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BRZ Second-Gen (2022+) -- General Topics General topics for the second-gen BRZ |
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11-20-2020, 01:17 PM | #1 |
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Will Forced Induction Potential be Limited for New Engine?
Hey guys,
Looks like the compression ratio for the new 2.4L is 13.5:1, which is crazy high. That is even higher compression than the ND Miata, which only has very low boost FI kits available. I think power mod potential will be pretty limited for the new twins unless people do lower compression mods. Any thoughts? |
11-20-2020, 01:19 PM | #2 |
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/insert theorycrafting
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11-20-2020, 01:23 PM | #3 |
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If I had to guess it will be a fueling issue more than anything.
E85 will probably be needed to run boost levels the old stock engines could handle on pump. |
11-20-2020, 02:13 PM | #4 |
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Meth injection, e85, race gas, etc. Some will find success, some won't. Everything new has a trial and error process and we won't know until some people toe the line and cross it repeatedly.
Data acquisition is time consuming, and takes a lot of testing- we don't even have 1 person who can say they own the car, so we are a long way from having answers for anything |
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11-20-2020, 03:20 PM | #5 |
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Turboing a High compression car used to be sketchy. You had a fixed lift valve train, variable duration at best, pretty imprecise port injection and a slow 8bit ecu. We used to have to richen the mix to ensure we didn’t pre-ignite because injection systems just weren’t that precise.
Now we have super fast 64bit ECUs with literally over 10X more computing power than before. They can react ridiculously fast to changing engine conditions. We have variable lift AND duration which we can use to alter the CR on the fly. We have incredibly precise direct injection systems that can have the car run within half a percent of a stoichiometric reagent mix (14.7/1 air/gasoline). It’s a whole different ballgame now. With modern ECUs, valvetrains, and injection systems you can force feed a high compression engine, as long as you’re not tuning them like we’re in the 90s. |
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11-20-2020, 03:20 PM | #6 |
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Nothing wrong with moderate/light boost, I'm set to 9psi and that's about + 100whp, which is fine for me.
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11-20-2020, 04:16 PM | #7 | |
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11-20-2020, 04:35 PM | #8 |
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11-21-2020, 06:30 PM | #9 |
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I think low boost and e85 full time will be safe. I've been running 12-13 psi on 93 octane(310whp/255wtq) for 3 years and 4 months and I redline it daily with 0 problems since. I would think 7-9 psi with my turbo(tdo5-20g)plus e85 sounds doable.
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11-21-2020, 06:55 PM | #10 |
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The compression ratio on the turbo version of this issue is only 10.6:1.
Won't take much to over boost at 13.5:1. I see a bunch of guys saying the rods in these engines are crap in the future!
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11-21-2020, 08:07 PM | #11 |
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The fa20 boosted up easily, so will the 24
It will be the muppets with poor tuning abilities or pushing to hard that will be crying foul It is not a matter of can you, people will either turbo it or not In the end you can turbocharge anything if you use common sense and good mechanical principles The "purity" bandwagon will love telling people how they wrecked this car by adding more power though
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11-23-2020, 10:20 AM | #12 |
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So simply having high compression ratio doesn't make it a bad platform for forced induction. There is a couple factors to consider, but in general you simply have to make some changes to higher compression engines when turbocharging them. The basic principle here is that higher compression engines are more likely to experience knock at an earlier point than a lower compression engine. While this is obviously not a good thing, it simply means that you have to take a different approach to doing things.
For instance, the ND Miata has a 13.0:1 compression ratio. Because of this, aftermarket turbochargers need to be sized accordingly. The higher compression ratio allows you to run a much larger turbocharger than you otherwise could. The reason that you want to do this, is that running a larger turbocharger on less* boost is more efficient (thermally) than a smaller turbocharger. Since a higher compression motor is more prone to knock/detonate, keeping the charge air cool is critical. Using this tactic, plus modern engine control strategies and ethanol (when possible) to raise knock resistance, I'm sure the new car will boost just fine.
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11-23-2020, 11:15 AM | #13 | |
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11-23-2020, 04:58 PM | #14 | |
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