Nissan 370Z Forum

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-   -   GT-R turbos on the VQ37 (http://www.the370z.com/engine-drivetrain/119302-gt-r-turbos-vq37.html)

Rusty 10-03-2017 09:55 AM

I would send the oil to Blackstone for oil analysis before doing anything else. How big was the flakes that you seen?

unijabnx 10-03-2017 06:11 PM

Did you plan to post the design or sell the adapters so people on the forum can put together their own gtr kit??

husam2012 10-03-2017 08:57 PM

Quote:

Originally Posted by Rusty (Post 3697572)
I would send the oil to Blackstone for oil analysis before doing anything else. How big was the flakes that you seen?

Unfortunately I had my boss who's been working on tuning performance cars (GTRs, Supras, etc) for a long time and he told me that it's just a matter of time before it spins a bearing considering what we saw in the oil filter.

Quote:

Originally Posted by unijabnx (Post 3697733)
Did you plan to post the design or sell the adapters so people on the forum can put together their own gtr kit??



Yes I will, I'm hoping to figure out the final piece tomorrow but I do have the website up if you want to pay to join the group buy!


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phunk 10-03-2017 09:47 PM

You can change the bearings without entirely rebuilding the engine or even removing the heads. That is, if you felt it was worth all the work. If you planned to build it in a year anyway, I wouldnt bother. But if you wanted to get several years from the stock engine it could be worth it.

Rusty 10-03-2017 09:52 PM

Quote:

Originally Posted by phunk (Post 3697799)
You can change the bearings without entirely rebuilding the engine or even removing the heads. That is, if you felt it was worth all the work. If you planned to build it in a year anyway, I wouldnt bother. But if you wanted to get several years from the stock engine it could be worth it.

I've changed bearings before without pulling the motor. You might be able to do the same thing. Depends on how willing you are.

phunk 10-03-2017 09:54 PM

Quote:

Originally Posted by Rusty (Post 3697801)
I've changed bearings before without pulling the motor. You might be able to do the same thing. Depends on how willing you are.

In the Z you need to remove the engine to remove the upper oil pan. This would get you access to the rod bearing. If you needed to do the main bearings too the bedplate will have to come off and thats essentially a full tear down except you can leave the heads on.

I suppose you could also drop the crossmember to get the upper pan off but that is a nightmare. I did that with my DE once to change the rear seal housing and it was torture being under there with the engine dripping oil on me the entire time.

Rusty 10-03-2017 10:04 PM

Quote:

Originally Posted by phunk (Post 3697803)
In the Z you need to remove the engine to remove the upper oil pan. This would get you access to the rod bearing. If you needed to do the main bearings too the bedplate will have to come off and thats essentially a full tear down except you can leave the heads on.

I suppose you could also drop the crossmember to get the upper pan off but that is a nightmare. I did that with my DE once to change the rear seal housing and it was torture being under there with the engine dripping oil on me the entire time.

I've lifted a couple of V8's up with hoist. Dropped the pan to change the bearings. Yeah, forgot how the bottom of the Z motor is. Not enough room, even with the motor lifted.

ihiryu 10-04-2017 02:18 PM

Hmm. I don't want to throw any shade around, but you had a coolant leak, and then spun a bearing. Any possibility the tune issue? Sounds like you pressurized the cooling system on the dyno ?

If you ran too much timing, or too lean, it's definitely going to pop the head gasket, pressurize the system, and leak externally. Now normally I've seen when this happens coolant comes spewing our the reservoir, but I guess it's possible to leak out of some other seal BEFORE the radiator.

And of course, you now have a spun bearing. I just find it hard to believe that a lot of other guys are boosted on stock internals, making a bit more power than you, and so far so good on their stock motors.

husam2012 10-04-2017 02:21 PM

Quote:

Originally Posted by ihiryu (Post 3697969)
Hmm. I don't want to throw any shade around, but you had a coolant leak, and then spun a bearing. Any possibility the tune issue? Sounds like you pressurized the cooling system on the dyno ?



If you ran too much timing, or too lean, it's definitely going to pop the head gasket, pressurize the system, and leak externally. Now normally I've seen when this happens coolant comes spewing our the reservoir, but I guess it's possible to leak out of some other seal BEFORE the radiator.



And of course, you now have a spun bearing. I just find it hard to believe that a lot of other guys are boosted on stock internals, making a bit more power than you, and so far so good on their stock motors.



You must of missed the post where I mentioned that the car was idled with no oil pressure up to operating temp while I checked for leaks. Totally my fault that I didn't see the low oil pressure symbol on the dash.

The tuner isn't the best either but I'm almost certain it's just the oil issue and nothing else.


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adam4g63 10-04-2017 02:22 PM

Wasn't the motor starved of oil, at one point?

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ihiryu 10-04-2017 02:42 PM

Gotcha, I did totally miss that. Like I said, I didn't want to say it to spread any type of animosity, but just another line of thinking on the possibility of what could have happen.

husam2012 10-04-2017 08:56 PM

Thanks phunk for the help, but i don't really wanna mess with trying to change bearings only for it to possibly fail on me again in the future. I do have access to a lift now thankfully (at my new job) and can probably swap a used engine in over a weekend.

Now the funny thing I just discovered as I was searching for a used engine on eBay...
All of them list compression as 280-290 on all cylinders.

I did a compression test on my engine while it was warm just before the dyno and got 170-180 consistently across all 6 cylinders which I thought was normal since it was consistent.

I guess that's why the car only made 460~ whp on 93 octane.

ihiryu 10-04-2017 09:06 PM

I have the spec sheet, the compression psi test varies a bit. I don't recall it, but is a huge variance

SG4247 10-04-2017 09:16 PM

175 psi is typical for many 11:1 engines I have tested, that are in good running order.

110-120 psi would be concerning.

rovert 10-04-2017 09:32 PM

From the FSM

https://i.imgur.com/SMqaCRk.jpg

husam2012 10-04-2017 09:39 PM

So yeah, it looks like my engine was way low on compress based on the FSM.


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Jayhovah 10-05-2017 12:33 PM

Quote:

Originally Posted by husam2012 (Post 3698078)
So yeah, it looks like my engine was way low on compress based on the FSM.


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Hope you are able to source a used motor. I've got my fingers crossed for you!

husam2012 10-05-2017 01:34 PM

Quote:

Originally Posted by Jayhovah (Post 3698209)
Hope you are able to source a used motor. I've got my fingers crossed for you!



Thank you i was just looking at options since my engine still runs perfectly fine.

I thought about trading it in (putting it back to stock first) and getting a '14 nismo but i'd be losing a lot more than i would by just fixing it. If my savings looks good by december then it's time for a used engine since they are under 2k for a very low mileage motor.


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Hotrodz 10-05-2017 02:46 PM

Quote:

Originally Posted by husam2012 (Post 3698219)
Thank you i was just looking at options since my engine still runs perfectly fine.

I thought about trading it in (putting it back to stock first) and getting a '14 nismo but i'd be losing a lot more than i would by just fixing it. If my savings looks good by december then it's time for a used engine since they are under 2k for a very low mileage motor.


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When you start looking for a motor search for a g37 motor as the price is much less than a 370z motor. I know it doesn't make since as they are the same engine however one it in a sportscar lol!

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jwick 10-05-2017 09:48 PM

Quote:

Originally Posted by Hotrodz (Post 3698238)
When you start looking for a motor search for a g37 motor as the price is much less than a 370z motor. I know it doesn't make since as they are the same engine however one it in a sportscar lol!

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More likely due to quantity. There are a ton more G’s out there.

natedog37 10-09-2017 01:01 PM

I'm just going to throw this out there, but you could start a go fund me page. I've got $5 buck for you, lol. Honestly, what you were able to do and write about on here has been fun to watch and if it costs me a cup of coffee then I'm in. I'd like to see how this turbo and motor combo develop. I know it's a hard sell to ask for money so you can hot rod your car around, but people on here would get it. Who knows you could literally raise dozens of dollars! :tup: Just saying'.

RadioFlyer 10-09-2017 01:23 PM

I think that's a great idea - and I'd go a step further and suggest that if you could put together a kit for sale that uses takeoff parts from GTRs, you could probably raise a good bit of money. You're knocking on the door of offering a mild turbo kit that uses stock GTR parts (reliability, QC), for way less than what's currently out there. You'd have to supply the manifold, downpipe, intercooler, and intake pipes. Customer sources the fuel and tuning. Just a thought...

husam2012 10-12-2017 09:20 AM

Quote:

Originally Posted by natedog37 (Post 3699001)
I'm just going to throw this out there, but you could start a go fund me page. I've got $5 buck for you, lol. Honestly, what you were able to do and write about on here has been fun to watch and if it costs me a cup of coffee then I'm in. I'd like to see how this turbo and motor combo develop. I know it's a hard sell to ask for money so you can hot rod your car around, but people on here would get it. Who knows you could literally raise dozens of dollars! :tup: Just saying'.

I really appreciate the thought! Anything could help and I might consider this if my funds don't allow me to fix this car by Feb/March.

Thank you!

Quote:

Originally Posted by RadioFlyer (Post 3699004)
I think that's a great idea - and I'd go a step further and suggest that if you could put together a kit for sale that uses takeoff parts from GTRs, you could probably raise a good bit of money. You're knocking on the door of offering a mild turbo kit that uses stock GTR parts (reliability, QC), for way less than what's currently out there. You'd have to supply the manifold, downpipe, intercooler, and intake pipes. Customer sources the fuel and tuning. Just a thought...

I would love to do this but the problem is the initial cost for a single kit like that. I like the idea though especially since my friends broken VQ laying around in my backyard (Fabricate piping on it)




Currently the car is still running fine, but i'm scared of driving it because of the eventual bearing spinning out. I do have all my gauges and flex fuel wired in.

I do have some good news for you guys though! I was reading through the Ecutek guide the other day only to discover that using the GT-R map sensor on a Z makes it read 0.23 bar too high when logging it.

I finally got a boost gauge and my car makes 8.5~ PSI at around 5500 then drops to less than 7 PSI near redline!

It finally makes sense why I made 460~ WHP 375 WTQ

Jayhovah 10-12-2017 09:24 AM

Quote:

Originally Posted by husam2012 (Post 3699713)
I really appreciate the thought! Anything could help and I might consider this if my funds don't allow me to fix this car by Feb/March.

Thank you!



I would love to do this but the problem is the initial cost for a single kit like that. I like the idea though especially since my friends broken VQ laying around in my backyard (Fabricate piping on it)




Currently the car is still running fine, but i'm scared of driving it because of the eventual bearing spinning out. I do have all my gauges and flex fuel wired in.

I do have some good news for you guys though! I was reading through the Ecutek guide the other day only to discover that using the GT-R map sensor on a Z makes it read 0.23 bar too high when logging it.

I finally got a boost gauge and my car makes 8.5~ PSI at around 5500 then drops to less than 7 PSI near redline!

It finally makes sense why I made 460~ WHP 375 WTQ

Mystery solved! I wonder why the MAP sensor reads inaccurately.

husam2012 10-12-2017 09:26 AM

1 Attachment(s)
Quote:

Originally Posted by Jayhovah (Post 3699716)
Mystery solved! I wonder why the MAP sensor reads inaccurately.

http://www.the370z.com/attachment.ph...1&d=1507818376

Jayhovah 10-12-2017 09:33 AM

Well there you have it. Looks like its just calibrated differently.

370Stealth 10-12-2017 10:02 AM

So I had the pleasure of meeting Husam in person since we live in the same state and couple minutes away and I just have to say, what he is doing with this car and the experiments, it's coming out really nice!

RadioFlyer 10-12-2017 04:49 PM

Quote:

Originally Posted by husam2012 (Post 3699713)
SNIP...
I would love to do this but the problem is the initial cost for a single kit like that. I like the idea though especially since my friends broken VQ laying around in my backyard (Fabricate piping on it) ...SNIP


^That's what you crowdfund for! You already have the kit, just make jigs for all the piping, and crowdfund the initial investment for the first run of parts. It could pretty much run like a presale/group buy. Once you have a couple sales under your belt, it can fund itself!

husam2012 10-21-2017 10:51 PM

Quote:

Originally Posted by RadioFlyer (Post 3699840)
^That's what you crowdfund for! You already have the kit, just make jigs for all the piping, and crowdfund the initial investment for the first run of parts. It could pretty much run like a presale/group buy. Once you have a couple sales under your belt, it can fund itself!

Thank you all for the suggestion. I have started a gofund me page just as suggested in hopes that it will help me start selling these kits for an affordable price.

https://www.gofundme.com/help-me-fin...gtr-conversion

Thank you everyone for everything along this great journey. I'm currently saving up for a used engine so I can drop my subframe and work on making a jig for inlets and downpipes to be sold with the adapter kits. I'm hoping to have enough saved up for a used engine by February so I can have the pieces ready to ship before summer.

RadioFlyer 10-22-2017 01:46 AM

Awesome... funded! Keep the updates coming! Good luck!

EliteXpress 10-22-2017 08:41 PM

Sent you a lil token of appreciation, hope you finalize this project and help put a lot more Boosted Z'$ on the streets!:tiphat:

husam2012 10-23-2017 11:46 AM

Thank you everyone for your help! It's really appreciated and shows how good this community is.


I will be updating everyone as soon as I get any news :)

Thanks again!

natedog37 10-23-2017 04:01 PM

Boom! $5 bucks as promised. Come on everyone, it's quick and easy to donate. Seriously, I hope you've enjoyed reading along as much as I have, if you have, donate so we can see it get completed and tested (flogged) properly.

husam2012 10-26-2017 07:08 PM

Thank you! I really appreciate the help from you guys :)

Here’s a small update. Finally got a revised steering rack shim/spacer to make the oem braces fit without modification!

https://uploads.tapatalk-cdn.com/201...f73b0166f1.jpg


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husam2012 10-27-2017 06:59 PM

GT-R turbos on the VQ37
 
Mounted it on the car. The steering shaft clears perfectly while only spacing the rack down 1/2 an inch! GTM's earlier kits spaced it out by a whole inch. https://uploads.tapatalk-cdn.com/201...e67eee7815.jpg



Also, here's some pictures of how the turbos look from the underside with the downpipes.

https://uploads.tapatalk-cdn.com/201...123c06b677.jpghttps://uploads.tapatalk-cdn.com/201...ffab250932.jpg
Don't mind the steering shaft scratches. That was before I added any spacers at all.

https://uploads.tapatalk-cdn.com/201...36b200e944.jpg
https://uploads.tapatalk-cdn.com/201...f2a11d68bd.jpghttps://uploads.tapatalk-cdn.com/201...116c0a9d5b.jpg
https://uploads.tapatalk-cdn.com/201...2057d88757.jpghttps://uploads.tapatalk-cdn.com/201...af5e10a055.jpg

Budget doesn't afford me anything more than the Megan Y pipe and a open dump past the diff but it sounds perfect!


My nismo exhaust is for sale if anyone wants it!!

https://uploads.tapatalk-cdn.com/201...27206e97da.jpg

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sirnixalot 10-30-2017 08:20 AM

I've been back and forth in my head trying to choose a route to boost. Gotta say I love the OEM look and feel of this, along with the fact that the air filters end up above the water line.

Any chance you could do a recap of what the end goal is for what the kits would come with?

Exhaust flange adapters
Steering rack spacers
Downpipes?

sirnixalot 11-06-2017 08:38 AM

Just donated :)

husam2012 11-06-2017 12:09 PM

Thank you! My goal is to have both downpipes and inlets along with the oil/coolant lines and everything needed to bolt on the turbos.
If things don’t go as good as im hoping, then its just the adapter kit.


Sad news but i’m not really upset. Im just content that i got to achieve this but destroyed this engine in the process by overlooking the oil filter stud.

My father took it to work today as he wanted to try it out, and a piston decided to leave it’s home. Just as I predicted but he told me he was accelerating in 6th which probably helped a little in destroying it this fast



https://uploads.tapatalk-cdn.com/201...7a4c3c7c90.jpg


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Jayhovah 11-06-2017 12:33 PM

Quote:

Originally Posted by husam2012 (Post 3705201)
Thank you! My goal is to have both downpipes and inlets along with the oil/coolant lines and everything needed to bolt on the turbos.
If things don’t go as good as im hoping, then its just the adapter kit.


Sad news but i’m not really upset. Im just content that i got to achieve this but destroyed this engine in the process by overlooking the oil filter stud.

My father took it to work today as he wanted to try it out, and a piston decided to leave it’s home. Just as I predicted but he told me he was accelerating in 6th which probably helped a little in destroying it this fast
( Click to show/hide )




https://uploads.tapatalk-cdn.com/201...7a4c3c7c90.jpg


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RIP Original motor. We are pulling for you man!!!

Rusty 11-06-2017 06:07 PM

Boy......................this sucks! :(


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