T3-T4B on D16Y8
09-13-2005, 11:56 AM
#21
0.0 BAR
Join Date: Feb 2003
Posts: 0
Re: T3-T4B on D16Y8
Originally Posted by djfob
I run a t3/t04b vtrim with a stage 1 .48 hotside. It's starts spooling at 3k and full boost by 5k, imo it's perfect.
You guys could also yank ~5 degrees timing right before spool, and maybe lean things out a touch in the same region. Should be good for noticeably quicker spool on the big turbines.
09-13-2005, 01:29 PM
#23
3.0 BAR
Join Date: Mar 2005
Posts: 3,161
Re: T3-T4B on D16Y8
Originally Posted by jagojon3
How would pulling timing make a turbo spool fast? I thought it was the other way around, more advanced timing will spool it faster
Yea, wouldn't you advance it right before then retard it? Basically reiterating what Jon said. :P
JP
09-13-2005, 02:35 PM
#24
0.0 BAR
Join Date: Feb 2003
Posts: 0
Re: T3-T4B on D16Y8
By retarding the ignition you fire the burn later. Instead of expending the most of combustion pressure across the piston face, the exhaust valve opens "earlier" in the combustion reaction, and you shift a larger portion of the burn out into the exhaust. Spending more of the thermodynamic load across the turbine. Spool city.
84mm B16, SC61, possible to spool a whole 2000 rpms sooner. Complaints of poor off-boost response because of it, but the guy doing the tuning is a real fucktard. I've not had a personal boost-pig with a huge turbine to play with, and I've not wanted to risk overheating the exhaust valves/hotspots/pre-det on a couple of customer's cars by playing mad witchdoctor on their tune w/ no basis of personal experience. Yeah, I yank a couple degrees then feed it back in when the boost comes up, but nothing major.
84mm B16, SC61, possible to spool a whole 2000 rpms sooner. Complaints of poor off-boost response because of it, but the guy doing the tuning is a real fucktard. I've not had a personal boost-pig with a huge turbine to play with, and I've not wanted to risk overheating the exhaust valves/hotspots/pre-det on a couple of customer's cars by playing mad witchdoctor on their tune w/ no basis of personal experience. Yeah, I yank a couple degrees then feed it back in when the boost comes up, but nothing major.
09-13-2005, 05:11 PM
#26
Guest
Posts: n/a
Re: T3-T4B on D16Y8
Originally Posted by samson
I think I get you. It loads the cylinder then the explosion is more powerful and forceful by retarding the firing thus allowing it to fill more, right?
JP
JP
Basically you are sending more of the energy out the exhaust port, instead of against the piston and to the wheels. In an N/A car this would just be lost energy, but this "lost" energy now spools the turbo up quicker.
Joe dude you rock, tell me some more ---- I don't know
Is this the same as FTL or MSD 2-step? Same basic priniciple?
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