Compound Charging with Two Turbos: Benefits & Possibilities

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SUMMARY

The discussion centers on the concept of compound charging using two turbos, specifically for a 2.7-liter inline 6 engine currently utilizing a single turbo setup with methanol injection. The user seeks to improve the power curve at lower boost levels, aiming for 20psi, while currently limited to 15psi due to the ignition system. They reference past experiences with a GT35 Turbonetics turbo, noting issues with lag and drivability. The user is exploring the potential benefits of combining a smaller turbo with a larger one to achieve both top-end power and responsive low-end torque.

PREREQUISITES
  • Understanding of turbocharger mechanics and performance characteristics
  • Familiarity with methanol injection systems
  • Knowledge of ignition systems, particularly wasted spark setups
  • Experience with tuning and optimizing turbocharged engines
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  • Research compound turbocharging techniques and configurations
  • Explore the principles of turbo lag reduction and response optimization
  • Study advanced ignition system designs for turbo applications
  • Read "Maximum Boost" by Corky Bell for in-depth insights on turbocharging
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thetacoman
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Hi, I am currently seeking advice and looking into the idea of compound charging with two turbos. One blowing into another.
Here is a basic article on the subject.
Link
I am currently running a single turbo setup with methanol injection on a 2.7 liter inline 6. I know the benefits of having a smaller turbo and a large turbo would be having the efficiency of both without one running out of steam so to speak.
Now is this a plausible way to have a better power curve at lower boost such as 20psi? I am at 15psi currently, my ignition system is limiting this, but with new turbos will come a wasted spark setup.
Having some experience with this engine, it made quite a bit of peak power with a gt35 turbonetics on a different car(same motor but 2.5l). However it had a lot of lag and wasnt the greatest to drive around town. What I am chasing is the top end of a bigger turbo with the kick of a lower turbo.

Any thoughts on this at all? I am reading Corky Bell's Maximum boost again, I've been thinking aobut contacting him if its even possible to ask him questions.
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Turbos have come such a long way that there is almost no need for it except for usage on small cubic inch engines that make insane horsepower.

I'm talking about 1000+hp 2 liter Mitsubishi engines and such.