New Stage 2 UEL (91-93 and E85) OTS tune files

[DarkSunrise]

Originally Posted by solidONE

Edit:
@DarkSunrise

I managed to take a log that is a bit closer to your IAT in your log, though its still a few degrees cooler: http://datazap.me/u/solidone/z61b-ho...28-136-119-110

Your earlier log marked at the same 500rpm intervals. @3500 your MAF voltage is much higher than mine. Probably making a bit more torque there than my setup: http://datazap.me/u/darksunrise/ofh-...8461-8449-8437

Nice - thanks for putting them side-by-side like that. Very easy comparison. Yeah there are a couple of places like 3500 RPM where my MAF voltage is higher but the overall average is slightly down vs. your setup. What header are you using? EL?

BTW I'll be tracking in hot weather next weekend on this tune. We'll see how it holds up. Hopefully will have a few days to dial back the top end timing and re-test before the weekend.

[solidONE]

Originally Posted by DarkSunrise

Nice - thanks for putting them side-by-side like that. Very easy comparison. Yeah there are a couple of places like 3500 RPM where my MAF voltage is higher but the overall average is slightly down vs. your setup. What header are you using? EL?

BTW I'll be tracking in hot weather next weekend on this tune. We'll see how it holds up. Hopefully will have a few days to dial back the top end timing and re-test before the weekend.

Good luck and have fun!

I'm running a long tube 4-2-1 EL header (that i traded my Tomei EL for) into a 70mm front pipe and stock cat-back. There is not a lot of power compared to even stock exhaust w/tune under 3500, but power quickly builds from 3500~5000rpm or so. If you look at the shapes of the MAFv lines you will see the difference and how it reflect the power curves. While your log does not show much of a "dip" it does not climb as rapidly at the mid range as my log. After that, 5000~redline, I'd say it's pretty much a wash.

mine: http://datazap.me/u/solidone/z61b-ho...22-100-164-173

yours: http://datazap.me/u/darksunrise/ofh-...8426-8450-8515

As nice as some of these UEL perform on top of minimal piping to radiate heat under the hood, not to mention cost effectiveness, I prefer the balance of EL headers left and right banks.

[DarkSunrise]

Originally Posted by solidONE

Good luck and have fun!

I'm running a long tube 4-2-1 EL header (that i traded my Tomei EL for) into a 70mm front pipe and stock cat-back. There is not a lot of power compared to even stock exhaust w/tune under 3500, but power quickly builds from 3500~5000rpm or so. If you look at the shapes of the MAFv lines you will see the difference and how it reflect the power curves. While your log does not show much of a "dip" it does not climb as rapidly at the mid range as my log. After that, 5000~redline, I'd say it's pretty much a wash.

mine: http://datazap.me/u/solidone/z61b-ho...22-100-164-173

yours: http://datazap.me/u/darksunrise/ofh-...8426-8450-8515

As nice as some of these UEL perform on top of minimal piping to radiate heat under the hood, not to mention cost effectiveness, I prefer the balance of EL headers left and right banks.

Yeah I can see what you're talking about in the MAFv comparison. I was actually debating whether to sell my UEL for a certain EL 4-2-1 long tube, but ultimately I just love the UEL sound. I'm probably giving up torque in the midrange but I've made my peace with that lol.

[DocWalt]

Having driven said EL vs my UEL... It's definitely different and on a race track the EL would have a clear advantage, but on the street the UEL shines.

Our UELs make tons more torque where you drive on the street, as noticed by everyone that's driven my car. The EL makes fairly equal midrange, maybe a smidgen more. The EL really shines up top though, the HP peak is a lot less noticeable as it seems to just keep pulling.

I really want to try this tune, but I can't consistently get 93 octane and I'm not really wanting to mess with MAF scaling and all that fun stuff to dial it in, lol.

[solidONE]

^ to be fair, these UEL's probably perform better than some of the EL headers all things considered. It's just the tuned long tube EL headers that target the notorious torque dip work so well. lol

I think you'll be missing out, since it's not just the more aggressive ignition advance that makes this OFH tune better. Some minor adjustments in the base ignition advance and possibly MAF scale to accommodate lower grade petrol is really not that much work at all.

[phrosty]

Are EL and UEL actually different enough that you can tell without sound and a dyno? I was under the impression that it was pretty small.

[DarkSunrise]

I was curious today and compared the OFH tune vs. UEL v2.076 in RomRaider, trying to see why it was running leaner. I didn't see any changes in MAF scaling, but the base timing, IAT timing compensation, timing advance, intake/exhaust cam advance and AFR targets had all been tweaked. I'm not an expert but the OFH tune appears to be designed to run leaner and with more ignition timing, but also with additional dialing back of timing to compensate for heat/IATs.

I ended up taking out a little base timing at medium loads in the midrange and at high loads near redline. Drove for an hour afterwards in 90 F weather. No FLKC and minimal KC (random) so things looked pretty good in the logs. Won't know for sure though until I do some repeated pulls later this week.

[Hyper4mance2k]

Has anyone figured out a fix for the USB 3.0 incompatibility?

[solidONE]

Originally Posted by phrosty

Are EL and UEL actually different enough that you can tell without sound and a dyno? I was under the impression that it was pretty small.

Most EL headers will still have the pronounced dip in torque at around 4000RPM compared to UEL with little or no dip at the same area. You will feel the difference when you try to accelerate from regular cruising RPMs. The "dip" occurs at an RPM where you'd want the most torque, IMO, if you do any kind of DDing.

[DarkSunrise]

In case anyone's interested, here are data logs from my past track weekend. For the first day, I had pulled about 1 to 1.4 degrees from base timing B from 6800 - 7450 RPM at 1.00+ g/rev.

http://datazap.me/u/darksunrise/trac...6?log=0&data=1

As you can see, was getting a lot of FLKC above 6500 RPM and IAM dropped, so I started short shifting to keep IAM at 1.00. Overall I was down about 8 mph on the straight from my best lap the previous year (in cooler temps).

Before the second day, I changed the tune to pull 2.8 to 3.15 degrees from base B timing at the same rpms/loads.

http://datazap.me/u/darksunrise/trac...6?log=0&data=1

Was still getting some FLKC above 6500 RPM and IAM dropped again, so I short-shifted. Picked up a few mph on the straight from day 1, but still down ~6 mph from last year.

I'm going to go back to my old tune for the next few track events and see how things fare.

[solidONE]

Originally Posted by DarkSunrise

In case anyone's interested, here are data logs from my past track weekend. For the first day, I had pulled about 1 to 1.4 degrees from base timing B from 6800 - 7450 RPM at 1.00+ g/rev.

http://datazap.me/u/darksunrise/trac...6?log=0&data=1

As you can see, was getting a lot of FLKC above 6500 RPM and IAM dropped, so I started short shifting to keep IAM at 1.00. Overall I was down about 8 mph on the straight from my best lap the previous year (in cooler temps).

Before the second day, I changed the tune to pull 2.8 to 3.15 degrees from base B timing at the same rpms/loads.

http://datazap.me/u/darksunrise/trac...6?log=0&data=1

Was still getting some FLKC above 6500 RPM and IAM dropped again, so I short-shifted. Picked up a few mph on the straight from day 1, but still down ~6 mph from last year.

I'm going to go back to my old tune for the next few track events and see how things fare.

Looks like your IAM barely dropped and pretty much a solid 1.0 through most of the lap quickly building back to 1.0 after it dropped to 0.98 for a few seconds on both logs. Not sure how your car ran before you made the changes, but you'll have to pull a lot of timing if you want to have it completely free of knock corrections under track abuse. Do you have a log of how it looked like before on track?

[DarkSunrise]

Originally Posted by solidONE

Looks like your IAM barely dropped and pretty much a solid 1.0 through most of the lap quickly building back to 1.0 after it dropped to 0.98 for a few seconds on both logs. Not sure how your car ran before you made the changes, but you'll have to pull a lot of timing if you want to have it completely free of knock corrections under track abuse. Do you have a log of how it looked like before on track?

Yeah that first log was when the temperature was relatively cool (first session). The FLKC looked progressively worse as the day got hotter, but I wasn't able to record those logs.

Here's a log from last year. Another hot event. I believe this was v2.074 tune slightly customized (coolant-temp timing compensation). Kind of hard to compare logs though since I was short-shifting this past weekend.

http://datazap.me/u/darksunrise/trac...3?log=0&data=1

[DocWalt]

I have my logs from last year on track (cooler weather though) with a tweaked 2.073 (reduced timing a little down low in the range that you can see the knock correction, MAF scaled, and that's about it)

I essentially never saw knock correction at high RPM. Just lift throttle (false knock IMO) and sometimes when getting on the gas quickly)

http://datazap.me/u/docwalt/10-24-15...log=0&data=1-5

http://datazap.me/u/docwalt/10-25-15...log=0&data=1-5

[solidONE]

Originally Posted by DarkSunrise

Yeah that first log was when the temperature was relatively cool (first session). The FLKC looked progressively worse as the day got hotter, but I wasn't able to record those logs.

Here's a log from last year. Another hot event. I believe this was v2.074 tune slightly customized (coolant-temp timing compensation). Kind of hard to compare logs though since I was short-shifting this past weekend.

http://datazap.me/u/darksunrise/trac...3?log=0&data=1

That does look better in terms of knock. Even with the higher oil temps.

For myself, and I'm not 100% sure what's "better", I let the computer do its thing dialing back the IAM and building it back up while I'm running on track. I also haven't been running an oil cooler so I'm running a lot hotter and getting much more knock correction than you are. I never bothered to try for a pure "track tune". I'll dial my ignition advance so there's little to no knock correction at temps higher than normal (not quite as high as what i'd see at the track) and call it a day. My IAM will fluctuate from as low as .85 to 1.0 on a track day, and run solid 1.0 with minimal FLKC otherwise. I'm pretty happy with that.