HKS Fuel Cut Defender Problems

[ThirstyMKthrice]

I recently traded my integra for an 89 mkIII turbo. it pwns the integra. anyways... it has the HKS FCD in it and when i go WOT at a lower RPM and i start to boost i feel this lack of power. like im being boosted to my seat and then it stops for about half a second then starts again. one friend told me that there is too much fuel sitting around and to turn the setting to 3 (its at 4 right now) and another one says thats the car trying to fuel cut itself and to up it to 5. im so lost lol. any advice would be much appreciated. the previous owner says he had it tuned and everything but the BOV is hooked up wrong. the boost controller is on wrong. and the vacuum lines....my god.... i cant get passed 9psi until i can find out how to install the boost controller correctly (manual controller) no need for warnings about boosting to much i dont plan on going past 12 right now. oh yeah, i'll list off the other mods incase it ties into the problem of the fuel cut. i got the BOV boost controller 3inch turbo back exhaust and the HKS FCD. thanks everyone. sorry if i kinda went everywhere. i was just spray painting my spoiler and i think i got a bit to much of the fumes lol

 

[a_sesshoumaru]

did you check your codes???

 

[ThirstyMKthrice]

nope, how do i do that? just plug into the diagnostics thing in the bay? with an obd1 scanner i assume? i dont have a CEL on though.

 

[Josh913]

http://www.cygnusx1.net/supra/TechTips/engine_error_codes.aspx


Thanks to Shaeff's courtesy link. I've used this many times

 

[Supracentral]

If you aren't boosting past 12 psi you don't need an FCD.

Remove the MBC and FCD, then get your vac lines routed property. Get your BOV hooked up properly.

Once the car runs correctly, add the MBC back in and get to 12 psi.

The FCD is dangerous in this case, and just removes the only safety the ECU has to prevent you from blowing a motor.

 

[Amtrack]

turn the setting to 3 (its at 4 right now)

Just turn it to 3.

4 is not the correct position!!!

Haven´t you got a manual?

The only FCD from HKS that will work with the 7m-gte is the HKS FCD Type K3 (and no other one!) on position 3.

If you haven`t connected the FCD please do yourself a favour and double (and triple!) check the connections if the former owner hooked it up right.

And yes, if it is wrong it could kill your engine with ease...

 

[NewGen]

I second the post above. Get rid of your boost controller and FCD. Get the car running correctly before you blow it up. NEVER put the FCD back on. Its just bad news. I would recommend if you run into fuel cut to go the lexus afm route and upgrade your fuel system. Thats what I ended up doing on my car. I was going to go with the FCD at first and then herd all the horror stories.

 

[ThirstyMKthrice]

thanks for all the info guys. im gonna set it to three tomorrow when i have some car smart people around that can also double check everything and help with the contoller. earlier i checked my codes and got a 41. the TPS. i took the tps off and found it had a hole on top from a screw being drilled in it and on the underside it had a screw drilled in it. i took the screw out and it still bogs a bit. screw it im gonna go set it to three right now. i'll let you all know how it goes

 

[ThirstyMKthrice]

well i put it to three and the bogging seems to be gone. hope it doesnt come back. i still can't get past 9pounds of boost though....

never mind the bogging is still there just had to test it at high way speeds. the case seems that i have to be below 4k rpm and when i give it full throttle and it starts to boost it just stops, like i said earlier. im being boosted to my seat then it stops for a second and then everything is fine again. id take the fdc and mbc off but im afraid of messing something up. i can do brakes and oil changes and all that alone. but stuff like this id need to wait for my friend to have a day off. unless someone is in the austin area that could help me out. could it also be the code 41 i got earlier? the tps did have 2 screws drilled in it lol

 

[Amtrack]

Disconect the FCD, and all other tuning and start from the really beginning.

If you are sure there are no problems then you can hook up your FCD again.

I recommend an HKS FCD over Lex-Riemer upgrade by far.

Lex-AFM is about 25% bigger than stock, the 550s are about 25% bigger than stock - but it`s everything with "about" and far away from what you call "exact".

I drove my FCD about 3 years with absolutely no problems and I mounted about 15 on other supras - with no problems too.
But be sure you have no problems from the very beginning! Then hook it up right, put it on position 3 and there you go

That:

to boost it just stops, like i said earlier. im being boosted to my seat then it stops for a second and then everything is fine again sounds to me, that your FCD isn`t hooked up right! You are running into the fuel cut.

Take a look at this (or let someone take a look at this who is knowing what to do): http://www.hksusa.com/info/download.asp?id=1793

It´s indeed pretty easy to install an FCD, but you need to double check the wiring colours and connections!

I know I´m repeating myself but it´s REALLY important!

 

[ThirstyMKthrice]

thank you guys so much. youve helped alot. i cant download that pdf till im at my friends. i run windows vista...nothing works with anything. i was already plannin on yanking out everything i have and getting it to run like it just came off the showroom again.

 

[Supracentral]

Disconect the FCD, and all other tuning and start from the really beginning.

If you are sure there are no problems then you can hook up your FCD again.

I recommend an HKS FCD over Lex-Riemer upgrade by far.

Lex-AFM is about 25% bigger than stock, the 550s are about 25% bigger than stock - but it`s everything with "about" and far away from what you call "exact".

Do you even know how an FCD works? It's fixed frequency signal clamp. Meaning that once your AFM reaches a certain level, it "clamps" the signal there and fails to report the greater airflow to the ECU. As your airflow increases, the fuel does not and the car gets leaner and leaner. This is about as far from "exact" as you can get. The Reimer upgrade is damned close, and within the learning capabilities of the ECU. The FCD is exact in one way. It's exactly the perfect way to blow an engine with too much boost.

It's the absolute worst case scenario, and your statements are dangerously ignorant.

 

[suprra_girl]

A fcd in uneducated hands can be dangerous.
I ran mine for a year with no problems. I did hit fuel cut even with the fcd when i tried to run higher boost. I just had too many mods for the fcd to try and clamp. The old big square fcd's imo were better and cut alot later, the one with the dial cuts alot earlier, which is probably a good thing

Without the fcd i would hit fuel cut at 7-8psi, and that was very annoying lol. I installed the fcd, took off my mbc and the stock wastegate went to 9psi and sat there and no fuel cut
I was running 11.7:1 which is a fairly good afr but that was only on 9psi, i'm not sure what was not keeping up for higher boost, i'm thinking it was the stock fuel pump. But hey, i ripped off 280whp on 9psi, i was still happy hehe

What mods have been done to the car?
Intercooler, hardpipes, upgraded ct etc?

 

[ThirstyMKthrice]

i got all the mods listed in my profile

 

[Amtrack]

Do you even know how an FCD works? It's fixed frequency signal clamp. Meaning that once your AFM reaches a certain level, it "clamps" the signal there and fails to report the greater airflow to the ECU. As your airflow increases, the fuel does not and the car gets leaner and leaner. This is about as far from "exact" as you can get. The Reimer upgrade is damned close, and within the learning capabilities of the ECU. The FCD is exact in one way. It's exactly the perfect way to blow an engine with too much boost.

It's the absolute worst case scenario, and your statements are dangerously ignorant.

Well,

I have driven my FCD, F-Con setup for about 3 years - yes, I know how an FCD works and I never told him to get past 0,8bar without any gauges to check that your engine runs healthy.

After that I stepped up to a VPC and was running that for about a year.

After that I went to eManage ultimate which is currently running without MAF, yes - I know what I´m doing

With Lex-Riemer you will get a Fuel Cut at about 1,5bar with a T66 Turbo (tested that myself), with an FCD you will get NO fuel cut at any point (that counts only for the newer style FCD type K3) - but theat means that you have to know what you are doing, otherwise you will kill your engine. I copy that point with you.

If you`re planning on running some bigger numbers, you WILL have to get another management system because you will get FC with Lex-R...

 

[Supracentral]

What you said was "I recommend an HKS FCD over Lex-Riemer upgrade by far." - which is saying I suggest you remove all safeties from your ECU rather than work with them.

I've gotten 622 RWHP from a Lexus AFM, 850cc injectors and an APEXi S-AFC running on C-16. I have NEVER used a FCD in any 7M powered Supra. They are, in my opinion, dangerous and unnecessary with these cars. That was almost 10 years ago.

With Will Neelys car we hit 733 with a the VPC & S-AFC combo. A good number of "big power" Supras got worked on in my driveway back then...

Fuel cut isn't a "nuisance" problem. Fuel cut is the computer telling you that you are off the end of the fuel map.

Today there are far better engine management solutions available and I wouldn't push components like that up into those levels now.

But the FCD is never necessary on a 7M, and always dangerous.

 

[MRSUPRA]

If you do get a FCD, make sure you are monitoring the air/fuel ratios. I have been running an FCD for years along with my LEX afm and AFC. On my car, I would get lean at around 25psi with no way to adjust for more fuel. It was fine at 24psi and about 485rwhp, but after that I believe the AFM frequency was leveling out with the FCD and the ECU could no longer see a change.

If I could start over, I would just go with MAFT or MAFT-pro. I don't even feel like installing my AEM.

 

[NewGen]

The FCD is just not worth the risk. Especially if you dont no what your doing. I'm running 15 psi on my Lexus afm and I've never hit fuel cut. I just think its a smarter way to go because your fuel cut is still there so you kinda have a safety net. You'll have to buy other supporting mods with it thought like a wide band and SAFC to control the fuel because the lexus afm wants to run rich because its allowing more air in.

 

[Sawbladz]

The three step program to increased reliability.

1) Remove HKS FCD.
2) Place FCD on driveway.
3) Back over FCD.

 

[ThirstyMKthrice]

The three step program to increased reliability.

1) Remove HKS FCD.
2) Place FCD on driveway.
3) Back over FCD.

lmao sounds like a decent plan