Turbo?
2nd Gear Member
Joined: Mar 2007
Posts: 152
From: Texas
Superchargers are outdated tech. That comment might make some people go into defense mode, but sorry it's the simple truth there more parasitic than a comparable turbo setup. But then some people still decide to use a carburetor setup on a new built engine even though money's not an issue. So whatever, to each there own.
1st Gear Member
Joined: Mar 2009
Posts: 84
From: California
At 55 seconds to 1:04 of the vid..... THATS why some people still love super chargers!
Thread Starter
1st Gear Member
Joined: Sep 2007
Posts: 97
From: Stationed in Germany
I knew there would be someone, but um friend, mind telling me why a turbo car can't do that? Because um, they can. In fact better imo since you can launch with boost already built up. I.E. Anti-lag + stutter box = how much boost do you want to leave with? 10,20,30 **** 40psi? DSM guys launch with boost already built up all the time. And so long as the ECU's in these things are capable of being reflashed. I really see no reason why it's not possible on them either.
Last edited by Ripper Alpha; Aug 7, 2010 at 03:31 AM.
1st Gear Member
Joined: Mar 2009
Posts: 84
From: California
@ Ripper:
Lol dude easy! I know a turbo can do that! I should have clarified, but I was wanting people to hear that sweet SWEET scream of supercharger whine and the gunshot out the exhaust after every shift! Everytime I watch that vid I get goosebumps... Almost like its just a primal visceral scream going down that track!
Pretty much its pick a color/choose a flavor for forced induction. They all have advantages and disadvantages. But while I love both, Ill personally take a Whipplecharger on my Stang! Now on an STI, Evo or GTR... make mine a Turbo please!
Lol dude easy! I know a turbo can do that! I should have clarified, but I was wanting people to hear that sweet SWEET scream of supercharger whine and the gunshot out the exhaust after every shift!
Everytime I watch that vid I get goosebumps... Almost like its just a primal visceral scream going down that track! Pretty much its pick a color/choose a flavor for forced induction. They all have advantages and disadvantages. But while I love both, Ill personally take a Whipplecharger on my Stang! Now on an STI, Evo or GTR... make mine a Turbo please!
1st Gear Member
Joined: Mar 2009
Posts: 84
From: California
5th Gear Member
Joined: Jul 2010
Posts: 4,404
From: Texas
...you make hp by the amount of air and gas and the amount it is compressed. Leaving the valve open makes less compression but also makes less hp. So you are just dumping raw gas out the exhaust and that is not the point of putting on a turbo. Not only that if you're after hp you would probably disable the VCT like many people already do on the 3 valve cars.
Also, VCT does not change valve opening duration at all. It will chaneg your valve overlap so that you get little to alot of valve overlap depending on what RPM you are at. But it will never make the exhaust valve stay open longer.
By manipulating the valve overlap, however, you can reduce your trapped compression ratio, and this will be useful at lower RPMs.
At higher RPMs, you start to face the problem of dynamic compression ratio overtaking the overlap VCT can give you, thus you could have too high of a CR.
But as you already said, by allowing raw fuel and air to blow out the exhaust does nothing but waste fuel and worse, you do get less power gains than you should be getting. You might as well spend your money on other upgrades.
5th Gear Member
Joined: Jul 2010
Posts: 4,404
From: Texas
Well from my understanding of MIVEC on Mitsu engines like the last version of the 4g63T or the 4B11T. (Uses oil pressure variance between two chambers on the cam gears to advance or retard the valve timing.) I am assuming the Ford V8 does it the same way since I am also assuming like all V8's it uses timing chains, and in it's DOHC valve train layout I don't see any other good way to do it.
So , as the cam rotates, you have spring pressure from one set of valves trying to fight back and put negative torque on the camshaft but at different times, you also have the other set of valve springs pushing the cam forward and thus putting positive torsion on the camshaft.
What Ford's VCT does is it only locks and unlocks the cam phasers at the right moment to exploit these positive and negative torsions. To advance, it unlocks when there is positive cam torsion and locks again before negative torsion kicks in. To retard, it unlocks only when there is negative torsion and then locks again before positive torsion kicks in. And it does this very very fast, in tenths of a second.
5th Gear Member
Joined: Jul 2010
Posts: 4,404
From: Texas
I knew there would be someone, but um friend, mind telling me why a turbo car can't do that? Because um, they can. In fact better imo since you can launch with boost already built up. I.E. Anti-lag + stutter box = how much boost do you want to leave with? 10,20,30 **** 40psi? DSM guys launch with boost already built up all the time. And so long as the ECU's in these things are capable of being reflashed. I really see no reason why it's not possible on them either.
What most people do not realize is instead of going with one gigantic turbo, you can instead go with two smaller turbos to pump the same amount of air and significantly reduce turbo lag.
Another is to put two turbos in series (sequential I think it's called) where you have a small turbo for that launch off the line, and you have the larger turbo down stream for power while continuing to accelerate down the track.
And also, I am sue that turbine and compressor wheels are becoming much lighter as newer techniques of casting lighter materials (alloys) are found so a given wheel of a given diameter today will actually spool up faster than a heavier wheel of the same diameter using yesterday's materials.