That is a good point, but I doubt it has much to do with the increase in spoolup. The rod/stroke ratio with the 4G64 (versus using a stroked 2.3L 4G63) is much better, and there will be less losses associated with the piston side-loading. You have to realize that an increase of .4L of displacement is HUGE. Thats like having another piston in the engine (almost equivalent to the volume of another combustion chamber), mivec also helps the spool along. A good example is the setup Vigo posted above, a brian crower stroked 2.4L 4G63. The rod/stroke ratio is horrible, yet the GT35 is outputting full pressure by 3500 rpms. Having a awesome r/s ratio in a 2.4L 4G64 is just icing on the cake, and will allow for much higher revs, even though it probably won't need to rev high because it can spool up the turbo so quickly .

 

2.3 = 100mm crank + 150mm rod + standard bore pistons
2.4 = 100mm crank + 150mm rod + 60 over standard bore pistons

1.5 = rod ratio = 2.3 and 2.4

 

You guys are forgetting the torque spike that will be presentwith a Stock turbo and absent especially on a turbo as large as the 40R. You will not have 100% stock like spoolup, I mean a Modded IX is fully spooled MUCH MUCH faster then 3500, don't forget, many people get them into the 2900's or less.

Comparing to a 100% STOCK Evo, well Buschur overlayed his 35R kit against a stock VIII and it was better all around even with the lag, THAT was amazing

 

What do you mean by full pressure? 20PSI?

 

wrong. You are forgetting that a 2.4 4G64 is an entirely different block that has a taller deck height.

 

OK perhaps not full pressure but good pressure nonetheless =)

 

Here it is again. A GT35R with a 2.4L stroker reaching 20psi by 3600rpm. Only 100rpm later than stock.

 

oooooooooooooooooooooooooooooooooooooooohhhhhhhhhhhhhhh snap SON!!!!!!!!!!!!!!!!

You gots your A$$ punked down yo!!!!!!11!!1!1!!

 

I am definitely not saying a 35R will spoolup as fast as the stock turbo on an IX. The IX spoolup is simply just too fast to compare it to. What I am comparing it to is more along the lines of an 03 or 04 turbo setup. Lag is becoming less and less a problem for turbocharged cars as better technology comes about. I think the real ticket is variable geometry turbine housings. However no one can afford to develop a kit, nor could anyone afford to put one on their engine.

 

03 was quite fast with the 9.8

 

You mean the deck height that is made up by moving the wrist pin up on the piston?

If you notice on a "stroker" piston, the wrist pin is higher towards the top of the piston than on a stock 4g63 piston. This is the reason that stroker pistons are not interchangeable with stock pistons unless you increase the length of the rod.

 

you = simpleton.

 

That would be a waste of some extra deck height! =)

You have two options with the 4G64, use the same ol 4G63 150mm rod, or a 162mm rod in combination with the 4G63 stroker piston (available from magnus or other machine shops). Given the choice I'd always use the long rod 4G64, as many have already done. This way you get .4L of displacement and a better r/s ratio than the 2.3L 4G63 stroker setup.

 

You're correct and I agree that the long rod is the way to go.

However, you want to use the 156mm rod not the 162mm with the 2.4 unless you want your pistons to stick out the top of the block. The 162mm rod is usually used to create a 2.1L long rod motor.

 

Plenty of people have used the 162mm long rods in their 4G64's, although I am not sure which pistons they used, I was told that the pistons were 4g63 stroker pistons, but I'm not entirely sure that is correct. If you interested, call magnus, they've done it.