DIY on throttle surge control
Thread Starter
Newbie
Joined: Apr 2010
Posts: 66
Likes: 0
From: Caribbean
DIY on throttle surge control
While developing a standalone multigauge controller with economical parameter based (boost,rpm,tps,etc) aux. drivers with a DC% when triggered to handle on throttle surge I decided to share a possible DIY option with the forum.
If you are experiencing on throttle surge, which is caused by the Turbo VE (vol. eff.) exceeding the Motor VE in terms of boost CFM produced > CFM consumed , turbo surge results. This phenomenon can be induced by a Turbo upgrade, a restriction in the vehicle intake post turbo (eg. intercooler) or by securing possible boost leaks. The latter can include upgrading from a leaking BOV/BPV to a 'better' aftermarket version. Even cam alteration can induce it.
Usually this surge is for a lower RPM surge, WOT Hi RPM surge is best handled by the boost controller. If the crack pressure 'floor' of your wastegate exceeds the surge boost zone your mbc/ebc is helpless.
Here's the DIY fix.
You must have a decent ECU which allows config. of it's aux drives, eg Autronic. Also, you need a 3 port Solenoid valve similar to one running a EBC wastegate.
here's the procedure:
1) Establish the RPM/Boost range of the "surge" that you need eliminated.
2) For the parameter range in step 1), programme an aux. drive of your ECU to drive the 3 way solenoid to vent the manifold to BOV line to recirculate post MAF, pre turbo.
This has the effect of eliminating the compensatory pressure from the manifold to support BOV/CBV closure, thus the boost will cause the unassisted BOV spring to compress and create a desired 'leak' of excess CFM.
Now, the softer the spring (rate) the more CFM will leak for a given boost. You can control the amount of leak in 2 ways.
1) Adjust the BOV/CBV spring preload , less => bigger leak.
2) Define a duty cycle % from the ECU drive to the 3-way solenoid to control the % of manifold pressure reaching the BOV/CBV thereby controlling the CFM leak.
Now for my itty bitty plug.
If you don't have a custom ECU capable of meeting the requirements....well , pm me and we can chat about the capabilites of the standalone I am testing.
If you are experiencing on throttle surge, which is caused by the Turbo VE (vol. eff.) exceeding the Motor VE in terms of boost CFM produced > CFM consumed , turbo surge results. This phenomenon can be induced by a Turbo upgrade, a restriction in the vehicle intake post turbo (eg. intercooler) or by securing possible boost leaks. The latter can include upgrading from a leaking BOV/BPV to a 'better' aftermarket version. Even cam alteration can induce it.
Usually this surge is for a lower RPM surge, WOT Hi RPM surge is best handled by the boost controller. If the crack pressure 'floor' of your wastegate exceeds the surge boost zone your mbc/ebc is helpless.
Here's the DIY fix.
You must have a decent ECU which allows config. of it's aux drives, eg Autronic. Also, you need a 3 port Solenoid valve similar to one running a EBC wastegate.
here's the procedure:
1) Establish the RPM/Boost range of the "surge" that you need eliminated.
2) For the parameter range in step 1), programme an aux. drive of your ECU to drive the 3 way solenoid to vent the manifold to BOV line to recirculate post MAF, pre turbo.
This has the effect of eliminating the compensatory pressure from the manifold to support BOV/CBV closure, thus the boost will cause the unassisted BOV spring to compress and create a desired 'leak' of excess CFM.
Now, the softer the spring (rate) the more CFM will leak for a given boost. You can control the amount of leak in 2 ways.
1) Adjust the BOV/CBV spring preload , less => bigger leak.
2) Define a duty cycle % from the ECU drive to the 3-way solenoid to control the % of manifold pressure reaching the BOV/CBV thereby controlling the CFM leak.
Now for my itty bitty plug.
If you don't have a custom ECU capable of meeting the requirements....well , pm me and we can chat about the capabilites of the standalone I am testing.
