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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 02-04-2021, 11:32 AM   #15
ermax
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For me the biggest difference was with throttle blips. On 93 it pulls so much timing when blipping that often times your blips are completely ignored and you end up with a sloppy downshift. This never happens on E85.

One thing I've been working on this week is cold cranking. I'm in Florida so it's not normally much of an issue but anything bellow about 60F required two cranks. I made some adjustments to the cold cranking maps yesterday and it's much better but not perfect. This morning it cranked right up at 34F, ran for about 10secs and then stopped. Normally at 34F it would crank, start and instantly stop. So I've made progress.

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Old 02-04-2021, 08:38 PM   #16
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Originally Posted by jflogerzi View Post
Remember it's a little 2L engine. What you should feel is how smooth the car drives and the extra pull through the entire rev range.

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Yep. Im disappointed for the OP. I felt the difference immediately, especially when accelerating at WOT. I also dropped a significant amount of time from my hillclimb runs.

I run my car on E85 100% of the time.

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Old 02-04-2021, 09:05 PM   #17
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Yep. Im disappointed for the OP. I felt the difference immediately, especially when accelerating at WOT. I also dropped a significant amount of time from my hillclimb runs.

I run my car on E85 100% of the time.

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I run a blend ideally around E45 but at the track I go full e85

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Old 02-04-2021, 09:34 PM   #18
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It may not feel like a big difference, but it's actually quite significant. On 5-90 mph runs in my FR-S against my friend's s2000, he would put 2-3 cars on me stock. With E85, we are even all the way. Another way to view it is E85 changes these from high 14 second 1/4 mile cars to low 14's.

I don't think any power adder on these cars can match the power/$ ratio of E85.
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Old 02-04-2021, 09:37 PM   #19
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It may not feel like a big difference, but it's actually quite significant. On 5-90 mph runs in my FR-S against my friend's s2000, he would put 2-3 cars on me stock. With E85, we are even all the way. Another way to view it is E85 changes these from high 14 second 1/4 mile cars to low 14's.

I don't think any power adder on these cars can match the power/$ ratio of E85.
True but info do it right with flex fuel

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Old 02-04-2021, 10:44 PM   #20
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True but info do it right with flex fuel

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Admittedly it would be more convenient to not have to flash back to 98 when going cross country, but it only takes 5 min.

OFT is fine for 60-90% ethanol, but I'm pretty spoilt in that winter temps rarely go below 50 F, and I have access to pump fuel at a guaranteed 85% ethanol.
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Old 02-05-2021, 10:26 AM   #21
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True but info do it right with flex fuel

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Flex fuel definitely recommended, but I haven't had any issues running straight E85/OFT in my area. I've seen some minor variation in my LTFT's so there might be slight variations in ethanol content, but nothing beyond the adjustment window of the OFT (i.e., nothing below ~E60).
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Old 02-05-2021, 10:48 AM   #22
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It may not feel like a big difference, but it's actually quite significant. On 5-90 mph runs in my FR-S against my friend's s2000, he would put 2-3 cars on me stock. With E85, we are even all the way. Another way to view it is E85 changes these from high 14 second 1/4 mile cars to low 14's.

I don't think any power adder on these cars can match the power/$ ratio of E85.

Mmmm maybe, didn't really feel that significant to me, I was disappointed. Also a pain in the butt with the cold start thing, didn't like the backfires in the intake manifold. I'm wondering if part of it is the perceived difference from the available local pump (not referring to you specifically) - i.e. going from California 91 to E85 probably feels better than going from east coast 93. Or maybe a tune vs. setup thing. I just went FI - now that is a difference
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Old 02-05-2021, 11:27 AM   #23
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These things make 200whp na with header/e85. If you do the header first you're at 190 so the e85 is good for 10 horse after that. If you want to feel the difference, drive a stocker. You'll be amazed lol.
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Old 02-05-2021, 11:45 AM   #24
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Mmmm maybe, didn't really feel that significant to me, I was disappointed. Also a pain in the butt with the cold start thing, didn't like the backfires in the intake manifold. I'm wondering if part of it is the perceived difference from the available local pump (not referring to you specifically) - i.e. going from California 91 to E85 probably feels better than going from east coast 93. Or maybe a tune vs. setup thing. I just went FI - now that is a difference
I think it’s because e85 doesn’t really change the shape of the NA torque curve. It adds 10-15 lbs-ft evenly across the powerband, which most people will think doesn’t feel like that much. But that area under the curve adds up.

I’m not surprised FI feels like a much bigger difference, it is! It’s probably 50 lbs-ft or more at certain parts of the powerband.
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Old 02-05-2021, 11:51 AM   #25
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These things make 200whp na with header/e85. If you do the header first you're at 190 so the e85 is good for 10 horse after that. If you want to feel the difference, drive a stocker. You'll be amazed lol.
This actually makes a lot of sense.. which is accurate in my case.. Catless header/overpipe/and full exhaust all prior to and stage2+ prior to stage2+ w/e85.. so basically, there wasnt much meat left on the bone for me hahah
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Old 02-05-2021, 11:59 AM   #26
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.. so basically, there wasnt much meat left on the bone for me hahah
That's........not how that works.
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Old 02-05-2021, 12:04 PM   #27
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That's........not how that works.
??
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Old 02-05-2021, 12:09 PM   #28
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I think it’s because e85 doesn’t really change the shape of the NA torque curve. It adds 10-15 lbs-ft evenly across the powerband, which most people will think doesn’t feel like that much. But that area under the curve adds up.

I’m not surprised FI feels like a much bigger difference, it is! It’s probably 50 lbs-ft or more at certain parts of the powerband.

Yeah that's a good point - cumulatively it'll make a significant difference, just not so much with the butt dyno In the end it wasn't worth it because I live in CT, I think there are maybe 2 or 3 E85 stations in the WHOLE STATE. One happens to be 'close' in Greenwich, but that's still 1/2 hour drive for me :/
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