hi

i was wonderinf how smart it would be to run stock ITR/CTR cams in a GSR with stock drivetrain components springs,retainers ect.

i wanted to get cams but dont really have a lot of money to replace the valvetrain if needs be.

also what other cams would you guys reccomend? i was looking for something mild. Maybe Toda A's?

thanks

 

you'll be fine as long as you dont raise the redline to something crazy.

 

Eventually, you should replace the valvetrain...
there's a guy in classifieds selling a brand new itr valvetrain (inner, outer springs, retainers) for 300 shipped..


[Modified by Toda Party, 5:05 PM 3/16/2002]

 

The Killer B article stated that USDM Intake Valve Springs on all USDM Vtec motors are Dual and Stiffer than ITR Springs. The reason is because ITRs have lighter valves, so ITR intake valve springs would be a downgrade. He said simply upgrade the exhaust side with any good dual spring. Then you'll have the cash for Ti or Al retainers if you opt.

 

can you give us the link to that article? Looks like some good reading.. Thanks

 

i have entire skunk 2 valvetrain 4 sale brandnew e-mail with a price.. totaled my car against a dumptruck so i dont have a use 4 it..

 

this is so DUMB!!!!! your trippen and the article is trippen. the itr exhaust vavle springs are the same part number as the gsr intake vavlesprings, so they are not the same. it wouldn't be a downgrade!!!! here is what i would do buy the ctr/itr cams, buy the itr outer springs, and buy portflow inner springs and retainers..


[Modified by XtraFastCRX, 12:03 PM 3/17/2002]

 

Huh????? And that's even after you edited your post.


GSR intake springs = stiffer than ITR intake springs b/c ITR valves are lighter.

GSR intake springs = ITR exhaust springs


The article mentioned that for maximum safety, use only the ITR or CTR intake cam and give up 1-2 whp.


[Modified by bps2799, 9:10 PM 3/18/2002]

 

I don't understand. How can GSR Springs be stiffer than ITR springs yet be the same thing at the same time? Can you please show us the article for this? BTW, only getting the intake cam is sacrificing more than just 1-2 horsepower. The cams are made to work in conjunction with each other. The power across the powerband is much better with both cams.

 

This may be specious (don't believe everything you read), but the part #s confirm that GSR intake is the same as ITR exhaust. Logic would dictate that one would expect the stiffer springs to be used on intake side, but one could assume that since the amount of lift on ITR exhaust side is less, that these springs will work okay there when factoring in the total amount of compression, weight of lighter valves, lift, etc.

Anyhow, the buzz around here has been that you can get 7whp increase w/ an ITR cam and gain an additional 3whp w/ the matching exhaust cam. This roughly corresponds to what I read. I still imagine that the intake cam lift and duration (and overlap w/ exhaust cam) is the most important and determining part of the power equation.

I didn't buy the mag, so I can't get you the article, but try the most recent HondaTuner or whatever the hell it's called. Look up a few posts to see what the other guy who posted from this rag said it was.

 

http://www.hondatuningmagazine.com/a...2_tech02.shtml

There you go. Its all in there. Those springs are not the same between gsr and itr. The itr have inner springs as well on the exhaust side which is needed for the higher redline. Thats one of the best articles ive ever seen in an import mag. And no nudies distracting me for a change.

 

Not the same when placed in the same position, but interchangeable from GSR intake side to ITR exhaust side. Check your Helms service manual to see what I mean.


Simply put,

GSR Intake springs = ITR Exhaust springs

This includes the inner and outer springs.

 

Back to the original question.... If I were you.... I would wait and upgrade the valvetrain with installing the cams.

The Intake side for the ITR are different than the GSR for a reason. The Exhaust side may use the Intake side from the GSR simply because that is the next step down needed for the Exhaust Cam. Honda used those specific springs for a reason, and I tend to stick with their engineering,

 

 

1- don't believe everything you read
2- logic does not always work
3- in and ex cams work together so if you are ungrading the cams do yourself a favor and get BOTh cams. GSR's with just the in cam never make more than 168ish whp. The ones with both cams always make more than 170 whp. Mine made 176 whp with both cams. Never did a back to back run with just the in cam and one with both cams, but I do believe both cams give more than just 1-2 whp. IMO.
4- I revved my GSR to 8100+ rpm's 3-4 times every day for 6 months straight using ITR cams and stock GSR valve springs with no problems.