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After a number of Accusump failures due to high oil pressure in the Porsche 986 Spec Boxster, Canton Racing Products has developed an electric valve upgrade kit.
The rubber membrane in the older valve units would rupture under pressure, allowing oil to slowly leak through the membrane. This resulted in the unit failing to hold adequate pressure. When you shut the engine down, the pressure in the accumulator would slowly drop.
The unit was designed for 35-40 pounds of oil pressure, and the Boxster usually pushes around 95 pounds.
Anyway, they've done away with the fragile membrane and developed a much sturdier valve unit. This is the older unit. The membrane could be accessed (and replaced) by removing the four large Phillips screws. The new unit is being sold through Summit Racing (free shipping) $227.
I've had continuing problems with my Accusump for the past year and installed this upgrade yesterday. The install was easy peasy. We'll see how it works at Sebring. I'm not affiliated with these guys, but they were soooo helpful on the phone, getting this sorted out.
The best upgrade I've done to my accusump is taking it out.
I've been debating on whether or not to install in my build. I have one from my 944LS3 car that I parted out. Never had the problem stated above even though I was 95psi under power.
You can afford to. You've got a spare crate motor sitting in your garage.
Not anymore - put that into another car already. Now I just have a 20,000 mile engine sitting in the garage. However, I've seen engines pop because an accusump was involved. I've not seen one fail because an accusump was not involved. Just my experience. Gladwill took his out for the same reason.
Not anymore - put that into another car already. Now I just have a 20,000 mile engine sitting in the garage. However, I've seen engines pop because an accusump was involved. I've not seen one fail because an accusump was not involved. Just my experience. Gladwill took his out for the same reason.
I hear of this more and more. Anyone weigh one when they took it out? Maybe if I took mine out I could get the car to a reasonable weight
Not anymore - put that into another car already. Now I just have a 20,000 mile engine sitting in the garage. However, I've seen engines pop because an accusump was involved. I've not seen one fail because an accusump was not involved. Just my experience. Gladwill took his out for the same reason.
Data shows it is "reactive". The issue is loss of oil pressure on some tracks, on some turns. At our local track there are two higher G right handers that are when oil pressure drops. Very momentary. By the time the accusump reacts and dumps in its oil, the drop is gone and no longer needed. So it never actually helps with the initial pressure drop, so any damage done is done. it is similar to a lot of the tranny cooler setup being used.....guys use no data to show the actual effect of the system. No Data, never happened......
Data shows it is "reactive". The issue is loss of oil pressure on some tracks, on some turns. At our local track there are two higher G right handers that are when oil pressure drops. Very momentary. By the time the accusump reacts and dumps in its oil, the drop is gone and no longer needed. So it never actually helps with the initial pressure drop, so any damage done is done. it is similar to a lot of the tranny cooler setup being used.....guys use no data to show the actual effect of the system. No Data, never happened......
HPR 4 & 7? Saw a SPB smoking pretty regularly and heavily coming out of 11 at a race last year, but think that was an AOS issue...
01-31-2017, 05:48 PM
Accusump Upgrade
