M35 Issues And Rectification A You Have Heard Of

[tony200]

I found this article on M35 issues and fix regarding the turbo.

Is this something people know of, have done or do as recommended?

"For Nissan M35 Stagea vehicles with the VQ25DET engine, the Garrett M24N turbocharger is susceptible to failure due to a blockage of the 1 mm oil feed if the car is not serviced regularly. To overcome this, a common modification is to bore out the banjo bolt on the oil feed from 1 mm to 3 mm."

[datmoo]

"if the car is not serviced regularly" is the important part. Stock turbos can last 200,000+ km (185,000 on mine), only need to drill out when you go high flow.

[valf]

How often is regularly though ? 5000km between oil changes seems to come up fairly often on the forum, it seems a little excessive but I'm no mechanic so I'll trust what's on here

[stripey]

Most vehicles have 10,000km service intervals but most vehicles owned by enthusiasts or the like change oil at 5000km intervals i think it is something about oil being at or close to the end of its usability at 10,000km and start cloging up parts in your engine

[valf]

Anything not to blow my turbo

Apparently, a good mod is to also change the dump pipe on the M35 (Scotty's one looks pretty popuular).

What's the overall cost of this (part and labor)? Proven benefit on the turbo?

[joshm35]

Boost to 30psi. Fixes turbo issues

[admS15]

30's not enough. 40 psi generally clears blocked oil lines nicely

[tony200]

I would also like to know the costs and benefits (power/ecconomy) over stock of the dump and front pipe.
I currently have the Nismo cat back system so would be good to know when combined with this.

Anything not to blow my turbo

Apparently, a good mod is to also change the dump pipe on the M35 (Scotty's one looks pretty popuular).

What's the overall cost of this (part and labor)? Proven benefit on the turbo?

[BIGZED]

The stock dump has a nice big cat like item about 20mm from the end of the turbo, scottys doesnt.


I'm sure the lack of restriction would change a lot, though I'm yet to drive an M35 without one of his dumps.

[DrLui]

The stock dump has a nice big cat like item about 20mm from the end of the turbo, scottys doesnt.

I'm sure the lack of restriction would change a lot, though I'm yet to drive an M35 without one of his dumps.

If we catch up before i change my dump pipe you can drive mine to notice the difference

[Reaperblitz]

Anyone tried coring the cats.... out of curiosity?

[scotty nm35]

The issue with the dump isn't just the cat, it's the 50c piece sized hole the exhaust needs to squeeze through before it.

I wouldn't go talking about punching out cats online personally, it's a big fine.

[Leroy Peterson]

does stagea dump look similar to VQ30DET dump?

[scotty nm35]

No Leroy, it's even worse.

[BoostdR]

There are 3 oil restrictors which is why they are more susceptible to oil contamination, turbo failure is more common from over speed. Turbine wheels doesn't fall off due to oil starvation, it is due to turbine over speed. A boost leak, larger exhaust, bleed valve and time all contribute. The only reason people stress so much is the turbo is a much bigger pain to change than the previous ceramic turbo wheel'd nissans. Max wheel speed is surpassed not much over 15psi, hitting the rev limiter and a subsequent backfire can tip it over the edge.

Pls be aware changing to a bigger dump or exhaust will reduce your OEM turbo life *unless you can reduce the boost back to std levels. Anything on the intake side can increase turbine speed if it reduces restriction, even without a rise in boost.

Having said that I lowered the motor and trans down(don't forget to undo the steering shaft like I did) with the help of some info from the guys here and was able to change the turbo out without too much hassle. First time can be very daunting. certainly a job I would leave to someone who has done it a few times.

Matt

[scotty nm35]

Actually, these aren't 34 gtt turbo's, I have recently diagnosed a customers car that was running 22psi for the last few years on a stock turbo, the turbo is still working fine. Don't get these ceramic turbo's mixed up with older RB ones, they are much more hardy.

The reduction in exhaust temps with an unrestricted dump is much more important than keeping the shaft speed lower. It's the rear bearing that fails on these mainly, which takes all the turbine blades off the hub.

[zoomzoom]

does stagea dump look similar to VQ30DET dump?

Is that small hole at the back really the exhaust outlet?? It looks like an o2 bung opening!

[BoostdR]

lets agree to disagree on this one scotty ;-) on all points

[Leroy Peterson]

Is that small hole at the back really the exhaust outlet?? It looks like an o2 bung opening!

The small hole at the end is for o2. It's just a pic of the bottleneck in the top section of the dump. It's. 90 degree piece

[joshm35]

Butn the car and get the insurance. .... end of issues