but even at 300 whp, pistons and rods are all that are really needed? Nothing else would really be neceassary? If I do make the decision to go FI, I'd rather error on the side of caution, than potentially get stuck with problems down the road. Thanks for any input

 

What killing the tC man is the FE head. 2AZ-FE FE meaning Fuel Economy. Small ports.


Now do you mean the 06+ Si's or the 03-05 Si's? The k20 that was in the integra was probably a k20a2 w/ k-pro to disable the immobilizer. Now the 03-05 Civic Si's and 02+ base RSX's used a k20a3. The a3 denoted an FE style head with vtec lobes of a lesser lift. k20a2--> 200hp, k20a3--> 160hp. Now the k20 in the 06+ Si's are a k20z. 197hp




Oh, you also have to take into consideration boost on a k is def gonna be more responsive because honda is notorious for high compression. The k's run like 11:1, i believe, 10.8:1, something like that. while the 2az is only 9.6:1

 

vvtl-i is also incorporated into not only the intake cam, but the exhaust cam as well. The vvt-i on the 2az only activates on the intake cam.


That's how these hondas have that signiture, "BrrrrrrrrrrrrrrrrrRRRRRRRRRRRRRRRRRRR!", exhaust not.

 

I am aware of it's control on the exhaust cam. You also may have wanted to mention the fact that the new si, rsx type s, and tsx use a 3 rocker assembly. The other fuel economy heads use a 2 rocker assembly.

 

Yea maybe they should have put a Celica engine in our cars instead. Anyway I have decided to purchase a stock engine from some guy I know. II am going to do the head port polish Ferrera Valves, I am not going to mess with the cams vvti can be a real pain. I will probably have it done in a couple of months. I have to fix this boost creep crap and leak first. I hope it makes a big difference. I am also going to put pistons and rods later next year I want to make a least 450-500whp

 

After talking with our reps at work on a few occasions the main reason i was given for the choice of engine was torque. When comparing the celica and the tc the tc is considerably heavier and with the celica engine would not have been able to get out of its own way. The celica engine is a good engine but lacked in the necessary torque. If only they had just created a new motor that incorporated the torque of the 2az and the vvtl-i of the 2zz we would have had a monster for a power plant.

 

/\/\ word.

 

dang...imagine a tC on 20-22 PSI......heck 14 PSI is pushing a lot of hp on the 2az...


give it time man....civic have been around forever, tC is going into its 3rd model year.....

 

uh, k20z in the Si is newer than the 2az, and whats with every other tc owner comparing the tc to a civic? Its been like that since it came out, and whats with everyone wanting to compare vvti to vtec? Two completely different systems reguardless of its simularity with the cams.

I keep saying it, i hate the 2az and as i've always said, the 2az's potential isn't that great. Sure it can make good numbers, but at what cost? Time will tell. I know rythmn wont ever admit that the 2az isn't as great as he believes, but i actually agree with you on one thing. High compression and high boost is a death trap. Lower the compression, and do minor upgrades with the internals and that 500whp would be much more reliable.

I keep getting sh_t on here, yet it always seems what i say is proven at a later time. Supercharger is crap for the money. People gave me crap, until people started having various issues. Supercharger is a waste on the auto, gave me crap until someone posted numbers.

 

Thats what I am sayin

 

but jumping back into the conversation earlier. wouldn't a zpi stage 1 or 2 head help out immensely?

 

I still havent seen dynos of those different stage heads so I'm unsure what it does yet. But yes a ported head will help. How much? I don't think anyone really knows because I have not seen any before and after dyno comparisons. If I misseed it I'd love to see it. We're currently designing new head packages as well so I'm looking to see what has worked and what doesn't. I know we're taking our time wiht our race head upgrades.

 

Yea I am interested in seeing the difference, funny how come this never came up before? I was going to purchase an engine from a guy but he sold it. How long before you guys finish with yr head?

 

Maybe I can talk kenny into sendin me a stage 1 head and ill do a predyno with my stage 1 turbo and then redyno after I put the head on. ill see what he says and let you guys know.

 

Are you sure it's 20-22 PSI for a stock STR-4? One of my best friend has one and we seen 8 PSI on the SRT 4. My other friend has an EVO and is pushing 16PSI. I got say I love the EVO now

 

I agree with you rhythmnsmoke

 

I agree with you too Nu_ERA
I heard about the Supra owers spend alot on their heads also.

 

The reason for lower horsepower could be related to a variety of reasons. Engine management, Air/Fuel ratio, exhaust flow and back pressure, intercooler size and turbo boost. Plus, consistent performance is more important than 501 hp dyno runs. Who knows how that car would run after heat soak.

Also, are you considering how much was invested in that car compared to yours? And what the owner of that vehicle could have purchased with the money invested+the car? 25k+ for the car (probably 27,000 out the door), then maybe at least 10k in modifications and tuning. He could have bought a real car, ie, STi, Evo or Corvette. Cars that can turn and accelerate consistently.

I sincerely doubt that Acura was running with stock internals. Forced induction cars can't run with 11:1 compression, they need the lower compression to compensate for the higher amounts of air being forced into the cylinders. If it was stock, I wonder what kinds of issues that car is having now.

Stock maximum boost is 15 psi for Dodge SRTs.

Evo's boost 1.5 Bar all day, thats almost 21 psi.

 

After more reaserch it is 11-14 psi, my freind likes to tell fish stories i guess if you know what I mean.

 

Not trying to flame you, but you should check your facts before you post.