Is my oil cooler overkill for the street?

1slow370 · 09-01-2013, 05:50 AM

Quote:

Originally Posted by phunk

There is a regulator in the oil pump that will prevent oil pressure from getting to high

there is a tiny regulator in the pump that attempts to keep the oil pressure from getting to high, can't remember which team it was but one of the HR race cars was noting over 110psi at 8000rpm.it's to bad the pump is located on the crank snout or it would be a great pump for a wet sump system, unfortunately high rpm's still effect it similar to the issues the old rb26's had when the crank nose vibrates it puts a huge strain on the tight clearances in the pump, imo this is what most likely killed megan370's motor not the vvel. the pickup has a screen in it so it is unlikely that a pin from the vvel got sucked into the pump and more likely that the pump blew cuz his rev limiter was raised, which lead to his vvel roasting and blowing.

phunk · 09-02-2013, 11:41 PM

Quote:

Originally Posted by 1slow370

there is a tiny regulator in the pump that attempts to keep the oil pressure from getting to high, can't remember which team it was but one of the HR race cars was noting over 110psi at 8000rpm.it's to bad the pump is located on the crank snout or it would be a great pump for a wet sump system, unfortunately high rpm's still effect it similar to the issues the old rb26's had when the crank nose vibrates it puts a huge strain on the tight clearances in the pump, imo this is what most likely killed megan370's motor not the vvel. the pickup has a screen in it so it is unlikely that a pin from the vvel got sucked into the pump and more likely that the pump blew cuz his rev limiter was raised, which lead to his vvel roasting and blowing.

I agree. VQ pumps have been notorious for failure. But our VHR's 7500rpm redline was enough to grenade the classic DE pump. So we are better off than the VQ was around 2003. I believe that the VR38 took the pump off the crank and put it down on a chain. But, the Toyota 2JZ seemed to have no problems with the oil pump drive gear interfacing directly on the crankshaft... so there is hope in working with it.

Rusty · 09-03-2013, 01:52 AM

Quote:

Originally Posted by 1slow370

there is a tiny regulator in the pump that attempts to keep the oil pressure from getting to high, can't remember which team it was but one of the HR race cars was noting over 110psi at 8000rpm.it's to bad the pump is located on the crank snout or it would be a great pump for a wet sump system, unfortunately high rpm's still effect it similar to the issues the old rb26's had when the crank nose vibrates it puts a huge strain on the tight clearances in the pump, imo this is what most likely killed megan370's motor not the vvel. the pickup has a screen in it so it is unlikely that a pin from the vvel got sucked into the pump and more likely that the pump blew cuz his rev limiter was raised, which lead to his vvel roasting and blowing.

Quote:

Originally Posted by phunk

I agree. VQ pumps have been notorious for failure. But our VHR's 7500rpm redline was enough to grenade the classic DE pump. So we are better off than the VQ was around 2003. I believe that the VR38 took the pump off the crank and put it down on a chain. But, the Toyota 2JZ seemed to have no problems with the oil pump drive gear interfacing directly on the crankshaft... so there is hope in working with it.

This is why I won't put a lightweight dampener on my Z. The change in vibration pitch on the end of the crankshaft.

1slow370 · 09-11-2013, 02:49 AM

Quote:

Originally Posted by phunk

I agree. VQ pumps have been notorious for failure. But our VHR's 7500rpm redline was enough to grenade the classic DE pump. So we are better off than the VQ was around 2003. I believe that the VR38 took the pump off the crank and put it down on a chain. But, the Toyota 2JZ seemed to have no problems with the oil pump drive gear interfacing directly on the crankshaft... so there is hope in working with it.

Yes the 2JZ pump has a much better reputation but the design on it is clearly more durable. It uses a spline to drive the center gear meaning the center gear has a more uniform thickness instead of the 2 large flats that leave thin spots in the gears in the corners, the spline is also going to absorb the crank vibrations smoother than the Flats which tend to knock around more violently at high speed. The gear set also uses the older tooth style for pump itself which moves less oil, but does give you a more durable outer gear that is more resistant to minor vibration. the vq pump does flow more oil, and probably draws less power but is not as stable at high rpms, if you look toyota uses a vq style gearset and flat drive on the slower v6 and v8 engines.

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