JDMGSR and ITR CAMs

[jdmcivicgsr]

I got a b18 JDM GSR with basic bolt-ons i heard by putting just an intake ITR cams you would gain a cheap 6-8hp...if i did this would i need to do any other mods or upgrade any internal things. thanks for the input in advance

[stealth512]

common knowledge question, answer:
-if you keep the same redline you can get away with just dropping the intake cam in

i've done it before.

[CamryCivicMan68]

I've heard and read that you have to upgrade the cam gears if you put in performance camshafts.

[MQTGSR]

It's more or less the retainers and springs that need to be replaced, because these could frag with a higher redline.

[lude_pwr]

i thought about dropping in a ctr intake cam. but then i got to thinking, if i got a ctr intake cam, why not the exhaust cam? you might as well, it'll only run that much better. also even with a bigger cam profile, i wouldn't push the motor harder than what the stock valvetrain is rated at. another note, you can use whatever cam with any cam gear designed for the b-series.

[MQTGSR]

Eh, I wouldn't do that. If your gonna do cams, do em right and get the whole valve train beefed up. And get both cams at once, otherwise your not really doing yourself a whole lot of gain.

Speaking of witch, are the CTR cams the best OEM cam you can get? or are ITR cams better?

[lude_pwr]

you know, mtq. i'm not really sure which cam has a more aggressive profile. i was always under the impression that oem valvetrains can handle oem cams. am i right or wrong? i remember when i overhauld my gsr head, the intake springs were doubled up. if itr's have dual intake springs, and so does a gsr, then why can't a gsr handle itr cams at the same rev limit?

but your right, if i had the cash at the time i woulda built the valvetrain for a sicknasty pair of cams and 10k+rpm, but i'm poor so i think i did well

[MQTGSR]

To my understanding, OEM valvetrains can't handle the type R cams because the type R cams rev the motor higher, where the GSR can't, this causes valvetrain damage. Hence why you would want to beef up your valve train for thoes cams.

[lude_pwr]

i understand where you're coming from about revving the motor.

but what i'm saying is, if i use my stock gsr valvetrain with stock itr cams, considering i wouldn't rev my motor any higher than i do now. would i be fine with itr cams?

[MQTGSR]

Originally Posted by lude_pwr

i understand where you're coming from about revving the motor.

but what i'm saying is, if i use my stock gsr valvetrain with stock itr cams, considering i wouldn't rev my motor any higher than i do now. would i be fine with itr cams?

Possibly, they may have a larger lift on the cams too, but I don't know, I am assuming they do, and why not take advantage of the cams higer revs? They make the power your paying for up there in the high rev range, just like all v-tecs.

[stealth512]

Oh my...I hope I can answer this confusion.
CTR cams are the biggest...but later model ITR's are virtually the same. (not that there's much difference between CTR's and ITR's anyways.)

The dual intake valve springs on the GSR head are not the same rates as the ITR's. The part number for GSR intake valve springs are the same as the exhaust valve springs for the ITR. ITR's have different intake valves that are suppose to be lighter.

Type R cams have more lift and duration that all other OEM cams...couple that with the raised redline and thus why they have different valve springs.

If you install just the intake cam...it's cheap and it works and you can get a little bit more power...I've ran this for quite a long period and had no issues. But of course you can also do a whole bunch of other stuff and get even more power and reliability.

You don't have to install adjustable cams gears for type r cams...but you can get more power if you have and have them tuned. but in my opinion it doesn't make sense to install only the intake cam and have adjustable cam gears.

If you buy both intake and exhaust cams..then it would make sense to upgrade the valvesprings/retainers. Otherwise you shouldn't rev over the stock GSR redline which you will want to.... and even still you will be worried that it's gonna break any day now.

[MQTGSR]

Originally Posted by stealth512

Oh my...I hope I can answer this confusion.
CTR cams are the biggest...but later model ITR's are virtually the same. (not that there's much difference between CTR's and ITR's anyways.)

The dual intake valve springs on the GSR head are not the same rates as the ITR's. The part number for GSR intake valve springs are the same as the exhaust valve springs for the ITR. ITR's have different intake valves that are suppose to be lighter.

Type R cams have more lift and duration that all other OEM cams...couple that with the raised redline and thus why they have different valve springs.

If you install just the intake cam...it's cheap and it works and you can get a little bit more power...I've ran this for quite a long period and had no issues. But of course you can also do a whole bunch of other stuff and get even more power and reliability.

You don't have to install adjustable cams gears for type r cams...but you can get more power if you have and have them tuned. but in my opinion it doesn't make sense to install only the intake cam and have adjustable cam gears.

If you buy both intake and exhaust cams..then it would make sense to upgrade the valvesprings/retainers. Otherwise you shouldn't rev over the stock GSR redline which you will want to.... and even still you will be worried that it's gonna break any day now.

Well thanks for the clarification, I pretty much assumed that anyways. That the cams were more aggressive, had a bigger lift and so on, and that is why u would want to re-enforce your valve train instead of just dropping the cams in there. One of these days if I have money, some CTR or ITR cams would be nice.

[jdmcivicgsr]

thannks for the input stealth512 im really considering putting a ctr or itr intake cam just for some cheap HP...is it really worth it and does it make a good difference..im just a broke dude trying to get a little HP

[2highpsi]

the ctr intake cam is slightly bigger than the itr intake cam.
and you don't have to upgrade your vavletrain with either of those cams as long as you don't rev over 8

[9400rpms]

Half you people need to do research before responding to something you "think" you know..

its a OEM cam, why would you need to upgradea oem valvetrain??
The 98 type-r revs to 8455, while the jdm gsr revs to 8233.. not much of a difference there.
All b series head come with dual intake valvesprings, and single spring exhaust springs.
MOST people dont upgrade valvetrain..
95~97 CTR cams are bigger then 95~97 itrs
98~01 CTR/ITR cams are the same
The only difference anyway is the vtec lopes, the primaries are the same.


For you people who can google cam specs.
GSR's b17/18 ALL JDM/USDM GSR Run these cams.

INTAKE lift - 10.6 mm,duration - 230 @1mm
EXHAUST lift - 9.4mm, duration - 227@1mm

95~Early 98 itr
INTAKE lift - 11.5 mm, duration 240 @1mm
EXHAUST lift - 10.5mm, duration 235 @1mm

98+ itr/ctr
INTAKE lift - 11.5 mm, duration 243 @1mm
EXHAUST lift - 10.5mm, duration 235 @1mm

to be honest? There's no difference at all, you wont feel it, and to be 99% positive if u want to upgrade get a bigger cam..
Stage1 cams are only slighty more aggressive then these cams.. take the 98 + these the vtec lobes only btw, and u can see the intake cam is 243, a stage1 cam will only be around 258~260, that isn't really alot.
not for the money at least. IF your going all motor do it the right way and research what u wanna do, What makes power on a stock block, and what doesn't,
oem cams are nice.. for very very basic, very very mild builds.. anything else they're a waste of mo