VQ37VHR Build Potential

[hazesleepgod]

I've been doing some research on the VQ37VHR, and my main goal is to make at least 425whp on natural aspiration. Meaning, about 450-475 to the crank given some mental estimates. In my case, the wheelbase is going to be shortened around 9.1in (100.4in --> 91.3in) to an exact. Added, a lighter flywheel, lighter driveshaft, etc. With all of this unadded load-travel, for a lack of better words, put me a little closer to that number? If needed more info on what exactly I'm adding to the drivetrain to achieve this, let me know and ill update with a more thorough list.

 

((edit; Z31-t chassis already has a curb weight is about 3,285lbs. My main goal with the chassis as well is to shed just shy of a grand in weight. This will be achieved with the full fiberglass (carbon fiber if time and money are right) silhouette with a full roll cage going through the cab. Firewall forward, and rear struts back minus the hatch will all be chopped off and replaced by rollbars and gussets. The attempted end goal in terms of weight is going to be 2,500lbs.))

 

With that, I don't expect to come near this number on decreasing the travel distance of power. The second question is, with this considered, would it be possible to comfortably make this power output, without tapping into the bottom end or increasing the displacement?

 

The modifications I have planned for the top end includes, but isnt limited to,

E85 tune, Billet Fuel Rails, Upgraded injectors, High-Pressure Fuel Pump, Performance Ignition Coils, Performance upper/lower Intake manifold, Cold Air Intakes, JWT V2 Cams, Valves, Ported & Resurfaced Cylinder heads, Dry Sump Crank Pulley, Dry Sump Oil Pan* (Kinda cheating with this one). 

 

I think this number is decently achievable, but the more research I do, leads me to finding less and less 400hp N/A VQ37s, at least those without tens of thousands of dollars invested. Don't get me wrong, the estimate is close, but not just for an engine.

Apart from the questions above, I guess in general, is it even feasible? Does my theory hold any ground here? Will I need to start looking into the bottom end being build to make said power output? 

 

Any help/comments/opinions would be greatly appreciated!

 

Edited January 24 by hazesleepgod
Missing context

[dprada01]

I think the VQ37VHR is a great swap. Trying to make over 380whp is going to be a nice challenge. I would say possible, but the juice may not be worth the squeeze. 350-380whp is going to be bananas on an s30 chassis that is dialed in right. I would still jump into doing the swap even if 350whp was only decently achievable. 

[hazesleepgod]

@dprada01 Thanks for the input! Actually, much of this build is inspired and assisted by a fellow builder doing that exact project on his 240/280. I always loved the VQ, and the main goal is to overbuild (Originally, I was looking to attempt the 5XXhp mark and detune to 425*hp) and make a more reliable number as opposed to the constant breaking point. I also recently edited to add, this car will be about 900lbs lighter (3250 --> 2500*), due to it getting the full IMSA/GTO car treatment. Maybe I'll have to shoot a little lower, and hope for the best lol. I feel like I should also clarify, I'm dropping this in a Z31 chassis. The 80's odd child has a special place in my heart.