Originally Posted by cosmogirl Well it has come to my attention that this may happen in time with my exhaust manifold on my gtm TT kit so I am seriously
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12-10-2013, 11:36 AM | #91 (permalink) | |
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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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12-10-2013, 02:26 PM | #92 (permalink) | |
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Your absolutely right I did use your pics to state my concerns and I do apologize for not asking first. Please forgive...
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Last edited by COSMO; 12-10-2013 at 04:15 PM. |
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12-11-2013, 08:44 AM | #95 (permalink) |
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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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12-11-2013, 10:39 AM | #96 (permalink) |
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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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12-11-2013, 11:29 AM | #97 (permalink) |
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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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12-11-2013, 01:46 PM | #98 (permalink) |
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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.
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12-11-2013, 02:16 PM | #99 (permalink) |
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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.
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12-11-2013, 03:01 PM | #102 (permalink) |
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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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12-11-2013, 08:03 PM | #103 (permalink) |
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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!!!
Last edited by COSMO; 12-11-2013 at 08:29 PM. |
12-12-2013, 01:27 PM | #104 (permalink) | |
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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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