And finally here is our unit replacing a stock unit! You will notice some slight differences in gear to gear design. These differences improve durability, performance and reliability in the gears themselves.

If the gears were such an issue why isn't there any kind of tsb's from Nissan?

Probably for the same reason there has never been one for the fuel pump, CSC, or engine temperature. This is a one of the car's glass jaws that becomes apparent when the car is driven to the limit. If you stay under the stock redline, there should be no issues.

One way to see where the reliability issues are in the VQ37 is to compare it with the VR38. As I understand it, the crankshaft can deflect at high RPMs and the crank-driven pump is vulnerable to the harmonics generated at those RPMs. The VR38 uses a chain-driven pump to prevent this issue.

NISMO makes an uprated pump, but it doesn't solve the root problem, and is only reliable for a few runs past 7800 RPM. During the Z33 era, the Z was Nissan's flagship racing platform and NISMO developed lots of race-hardened parts not just for their own efforts, but for customers as well. These days, the R35 is the motorsports platform and it's up to the aftermarket to support the Z34.

I'm going back and fourth between this and the nismo pump. I can't afford dailys dry sump just yet. I can't wait for someone to test these gears out in real world conditions

Cosmo as with any car manufacturer tsb are not always put out with every defect... To make the statement that because there is no tsb then there is not a problem is short sighted and lacks the understanding of what is really going on in the oil pump housing...

What causes these to break are micro welds developed between the oil pump gears and the crank shaft. This becomes apparent more and more over time and is not caused by over revving the motor. We have several customers who have shattered their oil pump gears with factory rev limits. With that said the above failure was within factory specs. Also with corresponding mods the motor does not run out of steam over 7500rpms this is very evident in builds such as 1slow370 where he revs to 8300rpm on the daily.

So please unless you have factual information to add to the conversation or are willing to be constructive to the conversation I would ask you respect our moderators wishes and our threads. We do not want the unfounded negativity you have brought us and others in the past in our threads.

Thank you

Elmo,

You won't have to wait long we have a customer car which just had this installed last week. And we are waiting on a new main harness before we put it on the dyno.

Good news! We will have 20 units certified and in stock come Monday morning. All orders placed so far will be fulfilled and shipped.

[QUOTE=RJ MFG;3512754]Good news! We will have 20 units certified and in stock come Monday morning. All orders placed so far will be fulfilled and shipped.[/QUOTE

I don't go past redline so hopefully never an issue for me but I am curious what are these engines balanced up to? Seems may be fixing one issue just to have another? Regardless of what they "can" make power up to I wonder what they safely make power up to.

And I goofed and quoted the wrong post.

[QUOTE=Jhill;3513853]We have seen the issue on stock cars. As stated before the issue is related to the material and design of the factory units. We just pulled a motor with 6k miles and already had significant wear and signs of micro-welding. You don't have to raise the RPM limit to experience a failure. we have redesigned the gear tooth to increase performance and strength as well as changed the contact points with the crank to prevent microwelding. This will give you a bulletproof product under stock conditions and is rated up to 10k rpms. All gears are certified and come with their own blueprint documentation.

[QUOTE=RJ MFG;3514806]Surprising that there have been so many failing pumps at stock revs and so few miles, but no one seems to be posting about them. I know not everyone who owns a Z is on here but you'd think the people that autocross regularly or track would have posted issues with the stock limiter. The only posts on here with failures have been those with up'd rev limiters.

[QUOTE=2011 Nismo#91;3514893]As you stated not everyone posts about their failures. the unit we posted with a broken pump is a forum member here, but chose not to post for whatever reason. In respect to his privacy we will not disclose his username unless he feels comfortable chiming in. A lot of people dont see it as a problem until the gears break on them and then its like how the hell did this happen? not all the posts here of broken gears are of raised RPM limits...

Again micro-welding can and has happened under stock normal loads, this is a fact.

We have seen it first hand and so have several other shops. Several shops have seen it as a great product and will be carrying these items here in the next few weeks for their customers.

[QUOTE=RJ MFG;3515021]Hmm, somebody is up to something...LOL

These have arrived! Thanks, RJM!

http://i.imgur.com/GtRyB.jpg

:worthless: