DIY Inlet Bypass Anti-Lag? Discuss...
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Anybody around here attempted this? Instead of conventional bang-bang style antilag that retards timing and lets additional air into the intake manifold when you are off the throttle, this method uses a valve to bypass air from the turbo compressor right into the exhaust pre-turbine. Then additional fuel is introduced from the engine running rich or from some kind of injector in the exhaust. The exhaust acts as a combustor and spools the turbo like a jet engine. Its much less destructive than bang-bang style antilag. Prodrive has a version of this system aptly named the 'Rocket', which will allow the car to launch at 1800-2200 RPM with 47 PSI!!!! Amazing!
Here is a video of bang-bang: Here is a video of the inlet bypass system (WATCH THE SUBARUS LAUNCH - the other cars do not use it to the same extent): I want to get something going on discussing/constructing a functional system like this for a road car, DIY style. For the valve, a proper large-bore PWM valve would be preferred for adjustable flow, however this is almost definitely out of our budgets. Large 2" bore electrical solenoid valves can be had on ebay for less than $50. They may not be able to be PWM controlled, but an OFF-ON valve can work just fine most likely. As for the piping, your average HMT DIY style hack and slash piping weld job can suffice. The only real variables here are introducing the additional fuel, controlling it all, and making sure the reaction is taking place before the turbine, and not after it. Lets address them:
Like I said, discuss if you are interested. Here is an image of the prodrive system utilizing this concept: https://www.homemadeturbo.com/attach...ine=1318565299 There was a source (do not know how reliable) telling me that this system actually used a flame tube pre-turbine to contain the combustion. Here is the thread of the Buick guy running a giant turbo and using pre-turbine nitrous injection (basically liquid air) to spool it: http://www.theturboforums.com/smf/in...topic=135414.0 |
Dude ! still here ? we have tons to talk about this :P
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I've bult myself one of these bad boys...i mean 4
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Hey! Holy cow! Totally forgot about this site, here I am 7 years later, looking into a non-destructive antilag system for my Evo 8.. Started reading this thread, had to double take when I realized I had wrote it!! 😄 What a trip! Yeah so I haven't really looked much into the system after this post, other than discovering the prodrive system was called "hyperbar". I had visions of grandeur, wanting to put this in a street car and having no money. Well here I am with a better budget and a better car, and an actual purpose other than cool factor (road racing). I would love to hear about what you've done to replicate this setup. Let me know! Cheers! 🍻
Originally Posted by vlad_rally
(Post 1311559)
I've bult myself one of these bad boys...i mean 4
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