I'm about done with the first head. I matched ported everything, unshrouded the valves, open up the exhaust side a bunch and polished the exhaust side and above the injector on the intake side. Once I'm done I'll get a valve job.

I'll be using the following parts...
- eagle rods / 10-1 JE pistons
- JWT C2 exhaust cams
- E85
- ported/polished intake and GTR injectors
- ported stock manifolds for now, they should flow as good as any short tube header

 

Great stuff man. I would like 350whp would be easily attainable with a good intake and exhaust setup.

 

So you are going to use bigger injectors and fuel pump for e85 right

 

GTR injectors and a stock pump for now

 

You'll need another pump dont think stock can pump enough e85. I would also upgrade fuel lines and fittings

 

So I got some questions.

-What are your goals is this suppose to be an NA build or is boost the endgame here?

-You said 10-1 pistons does that mean you are lowering the compression to 10:1? If it is 10:1 compression more boost friendly but you will make less power NA, likely a 10-15hp drop in power NA.

-Head work, a good port and polish+a decent 3-5angle valve job will make some more HP in an NA applications there is really no use for it if there is any form of boost atleast for a street car. God only knows how much more you will make just depends on how good the work is, but remember these cars have really well designed heads so i would not expect that much more. If boost is your goal i would say stop with the head work focus on other areas, it will be a better spend of your $$.

-If you are going to this extent to build the motor a walbro 485lph cost $100 with an install kit, cheap fuel insurance. with the money you are already spending. i have one i am planning to install because i am about to run GTR injectors and E85 on an unopened motor.
https://conceptzperformance.com/walb...85_p_14136.php

-Where did you get these GTR injectors? Be extremely careful with GTR injectors, there are so many fakes floating around, so if you have a set go have them flow tested even if the person before you said the flow tested them, YOU go flow test them make sure they are actual 550cc injectors. the only way i would trust a set is if i either watch them get pulled off a running GTR or if i bought the directly from the dealer.

-Just buy a set of headers, by porting it you are removing material from the OEM manifold, meaning you are effectively weakening the metal, especially with the constant heat cycles they will be a lot more prone to cracking. Its not a common problem but the OE manifold has cracked before, so making it weaker is almost guaranteeing it to crack. And it is a HASSLE to take headers on and off these cars dont put yourself through repairing a cracked manifold. if you dont want the Z1 or ISR headers etc what have you because those are too expensive, get a set of the DC headers those will make more power than a ported OE manifold, and the DCs are floating around dirt cheap, Also 350Z stuff fits and there are many options there as well, so i really cannot understand keeping the stock manifold just seems like a waste of effort to me.

This project sounds interesting and maybe you have explained it in a post before but i just haven't seen it but it seems you have no real goal so its just random stuff happening.

 

I agree with most of your comments. The goal is to handle 20psi eventually. The port work I'm doing myself so just time invested. I've already decided to go with aftermarket headers, bigger injectors and add a fuel pump now. I was going to upgrade the fuel system later when the FI is installed. Car will most likely be NA for awhile so I can break it in and make sure supporting mods are installed.

 

That is still not explaining much 20psi on what? 20psi from a Garrett GTX4294R is very different from 20psi on a K04. That garrett will immediately send your rods through the side of the block while the k04 will likely choke the VQ. I assume you are not talking about a S/C 20psi will be soo badly overspinning it. instead of speaking in terms of psi speak in terms of horsepower and torque, that way it will be easier to achieve your goals. you'll get more people able to advise you on what to do. If E85 is the fuel of choice you want to use likely you can make around 7-800whp before you start running into detonation problems. i don't think it will really be necessary to lower your compression, even though 11:1 comp is a bit high for boost there are quote a few 3.7s running around on this compression making great power all day. So its all dependent on what your goals are.