I'm thinking of taking this N/A thing a step further. But machine work is something I know nothing of.

I'm considering porting and polish one or all of the following.

MEVI

Lower intake

Cyl heads--this would only happen if I decided to get cams/valvesprings.

Anyone?

 

I think ither delio or confused did this..

 

I think Extrude honing the upper and lower manifolds costs about $500. For the heads I don't know if I'd even bother unless you were going to completely disassemble the heads and do a valve job. And while you're in there, you might as well try and figure out a way to bump up the compression a light bit. Sounds like a lot of trouble though. I think you'd be happy with the ported manifold and cams alone. IMO, that's where the bigger gaines typically come from on other motors. Full length headers may be here soon too if the 5th gen manifolds do indeed bolt up to the 4th gen block.



Dave

 

IMHO porting the MEVI won't do much if anything. Your money is best spent on headwork + cams. However I'd recommend just buying a spare VQ30DE and putting in 11.1cr pistons, along with headwork + cams. This saves downtime and would make the install easier. The only downside is that your car will have to be tuned with the 11.1cr and cams.

Unless you goto JWT and have them tune the car you are pretty much SOL. That is if you can figure a way to modify the ignition timing. I've noticed that the VG30 and SR20 make more power with cams if the timing is set at stock or slightly retarded. Then again this is only in certain parts of the powerband you would have to do a timing sweep to determine the best overall curve. I believe a CONSULT II should be able to adjust your base timing from 13-17*BTDC or (-1 to +2). All you'd have to do is each run with a different setting while looking at the torque. Once your finished find out which settings give the best torque curve. YOu can even get a printout of what the CONSULT II reads.

 

There are a few different routes you can take on this.

1)You can do it yourself and save some money.
2)Send it to Joe's Garage where they kinda know something about it and have done some of this work before.

3) You can send it to a proven reputable shop who has experience with porting cylinder heads and has the flowbench to prove it's worth.
Someone with a die grinder who knows how to hog out the ports isn't the answer. You can do that yourself and have fun doing it.
And from what I know I would say that DPR is among the worlds best for that type of work. But keep in mind it's difficult for anyone to get decent gains out of Nissan heads because they usually flow extremely well from the start.
Nissans do however respond very well to a good set of cams. And for the money at this point that's probably your best bang for the buck.
A cheap mod you may want to try is to shim your stock valve springs 1 or 2mm to help avoid valve float since you're running them at higher RPMS. If you get cams you certainly should change them out altogether.

 

an extrude hone on the stock intake manifold is around $500 I think, but I am not sure if they could even do the MEVI effictively? Since you are running high rpm with the 7200 rpm limit, you could possibly see 10 hp on the top end, but it might not be worth the money. I think keven97se has a before and after dyno, but that is with the stock manifold.

*edit*
I just went to extrudehone.com, and they have prices listed. Looks like $675 for the upper and lower intake manifolds for stage 1, and then an extra $80 to gasket match the manifolds. They also have cylinder heads listed for $700.

 

My friend just got his cylinder heads ported at a local machine shop who knows what they are doing it cost him $120 for a four cylinder head.

 

nope, extrude honed quoted me almost $700 even after I told them I didn't need the bottom done. they made warranties for the mevi.. too big of a gamble for very little potential.

 

did del do it? Mr.

 

Headwork would run between $300-1500 depending on what you want done and how much you can afford. In total you should be investing around $2000-3000 for cams + headwork + install. I say buy another motor and stuff new 11.1cr pistons in it. If you are going to stay NA might as well go hardcore .

 

Isn't a cheaper way fro raising compression just to have thinner head gaskets? Alot cheaper than new pistons.

 

Naw man... no head gasket is tops.

 

1hotmax paid 400 just to have his manifold polished, not too sure how much more to have it ported

 

2 to 3 thousand, just to mod the engine of a car that is not capable of betering 13 sec. Call me crazy (or mabye not enough of a maxima fanatic) but I'd rather spend that money on an actual race car than a sporty street sedan.

then again my max would probably only bring 4000 sale anyway.

 

They're talking about the inside (performance) not the outside (bling)...

 

I think the 4th gen max is very capable of running faster than 13sec N/A. It's just nobody, at least here, is yet to spend the time and money to do it.
Why? You wonder. The look on peoples face when your at the track and Neal is running mid 13's is enough for me.

 

A race car would take 3-6 times that amount easy. The price is so high because of the DOHC setup. JWT cams cost $1100 because you have to 4 of them. On I4 or SOHC V6s they are $600 retail. Another way is to have another company regrind them. That is a cheaper but where do you get the cams? If you don't have a core motor you have to buy core cams and that ends up being the same as the JWT cams price wise.

 

your and some of your comments are amazing

 

say whut?

 

read what I quoted

 

Neal I know of a good place in Tinley Park, IL. The thing is, your car would be out of commission for a while. They would probably do head work pretty reasonably.

 

DPR qouted me 1200-2400 depending how wild you want to get. To rich for my blood. I can just change to a bigger nitrous jet

 

 

Well, since I cant take my whole blown motor, I am taking the heads, and intake and exhust maniolds. So, maybe I'll be able to toy around with all this stuff. Lord knows I'd like to....