Changing Supercharger Oil

Just ordered the oil to change my supercharger oil. Anyone got any recommendations or are we just draining the reservoir and refilling with new oil?

Simply drain and refill. When you first start it up after refilling make sure you have oil coming back into the tank.

a7m266d -- You can pressure drain it using the same method you would use to prime it but I would just drain and refill the reservoir if you feel the need (Pages-7,8)... The recommended is 2-years/50,000miles (Page-3).

http://www.rotrex.com/pdfs/Rotrex_C-type_supercharger_installation_instructions-V1.4.pdf

Allen -- Note page 9... WOW they recommend a BOV now...who-da-thought... The next thing ya know they'll be recommending that you locate the intake where it can draw 100+ degree colder air into the compressor........lol

Typical Automotive = MAF mass airflow sensor (closed loop)

CBV (compressor bypass valve vented back into the intake track after MAF sensor) Being a closed loop system, any loss of air (venting to atmosphere) for which fuel has already been metered by the movement of the airflow sensor plate, will result in an over-rich condition.

Yamaha Apex = MAP manifold absolute pressure sensor (open Loop)

BOV (blow off valve vented to atmosphere) This is most common in an open loop EFI system that uses a MAP sensor. As the MAP sensors source is inside the inlet manifold's plenum chamber, relieving air to atmosphere will not affect fuel metering or engine operation.

HAMMER said:

Allen -- Note page 9... WOW they recommend a BOV now...who-da-thought... The next thing ya know they'll be recommending that you locate the intake where it can draw 100+ degree colder air into the compressor........lol

Typical Automotive = MAF mass airflow sensor (closed loop)

CBV (compressor bypass valve vented back into the intake track after MAF sensor) Being a closed loop system, any loss of air (venting to atmosphere) for which fuel has already been metered by the movement of the airflow sensor plate, will result in an over-rich condition.

Yamaha Apex = MAP manifold absolute pressure sensor (open Loop)

BOV (blow off valve vented to atmosphere) This is most common in an open loop EFI system that uses a MAP sensor. As the MAP sensors source is inside the inlet manifold's plenum chamber, relieving air to atmosphere will not affect fuel metering or engine operation.

Click to expand...

That is very well explained!

We installed a supercharger on a LS1 this summer and tuned it to run MAFLESS so we modded the BOV that came with the kit to vent to atmosphere

Thanks guys for the info. I ordered a new filter and SC oil yesterday from Mac. Should be good to go soon enough. Now I have to throw a track in it antirachet drivers and restud it and Im good to go! That and an Oil change!

I was thinking of a BOV now that you guys mention it, are either of you running one? How well does it work and is it really a requirement for me at 10 psi?

If the Flutter/Surge/Boost Spikes don't bother you....you don't need one.

In my case I had a real issue with my SCApex at 1/8-1/4 throttle... It surged/fluttered like crazy because it was building 4-12lbs boost (measured at intercooler) in those partial throttle, slow speed, high-rpm positions... The engine was not using all the boost created so it was forcing it's way back out the compressor wheel... Very annoying !!! and very hard on equipment I imagine... I'm running it at 10lbs boost and it would spike to 15lbs every time I let off the throttle... In this situation the pressure spike is trying to force it's way from the intercooler/intake tract back out the superchargers compressor wheel, since it is a direct drive system it's like applying a "brake" to the end of the crankshaft, which would explain why the deceleration side of my supercharger belt cogs showed wear and acceleration side of the supercharger belt cogs look new still...(and I'll bet that's why the Stage-IIs are having belt issues)

I bought a TurboXS Type S BOV to resolve this issue... Plumbed it in as purchased... Problem was it would only release excess pressure after a hard WFO run and letting the throttle plates slam closed (all the way off throttle)... It did nothing at the part throttle positions (stayed closed)... After reading woodsriders post where he had cut the stock BOV spring down I went out and cut 5-coils off mine (thanks by the way woodsrider)... Further in-the-field-testing will be required with the cut down spring... Running it in the garage, it starts to release pressure at part throttle, steady state, around 3000rpm showing 1.5lbs boost on the gauge (measured at intercooler)... Flutter/Surge/Boost Spikes are going to be his-to-ry this season.

Theory of operation goes something like this:

Vacuum on one side & Pressure on the other = Valve Open
Pressure on both sides + spring pressure = Valve Closed

See my posts in this thread for setup and pictures: http://www.ty4stroke.com/viewtopic.php?t=29659