building for boost, help?

[mike@synapse]

You should read your own sig, just cause everybody else is doing LS/Vtecs doesn't mean its the best thing to do. LS engines have made impressive numbers without the aid of vtec. Doesn't mean I agree with 253eg.

wow!

have you ever thought it might be the other way around? maybe its not the best thing to do because everyone it doing it, but rather everyone is doing it because its the best thing to do!

boosted ls engines can make good numbers, boosted vtec engines make better numbers.

the "ideal" b series engine would be an ls crank in a gsr block because it has the girdle, but ls vtec is an excellent platform to work with on a boosted setup.

Ls turbos are great motors, I dont want Vtec on my turbo setup. Just one more thing that would need tuned.

fear the vtec tuning. so because you dont know how to tune vtec, he shouldnt use it?

 

[99CivicSiBrian]

just boost teh LS, LS/vtec+boost i think would be unstable

Agreed. Hardcore racers use VTEC killer cams, and eliminate VTEC.

Also, you're going to increase your redline from 7k to 8k with VTEC head and the physics of the extra 1000 RPM is quite complex but something to keep in mind.
On the other side, you'd have to modify the non-vtec block for the extra oil lines and such and I would question how far you can squeeze the oil pressure with out issues. You already need to feed the turbo and the rest of the engine, but then you have to send more pressure to the head. . . I wonder.
In my opinoin a VTEC block and head should stay together for turbo, or a non-vtec block and head. I think vtec blocks are better because they have oil squirters for the pistons thus keeping them a little cooler.
Maybe

 

[ryan89crx]

You should read your own sig, just cause everybody else is doing LS/Vtecs doesn't mean its the best thing to do. LS engines have made impressive numbers without the aid of vtec. Doesn't mean I agree with 253eg.

my sig has nothing to do with choosing a head that flows poorly vs a vtec one just because you feel like going against the grain.

whats next? choosing an LS trans over a GSR because nobody else does it?

 

[Matt.]

you kiddin me? ls/vtec turbo unstable? I've seen a few run 12 second passed with 10 psi on a t3/t4 .50 intake side and ran pretty well.

 

[Billy.]

Agreed. Hardcore racers use VTEC killer cams, and eliminate VTEC.
Also, you're going to increase your redline from 7k to 8k with VTEC head and the physics of the extra 1000 RPM is quite complex but something to keep in mind.

the TODA vtec killers you refer to are actually high profile cams, its like running in VTEC constantly. the low cam lobes are replaced with high cam lobes. the reason behind it is for track racing so youre constantly making max hp even while dipping below the otherwise VTEC changeover rpm.. VTEC killers make daily driving horrible b/c there is no power in the lower rpm band. they are strictly for closed circuit racing.

the redline of a honda motor is typically never governed by the head, but by the block, controlled by the ecu. you wont see valve float til long after the block has thrown a rod, or spun a bearing. if youre too stupid to let your foot off the throttle before 8k rpms, you dont deserve the motor you just blew up.

my sig has nothing to do with choosing a head that flows poorly vs a vtec one just because you feel like going against the grain.

whats next? choosing an LS trans over a GSR because nobody else does it?

you kiddin me? ls/vtec turbo unstable? I've seen a few run 12 second passed with 10 psi on a t3/t4 .50 intake side and ran pretty well.

anyone that says LS > LS/VTEC, for boost or NA, is talking from an unexeperienced point of view and needs to get the facts instead of throwing theory up as law.

 

[bompdrop]

okay, so what would anyone say for a transmission? just an LS?

 

[mike@synapse]

anyone that says LS > LS/VTEC, for boost or NA, is talking from an unexeperienced point of view and needs to get the facts instead of throwing theory up as law.

notice all the people saying ls/vtec is garbage is running an non-vtec.

 

[mike@synapse]

Agreed. Hardcore racers use VTEC killer cams, and eliminate VTEC.

Also, you're going to increase your redline from 7k to 8k with VTEC head and the physics of the extra 1000 RPM is quite complex but something to keep in mind.
On the other side, you'd have to modify the non-vtec block for the extra oil lines and such and I would question how far you can squeeze the oil pressure with out issues. You already need to feed the turbo and the rest of the engine, but then you have to send more pressure to the head. . . I wonder.
In my opinoin a VTEC block and head should stay together for turbo, or a non-vtec block and head. I think vtec blocks are better because they have oil squirters for the pistons thus keeping them a little cooler.
Maybe

you must be stuck in the 90's or something. you dont have to modify the vtec block for any oil lines, you can use a sandwich plate and run the line to the head externally. also the oil pumps on both motors are the same, so its not like a vtec engine puts out more oil pressure. once you get forged pistons and rods you dont even use the squirters. the gsr/itr block is the best because is has a girdle.

its not just the cam profiles that make a head flow well or else cammed ls' would be flowing what a vtec head flows. vtec killer cams were made to lighten up the valvetrain on a vtec head. most drag cars never drop out of vtec anyway so the primary lobe isnt even a concern. but they still need the vtec heads ports to flow as much as possible.

 

[Billy.]

okay, so what would anyone say for a transmission? just an LS?

b16, or a gsr with 4.7 FD. LS is way too long IMO

 

[Ominous G2]

Im still trying to figure out when somebody said an LS was better for N/A then an LS/Vtec.