I am currently using the 5Zigen Fireball full ceramic exhaust system. So no cat back... BTW, the JUN III cams would be my first choice now following your advise, in this case, would i need to alter the ECU/Chip...i already have an aftermarket chip in the GSR ECU plus the APEXi VAFC Controller...is this sufficient?...would i need to change the pistons?..if so, what would be the best and cost effective..some advice me on either the H22A or accord pistons...your advice is greatly appreciated ...thanks again...

 

on putting them into a b20? easy, they wont fit

 

So your exhaust bolts directly to the header? I'm a bit confused here. Basically you want something with piping that is somewhere in the range of 63 to 65 mm inner diameter. As long as that's the case you're fine.

The VAFC should be reasonably sufficient to tune for the cams. You will see the best results of course, by having it tuned on a dyno. You can also see some gains by using adjustable cam gears and dialing in their timing.

You don't necessarily need to change the pistons but if you are looking to bump up the compression ratio that is a possibility. H22 pistons won't fit though since they are designed for an 87 mm bore and Accord pistons (assuming you are talking F22 or F23) probably won't work either although I don't know their specs off hand.

For now I'd stay with modifying the top end of the motor and see what your results are.

 

I will try for this setup...ITR head with CTR cams and aftermarket cam sprokets...for the pistons, i will elect 1997 Accord CF4 F20B (blue VTEC) to replace the B20B pistons...of course, there will be other mods to the block, etc...what do you say on this?...any advice?..

 

You can't use the F20B pistons, they're not the correct bore for the B20 block.

As for the head there's not much point in getting an ITR one if you plan on replacing the cams. The intake manifold, throttle and mild porting job on the combustion chamber are slight improvements over a B16 head but nothing amazing. A B16 head with JUN III cams would be a better idea, or hey if you want to run the ITR head with the JUN cams go for it. The cams are a big difference over CTR ones. The CTR cams are essentially identical to the ITR cams.

 

A Jun III cam or Toda Spec C is one of the targetted cams...however, would it be more logical, at Phase I, to modify the head/manifold/TB to allow for more 'breather' for the car i.e. ITR head, manifold, TB...than the stock GSR (with two butterfly)...then at Phase II, we will fix in the Jun/Toda cam kit....wouldn;t this ensure better life span of the engine..

 

I guess mainly I think along the lines of minimizing parts you have to buy and then replace. The main improvements of the ITR head are a slight port/polish job, the cams, the manifold, and slightly larger throttle.

Instead of buying all that stuff, you can have a better port/polish job done on the GSR head, install the JUN or Toda cams, get a throttle which is even larger than the ITR one, and replace the intake manifold.

The only negative I see to that approach is if you can't handle the down time of taking off the head and sending it off to be ported and polished. In that case you could get pretty much any spare VTEC head and have that stuff done to it. Basically in stock form the ITR head is an incremental improvement over the GSR head but if you're fully building up the motor, anything that makes the ITR head is most likely going to be superceded. There's nothing in the ITR head that will give it an advantage after both are fully modified.

 

Sir...i have thought high and low...i am using my B20B VTEC as a daily driver to work throught the daily morning crawl...i reckon by putting in the JUN III cams, which is superb, i 'll forking out gas at a substantial sum not to mention the constant prepping of cluthc to keep the car alive during the crawl with the JUN setup...so i'll start my mod with purchasing the CTR cams plus an aftermarket adj. cam sprokett...good enough??...when the dough comes in, i'll go further into the mods...

 

Well hey, it is your setup so do as you please. I'm just offering suggestions.

The thing with VTEC is that even when you get into the more aggressive cams, you maintain a reasonably good idle, and fuel consumption isn't so bad as long as you stay below the crossover point most of the time.

 

cheers MrFatbooty...your advice is well heed and taken..now back to the drawing table and budget again..