GT-R R35 Plenum Test Fitment on my VQ37HR

Jordo! · 05-16-2013, 07:33 AM

interested - awaiting details following tune

6MT-Z34 · 05-16-2013, 08:29 AM

Quote:

Originally Posted by AlexRaymond19

****, if you lend me one, or give me a good discount I have the M370 and the stock manifold. Could do a three way tune and comparison for you. Totally unbiased, and I have really some of the best power making support mods for a NA 370.

I would like to see the results compared to a M370!!!

wstar · 05-16-2013, 09:46 AM

Given we have pretty good data now on M370-vs-Stock, it won't be all that hard to compare the new data to the M370 even if the mfg doesn't have an M370 to play with. Based on his preliminary results, I suspect this is going to be a pretty decent intake setup. My main concern at this point is the strut bar stuff. I don't see how you fit a strut bar over that thing, and I'd rather give up these intake gains that give up that strut bar's stiffness (I'm sure most others would make the opposite tradeoff, though, so I'm sure the product will sell).

Chuck33079 · 05-16-2013, 09:52 AM

Quote:

Originally Posted by wstar

My main concern at this point is the strut bar stuff. I don't see how you fit a strut bar over that thing, and I'd rather give up these intake gains that give up that strut bar's stiffness

This is where I stand too. The car comes with a nice triangulated bar from the factory. I don't want to lose that. I'm sure he'll address this issue. It can't be harder than the work he's done so far.

DIGItonium · 05-16-2013, 10:38 AM

Quote:

Originally Posted by Chuck33079

Put it on. Tune it. Show us what it will do with boost. I'd imagine it would really shine. I want this, but I'm not going to be the guinea pig.

I'd love to, but various priorities is keeping me from doing much with my car for the next 1-2 years. Double income would be nice by now lol. The next major phase short of building the motor is 3' exhaust, new fuel upgrades, and possibly change out the intake manifold.

Spikuh · 05-16-2013, 10:45 AM

For the strut bar issue, I am curious if something like this can work well.

Was thinking keep the rear part of the triangular bar, cut off the center piece and use a bar like this to wrap around the front. Don't see why there wouldn't be room in front of the manifold for something like this.

As for strength compared to what we currently have, I won't even begin to guess. Most engineering I have ever done is on a phone app.

Rusty · 05-16-2013, 07:39 PM

Quote:

Originally Posted by wstar

Given we have pretty good data now on M370-vs-Stock, it won't be all that hard to compare the new data to the M370 even if the mfg doesn't have an M370 to play with. Based on his preliminary results, I suspect this is going to be a pretty decent intake setup. My main concern at this point is the strut bar stuff. I don't see how you fit a strut bar over that thing, and I'd rather give up these intake gains that give up that strut bar's stiffness (I'm sure most others would make the opposite tradeoff, though, so I'm sure the product will sell).

Quote:

Originally Posted by Chuck33079

This is where I stand too. The car comes with a nice triangulated bar from the factory. I don't want to lose that. I'm sure he'll address this issue. It can't be harder than the work he's done so far.

Yeah, the strut bar is my concren too.

JC671 · 05-17-2013, 03:02 AM

I'm in FTW

Keep us posted when this starts going to production and if you can do a complete write up for install and post it in DIY section.

I'll definately be getting this.

Jordo! · 05-18-2013, 12:12 AM

Nuttin new to report as yet?

N8GTOL · 05-18-2013, 04:03 PM

Quote:

Originally Posted by Spikuh

For the strut bar issue, I am curious if something like this can work well.

Was thinking keep the rear part of the triangular bar, cut off the center piece and use a bar like this to wrap around the front. Don't see why there wouldn't be room in front of the manifold for something like this.

As for strength compared to what we currently have, I won't even begin to guess. Most engineering I have ever done is on a phone app.

Room to do it this way would not be my concern. A U-shaped bar like that would not be as stiff as the stock 370z brace which runs straight across. That big U is much more flexible out of plane than a straight across brace. You give up more mechanical advantage by not going straight across and would signifficantly reduce the out of plane stiffness unless you increased the thickness of the new brace enough to add back enough flexural and torsional rigidity which is just more weight and less efficient.

ChrisUR · 05-22-2013, 06:14 AM

yesterday I started the work on the strut bar issue. First of all we cut the horizontal connection as this will definitely never fit due to height.

The connection between strut tower and firewall is a no brainer - nothing changed there. Now we have to weld something strong enough to compensate for the missing direct link which runs in front of the plenum.

here is the link how it looks currently:
http://fbcdn-sphotos-g-a.akamaihd.ne...32432380_o.jpg

apart from that I have now driven about 2,000 miles with the new setup without any issues - no CEL, no bad behaviour, no idling issues, no nothing. From the current point of view you can simply change your stock plastic intake manifold to the GTR manifold and will have no issues, worries or need for ECU tuning.

Of course, ECU tuning is highly recommended to take full advantage of the new setup but I think its good news you can install it in your garage, drive the car when you need it daily and do the math whenever you have time to and drive the car to your tuner without worries.

AlexRaymond19 · 05-22-2013, 06:48 AM

Does the bar have to be on top of the engine bay? Why not under the car?

Chuck33079 · 05-22-2013, 07:31 AM

Quote:

Originally Posted by AlexRaymond19

Does the bar have to be on top of the engine bay? Why not under the car?

You want to tie the strut tops together. There's more flex at the top than the bottom since there's a lot more stuff on the underside of the car.

wstar · 05-22-2013, 08:16 AM

Right, it's a matter of geometry. In many ways the bottom corners are already connected (through the suspension, subframes, crash bar, etc) to each other. The tops, however, can flex around bit as the body twists and rolls. The point of the strut bar is to stiffen the front of the car against that flex/twist.

All things considered though, I don't see how he's going to maintain exactly the stock rigidity with this taller plenum. If it were me, I'd probably go for a compromise between the current hack (remove horizontal bar) and the photo above with the bar angling out to the front. Do a single wide bar like the one in the photo, but angle it around the back tying to the base of the windshield like the small bars do on the stock system. At least then the center of that angled flat bar will be fixated at the center.

AlexRaymond19 · 05-22-2013, 08:34 AM

Quote:

Originally Posted by Chuck33079

You want to tie the strut tops together. There's more flex at the top than the bottom since there's a lot more stuff on the underside of the car.

Gotcha

05-16-2013, 07:33 AM	#376 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 418	interested - awaiting details following tune __________________ Enjoy it. Destroy it.

05-16-2013, 09:46 AM	#378 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	Given we have pretty good data now on M370-vs-Stock, it won't be all that hard to compare the new data to the M370 even if the mfg doesn't have an M370 to play with. Based on his preliminary results, I suspect this is going to be a pretty decent intake setup. My main concern at this point is the strut bar stuff. I don't see how you fit a strut bar over that thing, and I'd rather give up these intake gains that give up that strut bar's stiffness (I'm sure most others would make the opposite tradeoff, though, so I'm sure the product will sell). __________________ 7AT Track Car! Journal thread / Car setup details

05-17-2013, 03:02 AM	#383 (permalink)
JC671 Enthusiast Member Join Date: Feb 2011 Location: Guam Posts: 451 Drives: Toretto around Rep Power: 14	I'm in FTW Keep us posted when this starts going to production and if you can do a complete write up for install and post it in DIY section. I'll definately be getting this. __________________ A special "Thank You" to the Fast Intentions Crew! "Fueled By Passion"

05-18-2013, 12:12 AM	#384 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 418	Nuttin new to report as yet? __________________ Enjoy it. Destroy it.

05-22-2013, 06:14 AM	#386 (permalink)
ChrisUR Base Member Join Date: Jun 2010 Location: Germany Posts: 116 Drives: 370Z Black Edition Rep Power: 15	yesterday I started the work on the strut bar issue. First of all we cut the horizontal connection as this will definitely never fit due to height. The connection between strut tower and firewall is a no brainer - nothing changed there. Now we have to weld something strong enough to compensate for the missing direct link which runs in front of the plenum. here is the link how it looks currently: http://fbcdn-sphotos-g-a.akamaihd.ne...32432380_o.jpg apart from that I have now driven about 2,000 miles with the new setup without any issues - no CEL, no bad behaviour, no idling issues, no nothing. From the current point of view you can simply change your stock plastic intake manifold to the GTR manifold and will have no issues, worries or need for ECU tuning. Of course, ECU tuning is highly recommended to take full advantage of the new setup but I think its good news you can install it in your garage, drive the car when you need it daily and do the math whenever you have time to and drive the car to your tuner without worries. __________________ ProStreet N1 exhaust \| ProStreet N1 Y-Pipe \| STILLEN G3 Intake \| NST Pulley Kit EIBACH Pro-Springs \| EIBACH Pro-Spacers \| EIBACH Sway Bars \| SEIBON GT2 Rear Wing MOCAL Oil Cooler 25row\| STILLEN TransCooler \| STILLEN PS Cooler \| STILLEN Front Fascia

05-22-2013, 06:48 AM	#387 (permalink)
AlexRaymond19 Track Member Join Date: Jun 2011 Location: Maine Posts: 771 Drives: 2010 Nissan 370z Rep Power: 15	Does the bar have to be on top of the engine bay? Why not under the car? __________________ 2010 370Z Touring MT \| Stillen \| Motordyne \| Momentum\| Z1 \| Fast Intentions \| Advant Garde \| RE11 \| Swift \| SPC \| Quaife \| Whiteline \| Evo R \| 322RWHP 259ft-lb Mustang

05-22-2013, 08:16 AM	#389 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	Right, it's a matter of geometry. In many ways the bottom corners are already connected (through the suspension, subframes, crash bar, etc) to each other. The tops, however, can flex around bit as the body twists and rolls. The point of the strut bar is to stiffen the front of the car against that flex/twist. All things considered though, I don't see how he's going to maintain exactly the stock rigidity with this taller plenum. If it were me, I'd probably go for a compromise between the current hack (remove horizontal bar) and the photo above with the bar angling out to the front. Do a single wide bar like the one in the photo, but angle it around the back tying to the base of the windshield like the small bars do on the stock system. At least then the center of that angled flat bar will be fixated at the center. __________________ 7AT Track Car! Journal thread / Car setup details

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