Alright, I just want to see what kind of info people suggest to me.

First I am planning on rebuilding my engine(due to oil consumption and km's-doing comp test this week).
I am looking for a bit more power but would like to remain reliable...basically looking to upgrade to ITR cams.
I am able to get a 2000 ITR head with 55,000km on it. I was originally thinking of taking the head and putting it on my b18c1 block. My block is going to be taken out and get a basic rebuild with .25 oversized itr piston(usdm).
Here is the thing...I have an itr IM and was thinking of putting the itr head on but I am not too cool on the idea of manipulating the throttle body(gsr one) and getting a new computer(itr-single runner IM). Then I though why not take the gsr head and take all the internals of the itr(which are much newer-except put in new seals and gaskets) and put them in the gsr head...and then sell the bare itr head and valve cover which should help with the cost(I can get the itr head for 800$ canadian~575$ US) and I can sell my gsr cams to boot. This should make for a much simpler engine install and keep costs down. I am pretty sure all the itr internals are the same as the gsr, some parts are better. At the same time I am putting in a new clutch and itr flywheel....and new engine mounts if needed.
This should allow me to have more power, a fresh engine and honda reliability. I should have a nice healthy midrange and a good highrange power. And it will still look like a gsr

Any thoughts and the like are very much wanted...I want as much info from people as possible.

Thing is I want to keep the costs of the rebuild as low as possible(as we all want to). I need to save for my future! wedding, wife, house, dog....

I have a 94 gsr with 250,000km with I/H/C/E
4-2-1 rsr header, 2" carsound cat, 2.25 exhaust

 

1st..about putting the ITR head on the gsr block..with ITR usdm pistons..comes out to 10.6:1 compression. but a gsr head and gsr block with itr pistons equals 10.8:1. or jdm ITR pistons in the gsr for 11.36:1

2nd..about manipulatiing the gsr throttle body..if U use it on a type r manifold(or a skunk2 manifold for that matter) you get the type r throttle cable and bracket, and a non-gsr throttle pulley(92-95 dx civic for example). and run a chipped p28 ecu for single stage vtec.

3rd. about putting type r internals in the gsr head.i heard the valves size is somewhat different.but i'm not sure on that.they seat flatter or something..not really sure though.

i have a gsr with type r cams/springs, just got a skunk2 mani. using the ITR throttle cable.bracket, and pulley. and a chipped p28 from a 95 ex civic.

go to c-speedracing.com -then to the how-to section, and check out the compression calculator.

about the internals being the same..NO..there's a comparison of how different the cranks are between the 2 on honda-tech..search for it..and the connecting rods are lighter with a anti-friction coating.

remember-all b16's,b17's, and type r's have the PR3 head.just the itr is hand ported and polished.the 94+ gsr b18c is a p72 head..the manifold bolts up different than a pr3 and a gsr head makes more compression.

there's 1.1 cc's less combustion chamber volume in a gsr head than the pr3.

all this should answer your questions above and provide some useful info.

took about 20 minutes to type this(even got cut off the internet during typing)-dial up

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by darrinbrewer &raquo;</TD></TR><TR><TD CLASS="quote">
1st..about putting the ITR head on the gsr block..with ITR usdm pistons..comes out to 10.6:1 compression. but a gsr head and gsr block with itr pistons equals 10.8:1. or jdm ITR pistons in the gsr for 11.36:1

2nd..about manipulatiing the gsr throttle body..if U use it on a type r manifold(or a skunk2 manifold for that matter) you get the type r throttle cable and bracket, and a non-gsr throttle pulley(92-95 dx civic for example). and run a chipped p28 ecu for single stage vtec.

3rd. about putting type r internals in the gsr head.i heard the valves size is somewhat different.but i'm not sure on that.they seat flatter or something..not really sure though.

i have a gsr with type r cams/springs, just got a skunk2 mani. using the ITR throttle cable.bracket, and pulley. and a chipped p28 from a 95 ex civic.

go to c-speedracing.com -then to the how-to section, and check out the compression calculator.

about the internals being the same..NO..there's a comparison of how different the cranks are between the 2 on honda-tech..search for it..and the connecting rods are lighter with a anti-friction coating.

remember-all b16's,b17's, and type r's have the PR3 head.just the itr is hand ported and polished.the 94+ gsr b18c is a p72 head..the manifold bolts up different than a pr3 and a gsr head makes more compression.

there's 1.1 cc's less combustion chamber volume in a gsr head than the pr3.

all this should answer your questions above and provide some useful info.

took about 20 minutes to type this(even got cut off the internet during typing)-dial up



</TD></TR></TABLE>
what honda tech is alllll about.

 

I am going to go with the itr head and IM(itr). Just seems easier to do and I can still sell the gsr head no prob.

 

just check out c-speedracing.com 's compression calculator..to play around with different head/block and piston combo's...lots of info there..

 

Good post Darrin

For the price and what comes with the head, I would definitely put ITR head to use. Like darrin said the cable and brackets are no big deal and a chipped P28 isn't that expensive. Performance will definitely be improved.

Are you going with JDM or USDM ITR pistons?

Oh yeah and if you do decide to use your GSR head- let me know when you sell the bare ITR head

 

I am going to go with USDM itr pistons...don't want to go overboard. I am going to have to check into the p28...people keep talking about this. I though I could just use my own ecu(gsr) unplug the iac and tune it with a vafc

 

Pretty sure you'd throw a code, but I could be wrong. Performance wise I'd say just get a chipped p28. You're OBD-1 so you won't need a conversion harness or anything so the ECU swap would be cheap. Plus you could tune off of a ECU with already re-programmed fuel maps and vtec settings..... could help or hurt. I wouldn't know- I'm too poor for a VAFC.

 

for a great reply, Darrin!

Spaceboy, give me a call, I'll get you set of nice .25 over CTR pistons, all in OEM honda boxes.

I think with your gsr head that would put you a little over 12:1?

Adam

 

hey, thanks for all the comments guys! i learned most of it from h-t anyway for chipping, ih8ricerz(i think thats his name) sold me a great chip for a p28.$20 for a chip isn't much at all. i had the skunk2 program but ran a little funky.i still have the gsr manifold installed.but swapping in the p28 helped a lot..even though the butterflies stay open all the time(lose on bottom end though)i cut .4 off my 1/4 times.here in the mountains of TN, i ran 16.3 with the p72, and a 15.9 with the p28, then tossed the 2 10"'s out the trunk, and got a 15.7@92.2..my 1/4 times seem high compared to other gsr's on H-T, but there decently low here..just elevation i guess..

 

if you use CTR pistons..it'd be 12:1, but use that type r head..and it will drop to 11.7:1..isn't 12:1 pretty high for pump gas?

 

Yeah its a bit high, but with good tuning it can be done. Stick with a lower compression. Unless you plan on going all out in the future