TT Question

[Cloud]

Have a sliight prob with how my 99 rsk boosts sometimes, 90% of the time it works normal boosting 10ish on primary and 14-15ish on secondary, But every now and then the primary wont boost ,car just lags untill 4500rpms when it will go straight ta 14psi. It has a zerosport sc installed and the wiring looks fine on it, I have heared theres a flap that might need adjustment? ? Is that correct... Its like its trying to run both turbos instead of just primary sometimes when its below the 4500rpm changeove, make sence? . I can live with it but it makes it feels hella slow when it happens haha, Cheers

[telemekas]

Appears maybe that your ECV (exhaust control valve) is staying open and you are in parallel mode at low RPM.

What have you set crossover rpm (valve open etc) and return rpm (valve close etc) points on the Seq Controller.

[Cloud]

That is what I think its doing, Controller set to 4500 open and 3300 to close it off, Is the ECV adjustable or ever need servicing? Im not sure where it is

[telemekas]

The return rpm 3300 may need to be increased. Trying to go on boost again (ie 3400rpm) before it has dropped back to 3300 rpm from 4500+ rpm you will be in parallel mode.

The ECV (large cannister/actuator)is located on the drivers side of the engine.There is an actuator rod connecting it to the ECV .

ECV can be fine tuned.

"You can adjust the actuator rod on the ECV to optimise the changeover.

Start the car cold (unless you have heatproof fingers) and undo the locknuts on the ECV adjustment rod and wind it out until you hear it rattle, then wind it in till the rattle stops and then another complete turn then redo the locknuts.

This allows it to leak a bit of boost on the primary before the changeover actually starts so it reduces it a bit.

You have to play with it a little to get the right amount of leakage or it makes less of a difference or you cant reach full boost on the primary and get poor primary response"

quote billsy

[Garryg]

 telemekas said:

The return rpm 3300 may need to be increased. Trying to go on boost again (ie 3400rpm) before it has dropped back to 3300 rpm from 4500+ rpm you will be in parallel mode.

The ECV (large cannister/actuator)is located on the drivers side of the engine.There is an actuator rod connecting it to the ECV .

ECV can be fine tuned.

"You can adjust the actuator rod on the ECV to optimise the changeover.

Start the car cold (unless you have heatproof fingers) and undo the locknuts on the ECV adjustment rod and wind it out until you hear it rattle, then wind it in till the rattle stops and then another complete turn then redo the locknuts.

This allows it to leak a bit of boost on the primary before the changeover actually starts so it reduces it a bit.

You have to play with it a little to get the right amount of leakage or it makes less of a difference or you cant reach full boost on the primary and get poor primary response"

quote billsy

Any pics of this avtator rod??

[telemekas]

Their is a nice pic of a VF32 with the large actuator cannister here. You can see the rod with long central adjustment connector and lock nuts at each end plus the ECV.

http://cgi.ebay.com.au/Turbocharger-SUBARU-LEGACY-RHF4-Twin-Turbo-VF25-VF32-/280566977606?pt=AU_Car_Parts_Accessories&hash=item4153185446

[Cloud]

Ok, Moved the the SC shut off point to 4000rpm and had a play with the evc canister adjustment rod ,Adjusted it till it started rattling then turned it back the other way till it stoped then +1 more turn, did up locknuts and took it around the block, primary turbo response felt alot better and noticed more of a kick when 2nd turbo came in, Was boostin 10psi and 14-15psi without fail on the quick ten min drive and didnt do the random shit it was doing. Will take it over to Palmy tomorow and give it a real test. Cheers telemekas, You know your stuff aye