Wolf_Tm wrote:
Ok, so then please understand that there is people with much more hp than you that have full boost already at 3000 rpm, and not a peaky powerband that starts raising at 5000 rpm, and (looking at your video) at 8000 rpm (not 9000 as you said) is already gone.
If you don't believe me, you'll just have to look at Evo's and Subaru's forums all over the world and see what spool up/powerband they have in 6xx hp setups.
yes, i don't believe in full boost @3000 on 2ltr engine which output is 600+ hp. At 3000rpm flow is lower that 10lbs/min, what kind of turbocharger can support 600+hp and spools up only having <10lbs/min of flow in exhaust??? I beleive it can be on 2JZ, but not on 3S.
May be turbos with vatn or smthg like this, varible valve timing and phase shifting systems can rise up flow at low rpm's, but we talking about 3sgte gen3.
regarding video (as i understand what you talking about) - shifting usually a bit later that max hp revs point.
Quote:
So, IMHO, there is something somewhere that is wrong:
if I were you, I would try to change "theories/project" behind the engine building or "professional guys", before trying to build a twin-turbo setup.
Changing things - looking at results - have understanding what gives advantages. If always i will change everything - i will never know where was a mistake. It's same with cam timing setting up - first position "as you think" and then move and look at air log
Quote:
But that's me... and I too love to try new projects and make exotic experiments.
I forgot to say that I saw some GT28R on 2L (WELL PROJECTED), have full boost at 2600 rpm.
thats perfect, somebody targeting on good response, somebody to racetrack or quatermile
Quote:
"only" 550 hp already puts you in an elite group of gt4 owners. Most have taken much time to get to that level
You say this is on an engine which is not even fully set up. I think time spent dialing the engine parameters in will reap more benefit than coming up with complex systems - even though i really like the twin charge(turbo or super).
Cam timing will make a big difference and mapping of an engine to make good low and high power takes a lot more than a couple of dyno pulls!
we will see, try ti find optimal cam timing. Anyway i don't beleive in low response and good spool up with KKK29, it may be too big, it is even bigger that GT35R.
Quote:
Going slightly Off Topic,
I must say that I think that it's not THAT HARD to build an high hp engine...
big turbo, lots of fuel, and that's it.
What is REALLY hard and expensive is to build an high hp engine that is not used for drag racing or dyno session, but that it'll have to run in track session!
It's almost 5x expensive!
We all know that there is people with more than 6xx hp that run "10 seconds races" with stock block/rods/crank:
try to use the same setup in track, and it'll last 20 minutes!
And what it's even harder, because it doesn't depends on money but in knowledge, is to build an engine with a very large area under the power curve, that is to say wide powerband.
may be you know this article...good job, but different targets of mine
(link works only in IE, may be because i made this document in MS Word
http://team-rs.ru/members-dir/sklopendra@interform.ru/tomei_ej25.mht
Login
Register
FAQ
Search
