e-Boost2 FAQ


Can I fit and set up the e-Boost2 or e-Boost STREET myself?
e-Boost2 is a fully featured programmable electronic device. Turbosmart recommends that you use a reputable, qualified technician to install and tune it for you. If you are a competent, technically-savvy DIY installer, we suggest you carefully read and follow the instructions included with the unit.

What is a good basic set of settings that could be used as a starting point?
The first thing to be done is to adjust the Overboost setting up to the amount of boost that you do not want the vehicle to run at. If your goal is a maximum of 20 psi and you consider 25psi to be a “danger zone”, set the OBS to 23 for example. Secondly, the Gate Pressure setting should be adjusted down to zero.

Now lets start tuning. Focus on getting your SP value set properly to achieve your desired boost level. Once this has been accomplished, you can then start adjusting the Gate Pressure to get the turbo response you are after. If you are seeing an undesirable spike in initial boost, turn down the GP setting until you are happy.

Remember higher GP setting equals a more aggressive boost ramp and lower GP will slow down the turbo response. A Gate Pressure setting of 3 to 5 psi less than your actual boost target usually results in the most aggressive boost curve (turbo response) while not over-shooting and spiking the initial target.

Example: SP value is set at 40 and the boost is running at 15 psi. A GP (Gate Pressure) setting of 10 – 12 psi would be pretty close to getting the best turbo response without boost spiking.

Finally, you can adjust the SN (Sensitivity) level if you are seeing significant boost drop off and higher RPM and/or the turbo response is still too slow after GP adjustments. Too high of a SN value can result in a wavy boost curve so adjust carefully. The default setting of 20 is generally just fine.

If I’m not using external switching or aux output do I just leave those wires disconnected?
Yes, you only need to connect the wires that you’re actually using. If external switching and aux output is not being used leave the green, orange and white wires disconnected.

What is the proper connection method for the e-Boost2 solenoid into an external wastegate?
Port 3 goes to pressure, Port 2 goes to the bottom port and Port 1 vents to atmosphere.
This is a basic setup and is the recommended starting point for boost control. The other hook up methods are designed to combat issues like high exhaust back pressure.

How much current you can safely pull through the green switching wire? For example if I want to run a switch that has a bulb to indicate the switch is on?
Don’t do it! The switching wires are only to see ground. You will cook your e-Boost quicker than you can say “oops” using your approach. If you want to run an indicator light, you must use an isolation relay for the bulbs circuit.

I have a turbocharged motorcycle with a Turbosmart wastegate and want to install an e-Boost2 but I’m worried that it’s not waterproof.
e-Boost 2 is very popular on turbocharged motorcycles, mainly for its ability to provide 6 stages of sequential boost control. Most users mount them up on the triple trees. e-Boost2 is NOT water proof but with careful installation and a little silicone they are quite water resistant – something our customers using them on their Jet Skis can attest to.

I understand the Sequential Switching Function B for the gear-based boost, but how can I be sure that the boost set points are correct when I power off and on? With the power shut off, I could change gears and then turn the power back on. How would the controller know what gear it is in? Is there a “reset” or sync feature or when you power the unit up, does it default to a certain set point?
e-Boost is always looking for a ground signal to shift. So if you turned the bike on in 3rd gear, it’ll only be at setpoint one since it has not seen a rising edge ground signal. It will always start from SP1 when starting up. If the bike will always be started in neutral, then it should perform flawlessly. Another option would be ESP, as it is looking for a continuous ground signal from each wire rather than a momentary ground but this will limit the amount of boost settings to 4.

I’m re-mounting my eBoost 2 and I don’t want to lose the current setup. Will the settings be retained with the unit unplugged?
No, you won’t lose anything if you unplug your eBoost2. But if you are worried, take 5-10 minutes and note down all your settings. it’ll be helpful if you do accidentally change something.

After installing the e-Boost2 or e-Boost STREET my engine is over-boosting/underboosting.
• Check that the e-Boost solenoid is installed correctly.
• Ensure the factory boost control solenoid is not connected in the hose between the pressure source and the wastegate actuator
• Ensure the length of the wastegate actuator rod has not been modified, refer to the manufacturer’s specifications.
If the over/under/irregular boost is still occurring…
• Check to see if the e-Boost solenoid is not blocked or contaminated with dirt, oil build up or debris
• Check the joining hoses for splits, cracks or loose connections and ensure they are not blocked, kinked or restricted, particularly if the
existing hose was reused
• Pressure test the wastegate actuator for leakage, the diaphragm or housing may be cracked or split

If the over/under/ irregular boost is still occurring…
• Ensure the smooth and free operation of the wastegate arm in the turbo exhaust housing.
• Check that the hose between the e-Boost and the inlet manifold is not obstructed, broken or kinked.
• Check that the OBS is set higher than the boost pressure you are aiming for.
• Check the Blow-off Valve for leakage, some are used as over-boost valves

If the over/under/ irregular boost is still occurring…
• Gate pressure maybe set too close to your actual boost pressure – ensure correct sensitivity setting.

I’ve lost my instructions disc, where can I get the latest instructions?
All the lastest Fitting Instructions and Technical Updates are available for downloading from the INSTRUCTIONS section of our website. Also checkout our library of DIY and instructional videos.


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