ok..... i hate these type of threads, but imma make one anyway.... i have wut u see in my sig... i have sitting at the house a ported and polished head from south florida machine shop with 78lb springs.... i was planning on also slappin on some 10:1 diamond pistons... how much power do u think i can put down with that setup.... which takes me to another ?.... i plan on goin TVS.... should i stick with 9.5:1 or would it be ok to go 10:1.... i wanna know if anyone has done this and if the car has been reliable.... o i also forgot i also have a stg 2 snow performance meth kit imma throw in there.... just waiting for my vaca to get to work

 

i would love to see the dyno number of a ported head in a stock motor

 

you should send the head to me solves all your problems IMO

 

are you gonna rev it out anymore with the springs?
id say at least 50 over where you are now with meth 60 over where you are now, if you rev it out to 8200 without cam gears then you wont see much of a gain but if you get cam gears prob another 20 over that....

so if you have 250 now with ported head about 300 with meth 310 with cam gears and rev it out prob 330....

but i could be way off

 

i was planning maybe 7500 to 7600

 

Cam gears do not add power, they change where you make it

 

stick with the stock compression ratio for Pistons

 

^^^

 

There have been so many different people putting on a ported head. All the gains should be in the tune that you're using. I'd say 35whp. At least you guys have good shops local to send heads to. Did they flow test it too?

 

true... but you can adjust the power curve further down the rpm band and thats where the power comes from. stock cams with cam gears will make power up to or even past 7600 where stock cams and stock cam gears stop making more power after about 6500

 

i didnt get it bench flowed.... but it looks real good... i have pics i just have to get off my lazy ass and post em..... richard over at SFMS told me that he thinks he could get an easy 25-30 hp gain from the full porting and polishing... still even after the porting, the exhaust side of the head looks small, but atleast its gasket matched and he ported and polished it all the way thru... i was hoping for somewhere close to the 300hp mark... i will be doing the tuning

 

slap on a 2.6 and meth and you'll be well over

 

i have a 2.6 pulley that i used to have a long time ago until i saw how hot my iat2 where getting..... and then i took it off..... so what are ur guesses for WHP numbers?

 

iat2 will be much less with ported head and meth. do the 2.6

 

i really wanna rape this m3 at my job that thinks he has the hottest **** in the world.... its a e46 and he beat me by like 1.5 cars.... he had intake, header, exhaust, and pulleys..... and hes been yappin since then.... so im determined to walk him

 

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We've been seeing 20-25 HP. The heads flow well from the factory and there are other restrictions that are going to keep you from making 50WHP. We have a car here now with head, cams, all the mods and I think it's only at 280WHP. Working on getting more but the gains are not huge from the ported head.

Forged pistons at the same compression ratio will make slightly less power than OEM pistons. Compression suggestion is based on boost you want to run. I probably wouldn't raise compression if you are going TVS but the pistons will not 'make' power.

So if I were just guessing, which is impossible w/o flowing and CC'n the heads, I would guess about 20WHP from the heads (unless you do a header match, then a little more) and lose 5WHP from the pistons at the some compression ratio (all mods the same).

 

that sounds a little lower than i expect, but i appreciate ur opinion....... i would be pleased with about 280whp.... how much are u revving the car up to?

 

I'll see if I can find the dyno. We've been dyno'ing crap all day every day and different guys have been operating the machine. It's hard to organize and make notes. Then creatings a matrix of mods and how they interact can be very hard but it's needed to take these cars to the next level. Not enough good info and unfortunately some reverse info on the forums. I can say that we have a lot in the works, we passed the M62 HP record some time ago, we're staying quiet on a lot of up coming products to protect intellectual property, we've done enough TVS, turbo and M62 testing to know what we're talking about and yada yada. Now on to look for that dyno graph...

Edit, found some charts.

Gain of 37WHP here is a little decieving because we had to do a lot of work on the car. We changed quite a few things including upgrading from a CA?? header (2" outlet) to a ZZP unit and change the catback. There were just too many restrictions to get much in gains originally. Important to note is the difference in power curve. The torque was a lot flatter on the head/cams dyno. We stopped the pull at 7600 rpm and it was still climbing. We didn't want to go any higher w/o our balance shaft delete in. So take it FWIW.

 

on my car stock pulley with a shitty header, and cai I made 50 whp gain it was the rebel build well ex rebel build. I am running the M2 race head that can be purchased from ottp I highly reccomend them and the head.

 

how do you lose whp with a piston swap if the compression is the same? The aftermarket pistons are going to be lighter,so you will have a lighter rotating mass you should gain 3 to 4 whp not lose.

 

I just read this thread too. When I saw that I was like wtf??? I was gonna ask the same thing. I hope zzp has a good response because I've often heard that zzp is the last company you want serious tech advice from.

 

Hypereutectic pistons have a lower expansion rate which allows you to run tighter clearances when compared to forged pistons. This results in more HP potential in most cases.

ZZP is one of few companies that will give it to you straight rather than doing things like telling you that you will gain power if you buy forged pistons from us. Unfortunately, this forum as a whole is full of misinformation and mob mentality, thus you feel as though you should ignore advice from ZZP when we are the ones doing the most testing/learning/reporting accurate information in this market.

 

i wasent bashing nor will i ever . I was just wondering.

 

no he is right...... the stock pistons are made outta a dif material, i believe they are eeutectic aluminum pistons, which temp are a little hotter and allow for better combustion and a little leaner mixture... the forged pistons run a little cooler and are safer to run, but theoretically decrease slightly the combustion process....

that is right... but one of the downfall to this material is that it is strong, but brittle... meaning it is not a very flexible metal, so thats y they break easily... forged pistons can withstand the punishment and heat better without breaking