 18ish psi with no limp mode. On a 225 it makes the boost go to whatever and you need a mbc to lower it? Do these diodes change a setting in the ecm to allow more boost and keep the wastegate open longer or what? Just running a loop to trick the ecm?
I'm make believe
Joined: Dec 2006
Posts: 17,587
From: In my head
RE: fcd...
With a 4.3v diode, the ecu is limited to seeing 11psi from the map. Since it never sees more than 11psi, you wont hit limp for the boost passing 1bar. With a 180 it isnt a problem since thats all the map sends to the ecu, so you need a mbc to increase the boost. With a 225, the n75 wont ever see higher than 4.3v's (4.3v = 11psi) so the boost wouldnt ever be limited so it will continue to boost and you needa mbc to limit it. The maf and o2 sensors will then correct for the increase in airflow due to the increase in psi.
I'm make believe
Joined: Dec 2006
Posts: 17,587
From: In my head
RE: fcd...
people swap n75's for a couple more psi or add in a mbc so they can have full control of the boost. If you use a diode, you need a mbc and perferably a nice one. Also it with or just a bleed valve is a HUGE plus.
