mr2 hks fcd/ fuel cut problems

[mccracing]

I have a 91 mr2 with gen III 3sgte. I put a boost controller on my vehicle to safely raise the boost after performing required upgrades to be able to push 16 psi. I installed the HKS FCD and my fuel cut is still hitting before 16 psi. I found that 13.1 psi of boost is the max that I can get before fuel cut happens. The unit is wired properly... any ideas?

[MR2Jedi]

What number do you have your FCD set to? Doesn't sound like it's working at all..

[mccracing]

its an engine swap to the 3rd gen jdm motor. I have it set at channel 7. this is what hks recommended for the mr2

[MR2Jedi]

I have the same FCD set at 7 too. and it cuts fuel at 17psi. What boost controller are you using?

[mccracing]

the bcu unit that has a turbo timer and lo and hi boost settings. would the boost controller make a difference? my separate boost gauge reads the same psi as the controller

[MR2Jedi]

I'm using the Greddy ProfecII EBC. I have the boost limiter set to 16psi. When boost hits that level, the wastegate is opened to reduce boost. But it doesn't cut fuel. What do you have yours set to ?

[mccracing]

the warn is set at 16 psi the wastegate setting starts to open at 5 psi. fuel cut is hitting at 13 or a little earlier

[MR2Jedi]

Eithet the FCD is not wired correctly(which you said is) Or it just isn't working. Maybe defective.
Are you sure it's fuel cut?

[mccracing]

i triple checked the wiring. may be defective. it is fuel cut because check engine light comes on and pulls a code 34 and resets itself when car is turned off and back on again. should i raise the wastegate setting?

[MR2Jedi]

If WG is opening at 5 psi, how are you getting to 13psi ?

[mccracing]

The boost controller instructions state that the 5 psi setting is where the wastegate staerts to open. i am able to change this setting. The HKS FCD was verified today that it is in working order. I changed the setting to number 9 (toyota supra) and I was able to gain .5 more psibefore fuel cut kicked in and the car idled/accelerated different. Tomorrow i am doing the pressure gauge/voltmeter test

[MR2Jedi]

Sounds like you're on the right track. I " think" the 9 setting is suppose to eliminate fuel cut altogether for the MR2. At least if I remember correctly. My instructions were in japanese, so I called HKS when i was installing my FCD. I thought thats what they told me. That was 3 years ago.