[DrRobert]

Originally Posted by Cory S

Any Dyno numbers?

no dyno yet but here is a log:

http://datazap.me/u/drrobert/96-octa...og=0&data=4-17

[houtan]

Originally Posted by DrRobert

no dyno yet but here is a log:

http://datazap.me/u/drrobert/96-octa...og=0&data=4-17

Nice! I am assuming the boost taper in the top end is due to the limitation of the stock LPFP?

[DrRobert]

Originally Posted by houtan

Nice! I am assuming the boost taper in the top end is due to the limitation of the stock LPFP?

Couldn't tell ya. The car has never run better.

[DrRobert]

Originally Posted by houtan

Nice! I am assuming the boost taper in the top end is due to the limitation of the stock LPFP?

What's weird is that the boost curve on the top end of my E30 log looked almost identical, yet it feels like night and day driving the car with the two fuels/tunes. Plus as mentioned earlier I was able to get a WOT log on E30 without misfires or codes, but could not get rid of them with acceleration from partial throttle at 4-5K RPM. I guess these logs can only tell you so much.

This is my best E30 WOT log:
http://datazap.me/u/drrobert/ptf-pur...og=0&data=4-17

[houtan]

Interesting. They do look very similar, e30 log has 2 degrees more timing advance too. But you are saying the pump gas tune feels stronger? Either way, glad you guys figured out a solution.

Have you asked dzenno about running the n20 plugs like olivejoe is running?

[DrRobert]

Originally Posted by houtan

Interesting. They do look very similar, e30 log has 2 degrees more timing advance too. But you are saying the pump gas tune feels stronger? Either way, glad you guys figured out a solution.

Have you asked dzenno about running the n20 plugs like olivejoe is running?

It's not a pump gas tune. Its half 91 octane pump gas, half 101 octane race gas, so it is 96 octane gasoline. That is approximately the same octane as E40. But please recall that my car has a Pure stage 2 turbo, and OP's car has the stock turbo.

As you know, the problem with E85 blends is that even though ethanol has a higher octane rating than gasoline the energy density is lower, so fuel volume requirements are higher and the OEM fuel pumps can become the limiting factor, thus the need for upgraded LPFP, TBI, etc. This is especially true with the PS2 turbo IME. This 96 octane fuel blend runs way better with the PS2 turbo and OEM LPFP, and yes this tune feels WAY stronger than the E30 tune. The car is pulling like crazy now, and no misfires or codes. The only drawback I can see so far is that the race gas costs about $8/gallon, but I figure I'm saving a lot of money by not having to install aftermarket LPFP and TBI or PI.

I do have the N20 plugs too BTW, gapped to 0.018" per Dzenno's advice, and had them while I was tuning for E85 blends. They did not solve the misfire problems I was having.

It seems clear to me that N55 can be flash tuned for E85 blends with the OEM turbo and fueling system, but with the PS2 turbo the OEM fueling system cannot support even E30. My car does run just fine on pump gas, but the PS2 really does appreciate the extra octane, and IME if you want to give it that you will either have to upgrade the fueling system to run E85 blends or use higher octane gasoline.

[Cory S]

Dr Robert... You should give Torco a try... It's works PHENOMINAL. Do your E30 blend, then add about 16oz of Torco to the tank. We use it on all our FI street/strip cars.

[DrRobert]

Originally Posted by Cory S

Dr Robert... You should give Torco a try... It's works PHENOMINAL. Do your E30 blend, then add about 16oz of Torco to the tank. We use it on all our FI street/strip cars.

Thanks for the tip, I might give it a try. But I think I'd add it to pump gas, not E30.

[Cory S]

Originally Posted by DrRobert

Thanks for the tip, I might give it a try. But I think I'd add it to pump gas, not E30.

You can do it either way. Having the combustion cooling properties, and oxygenation of the Ethanol in the mix may be beneficial though.

[houtan]

Originally Posted by DrRobert

It's not a pump gas tune. Its half 91 octane pump gas, half 101 octane race gas, so it is 96 octane gasoline. That is approximately the same octane as E40. But please recall that my car has a Pure stage 2 turbo, and OP's car has the stock turbo.

As you know, the problem with E85 blends is that even though ethanol has a higher octane rating than gasoline the energy density is lower, so fuel volume requirements are higher and the OEM fuel pumps can become the limiting factor, thus the need for upgraded LPFP, TBI, etc. This is especially true with the PS2 turbo IME. This 96 octane fuel blend runs way better with the PS2 turbo and OEM LPFP, and yes this tune feels WAY stronger than the E30 tune. The car is pulling like crazy now, and no misfires or codes. The only drawback I can see so far is that the race gas costs about $8/gallon, but I figure I'm saving a lot of money by not having to install aftermarket LPFP and TBI or PI.

I do have the N20 plugs too BTW, gapped to 0.018" per Dzenno's advice, and had them while I was tuning for E85 blends. They did not solve the misfire problems I was having.

It seems clear to me that N55 can be flash tuned for E85 blends with the OEM turbo and fueling system, but with the PS2 turbo the OEM fueling system cannot support even E30. My car does run just fine on pump gas, but the PS2 really does appreciate the extra octane, and IME if you want to give it that you will either have to upgrade the fueling system to run E85 blends or use higher octane gasoline.

My bad. When I said pump I meant non-85 or unleaded only. I still haven't received a tune that worked on E30-50. I am hoping to give it a try once my 91 octane tune is complete.

Agree the fuel pump upgrade is required with e85 and stg 2. But I'm guessing it's required even on the higher octane combo you arerunning because your boost tapers to 16 psi. Unless that is happening due to some sort of limitation in the Cobb. If neither are a limitation, I wonder why your boost doesn't stay flat to redline.

[DrRobert]

Originally Posted by houtan

My bad. When I said pump I meant non-85 or unleaded only. I still haven't received a tune that worked on E30-50. I am hoping to give it a try once my 91 octane tune is complete.

Agree the fuel pump upgrade is required with e85 and stg 2. But I'm guessing it's required even on the higher octane combo you arerunning because your boost tapers to 16 psi. Unless that is happening due to some sort of limitation in the Cobb. If neither are a limitation, I wonder why your boost doesn't stay flat to redline.

Yeah, I dunno. Power sure doesn't seem to taper though. We'll see what the dyno looks like. I hope to get that done in the next few weeks.

[olivojoe]

So here is an update. I had a soft limp mode (turbos shut off but car still drove) a few weeks ago while in a partial throttle situation getting on the highway. It was a one time event that I could not duplicate, but the accessport does still show the following codes: P2C58, P2CF4, P2BCO.

I sent Dzenno some partial throttle logs just to check into it, and the car ran great during the logs, and also ever since. After reviewing, he said the logs look great, but I still haven't heard back about the codes I am showing (not worried, I sent them to him late last night.)

I signed up for Datazap and loaded three of the five logs I sent him, and here they are for anyone interested. I am no expert at looking at these things so let me know what you think....

http://datazap.me/u/olivojoe/3-8-16-...og=0&data=4-13

[houtan]

I believe 2c58 is an the code for overboost. how is partial throttle drivability? Does the throttle feel linear or kind of off and on? Your logs look similar to what my 91 octane tune was doing. Throttle was on or off, there was no in between.

It was great WOT, but if I went partial throttle to accelerate on the freeway, it was like the car would just go full throttle, boost would spike up, then acceleration would die, then back up, then die. It was not fun to drive at all.

If that is what yours is doing, I would let him know the drivability is not good, and he should be able to adjust the tune. At least on 91 he was able to, but E50 may be different. It took multiple revisions, but he got my car dialed in 100% better drivability wise. Last thing we are trying to figure out is a minor drop in timing advance at the last 500RPM of the rev range. I don't need it with the stock turbo, but I want everything working 100%.

[olivojoe]

Originally Posted by houtan

I believe 2c58 is an the code for overboost. how is partial throttle drivability? Does the throttle feel linear or kind of off and on? Your logs look similar to what my 91 octane tune was doing. Throttle was on or off, there was no in between.

It was great WOT, but if I went partial throttle to accelerate on the freeway, it was like the car would just go full throttle, boost would spike up, then acceleration would die, then back up, then die. It was not fun to drive at all.

If that is what yours is doing, I would let him know the drivability is not good, and he should be able to adjust the tune. At least on 91 he was able to, but E50 may be different. It took multiple revisions, but he got my car dialed in 100% better drivability wise. Last thing we are trying to figure out is a minor drop in timing advance at the last 500RPM of the rev range. I don't need it with the stock turbo, but I want everything working 100%.

The only times I get those drivability issues you are talking about are when I do not have the DCT disabled. As soon as I hit the "fun button" though, it seems like most of the issues go away.

Another thing about those logs, some of the throttle instability might be from my foot getting jerked around by the pulls when the turbo really spools up or during a gear change. I do notice that happening from time to time.

[DrRobert]

Originally Posted by Cory S

Any Dyno numbers?

And here is my update:
PS2 turbo runs great on 96 octane (50:50 blend of 91 octane pump gas and 101 octane race gas) w/ PTF flash-only tune and stock fueling system. Dzenno nailed the tune. No misfires or codes. Here is the dyno:




And here is the log for that same dyno run:

http://datazap.me/u/drrobert/pure-st...og=0&data=4-17

So even though boost is tapering from 5000 to 6500 RPM WHP stays flat at high RPM.

[houtan]

Nice. Thanks for posting the update robert and congrats on the solid result. That log looks good. what's impressive is your fuel pump is stock and you can pass smog. obviously it rips at WOT, how does it drive around town, etc?

[DrRobert]

Originally Posted by houtan

Nice. Thanks for posting the update robert and congrats on the solid result. That log looks good. what's impressive is your fuel pump is stock and you can pass smog. obviously it rips at WOT, how does it drive around town, etc?

Awesome. Really snappy and responsive under all driving conditions. Very pleased with the improvement over 91 for a DD. I do have plans to add a HFC soon to see what further gains I can get without going catless, but will probably wait til I pass smog in May first just in case.

[feignaw]

DrRobert , it looks like you have plenty of fuel capacity left on the table with your current setup based on your log. With the boost taper you are still pulling fuel up top while maintaining a 12.0 AFR. Why did you decide to stop there with the tune?

With a PS2 you gotta be itching to crack 400+whp right?

[DrRobert]

Originally Posted by feignaw

DrRobert , it looks like you have plenty of fuel capacity left on the table with your current setup based on your log. With the boost taper you are still pulling fuel up top while maintaining a 12.0 AFR. Why did you decide to stop there with the tune?

With a PS2 you gotta be itching to crack 400+whp right?

That was my tuner's decision to stop there. We will probably do another round of tuning in a couple of months but for now I am happy to be done with tuning for a while. I would like to break the 400 whp barrier but if this car gets much faster the rear end is going to get squirrely on me and I don't want that either.