I have a 08 XB, Treadstone mani, Precision 50 trim 5031E, Tial 38mm WG (7psi spring), CXR 12" x 12" b&p SMIC, Greddy Type S BOV, 2.5" DP into stock exhaust to TRD axle-back. I have 2x 1910 FICs and a Boomslang PnP harness.

The problem is that the FIC is corrupting the crank signal, causing a P0335 CEL and the car is undriveable with the FIC connected. I've tried both AEM wiring methods (tap CRK & CAM gnds, intercept gnds), no resistors, 2.2k and 4.7k resistors but nothing seems to work. The harness is wired correctly and works flawlessly with the bypass harness in place of the FIC. Boomslang is actually buying a 30-1911 FIC and shipping it to me to test. Rustin at Boomslang has been a great help.

Basically I have 2 questions:

1) Looking for any suggestions to fix the FIC CRK signal corruption

2) How much boost can I run on this setup without any timing retard? I'll be running 93 pump and I have a single stage solenoid triggered water/meth kit that I could install.

The reason for #2 is that I'd like to get the turbo installed while working on a FIC fix. I'm hoping that if I just tap the CRK signal I can get rpm to the FIC and avoid the FIC signal corruption. TIA.

 

i have seen some not take anytiming out till after 8psi on a t3/t4...I dont suggest it though, i personaly retard timing 2-3 degrees at 8psi.

 

Thanks! Are you running WMI? If you're only pulling 2-3 degrees at 8psi, wouldn't WMI negate the need to pull any timing at only 7-8psi?

 

-2-3 degrees at 8psi?

 

i usually pull around 3-4 around there.. but then again its hotta hur!
lol

 

are you saying that with the crank sensor cel pulls timing? if so i guess thats my motivation to try and fix it

 

its been getting cooler lately...i should have mentioned that. today its a high of 73f wooot. tonight should drop quit nicely. temps up to 100f in summer yeah id deff do the same. better safe than sorry imho.

no meth and so far has been ok, Travis is the one who con'd me into getting more aggressive with timing and after a friend of mine ran all summer without any timing retard (he is gentle on the car most of the time though, i suppose thats how he got away with it but still we have made a few runs at the track), so iv gotten a little more ballsy with it. I used to go by the rule of thumb and take out 1degree of timing per 1 psi of boost. ubber slow i might add...lol

going to the track later tonight with Marcial and Carlos. Marcial ign map is i think -3 @ 8psi and temps should drop to low 60's-upper 50's. He should be good but we will keep an eye out on it for sure since its his first time at the track boosted Tc. We will take a few data logs and review em at the pit and make adjustments if needed.

 

Well you know... 07+ the knock sensor will pull very quick..

for example i had a guy who was "tuned" pulling like 4 degrees at wot 8 psi.

I pulled two more degrees and the car was ALOT faster.

 

both marcial and garrett are 06's...id like to get an onboard knock gauge....iv only seen one and no reviews of it...id hate to trust such a thing on something like this.

 

crush do you any msg'er?

id like to chit chat with you mang

 

just had a thought....i wonder if i can configure the fic somehow to read knock from the stock sensor through some creative wiring. hmmmm...wher there is a will there is a way!!!

 

I have yahoo msg

 

its the same screen name as here

 

u have FB? be perfect as the firewall here doent allow me on yahoo or aim without some sneaky work lol!

 

facebook? nope, i got myspace...lol

http://www.myspace.com/crush02342002

 

just pm me

 

or call...bout to head out the door and im off to the track

 

No, the car is completely undriveable with the FIC connected because the FIC is screwing up the crank signal, which sets the P0335. If I just tap into the + crank signal instead of intercepting it, the FIC will still see it but be unable to delay it, thus no timing retard would be possible but the FIC could still control the IDC, MAF and O2.

 

I finally got around to checking more than the crk and cam sensor wiring on the Boomslang harness. They tapped the FIC +12V off the secondary O2 heater circuit. According to Toyota the ECM controls this circuit based on engine coolant temp and load. This would explain why the engine died everytime it saw high load. The FIC was losing power. This probably explains the crk and cam signal problems also. OBD2 freezeframe data for the P0335 shows 0 rpm with the engine running. The FIC lost pwr and the ECU lost it's crk signal.

The original Boomslang harness included the second ECM connector (A36) and tapped FIC pwr from it. I have the second revision harness with only the B33 connector. The only other XB2 I know of that isn't having problems has the original design harness with B33 and A36 ECM connectors and a reliable pwr source for the FIC.

Gonnna test this theory asap.

 

oh wow...