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Thread: Turbo spool tuning

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Posts: 1-10 of 31
2012-05-22 12:35:29
#1
Turbo spool tuning
Hey everyone! I have read many threads and posts in numerous forums about something that I'm very interested in and I want to learn exactly what I am doing, so.. Its about tuning the spool up time on a turbo SR20. What I mean is what are the general directions for a (self)tuner to liven his turbo car during spool up time. Concerning afrs and timing. What is the logic of things tuning this part of engine regime. Driving nicely around and you want to go fast,you press the accel pedal and you move in a particular zone of the map.I am interested in this particular zone - from about 0.4 bar vacuum to 0.2,0.3 bar boost. So please share to help a "young" realtime ecu owner to make his turbo live better .
P.S I know that this info might be .. and is kind of "secret" and unique, but around here there is no such tuners as You guys have, so practically I have no choice but to be on my own with my car Thanks.. Damn, too long post again!
2012-05-22 13:34:49
#2
Keep waste gate shut.
2012-05-22 13:50:36
#3
Originally Posted by wnwright
Keep waste gate shut.


Lol and what if he doesn't have an EBC that's capable of doing that? My blitz DSBC has it and its friggin awesome it also has scramble boost and a shitload of other features that I have even begun to mess with yet.
2012-05-22 14:04:12
#4
No EBC is needed to keep the wastegate shut. You can use a simple check-valve manual boost controller to do the job.

I believe the OP is well aware of these things. He wants to know if running lean will help boost onset because of the extra heat (energy) of the exhaust, or if running rich will increase boost onset because of the increased mass-flow (energy) of the exhaust.

He wants to know if running advanced timing will increase boost onset because of the increased pressure (energy) of exhaust gas, or if running more retarded timing will help boost onset because of the increased heat (energy) of the exhaust.
Last edited by BenFenner on 2012-05-22 at 14-39-14.
2012-05-22 14:35:43
#5
Tuning is such a small factor compared to other things (assuming reasonable tune in that area)....
2012-05-22 14:45:55
#6
everything helps though! I'm also curious to hear from some experienced tuners
2012-05-22 15:12:46
#7
Originally Posted by BenFenner
No EBC is needed to keep the wastegate shut. You can use a simple check-valve manual boost controller to do the job.

I believe the OP is well aware of these things. He wants to know if running lean will help boost onset because of the extra heat (energy) of the exhaust, or if running rich will increase boost onset because of the increased mass-flow (energy) of the exhaust.

He wants to know if running advanced timing will increase boost onset because of the increased pressure (energy) of exhaust gas, or if running more retarded timing will help boost onset because of the increased heat (energy) of the exhaust.


I wanna know too Ben
2012-05-22 15:17:32
#8
Like wnwright said mechanically best thing to do is to have some kind of pressure check mechanism and not to allow wastegate to open until set pressure. This is a known option. I disagree that tuning is small factor. You are right that there wont be much of a difference if maps are already well managed to the current setup, that is why i talk in general. What i understand is there are two "poles". More advance timing with less fuel(leaner afr) and Less timing with more fuel. The second one is close to what antilag system is as method. Basically less advance of ignition timing gives the mixture not enough time to burn and the front moves into exhaust and the effect is increased turbine wheel speed. This method stress more exhaust manifold and turbine itself. The other one creates more heat inside combustion chamber and the heat is absorbed by the engine itself(cooling system), but this is prerequisite for other bad things as we know it
Last edited by Xedox on 2012-05-22 at 15-23-09.
2012-05-22 15:34:33
#9
Originally Posted by Xedox
I disagree that tuning is small factor.


Good for you. Cams, cam timing, etc etc etc... All have bigger impact from my experience, but what do I know?
2012-05-22 15:51:45
#10
I know most of you have more experience than me in this. Wnwright I don't question your knowledge. I just meant that there will be difference tuning mechanically same turbo engine. I only refer to fuel and timing control here. That is why i posted this in tuning section. Of course there is more to be done with things like cams,gears, housings, manifolds and etc. I'm talking mapping guide
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