Reducing turbo lag: What should my next step be?
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I like your plan to try C first. Don't worry about the ballbearing vs journal at this point. A properly sized turbo will go a longer way that just a different center section.
Your thoughts on the twin scroll not benefiting are somewhat correct. You need proper manifold design to completely benefit from a twin scroll. You isolate the engine pulses.
Stroking or changing the CR ratio will be very expensive and not help you in the way you think. Turbo sizing will still be important, probably more so. You can get there with tuning and turbo selection before digging into the bottom end.
The Hallman controller is fine. Very solid and simple. The only thing better would be if your engine management controlled it.
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That is sound advice,
All I have at the moment is a shot of the pressure vs RPM in 2nd gear
How abt a jpg with a mark where it reaches 11psi so we know when that is. Add AFR too.
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Smaller turbine housing == quicker spool == more flow restriction on the top end. The .63 hot side is not all that big, I'm guessing you've got a 4 banger?
My suggestion is to spend a bunch of time driving the car, learn to drive around lag. I had a T66 on my 95 Supra, a 20g on some of my DSMs, a GT3076r on my Legacy GT. You learn the car, where to keep RPMs when you think you may need them, downshift more, etc. Learn the car. If that doesn't do it for you, a smaller turbo is a great idea, start with the hot side.
I'm also a big fan of Hallman MBCs, and used them on all of my cars since around 1993. Except my current E92.
The Hallman will produce full boost at partial throttle, so an EBC may very well address your "boost comes on too fast" comment. Your tuner should be able take care of that.Ball bearing turbos are great, don't worry a thing about them. They can stand the abuse just as a non-bb can.
Take a look at the compressor maps of the various turbos you're interested in, take the time to understand them and they'll provide good information for making a decision, as well as what the CFM flow rate of your head is, etc.
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Smaller turbine housing == quicker spool == more flow restriction on the top end. The .63 hot side is not all that big, I'm guessing you've got a 4 banger?
My suggestion is to spend a bunch of time driving the car, learn to drive around lag. I had a T66 on my 95 Supra, a 20g on some of my DSMs, a GT3076r on my Legacy GT. You learn the car, where to keep RPMs when you think you may need them, downshift more, etc. Learn the car. If that doesn't do it for you, a smaller turbo is a great idea, start with the hot side.
I'm also a big fan of Hallman MBCs, and used them on all of my cars since around 1993. Except my current E92.
The Hallman will produce full boost at partial throttle, so an EBC may very well address your "boost comes on too fast" comment. Your tuner should be able take care of that.Ball bearing turbos are great, don't worry a thing about them. They can stand the abuse just as a non-bb can.
Take a look at the compressor maps of the various turbos you're interested in, take the time to understand them and they'll provide good information for making a decision, as well as what the CFM flow rate of your head is, etc.
he has the m20b25 I6 in his car
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Smaller turbine housing == quicker spool == more flow restriction on the top end. The .63 hot side is not all that big, I'm guessing you've got a 4 banger?
My suggestion is to spend a bunch of time driving the car, learn to drive around lag. I had a T66 on my 95 Supra, a 20g on some of my DSMs, a GT3076r on my Legacy GT. You learn the car, where to keep RPMs when you think you may need them, downshift more, etc. Learn the car. If that doesn't do it for you, a smaller turbo is a great idea, start with the hot side.
I'm also a big fan of Hallman MBCs, and used them on all of my cars since around 1993. Except my current E92.
The Hallman will produce full boost at partial throttle, so an EBC may very well address your "boost comes on too fast" comment. Your tuner should be able take care of that.Ball bearing turbos are great, don't worry a thing about them. They can stand the abuse just as a non-bb can.
Take a look at the compressor maps of the various turbos you're interested in, take the time to understand them and they'll provide good information for making a decision, as well as what the CFM flow rate of your head is, etc.
Thanks for the input! I appreciate your experience.
I will talk with my tuner
EDIT: I just talked with my tuner, he thinks I have Multiple Personality Disorder.
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Smaller turbine housing == quicker spool == more flow restriction on the top end. The .63 hot side is not all that big, I'm guessing you've got a 4 banger?
My suggestion is to spend a bunch of time driving the car, learn to drive around lag. I had a T66 on my 95 Supra, a 20g on some of my DSMs, a GT3076r on my Legacy GT. You learn the car, where to keep RPMs when you think you may need them, downshift more, etc. Learn the car. If that doesn't do it for you, a smaller turbo is a great idea, start with the hot side.
I'm also a big fan of Hallman MBCs, and used them on all of my cars since around 1993. Except my current E92.
The Hallman will produce full boost at partial throttle, so an EBC may very well address your "boost comes on too fast" comment. Your tuner should be able take care of that.Ball bearing turbos are great, don't worry a thing about them. They can stand the abuse just as a non-bb can.
Take a look at the compressor maps of the various turbos you're interested in, take the time to understand them and they'll provide good information for making a decision, as well as what the CFM flow rate of your head is, etc.
Tuner? Who needs a tuner?
THIS IS MEGASQUUUUUUUUUUIRT!!!!!!!!!!!!!
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You should really use the cheap EBC they have for megasquirt.
Anyways
TWIN SCROLL MAKES AN AMAZING AMOUNT OF DIFFERENCE.
Not only on spool up(sometimes between 200-400rpms sooner)
But TRANSIENT response. Which is what matters to me.
I hope you're happy to know that your car spools faster than a stock bugeye wrx...
But anyways I should really get this twincharged project done because you would love the whole no lag thing.
In reality I was hoping to see full boost by 3k, which for me is nothing..
sk8 or die
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Anything specific he should datalog?
Everything. The more data available the better. Snap - which datalogging capabilities is TCD speaking of? How is your car setup today?
FWIW, when I log my car (jb4 equipped) I get all possible data available via the OBD2 port. That way I can display anything/everything I want when addressing a possible issue with the tune/car/setup/etc.
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E30 anti-lag coming soon to a quiet suburb near you.
I've watched this video 20+ times and I still giggle like a little school girl
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