I am wondering what kind of power differance I will get on a B20 w/ Drag gen 3 turbo kit if I use a 00 Civic Si head compared to the ITR head I really want but cannot find a reasonable price on. I am looking to boost 15 + psi and make 350+ hp. How much differance is there in the cams, intake and T/B? Do I need to upgrade anything on the head to make this kind of power? I have hondata& 550cc injectors.Thanks


[Modified by magicwand, 7:28 PM 10/8/2002]

 

Theres a difference. The cams are more aggresive, the ports are gone over by hand at honda, and the throttle body is larger, I believe. If you're boosting it might be worth it to go with the cheaper head and spend the extra money on other turbo stuff tho. Not sure what'd be best for you tho.

 

thanks, anyone else have any experiance w/ this?

 

unless you can get the ITR head for real cheap then i'd go with the SI head.
the cams are still ok for F/I and the head flows well, close to the ITR. you could ditch the IM and throw on a JG or the like for better F/I flow. also could opt for a P&P job for turbo that would be better than the stock ITR head.

the B16 head plus better IM and a bit of head work could be not much more $$ than a newer complete ITR head. depending where you look of course.

go for what fits your budget since they are both good heads.

 

thanks for the reply...will the stock B16 be able to flow 350 HP?

 

b16 could easily flow 350 if done right...i dont see you getting 15 psi from an 11:1 compression itr head...pesonally i think thats way too much pressure

 

u could either do the ITR head and swap in GSR cams and already have upgraded springs/retainers or just get a B16a head and do springs/retainers urself. either way, get that head revving high, thats where it likes to make all its power. but wait, u have a b20 block, gonna take alot of prep to run that thing to peak power potential of the car. but what am i talking about, just rambling, all u want is 350whp just do stock B16a head rev it to 8k @ 15psi u should make 350.

 

There should be no reason why it couldn't. There isn't enough difference in the combustion chambers to make that much of a flow anyway. I would take the money that you save on the type-r head and get the b16 head ported and polished instead. You'd have HELLA fun with it then

 

I am using JE 8.5:1 pistons. (when used w/ B16 head)Does anyone know the C/R if I use ITR head?

Is there gonna be a lot of differance between the ITR and B16 cams? Does anyone have the specs on these cams?
Should I go with Skunk 2 or ITR intake manifold over the B16?
How much power differance will I see between the 60mm T/B as opposed to the 62mm T/B?
If I go w/ 62mm should I spend the cash for ITR, GSR, or Edelbrock? Thanks


[Modified by magicwand, 9:32 PM 10/11/2002]

 

the B16 and B18C5 heads are the same casting, so the C/R will be the same using either head.

yes there is quite a bit of difference between the C5 cams and the B16A cams. the C5 cams have more lift and duration (don't remember the specs offhand). the GSR and SI cams are almost the same profile.

i'd go with the Skunk2 IM for a N/A setup and a JG for F/I.

a 62mm TB over a 60mm TB isn't that much of a difference but you will notice it a bit. i would stick with a GSR TB and just tunnel it so it's a more gradual flow through it. it won't be "overbored", but you don't really need it unless pushing alot of boost. ITR is a bit larger but can cost too much $$ most of the time, so look around for a good deal.

 

The GSR and SI have the same exhaust cam specs.

 

hmmmm....thanks for the info.
any suggestions on cam choice for FI?
Type R or Skunk inner springs and retainers?
I am looking to make 350hp with the potential to boost into the 400 range (if the 550cc's will allow it) Thanks guys

 

Lots of people say get stock 94+ GSR cams, I'm just going to stick with stock B16A3 cams and see what I can put down.

For 400 whp, IMHO you will be testing the outer limits of your 550's, I think you could get away with it though if you increased your base fuel pressure. Are you using engine management, or an FMU/FPR setup?

 

I am using a Hondata 2B. I have considered using 720's but I already purchased the 550's when I purchased my turbo kit. That was before I wanted to go as far as I am going with it..kind of like a virus that grows every day...I am still riding around 125 of Honda's meanest horses(haha)

 

I have some used 720's if you want to trade for the 550's. 720's are going to be too big for my goals. I could still use them if I had to. They are good for ~450 whp @ stock fuel pressure.

 

the combustion chamber might be different on the ITR head than the B16 head. Its possible, but i dont personally know.

Marcus
mpoweredbyvtec@aol.com

 

Thanks, but I don't want to infect my project with any used parts (haha) just kidding...If I do anything I am gonna try to swap and pay the money to boot for new ones. Thanks though

 

If you plan on running high rpm's go ahead and get the Skunk 2 springs. They are a stiffer spring, and will allow you to run high rpm's safer than the type-r springs. This also decreases the chances of floating your valves as well. I would recommend usnig the Skunk 2 retainers and valves why you have the head down. Even if you have to save up a little extra money, it is well worth it in the long run.



[Modified by armrslr, 6:23 PM 10/14/2002]

 

Are those Skunk retainers titanium?Is that safe (reliable) for daily use?

 

The difference between B16 and C5 is the C5 the bowls are cleaned up by Honda
No big deal
I suggest Ferrea valvetrain kit IMO
A good porting job won't hurt either

 

what kind of differance should I expect with aftermarket valves?how sturdy are the stock Hondas? are they a MUST for 400+ hp


[Modified by magicwand, 10:43 PM 10/15/2002]

 

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