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Discussion Starter · #1 ·
Hello there,

Thank you for providing such a wealth of I formation on the qr25de engine on this very well sorted forum.

I apologise I haven't a sentra however our engines are almost identical so at heart we are foolish together.

I guess we cannot believe as most will tell us that the best thing to do with a at engine is to get a different car. Nissan has far too great a pedigree to provide a piece of garbage.

So far I have seen that with the X trail t30 (first gen qr25de) if they didn't die early from butterfly screw ingestion or cat converter exgestion then they go forever. Just make sure you don't forget to put oil in.

Mine now often runs below the low mark on dipstick (290k km) and performs no different.

Alas it is time for a rebuild and I acquired a whole donor car which is a 2007. Thus 2 lambda sensors and slightly defined computer.

This will be my rebuild for I hear it has a full crank and it is more efficient for me.

If anyone gets back to my post, the computer and further tuning is th hardest info for me to find. Any tips from anyone would greatly help.

In the future I would like to supercharge. It is my work car and pulls a trailer sometimes and it usually carrying 400 plus kg of tools and equipment.

Used car prices are ridiculous in Australia at the moment. It will be better value for me to pursue this method and have another 10 years of fun then to get something else and have to rebuild or replace shortly down the track.

Thanks again for the forum.

Tradie X trail G
 

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I believe T30 has the black plug ECM and if so you should be able to install www.uprev.com and tune the engine.

Uprev can provide more information about the specific ROM file found in your ECU and if they support it. They may not have a copy of your specific ROM file because it was never available in the states. They can help you with exporting the file and sending it via email.

Sent from my SM-G986U using Tapatalk
 

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Discussion Starter · #3 ·
Hi Jeremy.

Thanks a bunch. This information is so hard to find.

My hope is that ECU retune is not required but if I go with HHO (browns gas supplementation) Ill have to fiddle with the O2 sensor readings anyway.

My engine rebuilder racing guy says anything will require retune and dyno.

Thanks for being so fast and in tune with the forum.

Guy
 

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Hi Tradie, welcome to the place of all knowledge QR25DE ;)

I also have a T30, Series 1, and recently had my engine rebuilt due to being down on power and using more fuel. Mainly wanted to replace the aging timing chain and cam phaser, but while it was apart found it to have a bent #1 cylinder rod which was probably from when it got hydrolocked after a deep creek crossing.

The best way I have found over here in AUS for tuning is to get a piggy-back of which I have a Haltech Miniceptor. I did this after adding a CAI and full high-flow stainless exhaust to improve power and fuel economy. Obviously got it tuned on a dyno once fitted.

I'm also planning on adding an Eaton M90 supercharger to the QR but it's proving a challenge with the position of our brake fluid reservoir.
 

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Discussion Starter · #5 ·
Hi Kev

Thanks for the update. Your build was why I joined the forum initially. So far, the response is great. Within hours. Thanks.

I have seen pictures of the elusive QR25DER which has been put into the R52 Hybrid Pathfinders however that is all I can find. They have a m90 / 62 lookalike type blower mounted in your same proposed location on top of a tall, upright 4 runner manifold. Said SC is driven from the same proposed location as yours. Perhaps you were ahead of their engineers.

My engine builder tells me that the engine series numbers are the same but in his secret circles the engines are almost non interchangeable. I guess they took all the lessons from guys tuning the QR and made stronger components, even though it is only rated at 250hp, which may or may not include the input from the electric motor.

There seems to be no available literature on them though. I can see why, what fuel sniffing, ear bleeding kind of guy would hot up his hybrid.



Thanks for your input.

Guy
 

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Hi Tradie,

I have had mostly Nissans myself and currently have a Canada market t30 Xtrail that is consuming oil. I'm in the midst of trying to see if it is possible to retrofit a 2nd gen from a Rogue (S35) North American market as they did not burn oil like he 1st gen QRs. Even if it's just the bottom end I can use. Wrecking yards here are quite plentiful of these vehicles. The only thing I noticed with early 2nd gen QR25 is that they seem louder like piston slap; I know a technician at a dealership that replaced a few blocks for that.
 

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The main thing you need to look out for will be engine mounting.
Here in AUS the second gen T31 had an extra engine mount ontop which the 1st gen T30 did not. Not sure if all the bottom mounts are in the same position though.

Oil consumption could be from a CAT falling apart and the engine sucking ceramic particles into the cylinders. This would need a re-bore and oversized pistons+rings. It might also just be normal high mileage wear which can usually be halted with a slightly thicker grade of oil. Here in AUS the 5W30 was too thin and changing to 10W40 solved the problem after the engine reached over 120,000kms.
 

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The main thing you need to look out for will be engine mounting.
Here in AUS the second gen T31 had an extra engine mount ontop which the 1st gen T30 did not. Not sure if all the bottom mounts are in the same position though.

Oil consumption could be from a CAT falling apart and the engine sucking ceramic particles into the cylinders. This would need a re-bore and oversized pistons+rings. It might also just be normal high mileage wear which can usually be halted with a slightly thicker grade of oil. Here in AUS the 5W30 was too thin and changing to 10W40 solved the problem after the engine reached over 120,000kms.
Hi Kev,

Yes, we had very similar issues in Canada with first generation QR25s, the same as what they had in the States as well as the X-trail; it was not sold in the USA for some reason, we sold a lot of them too. I just removed an s35 motor for comparison today
 
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