GT-R turbos on the VQ37

Jayhovah · 07-26-2017, 08:38 PM

Quote:

Originally Posted by husam2012

The thing is, that's the PSI including the oem boost solenoid which does adjust boost to a certain level.

Another interesting thing I found is this chart. Look at the standard actuator psi!

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Not sure about that chart... kind of suggests that the spring pressure is 4psi but the boost control will take it up to 18psi... That's kind of out of whack... At that kind of differential I would start worrying that the pressure of the exhaust itself would push the wastegate open.

That being said.. if the standard boost floor was around 12psi I would expect the wastegate pressure to be a little less than that... but I can also think of reasons why you would want to set it up right on the target.

Jayhovah · 07-26-2017, 08:50 PM

On way to test for sure is to pull your downpipes and run a regulated air pressure hose to your wastegates and slowly adjust until you see them start to open.... that would certainly take all the guessing out of it.

husam2012 · 07-26-2017, 08:53 PM

Quote:

Originally Posted by Jayhovah

On way to test for sure is to pull your downpipes and run a regulated air pressure hose to your wastegates and slowly adjust until you see them start to open.... that would certainly take all the guessing out of it.

That's true. I will be verifying that the map reading is accurate with a boost guage just incase.

One more thing for you! Where did you route your wastegate lines? Mine is just ugly looking right now but I was thinking of running Hardline across the engine similar to the GTR setup.

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Jayhovah · 07-26-2017, 08:57 PM

Quote:

Originally Posted by husam2012

That's true. I will be verifying that the map reading is accurate with a boost guage just incase.

One more thing for you! Where did you route your wastegate lines? Mine is just ugly looking right now but I was thinking of running Hardline across the engine similar to the GTR setup.

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I didn't do anything fancy... I put a barb in the passenger side charge pipe (as instructed by the Gamma manual) and ran that up to about the middle of the front of the intake manifold, then tee'd them from there back down to each wastegate. Just like the BOV, my goal here was just to have an equal length of line going to each...

sirnixalot · 07-26-2017, 08:56 PM

Last time I had to trouble shoot something like this on my old evo 3, I used one of those hand pressure/vacuum pumps and took note of when the actuator rod stared moving.

husam2012 · 07-28-2017, 07:57 PM

I did something similar. I guess I'll just keep it as is and see how it holds up.

Got my new 1000cc injectors installed today. Hoping this solves running out of fuel at the top end. I will be also getting a fuel pressure guage just to check on how safe it is.

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Jayhovah · 07-28-2017, 09:22 PM

Which injectors did you go with? and which pump are you running?

husam2012 · 07-30-2017, 09:27 PM

Quote:

Originally Posted by Jayhovah

Which injectors did you go with? and which pump are you running?

I'm running the aeromotive 340 with Nostrum Energy 1000cc injectors supplied by my tuner.

Currently it's running weird with these injectors after the retune but my duty cycle is just around 60 now so hopefully we can figure it out without a return system.

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husam2012 · 07-31-2017, 07:18 PM

Finally some free time today. I think I figured out why bank 1 was richer/maf voltage lower.

It looks like this clamp wasn't tight enough since I could pull move it with some force. Tightened it to as much as I could without breaking it

Also some more pictures since I don't think I've posted these before

Steering rack shims/ spacers

Steering shaft clearance is about a finger width now. Shouldn't be an issue at all

Passenger side. Excuse the messy downpipe haha

Tidying things up and looks like I have a small pinhole in the wastegate line! Maybe that's why it goes up to 12 psi. I hope so atleast

Also, thanks for the idea whoever posted it here. I tested the wastegates and they open at the same time but the guage isn't very accurate I think since it takes 20 psi to open it all the way. It starts opening around 4-5 psi but the guage is off since it's a cheap $10 pump

Edit: just did a pull after making sure there's no boost leaks and it's still at 12 psi and even 13 :/

Good news is my new injectors are working perfectly WOT (60% duty cycle now)but a little weird while idle which is understandable.

Notice the boost at 3000rpm

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natedog37 · 08-04-2017, 01:32 PM

Good news is my new injectors are working perfectly WOT (60% duty cycle now)but a little weird while idle which is understandable.

Great thread! I sub'd right away and am so glad to see your car up and running. I
ve been researching Fuel injectors a lot lately for my Powerstroke. One thing I came across was that rebuilt injectors were a having a tough time idling, whereas brand new ones never seems to have that problem. Are yours Rebuilt? I read multiple threads of guys having to switch out individual injectors until they were "balanced" to get their trucks to idle right. Just something to consider. Rock on!

Jayhovah · 08-04-2017, 01:36 PM

Quote:

Originally Posted by natedog37

Good news is my new injectors are working perfectly WOT (60% duty cycle now)but a little weird while idle which is understandable.

Great thread! I sub'd right away and am so glad to see your car up and running. I
ve been researching Fuel injectors a lot lately for my Powerstroke. One thing I came across was that rebuilt injectors were a having a tough time idling, whereas brand new ones never seems to have that problem. Are yours Rebuilt? I read multiple threads of guys having to switch out individual injectors until they were "balanced" to get their trucks to idle right. Just something to consider. Rock on!

Interesting... Never heard that myself. Generally when you send a whole set of injectors in for service they will balance the flow between them.

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husam2012 · 08-04-2017, 01:54 PM

The car actually didn't run right with these injectors as they were originally engineereed for the 350z. The replacements are coming in either Saturday or Monday (1050cc)!

I'm hoping I will be able to run e85 with them for safety. Car runs perfect otherwise

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Hotrodz · 08-04-2017, 02:00 PM

Quote:

Originally Posted by husam2012

The car actually didn't run right with these injectors as they were originally engineereed for the 350z. The replacements are coming in either Saturday or Monday (1050cc)!

I'm hoping I will be able to run e85 with them for safety. Car runs perfect otherwise

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You should not have any problem with those sized injectors. More importantly is what size your is your fuel pump and is e85 compatible?

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husam2012 · 08-04-2017, 02:33 PM

Yeah I have the aeromotive 340 which is e85 compatible.
Just hoping that running 10-12 psi of boost won't throw my fuel pressure too low.

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Hotrodz · 08-04-2017, 02:38 PM

Quote:

Originally Posted by husam2012

Yeah I have the aeromotive 340 which is e85 compatible.
Just hoping that running 10-12 psi of boost won't throw my fuel pressure too low.

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It will be close...

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07-26-2017, 08:56 PM	#5 (permalink)
sirnixalot Track Member Join Date: May 2017 Location: Cayman Islands Posts: 685 Drives: 2010 370Z Rep Power: 57455	Last time I had to trouble shoot something like this on my old evo 3, I used one of those hand pressure/vacuum pumps and took note of when the actuator rod stared moving. __________________ 2010 Sport - LS3 swap loading 2012 Frontier - BTWTuning VK56DE swap

07-28-2017, 07:57 PM	#6 (permalink)
husam2012 Track Member Join Date: Mar 2015 Location: Michigan Posts: 553 Drives: 370Z Nismo Rep Power: 9470	I did something similar. I guess I'll just keep it as is and see how it holds up. Got my new 1000cc injectors installed today. Hoping this solves running out of fuel at the top end. I will be also getting a fuel pressure guage just to check on how safe it is. Sent from my iPhone using Tapatalk __________________ Creator of the GTR TT Conversion Kit, NA Record Holder (401WHP) Ecutek Master Tuner (VQ37, VR30, VR38, B58, S55, S58) BTWTuning

07-31-2017, 07:18 PM	#9 (permalink)
husam2012 Track Member Join Date: Mar 2015 Location: Michigan Posts: 553 Drives: 370Z Nismo Rep Power: 9470	GT-R turbos on the VQ37 Finally some free time today. I think I figured out why bank 1 was richer/maf voltage lower. It looks like this clamp wasn't tight enough since I could pull move it with some force. Tightened it to as much as I could without breaking it Also some more pictures since I don't think I've posted these before Steering rack shims/ spacers Steering shaft clearance is about a finger width now. Shouldn't be an issue at all Passenger side. Excuse the messy downpipe haha Tidying things up and looks like I have a small pinhole in the wastegate line! Maybe that's why it goes up to 12 psi. I hope so atleast Also, thanks for the idea whoever posted it here. I tested the wastegates and they open at the same time but the guage isn't very accurate I think since it takes 20 psi to open it all the way. It starts opening around 4-5 psi but the guage is off since it's a cheap $10 pump Edit: just did a pull after making sure there's no boost leaks and it's still at 12 psi and even 13 :/ Good news is my new injectors are working perfectly WOT (60% duty cycle now)but a little weird while idle which is understandable. Notice the boost at 3000rpm Sent from my iPhone using Tapatalk __________________ Creator of the GTR TT Conversion Kit, NA Record Holder (401WHP) Ecutek Master Tuner (VQ37, VR30, VR38, B58, S55, S58) BTWTuning Last edited by husam2012; 07-31-2017 at 10:56 PM.

08-04-2017, 01:54 PM	#12 (permalink)
husam2012 Track Member Join Date: Mar 2015 Location: Michigan Posts: 553 Drives: 370Z Nismo Rep Power: 9470	The car actually didn't run right with these injectors as they were originally engineereed for the 350z. The replacements are coming in either Saturday or Monday (1050cc)! I'm hoping I will be able to run e85 with them for safety. Car runs perfect otherwise Sent from my iPhone using Tapatalk __________________ Creator of the GTR TT Conversion Kit, NA Record Holder (401WHP) Ecutek Master Tuner (VQ37, VR30, VR38, B58, S55, S58) BTWTuning

08-04-2017, 02:33 PM	#14 (permalink)
husam2012 Track Member Join Date: Mar 2015 Location: Michigan Posts: 553 Drives: 370Z Nismo Rep Power: 9470	Yeah I have the aeromotive 340 which is e85 compatible. Just hoping that running 10-12 psi of boost won't throw my fuel pressure too low. Sent from my iPhone using Tapatalk __________________ Creator of the GTR TT Conversion Kit, NA Record Holder (401WHP) Ecutek Master Tuner (VQ37, VR30, VR38, B58, S55, S58) BTWTuning

08-04-2017, 01:32 PM	#10 (permalink)
natedog37 Base Member Join Date: Apr 2012 Location: PacNW Posts: 12 Drives: Workin' on it. Rep Power: 14	Good news is my new injectors are working perfectly WOT (60% duty cycle now)but a little weird while idle which is understandable. Great thread! I sub'd right away and am so glad to see your car up and running. I ve been researching Fuel injectors a lot lately for my Powerstroke. One thing I came across was that rebuilt injectors were a having a tough time idling, whereas brand new ones never seems to have that problem. Are yours Rebuilt? I read multiple threads of guys having to switch out individual injectors until they were "balanced" to get their trucks to idle right. Just something to consider. Rock on!

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