Blown Motor, Engine Rebuild/Replacement.

Boosted Performance

Since you will have a built engine, let me know if you decide to switch kits. I would love to see a twin scroll kit on a customer’s built VQ37VHR.

I think I have seen many manufacturer’s (JWT, APS, Garrett..ect) cast manifolds crack on the VQ35de, so this won't be any different despite the manufacturers stating that they never crack, and that these cast manifolds are superior to those that are welded...go figure. The T25 turbos are light, so this does not happen due to weight, it happens because of poor casting. Welding a support bracket will make things worse, because now you are making things rigid. Rigid and thermal dynamics don’t work well at all, and more cracking will occur. This is why I use so many flex couplers on the twin scroll kit. Everything must be able to move independently.

EDIT: Of course, and I forgot to mention, there would be some good incentives.

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COSMO

Your absolutely right I did use your pics to state my concerns and I do apologize for not asking first. Please forgive...

COSMO

Had a long day so no work done today and no pics but tomorrow I have time before my afternoon appointments...

COSMO

Does anyone know what kind of power I will get out of the gtm stage II turbo's maxed out? I am guessing 600whp -ish?

theDreamer

Nizzing with a stage 2 GTM kit hit just over 600whp at 13PSI.
Highest build I have recorded is below, with a built block:
Mr. Squeeze:
2010 370z 6MT GTM Stage 3 TT at 19PSI 647HP & 613TQ

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esfourteen

gt28rs with .86 AR (stage 2) on 93 is good for around 600whp. On e85 or with meth you could certainly push them higher, but at 7500rpm at 18psi you are at the very edge of the turbos efficiency. Running more than that on our engine you would start to overspin the turbos up top, which would shorten their life and blow warmer air, so e85/meth would be a must to compensate. This is assuming around 10:1 CR

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Build Thread | GTM TT Install Thread | Engine Build Thread

Boosted Performance

If you are considering switching to a single turbo (any kit on the market, or custom) just make sure you go with a large T4 turbine housing on the built motor. I would suggest the Precision 67mm billet turbo with a T4 1.32 a/r twin scroll (largest available for that urbo), or if you are going with a tangential housing, you can go to a .96 a/r turbine housing. Anything smaller and you will lose out on a lot of power.

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COSMO

Here are some pics I took from working about 4 hours this morning getting ready to pull the blown motor. Sasha can you tell me what kinda of difference the spool would be coming from a TT setup to a single? I may be interested only if I can sell my gtm TT kit for a decent price.

Attached Images

	P1000273.jpg (318.8 KB, 90 views)
	P1000272.jpg (288.1 KB, 76 views)

BlkNismo

Since your building the block and already have the gtm kit, have you thought about just upgading the turbos to a stage 3 or 4? As well as bigger injectors and pump? Prob a fuel return kit also at this new power level.

COSMO

Actually I have but I think with just over 600whp I would be more than happy... Plus I do not care to deal with gtm and their customer service issues...

phunk

With those turbos on a 350z with E85 we were maxed out at about 630rwhp. The car was pretty strong, but he sold the kit a few months ago to go bigger.

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Boosted Performance

If your goal is 600whp, the 62mm turbo will do it effortlessly on pump gas. At the same time it will still leave room for some more if you decide to kick it up a notch.

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COSMO

Hey phunk I just wanted to say thanks for the help today with the fuel pump. Please keep me up to date when your return fuel system s finished. I checked out the link you sent me and the new intake and it looks Great!!!

Boosted Performance

Sorry, I missed this one. The spool will be as good as with your current TT setup (and I would get you the BB option at no extra charge), but a lot more efficient up top. The turbos I use are equivalent to the Garret GTX line of turbos since they have the lighter billet wheel, and can work at a higher pressure ratio. These turbos don't even start to shine until you get to 20+psi of boost.

Here is a pull on the heart breaker dyno on a built VQ35DE with a 8.5:1 compression ratio. This was done with the largest turbo/turbine I offer with this kit, the 6766 with a 1.32 a/r turbine housing. This was also a JB turbo, and the same twin scroll kit I build for the VQ37VHR. The higher CR of your build, more displacement and BB option will all help in spooling it up even better. I would guess that you would see 15psi by about 3700rpm. That will be plenty to get 500ft/tq out of a built engine at about 4000rpm.




Here is another dyno, also a VQ35DE, with a twin scroll, JB 6766 T4 1.15 a/r kit. This is a completely stock block, that is why the torque was kept at about 400ft.:



As you can see, these spool up great, and the power keeps climing all the way to redline due to the large turbine housing which allows the system to flow efficiently.

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wstar

Man those graphs look really smooth and easy to drive, especially the stock-block one. It's tempting

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