Jellybean Posted April 12, 2016 Share Posted April 12, 2016 Hi I looked at Ians thread and MkIV article , is there a more technical article with reference to voltage Actuators and VSVs: There are four VSV/actuator assemblies that control the sequential turbo operation: Intake Air Control Valve (IACV) Exhaust Gas Control Valve (EGCV) Exhaust Gas Bypass Valve (EGBV) Wastegate VSVs switch manifold pressure (boost) to and away from actuators. The actuators open/shut valve butterfly flaps. IACV When this switches, boost generated by #2 turbo is allowed to join the intake stream When it isn't switched, there is a small flap in the IACV assembly that allows any boost generated by #2 turbo as it prespools to join the intake stream, preventing turbo stall. EGCV This allows exhaust gas to flow through #2 turbo, causing it to spin up. When it's shut, there is no gas flow through the impeller of #2 turbo and therefore it doesn't spin. EGBV This allows some exhaust gas to bypass the EGCV and join the output of the first turbo. It serves two purposes - one, it prespools the second turbo by allowing some exhaust gas flow through it. Two, it controls the amount of exhaust gas going through the first turbo in much the same way as a wastegate - therefore controlling the maximum boost pressure generated by #1 turbo. Wastegate This bypasses exhaust gas from the first turbo, lowering the overall amount of exhaust gas going through *both* turbos and controlling the maximum boost pressure generated by both turbos in parallel. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 12, 2016 Share Posted April 12, 2016 They are not pulse width modulated save for the wastegate one. So the other 3 are either open or closed. The wastegate one is PWM controlled. Motec have an excellent series of webinars on PWM control of wastegates. Quote Link to comment Share on other sites More sharing options...
Jellybean Posted April 12, 2016 Author Share Posted April 12, 2016 Thanks Chris! Just giving the mapper a refresher on VSV's , we are going to run her in sequential , he said he had a M800 doing it before Pricing for the M130 looks good , might be able to get the GPR package at 60-70% reduced cost if under private license (we have the package only associated with the 2JZ crank trigger pattern) need Motec to get back, this is what John Reed is doing with his Supra firmware Quote Link to comment Share on other sites More sharing options...
Wez Posted April 12, 2016 Share Posted April 12, 2016 Indeed, three on/off VSV for sequential operation and the last VSV is essentially a PWM controlled boost solenoid. Quote Link to comment Share on other sites More sharing options...
Jellybean Posted April 12, 2016 Author Share Posted April 12, 2016 thanks Wez! Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 12, 2016 Share Posted April 12, 2016 Thanks Chris! Just giving the mapper a refresher on VSV's As you do..... Quote Link to comment Share on other sites More sharing options...
Jellybean Posted April 12, 2016 Author Share Posted April 12, 2016 As you do..... Lol he asked Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.