Good morning everyone,

I have a 2009 Infiniti G37 Sport Coupe/6MT car that I've slowly been modifying over the past year. Currently I am finishing Phase I (Suspension). Phase II is the transmission which should be done within a month. And then I'll be moving on to the engine..

Car is stock except for intake and full exhaust. Its got 189k and as far as myself and most others can tell, its the original engine (I bought it in 2020 with 142k on it). Eventually my plan is to go FI/Turbo, but for now I've been thinking, and really curious to figure out how much power I could make if I went full FBO (and when I say full FBO I mean, every bolt-on imagineable, underrive pulleys included, the works). The only thing I wouldn't do is go Long Tube Headers, because The Turbo Kit I want wil bolt up to shorties and I've decided to go with a set of ISR Shorties rather than longtubes.

I'm going to do a compression check on the engine, and my first order of business is to do fresh chains/tensioners and Galley gaskets. As far as I know, the car is on original galley gaskets!!

Also, I am going to over build the car in my quest for NA power, as when its time for Turbo Power, I don't want to buy things twice.

I'm thinking Stock longblock VQ37VHR, Ported Upper/Lower Manifold, 3" Cold Air Intakes, Underdrive Pulleys, ID 1000cc injectors. 340LPH Fuel Pump, ISR Shortie Headers, im sure there are a couple of things I'm forgetting on E85...

This will be thru a 6MT - I'm looking for some opinions on what it could make for power? I'd love to make 340-360HP but not sure if thats out of my realm.

Thanks for any input you may have.

 

Hey Toni, sadly you'll be closer to 330 at most 340whp. This includes age of the engine and year of VHR. A newer 2015 + VHR would yield a few more but it would stay under single digit improvements.

350 seems to be more of a cammed number realistically

One huge aspect that many folks go through a lot with VQs is being able to run them both in NA and FI without much sacrifice however once you start to burn E85, the ethanol will over time wear out the cylinders which will deteriorate the engine a bit more which will lower the amount of fun and abuse you'll be able to give it once you go turbo.

They Hybrid modding only the things I can maintain in both NA/FI mode is smart but only to a certain specific. I would still throw these parts on but stay away from ethanol until you go FI. I would focus on a more conservative and fuel efficient tune. One that will keep the airfuels lean when not needed to be richer will decrease chances at carbon build up. Focus on going over the engine to make sure it will accept boost without hiccups.

 

If I ever get my car finished, I'll let you know!

I have a 2012 6MT sedan that is mostly FBO but not done yet.

2.75" intakes with velocity stacks (I feel 3" is unnecessary if 2.5" stillen gen3's have been seen to make 330whp already)
Ported TBs, upper, and lower manifold
Stock exhaust manifold but I plan to get z1 shorty header eventually
Resonated HFC (could pick up a few ponies by going with test pipes)
2.5" Fast Intentions CBE with 18" resonators
GTR 550cc injectors
Tuned by Eugene using Ecutek

Now the reason I'm posting this is because I'm also removing excess weight that could be reflected on a dyno, and I'm very curious to actually get a dyno after I get my build done.

I currently have 18lb wheels, z1's two piece front and rear rotors, and I plan to get a lightened flywheel and new clutch setup, but I'm not sure if that will be reflected on a dyno or not. Possibly even a CF driveshaft to top it all off.

So after all of those things, my hopes are that I'll see 340-350whp as a final result. This will be on 93 pump gas and not E85.

I also plan to get z1's 4.09 final drive which may skew results as well. All in good time though.... the economy has sucked recently so I haven't been able to do hardly any modding for a quite a while.