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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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08-15-2019, 07:58 PM | #29 | |
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Right on! Thanks; Yeah E85 is plentiful around me. I dont really see making any changes for more power after this. I might want to do a track day maybe a couple times a year, and weekend autoXs. Its going to be my daily for the spring, summer, fall but my commute is very easy. Only 12 miles, mostly highway... Only thing is i really wanted to be able to drive it cross country out to CA to visit my buddy and do a track day out there with him. But I might just need to buy a trailer and haul it if I want to do that... |
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08-15-2019, 08:15 PM | #30 | |
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08-15-2019, 08:36 PM | #31 | |
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I would just read that link I posted. Here it is again, but read more about what others said than myself; those who lowered compression: http://www.ft86club.com/forums/showt...pression+ratio In the beginning I was in the camp that E85 was enough for 400whp, that it only made sense to drop compression when wanting more power than that, or if someone was going to spend a lot of time on 91 octane, but it seems like if anyone is going to be doing track days, wants more power off E85, more power potential down the road, etc then might as well drop the compression. In fact, several guys with lower compression motors chimed in and their responses confirmed the benefits. You are in the E85 capital of the country, practically, so access isn't an issue, but for reliability, I would consider dropping compression, especially if you will be doing track days.
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08-15-2019, 08:55 PM | #32 |
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There might be more turbo lag and less fuel economy and less power off of boost, but if those detriments were 200rpms, 3mpg and 15hp@2k, respectively, then wouldn't the reliability improvement be worth it, especially for track days?
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08-16-2019, 04:21 AM | #33 | |
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Just sharing some knowledge about what those companies prefer, not trying to tell you you're wrong. Many different ways to make power.
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08-16-2019, 06:19 AM | #34 |
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Or simply there are more ways to skin a cat, netting same result/output at end.
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08-16-2019, 08:51 AM | #35 |
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When these cars first came out, it was commonly thought that even 10:1 compression was high compression, and people thought with 12.5:1 that no way this can handle any boost, then people tried it and thought, OK it can handle it but 7psi is the limit, and then they kept testing it and pushing it and its been shown that even 12-13psi is pretty reliable on a stock engine. Many tuners in recent years now have changed their thoughts on needing to lower the CR stating its not really necessary, and often times not recommended.
New tuning methods, the cars ability to monitor so many parameters and give instant feedback, being able to adjust and tune so many parameters, and having both PI and DI, has allowed tuners to safely push these cars closer to the edge, as well as push the edge further out, allowing for safe reliable power with out needing to drop the CR. 400whp on E85 is easy to get with stock CR, I would possibly consider 12:1 for a slight added margin of safety and being able to push the car more in the future if desired. but much lower doesn't seem necessary or worth it on these cars, unless your shooting for some crazy numbers. Hearing from people who dropped CR stating its worth it or recommended doesn't really say much. I would much prefer hearing from people with built engines and kept stock CR and what their tuner said was the limiting factor for reliable power. |
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08-16-2019, 10:50 AM | #36 |
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I remember 35 years ago doing 10 to 1 on a 351 Windsor in my 73 Bronco. At the time that was a premium gas only engine.
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08-16-2019, 11:25 AM | #37 | ||
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Another view on this are the stock motors built by Honda (I know different engine). I have seen even the type-r engines (both B and K series) push around 350-400 whp on stock blocks w/ boost (these are already running 11:1 or 11.5:1 CR iirc from factory) and still driving fine. |
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08-16-2019, 01:30 PM | #38 |
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It would be interesting to see 400whp at 10:1 and at 12.5:1 on the track. Specifically, would the temps be much different and would the cars still be putting down 400whp or would the 12.5:1 be compensating with ignition timing.
We have a few people who have blown built motors too. Curious what their compression ratio was.
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08-16-2019, 03:27 PM | #39 |
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Maybe @Sportsguy83 can chime in. Didn’t he make like 553whp on a stock block or something freaky? Maybe 400whp is nothing, even for the track.
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08-16-2019, 05:39 PM | #40 | |
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552 on stock block, but that’s just a ticking time bomb..... I pushed it on 500 whp map, the 552 map was very rarely used. If I would have built the FA20, it would have been because I trust the shop that built it and wouldn’t ace any worries tracking it at 400 whp... but I don’t know if there’s any track record out there for built cars being used hard on the track at that power level. There has to be, but I personally don’t know.
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08-16-2019, 06:00 PM | #41 |
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08-17-2019, 01:13 PM | #42 |
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What do you guys think of keeping the comppression at 12.5:1 if I'm only gonna be using 93 octane on boost at around 300-350 whp?
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