just checking i have a fully built ls i am about to put in my coupe my question is so far all the car i see at the track doing really good times has vtec can i do a 10sec pass or better without vtec

 

lol No but V-TACK is necessary

 

Technically yes...you can

Vtec killers have gone 10's NA in a crx --- still had a VTEC head though

Without VTEC you are really just cutting yourself short with a street car that could really benefit from the two cam profiles.

With boost its even more of a difference....hell they added I-VTEC to a boosted F20c and picked up 90+hp and 130+ft lbs of torque while spooling 700rpm sooner

If the technology is available....why not have a vtec head?

 

last time out we had issues with the vtec and we went 11.4 at 130 something and if we would of tried harder im sure our car would go 10s with no vtec but i would rather go for 9's with it.. its like going to a gun fight with a knife and leaving the sks at home it just dont make no sense...

 

vtec is a must i had a ls integra and that wuz ok. Untill i put together a ls-vtec and man its crazy my next step is boost

 

I think what you are trying to ask if if you can possibly run 10s or better using the LS non vtec head. Yes you could definately run 10s or better with a properly built LS block and head.
However using a VTEC cylinder head will not only net you more HP but TQ as well. IMO using the VTEC function on a race only application is not needed especially when the vehicle is not ever going to see lower RPMs.
For a street driven application I would definately keep the VTEC system intact.

 

sooner or later vtec will come but for now i have to find my breaking point between the b16 and the gsr is there a preference which goes to go better with the ls block

 

its all about flow. vtec no vtec if the head cant breathe then you arent going anywhere

 

/\that. The difference in flow is what makes the power.

 

Single cam, no vtec. Does that answer your question?

http://www.youtube.com/watch?v=R3EPuc9nI8A

 

thats some crazy sh!#

 

i agree. but dont most vtec heads flow better than non-vtec heads anyway? like previously mentioned, if superior technology is available, might as well use it.

 

im building a ls motor non vtec . vtec heads flow gd cuz their ported so what ima try is to port n polish the head 3 angle valve job, crower cams 404s and c what i get i think with a nice tune ill hit 13s. oh and the block p30 pistons stock bore

 

If you run a cam profile the same size as when vtec is engaged, you will see the same power on the same motor, in that particular rpm range. If it's a straight drag car, just having the high profile cam would be the same, but if it's gonna be used on the street in the lower rpm spectrum, then deffinately get vtec. The only reason to have vtec is to have your cake and better low end torque too.......

 

That was my point. I was just stating that the vtec isnt really what is giving you all the extra power.


The port size is not the only advantage of a vtec head. The angle,shape, and length of the ports also contribute to the gains. A ported LS head will normally still not make the power of a stock vtec head.

 

most of the fast guys are running a 2 lobe cam, no vtec, but street cars benefit from the low/high profiles for better driveability.

 

My 2450lbs car went 11.0 @ 126 on 93 octane with a built 2.0 NONVTEC at only 15psi. I ran Crower 404's with 8.4:1 compreesion. It also went 11.5's on a 225bfg.


I beleave with the boost turned up and race gas 10.3-10.5 would of been a problem.

 

this is off the topic but what piston c/r should i go with i want any were from 550-600hp ill be boosting my Ls-VTEC

 

this question is better posted in the forced induction forum...

 

now to answer the OP's question VTEC itself i dont think is necessary as stated above, I run VTEC killer cams in my B16 head and it is NO fun to drive on the street. If I needed to drive my car on the street more often I would have kept the VTEC in it.