lS throttle body

[krasyvy]

I have a d15b vtec engine which i believe to be a 55mm TB and I was thinking of replacing this with an LS TB which is bigger, i can remember by how much...

there are mixed opinions regarding this on d-series.org

i was wondering what ppl's opinions here are

would there be any gains? without port matching it?

[bennjamin]

Remember its the flush side to the inlet-manifold, which is the "measurement" - if the throttle body suface is actually larger than the inlet of the inlet mani then that will restrict flow in -

[krasyvy]

yeh, a lot of ppl in the states are bolting on LS TB's

just wanted to know if it was worth it

[DynoDave]

yeh, a lot of ppl in the states are bolting on LS TB's

just wanted to know if it was worth it
If you just bolt on a larger T/B and do not tune it to your engine you will only gain a very small amout of its true potential,and this is why people normally say that it does not give much of a gain.
Regards Dyno Dave

[krasyvy]

ok so there will be small gains...

and i wont experience larger gains until a tune

i guess thats fine with me

as long as i dont go backwards with a bigger TB