JZA70 Supra 1JZ VVTi vs non-VVTi - Swap

[iamawesome]

haha what are you on about? jz's dont have bad flowing heads. next you will be saying that an rb is better or something stupid like that. we built a few 2j's making over 1000hp

[Rookie]

Actually RBs do have better flowing heads, but that is beside the point. and yes JZ's do have poor flowing heads, IF you disagree I really don't know how to respond.

*disclamer I would much rather a 2jz than a RB26

[Rookie]

I did read the link, but remember the gas flow in ports is not continuous, in fact there are times where the flow reverses. Of course you might need bigger ports to support double the power, but what if you are after nice torque curve, and power near the factory figures perhaps 30% more power? There is no point in messing with ports on a modern toyota engine, unless you are after enormous power, which at that stage makes vehicle undrivable.

Like I said Sergei, IF it is done correctly you can get very representitive results from head flows. You can port a head to make it have more torque if you want, but IF someone who truely knows what they are doing, ports a head it will be better than factory everywhere, and more drivable. The car in the Link I posted came on boost 600 rpm earlier just from the ported head, that pretty much transformed it from a lag monster to a streetable setup.

[iamawesome]

do you have a flow bench? we have quite a few at work and have flowed both heads, 2j was a very good head. the only decent rb was the 26, all the rest are shit

[Rookie]

What were you numbers like?

[touge rolla]

Actually RBs do have better flowing heads, but that is beside the point. and yes JZ's do have poor flowing heads, IF you disagree I really don't know how to respond.

*disclamer I would much rather a 2jz than a RB26

I read the link and recall the users on that forum being quite excited at how well the JZ exhaust ports flowed compared to those nissanny things, what are they called again?

[FLAWLES]

Because they have been back to back tested against non VVTi heads and have flowed worse?!?....

proof
or do you have first hand experince with both heads?

[JustinSpiderholden]

I want to comment but have decided to bite my tounge

[FLAWLES]

I want to comment but have decided to bite my tounge

do it!!!!