raprazant

people its not that hard to understand. equal length = longer runners which will have a slightly slower spool time. is it that much of a differnce. not really. is it worth all the money. definately not. id take a log mani and save all that other money for other turbo goodies.

izzie

wth are you talking about - i said that longer runners create more lag... for the love of god... stop smoking that ----... its gonna kill ya

z6efboosted

i like his answer

Speedracer32

Well the FR test a saw between the log and equal was a big difference
I think it all about budget.
I say crawl before walk.

hotrex

well the log mani will allow you to max out the output of your stock block

thats all u want anyways but for a budget d series build no
maybe when your running 25 psi yes.

gon3r

i haven't seen a ram horn style manifold yet that is a "true equal length" manifold. sure the 1 and 4 runners are the same length and the 2 and 3 runners are the same length, but all 4 are not the same length in all the ramhorns i've seen. the 2 and 3 runners always tend to be a bit longer. the advantage of a ramhorn over something like a log manifold is the way the collector merges all the runners together into a funnel directing the exhaust into the turbo. but having all 4 runners the same length i would think would be most optimal. i am trying to design a manifold that will have all 4 runners the same length but it isn't easy. first i'm going to build a short runner manifold based on the design of the manifold that is on the top fuel civic.

izzie

could always just run twin turbos and have two seperate manifolds - one for two cylinders lol - could get equal length easilly

MAJORAHOLE

or run twin seqential turbos, one to spool the other. i dunno if that would be any faster though

izzie

kind of off topic - this was about equal length runners lol

Fulcrum

Equal length is marginally more efficient because of it equalizing backpressure between each cylinder. Tubular manifolds in general will flow better. This creates less reversion and allows your turbo to maintain boost at high rpm's where boost might start dropping off with a log mani. The downside is that the larger(I'm generalizing about the tons off different configurations) physical volume and surface area of a tubular mani will cause more lag.

Manifolds are (like anything else) a compromise between cost/effort and performance. Is it worth the extra time/money to build/buy that fancy tubular manifold?

IMO build a tubular with a 4-1 collector that keeps the runners as short as possible.

If you had a twin-entry CT26 you could pair cylinders 1-3 and 2-4 so they fired into seperate inlets.

The ultimate setup for high boost would be JR supercharger and a large turbo. The extra exhaust volume from the supercharger would help spool the turbo very quickly. You would need a serious motor to take advantage of this though.