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Old 11-24-2017, 02:07 PM   #2301
Jimpreza111
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Beautifully explained Dirt Bringer!

I too love the power of the E85 and just wished it was a readily available fuel in my area.
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Old 11-24-2017, 03:25 PM   #2302
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I wish TH would reply to my email.
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Old 11-24-2017, 03:34 PM   #2303
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Just heard from him the other day, 24hr turnaround.
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Old 11-24-2017, 06:41 PM   #2304
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Originally Posted by Jimpreza111 View Post
Beautifully explained Dirt Bringer!

I too love the power of the E85 and just wished it was a readily available fuel in my area.
I wish it wasn't so hard to start in the cold
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Old 11-24-2017, 07:37 PM   #2305
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I wish it wasn't so hard to start in the cold
No doubt, if it was available to me it could only be summer gas.
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Old 11-24-2017, 07:39 PM   #2306
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I wish it wasn't so hard to start in the cold
how much harder or less hard is it compared to something like this

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Old 11-24-2017, 09:38 PM   #2307
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how much harder or less hard is it compared to something like this

https://youtu.be/Um_YwrrqxjM?t=75
50% better.

it is really tough to start straight e85 on our cars in cold temps, below freezing, the recommendation is to essentially fill up 50/50 mix of 91 or 93 and e85.

too much work
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Old 11-25-2017, 01:21 PM   #2308
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Originally Posted by flyboy1100 View Post
I wish it wasn't so hard to start in the cold
My experience with E85 was that it helps a lot to prime the engine before starting. So give it a quick turn over with the key, stop, then start the engine. No idea what effect this has on the starter. On one of the planes I fly there is a limitation on how quickly you can crank the engine over again if it doesn't start immediately due to heat build up in the electric motor, this may be due to the starter being lightweight and by consequence small, but the voltage spike when you first turn over an electric motor does contribute a lot to heat in it. Either way the priming seems to have a positive impact on starting. When I ran E85 I'd do that and have a clean quick start every time.
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Old 11-25-2017, 08:48 PM   #2309
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I love how you explained airplane starter limitations to a user with "flyboy " in his username

And since i am on my 3rd starter in 140k i have zero faith in my starter to handle extra workload and most of the time my car gets started less than 4 times/day it is driven
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Old 11-28-2017, 12:02 AM   #2310
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Originally Posted by Dirt Bringer View Post
The efficiency should also be theoretically better, but I never saw a difference between 87 and 91 tunes. I used to run 91 and loved it. I ran E85 for quite a while and the power was fantastic. I now run 87 for financial reasons and don't mind. The tune is so good that the driveability between the three is basically the same, only the actual acceleration rate of change is different.

Hope that helps clear things up.
Thanks for that.

I recently put the 91 octane tune, and am running 87 till my next fill up.

I will have to relearn how to get the most out of this engine again.

Last edited by Pelco; 11-28-2017 at 01:01 AM.
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Old 11-28-2017, 02:23 PM   #2311
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My IAM runs 0.75 when I use 87 on the 87/89 tune but 1.00 on 89.
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Old 11-28-2017, 02:28 PM   #2312
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My IAM runs 0.75 when I use 87 on the 87/89 tune but 1.00 on 89.


What is IAM? Cant think of that acronym
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Old 11-28-2017, 03:43 PM   #2313
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Ignition advance multiplier. A favorite of the WRX/STI tuning crowd, if it's running below 1.00 your tune isn't absolutely perfect because it's pulling timing. Of course that's not the whole story, if it's retarding timing on decel with DFCO who the hell cares? If it's cutting timing massively on acceleration then it's bad, but I'm not seeing that. Just something to consider though. It does show a bit lower than perfect.
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Old 12-02-2017, 03:25 AM   #2314
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Ignition advance multiplier. A favorite of the WRX/STI tuning crowd, if it's running below 1.00 your tune isn't absolutely perfect because it's pulling timing. Of course that's not the whole story, if it's retarding timing on decel with DFCO who the hell cares? If it's cutting timing massively on acceleration then it's bad, but I'm not seeing that. Just something to consider though. It does show a bit lower than perfect.
Thanks for that. Where does one find IAM values? What application?
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Old 12-02-2017, 04:06 AM   #2315
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I've been running the 5A 91/93 tune with 91 octane here in L.A for a week now.

Notes:
Stock tune, power band is between 2-4k RPM. It drops off quickly after 4k. There is a definite surge between those ranges and you can use that to your advantage when merging, passing, or just plain douche-bagging your way through traffic

5A tune, power band is more subtle, but there is something around 3-5k. The whole range of RPMs ramps up in a linear fashion with no major spikes or dips. At least none that are as noticeable as the stock power band. It's a smoother curve and the power is distributed throughout the range. I am still working on finding a grove to get my hoon on.

The way I've been testing to find these power bands is: Roll from stop and accelerate moderately to just before said RPM, hold for a couple of seconds around said start RPM, then accelerate hard, not flooring it, but more aggressively. Basically a 20-60mph pull.

The engine, at least with the CVT and stock exhaust, creates a nice distinct sound around 3k regardless of tune.

If you don't bog it before getting the start RPM, you should be rewarded with a little "boost" in torque and acceleration. I tend to think of this method as building up and sustaining manifold pressure so that it is close to neutral. When you want to get the punch, you apply hard acceleration, and it basically acts like boost/turbo. Only that instead of spooling and positive manifold pressure, it's closer to compressing the normally negative manifold pressure to neutral at which point your engine theoretically is running more efficiently.

I've tested this in first, second and third gear pulls all the way to redline.

The 5A tune definitely is missing a defined punch. But the over all power output is greater, distributed much more evenly throughout the rpm range. I think when the engine is singing at 4.5-5k RPMs then that might be peak HP.

Does anyone else have any observations they would like to share?
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Old 12-02-2017, 04:28 PM   #2316
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Thanks for that. Where does one find IAM values? What application?
I get it from ActiveOBD on Android. If you can find the IDs that the ECU posts the value to, I think there's some way you can add it to torque but I just use ActiveOBD.
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Old 12-02-2017, 04:29 PM   #2317
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I get it from ActiveOBD on Android. If you can find the IDs that the ECU posts the value to, I think there's some way you can add it to torque but I just use ActiveOBD.
Cool I have both. I will look at activeODB. And see what my numbers are. So you say. The closer to one, the better?
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Old 12-02-2017, 04:55 PM   #2318
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Completely random irrelevant question but does anyone know why I keep hearing slightly older Hyundais and Kias that sound exactly like a Honda engine starting? I'm sure you all know they have a really distinct startup sound, never noticed them in Kyundais before.
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Old 12-04-2017, 07:21 PM   #2319
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Originally Posted by Pelco View Post
Cool I have both. I will look at activeODB. And see what my numbers are. So you say. The closer to one, the better?
With Rev5b tune, I have not seen IAM go below 1 even when I use 87 gas on 91 tune. I have seen IAM go down to as low as ~0.5 on stock tune.
Makes me wonder of TH's tune doesn't use IAM?
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Old 12-05-2017, 12:17 AM   #2320
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Where do you find the IAM number in the active ODB app?

Over the weekend I had to reset my ECU with the app because I was getting a check engine light. After a reset my ECU had to relearn the air/fuel again so I started a new. After a couple hundred miles it's nice an set in the tune.

There is a definite yum yum effect at 3k maybe that's where the exhaust note starts to sound good, but I feel like there more juice happening starting @3k.
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Old 12-05-2017, 01:48 PM   #2321
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Where do you find the IAM number in the active ODB app?
.
Third page, top right is where it shows up in my active OBD app.
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Old 12-07-2017, 12:11 AM   #2322
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5A tune with 91 octane keeps surprising me. It may be that it's getting colder in Los Angeles and the cold air is affecting (noticeably increasing) the power output, but I've driven more than 200 miles with the tune. I think it's settled now.

It feels pretty satisfying while driving in manual mode. Keeping the revs closer to 2.8k-5.2k I think is the sweet spot. Using the engine braking to keep the revs up. The engine puts down power much easier than starting from low RPMs if you are rolling, using very little brakes.

I've found that engine braking with the tune is much different. I used to never drop to 1st gear while slowing down. With the stock tune, dropping to 1st gear usually has a extremely heavy braking effect shooting RPMs way up. With the 5A tune, the engine braking effect is lower. It's hard to explain, but it's like the compression is less, and the car won't jerk as much. This was hard to deal with when I switched over from stock tune, but after a while I prefer the 5A tunes engine braking characteristics.

Throttle response in 5A is still touchier than the stock tune. But like engine braking, you get use to it. To start slow, in manual mode, your really have to feather the accelerator pedal so it doesn't rev up. The torque converter is very sensitive.

All in all, I feel much sportier driving in 5A manual mode. Keep those revs up!






I pulled a 106wheel HP off of torque app and 180nm torque.
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