wow! nice work. finally..

the beta head has been a huge restriction forever, especially for n/a guys.

now lets find a company or person that knows what they're doin to get this done for some of us!

 

what kind of places do this stuff?

 

most performance head shops will do it

call up a machine shop and ask if they have a flow bench

i was quoted 800 for the whole thing(port match, port and polish)

again extrude hone does awesome work for a really good price

 

well, random did say he expects the beta 2 head to flow about 5% better, so its only about a 10hp gain.

 

Well, it would have been about 20-30whp if we were starting with 240whp base, but we only have 140 after I/H/E that most of us have, we should see about 10-15whp I suppose.

 

Let's assume you have an "average" modified Tiburon (IHE). You'd be putting down about 140-150 WHP.

A head job like DMDICKS had performed would get you about 14-18 WHP AT BEST. In reality you'd see about 8-12 WHP.



If you got a REALLY GOOD port/polish job and got the flow's up into/above the 250's intake 230's exhaust, you'd be looking at about a 28% increase intake and nearly a 40% increase exhaust

THAT would get you more like 30-40 WHP AT BEST In reality probably closer to 15-20 with the stock TB and Stock Intake Manifold. You'd need to increase the flow ability of those 2 components to allow the head to breath that much better. Put a Air RAM intake manifold and a 70mm TB on there, and you'd see better gains. Then of course, these flow rates are with the stock cams. Just imagine what the gains would be with a set of longer duration, higher lift cams?

Then of course...there's the problem of ECU tuning. How is the stock ECU going to like the new better breathing head? Are you going to run lean all the time like the other folks have problems with or will the ECU "learn" to like it? Based off the problems the Turbo guys have had with the Stock ECU and piggy backs... I'd say you'd probably run lean.

So that really rules this out for mos of you guys. For the guys willing to spend the $$$ on a stand alone, it might be worth a try.

 

Note before I talk, that factory-N/A inline-4s are not my best area of expertise... I'm still learning about the gremlins of this ECU and haven't pushed my car to where its really a problem.

For the average port/polish work, I don't think even a piggyback is necessary, although its a plus. Of course when you start really messing with it to the point where your almost overdoing it, and including higher lift/duration cams, then I can see a wilder piggyback (SMT-6) or standlone (Haltec) coming into play.

For the weekend track warrior, I don't think thats the route many would take. Going and getting the ports opened a little and polished for a short path should yield a decent gain (~5-8whp) and not sacrifice a lot of daily driverability.

 

Sorry, I didn't mean to make it sound like you would need a stand alone to get headwork done. I was refering to the combination of headwork and cams.

 

Yeah, that's why all the shops in Korea recommend ECU tuning if you get aggressive cams.

So, who's gonna swap to a Beta 2 head for us, get it dyno'd, flowtested, ported/polished/grinded, and flowtested/dyno'd again?

 

i wanted to get a beta 2 head and do this

but bench testing is expensive