Not yet, the guy that does my heads with the flow bench had to get the 2 sets of lower runners I gave him cleaned, he doesn't have a cold tank at work, they will be tested between now and wed/thurs hopefully. As for power porting the runner, your spot on Wiz, by power porting the weaker runners so they all flow the same, you get an even cylinder distribution under boost, some poeple will argue till they are blue in the face that the air will equalise under boost, they have obviously never read a set of spark plugs on an RB30 or any other engine with wildly varying intake flows, the ones that flow more air on a bench always read hotter/leaner on the plugs. On top of which, numerous engines that Andrew has done a manifold for have broken pistons on a certain cylinder first, and that cylinder that broke is always teh one on the flow bench that flows the most air. The reason being, and people forget this, is that there is a negaitive pressure wave at the back of the inlet valve on every stroke, no matter what boost you are running, the velocity of the piston moving away from TDC is such that it always does so, and in effect, the engine always see's the airflow coming into the engine as being sucked in, and the least retrictive port will pull more air in, hence run leaner. 6BOOST

ok say all runners are flowing evenly, and I know when andrew tests them on the flow bench all the runners are tested at once by mounting the sucker thing on the collector side. How does this show anything really, as that event never happens where all valves are open at once. If the runners were way different in cfm flow then yep it would cause a problem, however each injector can be trimmed to suit each cylinder with most management systems, it shouldnt get that bad if the tuner knows what his doing.

Each port is tested individually, not together, it shows the individual flow of each and every single cylinder. It is also almost possible to "guess" the trim needed for an injector without using 6 EGT probes and measuring the actual exhuast gas temp, and a lot of aftermarket computers don't have the function of individual cylinder trim. I have never found many tuners at all to use this either, the excaption being GTR skylines with a stock intake manifold, which most people add 3% in number 6 and 1.5% in number 5. 6BOOST

it blows me away how much 6boost knows. good stuff

kyle, which cylinder is it that always breaks ? because from what i have done, there are two cylinders which receive the most amount of air on the rb20/25/30. i can guarantee that any aftermarket rb30 plenum using standard runners demonstrates the same characteristics on a flow bench as standard, some more than others. i recently had the chance to look at the top of pistons of a customers cars (while the head was off and after some 2 hours on a dyno and making in excess of 490rwhp) and there was no sign of uneven fuel burn - which was also reflected in the burn pattern on the spark plugs - which, if you take flow tests results into account, you would have thought some variance in fuel burn would have been evident, but this was not the case (a pat on the back for the tuner in this case aswell) the reason for adding fuel to cylinders 5 & 6 in skylines is not due to the large amount of air being received by this cylinder which would contribute to a lean mixture, but on the contrary, and according to flow tests, this is the cylinder which receives the least amount of air and therefore, in theory, the richest mixture. the reason skylines tuners to do this, in my opinion, has nothing to do with the inlet side of the engine, but more to do with water/oil temps due to the lack of flow of both of these to the rear of the engine - on a dyno anyway. check out the nismo rb26 plenum and you will notice the different design at the rear of the plenum compared to standard to correct the lack of flow to cylinder no 6. just thought my 2 cents would help.

WOW!!! that has helped heaps but also confussed me....:S so kyle u think the best next mod for my car would be power porting runners...??? i have to o-ring the block and get different rods then i wanna do something to help power.... cheers

sorry about that. just hard to explain when trying to put it all in one post......a lot easier to say then type if you know what i mean Some original photos have not been recovered yet.

hahaha...nah its good man... once i read what u and kyle say about 6 times it makes more sense...

screw some boost in, then youll get some real power!!! 30psi+ dont be scared, can only go bang once.

hahaha...u love boost i wanna make more power on less boost....