1st or 2nd gen head

[Skusssssh]

ok everone i need a little help here. ive always thought that the 1st gen head flowed better than the 2nd gen but recently i have had a friend tell me that the 2nd gen head flowed better so does anyone know which one actually flows better or a site that i can visit that has actually done a flow test on both and has the data posted.

thanks,

 

[squeak104]

Our site tells you. Part of the way down the page.

http://www.dsmtuners.com/sub.php?page=1g2gcomparison

 

[nightspeed87]

The 1g head flows more air stock for stock because of the bigger ports but some argue that it hurts low end torque. The 2g head has better air velocity for low end torque but less all out high rpm potiental. The 2g head is a more efficient design for the street I believe, but ive heard that a fully ported out 2g head flows like a ported 1g head but still has its low end effectiveness. A fully ported out 1g head possibly would be more useful on a all out drag car that only cares about high rpm hp anyways. I figure your asking because your doing the 6bolt swap, so Id say just use whatever head is easier to use without issues ( considering the cam angle sensor being different. )

 

[gsxeclipse97]

Well there is a way to gain more tq with the 1g head by using a cyclone intake manifold you keep your low end and gain more top end then you would have with the 2g head. Just most people are to lazy to run it correctly. I have one on my car with a ported 1g head and it runs great. you can really tell the difference up top if you compare the 2g head and 1g head.

 

[Boo5t_Addict]

The 1g head does have larger intake ports, but the airflow on a 2g head into the combustion chamber is more direct. Air will flow quicker when there are less bends. Modified mag did a 2g head on a 6-bolt on their project 2g Talon TSi for that reason. But both are good. Modified argued that the 1g head will generally make a higher peak horsepower rating, but the 2g head will have a slightly flatter torque curve. If you were to really analyze it, I'd stop and ask if you were going to use the car for drag racing, or somethign like autocross, and whether or not you want to bother. Either one will work well for you though, these 4g63 engines are great.

 

[96gstdsm]

I am currently doing my 6 bolt swap and using my 2g head. I looked into the 1g vs 2g head quite a bit before deciding which way I wanted to go. From my searching and talking with experienced engine builders etc. I got the general consensus that unless you are going to be pushing out like over 400 hp, then the 2g head over all would perform better, at least for like street driving. Mine being a daily driver that is what I wanted. The 1g head would flow a little more, not better at higher rpm's but only really noticeable after you are already running pretty high horsepower. The 2g head has much better flow patterns than the 1g but not as big of ports. So you get more torque with it, but once in high hp might lose a little up top. I could have been misinformed but spoke with some pretty reputable shops. Was a no brainer for me since I already had my 2g head and just needed a 6 bolt block then as well.

 

[gsxeclipse97]

Thats is true that the 2g head is better for tq but like i said in the post above the cyclone does basicly the same thing. I noticed a large difference in spool up time from 2g to 1g head. at 15psi the car seems much faster now than it did before but thats just my opinion

 

[Hop]

591AWHP on a ported +1mm Magnus 2G head. I'm not complaining... much. That last 9AWHP does bug the hell out of me though.

 

[50ul H4ck3r]

6 bolt engine all the way

 

[Boo5t_Addict]

6 bolt engine all the way

Please elaborate on this. He was asking about the flow differences of the 2 heads.