Low comp. + turbo + good tuning and High comp. + turbo + good tuning
Which combination will produce max. power?
Printable View
Low comp. + turbo + good tuning and High comp. + turbo + good tuning
Which combination will produce max. power?
Too lower comp gives poor off boost response, too high comp will break your engine, there's a compromise to be found.
high comp + turbo = more power than low comp + turbo if all other things remain constant
High compression = 11+
Low compression = around 9-10
Which compression setting will be suitable for turbo set up?
both are potentially suitable for a turbo set up(with in reason)... There's absolutely no reason you couldn't run a 11-12:1 comp ratio with a turbo set up, as long as you have an appropriate set up... correct pistons(most high comp pistons are made of a different material than low comp turbo pistons... so you have to be careful there), proper fueling/octane rating, good intercooling, and most importantly very very good tuning.
also, keep in mind, most people think of low comp as 9 or lower generally...
stop reading stuff written by net mechanicsQuote:
Originally Posted by T-onedc2
with high comp motors and turbo tuning is vital. Its all in the tuning. Just take a look at AH_HUH car...type R boosted with stock internals it made 200kw atw +, thats got 11.5 compression.
Talk to your tuner and see whether they can tune it, if they can't find a new tuner!.
as far as i'm aware a lot of those in the states that run b18c's use b16a heads cause apparently they flow better and give lower compression. the lower compression basically allows you to run more boost. i'm not very turbonetically educated but i have read a bit and it seems many people go for the b16a head for higher boost applications.
but like i said, i've never actually done it so try and research off those that have, maybe check some yank sites out too :)
running a lower comp ratio does allow you to safely run higher boost, however, you're getting less hp per psi, less ftlbs per psi, poorer response on and off turbo, less low down torque, etc
people have to run higher psi levels to catch back up with the higher comp set ups at a lower psi
Last question:
High compression + low boost + good tuning
Low compression + high boost + good tuning
Which combination will produce more power?
^Considering all factors are constant - as in good tune = good tune (same tuner), then they'd be equal to one another.
You're basically sacrificing one or the other to achieve the same goal.
assuming the same effective compression is achievedQuote:
Originally Posted by Q_ball
(i.e. a 10 psi boost on an 11:1 comp ratio versus a 15 psi boost on a 9:1 comp ratio) then yes, the final power may be the same, but the higher comp set up is still going to have the benefit of better off boost power, quicker spool, and better throttle response