GT-R R35 Plenum Test Fitment on my VQ37HR

ChrisUR

My car is currently not ECU-tuned - it has been dynoed with the stock manifold and my other mods (exhaust, CAI, NST Pulleys) then will be dynoed with the GTR plenum conversion.

I think for most people its interesting how mods can perform just with the OEM Nissan tune, so you can have real bolt-on performance.

Of course I have read the articles in DSPORT where they tested the M370 manifold and found out that a ECU tune is vital to at least restore stock peak performance and have gains in the RPM band.

Depending on how the conversion performs with the stock tune I will then maybe do a custom tune for the manifold to see whats really possible on a NA car if you max out possibilities.

I will report about every step and result in detail when we start testing.

Chris

__________________
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

wstar

That's not really what I mean, exactly. I guess what I'm saying is, the situation some have observed with the M370 is this: Stock tune before, bolt on the M370, stock tune after, got gains. Dyno-tuned before, bolt on the M370, re-Dyno-tune after, no gains. In other words, the M370's gains were entirely overlapped with effective dyno-tuning, making the mod pointless, especially considering a dyno-tune can be had for far less than the cost of a GT-R manifold and custom extra hardware.

If the GT-R manifold conversion makes true flow gains (as opposed to just tricking the stock ECU into leaner conditions at various points in the rev range), you should be able to dyno-tune a stock car w/ UpRev, install the GT-R manifold, and then re-dyno-tune again and still see gains from the new part.

Sorry for seeming negative, I'm really not . I love the idea of this, and I suspect it's capable of real gains. Just want you to know ahead of time, that's what it's going to take to prove it: either you, or a customer, will have to do that dyno_tune->dyno_test->install_it->dyno_tune->dyno_test process.

__________________
7AT Track Car!
Journal thread / Car setup details

ChrisUR

no problem, I see your point !

what I will do is test the GTR manifold on my car first for fitment, etc. Then I will dyno my car which has the stock tune on it but already other mods like CAI, catback, NST pulleys and compare before and after installation.

If everything fits and the car runs perfectly with the new manifold I will ask one of my friends who will dyno-tune his car with catback and sport cats next week to stop by and have the GTR manifold installed.

He will then go to the dyno again and measure before re-tune, then re-dyno-tune with the manifold and have another dyno pass.

I hope that is what you are looking for !

Chris

@Chrisw
I apologize for not having at least a ball park figure for you currently but today I don't even have a clue how much the fabrication of the flanges plus welding will cost me, so whatever number I give you now I might regret later.

Plus we have never installed at least the (not build yet) prototype so it is possible that during the installation and testing we discover that additional small parts are needed which I will put in the package to give you a real complete bolt-on solution as good as it can get.

Please bear with me for another couple of days - we are almost there and my plan is that before end of January the final product and installation package is ready to be build with prices and dyno results.

__________________
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

XwChriswX

No worries bud! Just wanted to see if anything had been tossed around yet.

Nice to see that someone who is undertaking this project actually showing Progress. Can't wait to see the final product.

__________________

Bonnie - Stage 2, Audio build coming this fall!
R.I.P. Abby 3/29/10 - 3/30/14

ChrisUR

only a quick update - I have currently about 25 cnc companies I wait for a price quote for machining the flanges, etc. - hope to start production by end of the week.

meanwhile the fuel rails have arrived - we will start to modify them for the 370Z tomorrow !



Chris

__________________
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