Boro

iTrader: (1)

A mate has a 2004 blobeye WRX which he bought with a turbo back decat system as the only mod. He's since fitted a HKS FMIC and electronic boost controller set to 0.8bar. Is it safe to run with the additional FMIC without a remap?

BlueBugEye

iTrader: (12)

Out of interest why is his boost controller at 0.8? I'm running a Turbo back 3' and decat up-pipe and I get over 1.2 Bar, this is with an ECUTek remap - has his been mapped to the exhaust yet? I'd not recommend changing the exhaust without a remap.

There's no real need for a FMIC until you go over 450BHP as all it will do is introduce lag as the turbo has more air to compress to get any boost due to the greater volume of air in the system - A FMIC is less prone to heat soak though, however is is worth it for the additional lag?

dunx

iTrader: (3)

I ran for a month or two, it went well, but no drive it like you stole it antics. Worth it ? Oh yes, mine wilted in normal road use in the summer.

[I.M.H.O. mode/]

An FMIC is a dumb device, as you know a Scooby uses a MAF sensor and an inlet temp. sensor, what happens in the IC isn't relevant, as the metering is done before the turbo.

[imho mode/]

For a relatively standard car, not a forged re-build and turbo swap obviously, however.....

When I fitted my MD series turbo, and finally got the JGM to map it, Simon pointed out that the ecu had the fuelling and ignition sorted, but the boost control was all over the place ( 2 bar ! )

HTH

dunx

Boro

iTrader: (1)

This car was planned and booked in to have a simtek with anti-lag and launch control but the big ends went while on the rolling road!

I wondered whether running the car with the fmic for a couple of weeks before the remap might have been the cause\/

BlueBugEye

iTrader: (12)

Don't think the FMIC would have affected the big ends! Not really related, would only cause problems with the air fuel mix which should not have caused the bearings to go.

joz8968

iTrader: (13)

Boro, I think most of the specialists will tell you that if you drive off-boost i.e. don't go beyond 0psi/bar (atmos), then the car can be driven, no problem. Keep the revs to 3-4k too (70-80mph odd - so covers all UK driving requirements). If using no boost and at these sort of revs, then you'd be driving within the Lambda sensor's safe closed loop strategy anyway i.e. it's always trying to maintain the perfect 14.7:1 A/F ratio, so you KNOW you're not going lean.

I you wanted 'a bit of peace of mind' - and if you don't trust your right foot muscles lol - you can always temporarlily limit availble max boost too, to only the turbo's baseline 0.5bar or so, by bypassing the BCS and connecting the turbo compressor outlet nipple directly to the wastegate solenoid...