i have been riding around in my freinds rsx-s lately a few times and im about to put a UK gs-r engine in my car.. well riding in his car made me love the feel of vtec, i was wondering if the gs-r's pull is similar or will i feel it like the rsx-s?? im just wondering what to expect after i get it in..

 

To be totally honest with you, the GS-R Vtec is more aggressive than the RSX-S iVtec because the iVtec's power is very linear and smooth. It'll just ride up and keep pullin while the GS-R vtec just pops and you can really HEAR and fell the vtec especially when the secondaries open up...

 

ok cool

 

You'll have a similar feeling, but it's probably not going to be as strong and the i-vtec in the RSX-S. The difference is due to regular vtec and i-vtec. Here is how i-vtec works:

-VTEC™ Technology

Acura's Variable Valve Timing and Lift Electronic Control (VTEC™) has set unmatched standards for extracting ample low-rpm torque and high-rpm power from the same engine. But a new technology that makes its debut in the RSX and RSX Type S takes VTEC a step further. It's called i-VTEC (the "i" stands for intelligent), and it helps both engines respond quickly while it improves fuel economy and reduces exhaust emissions.

In addition to controlling valve lift, timing and duration the way other VTEC systems do, i-VTEC uses Variable Timing Control (VTC). By regulating oil pressure, VTC adjusts the phase of the intake camshaft, advancing or retarding intake cam timing (relative to exhaust timing) in order to keep power output smooth across the rpm spectrum on both RSX engines.

In the 160-hp RSX, the VTEC modulation of i-VTEC works on the intake valves exclusively, using a 2-rocker arm design. At lower rpm, the second intake valve opens only partially, creating a desirable swirl effect in the combustion chamber. At higher rpm, both intake valves open fully, for quicker, easier breathing and full power output. In the 200-hp RSX Type S, an exclusive 3-rocker-arm design operates on both the intake and exhaust valves, developing incredible low-end torque and high-end power. At lower rpm all valves open to a lower profile that changes to a higher profile, with a longer duration, at higher rpm. In both engines, i-VTEC is designed to get not only the best results at a given rpm level, but the best performance possible from each individual engine revolution.

Now in a UK GSR you'll have three stages of vtec:

First @ 4400rpm
Second@5600rpm
Thrid@around 6500 to 7000rpm

Then again I'm not sure if the i-vtec has the feature of three stage vtec as does the GSR, maybe if i-vtec is single stage it may be not be as strong as the GSR engine.


[Modified by RAB_01_GSR, 3:13 AM 5/20/2002]

 

there is only one vtec...4400.
5600 is the secondaries...
and there is no third.....what are you talking about....

 

go go vtec

 

3 stages of vtec what do you mean do explain...

 

and what are secondaries?

 

there is no 3 stage or 2 stage vtec...as one said earlier, vtec stock is 4400 or 4450...secondaries is 5750...and that's it. vtec only comes in once bro.

 

there are three diferent cam lobe sizes. read your haynes verry closely

 

yall lost me.

 

jdmcrhis, what they are talking about is 1. vtec that has to do with different lobe sizes on the cam, one for low end and then one for top end, when the cam shifts to top end that is what people call "in Vtec" these lobes control the timing of the valves. 2. secondaries, which are a set of butterflies in the intake manifold that open up to allow longer runners to suck air for the higher rpm's.

 

Yeah, I've never heard of this "3rd" lobe....hehe...

 

The GSR's powerband is very linear, you won't feel vtec. With an intake and exhaust you can "hear" vtec. Get some ITR cams if you want to feel vtec.

 

well i dont know about the rsx but on the gsr their are 3 lobes... The outter lobes are the same and the inner lob is the vtec lob.

Vtec = 4400
secondarys = 5800

only 1 vtec.... secondarys are on the plentium and help add tq at lower rpms...

 

Ok I feel like I @#$%ing idiot I knew the the tech aspects of vtec and how vtec works and all , but can you explain the tech aspects of the "secondaries", like what are butterflies. Go easy on the flames.

 

I hear vtec all the time engaging and disengaging, what I love best about hearing vtec is the clicking at of course 4400 rpms. My engine only has 6000 miles on hit so that's probably why I hear vtec so fiine.

 

the intake manifold has to sets of tubes (runners) that suck in the air, one is short, for lower rmp power and one set is longer for top end power, the butterflies that keep the secondaries (longer lobes) start out closed and then open up at 5750 for more top end power. this is the best i can try and expain it

 

A stock gsr vtec pull to me is very weak if anything it just feels like the car continues to make power instead of fallin off like an LS

 

hmm... Idk, but my Vtec seems to REALLY pull... Much more agressive than a Type-S

 

mine too, my wheels break loose when it engages.

 

Is that before or after you had the cams installed... maybe I am biased (jun 3's in my 99 gsr) when i drive my other stock gsr it feels weak


[Modified by alexboy, 12:41 AM 5/20/2002]

 

For anyone who wants to know exactly how VTEC works, go to this site.

http://www.leecao.com/honda/vtec/index.html

 

Your tires break loose w/ just ITR cams and bolt-ons? Unless you have some bald tires that is very hard to believe. For example, the S2000 I drove recently is obviously faster than the average GS-R and any stock ITR, yet the tires didn't break loose. VTEC is nothing big and I hope we don't get into another dumb/useless argument about it. Sure, you can hear it, but honestly...do you really feel a huge noticable thrust?

 

You can definately feel your body pushin back more than when you're out of VTEC. Of course it isn't like a SURGE of power, but you can definately feel the bigger lobes kick in...