[benzy89]

Originally Posted by Spoolin Montego

I also have a flat spot in the range 2700-2900 in all gears, possible my stock diverter valves are leaking?

Flat Spot = ??? A P30FF fault code is the traditional sign of a boost leak.

[Spoolin Montego]

Originally Posted by benzy89

Flat Spot = ??? A P30FF fault code is the traditional sign of a boost leak.

Flat spot meaning I load the gear it builds full boost and starts pulling but then doesnt pull has hard or drops a few psi during those revs...I just pulled the codes and there were none

[benzy89]

Originally Posted by Spoolin Montego

Flat spot meaning I load the gear it builds full boost and starts pulling but then doesnt pull has hard or drops a few psi during those revs...I just pulled the codes and there were none

Normal, my car doesn't really kick until it's between 3k-3.5k. Because you've increased the boost (Stock is ~8psi, Stage 1 is 12-14 psi depending on the Specific Map), it's not going to feel lag-less like it used to.

And if you're driving "spirited", you're prob not gonna be under 3k

[Sered]

I'm betting the closure was DTC/DSC. My car squats and makes a mild wiggle when the torque hits, a bit due to the lowered suspension, tighter shocks, but stock bushings. I really need LSD and M3 subframe upgrades.

[Sered]

First run I only got to 6k and ran out of room. Second run was to 6300, both started from 3000ish.

And let me say, that was the first time I completely turned off DTC/DSC, normally I just turn off DTC. The car is pretty wobbly and granted this stretch wasn't the best road in the world, but it was by no means bad. The car meandered a good bit, I can see why the TPS would be closing.

Looks like it still closed some :/ Wow on the 2nd one, I was changing lanes gradually to avoid a pothole and some bumps. I'll just run this again tomorrow on the interstate a few times.

[VNeBLOB42]

Originally Posted by Sered

Yup was WOT.

I'll double check after this and see, but I didn't see any throttle closures, but I may just be reading it wrong.

Just remove the .txt extension

I see what you're saying, I was not seeing it at first. The TPS % wavers a bit and never gets above 80ish, I'm wondering if this is because I had DTC fully on; I did not turn it off because I assumed it wasn't a factor in 3rd gear where I didn't have traction issues.

Should I run this again with DTC fully off?

Originally Posted by benzy89

If your TPS isn't hitting & maintaining a value at 80.98, then you're not taking most accurate logs. I see that you hit it a few times between 24-28 seconds, but go back & forth between the high-70s. This explains why you're getting timing corrections (timing corrections are normal during when accelerating, not at consistent WOT).

If you can, try to take a log on a long enough street where you can hammer through all of 3rd gear (little easier to maintain those speeds). I'd recommend that you get your DTC off, hold 2,500 RPMs in 3rd gear, start the log & hammer it from just under 3k all the way to 6,500 RPMs. Try to do a get a few of those & post them up.

^^ This

+1

[VNeBLOB42]

Originally Posted by Spoolin Montego

for CA guys, how many gallons of 91 and E85 are you guys mixing to run the E30 map?

I also have a flat spot in the range 2700-2900 in all gears, possible my stock diverter valves are leaking?

http://www.intercepteft.com/calc.html

Keep in mind that E85 is more like 96 USA Octane, its 105 Ron. So compare apples to apples 91 octane and E85 is 96 octane.

4.5 Gallons of E85 blended with 91 to get E30, taken that 91 is 10% Ethanol and E85 is 85% Ethanol.

Please be sure to do a log, COBB designed that mapping with E85 and 93 Octane. not 91

[VNeBLOB42]

Originally Posted by Sered

First run I only got to 6k and ran out of room. Second run was to 6300, both started from 3000ish.

And let me say, that was the first time I completely turned off DTC/DSC, normally I just turn off DTC. The car is pretty wobbly and granted this stretch wasn't the best road in the world, but it was by no means bad. The car meandered a good bit, I can see why the TPS would be closing.

Looks like it still closed some :/ Wow on the 2nd one, I was changing lanes gradually to avoid a pothole and some bumps. I'll just run this again tomorrow on the interstate a few times.

yeah, you got some Throttle closures. Always have DTC/DSC completely off when doing logs.

by the looks of your log, you were 2nd gear then shift into 3rd then WOT Correct?

timing corrections are pretty noisy, usually I like to see 3 or less cyl. with 3.38 or lower, you got all 6.

to clean up throttle closures you have to dial back WGDC and or up the load, but that is above my expertise. you can do that in ATR.

try to find a good safe stretch of road, you should not be dodging pot holes or traffic. get in gear 3 hold it at 2500 RPMS, start COBB, wait a sec then WOT. Read this thread it will help you.

http://www.e90post.com/forums/showthread.php?t=696472

This may be too aggressive for your setup. are you 93 octane? Do some more logs where conditions are better. to really determine.

What is also interesting, your Boost is over 18.5, I'd thought COBB OTS max out at 18.5? Maybe overboost is causing the throttle closures? @Benzy89?

Originally Posted by benzy89

?

[Sered]

Originally Posted by VNeBLOB42

yeah, you got some Throttle closures. Always have DTC/DSC completely off when doing logs.

by the looks of your log, you were 2nd gear then shift into 3rd then WOT Correct?

timing corrections are pretty noisy, usually I like to see 3 or less cyl. with 3.38 or lower, you got all 6.

to clean up throttle closures you have to dial back WGDC and or up the load, but that is above my expertise. you can do that in ATR.

try to find a good safe stretch of road, you should not be dodging pot holes or traffic. get in gear 3 hold it at 2500 RPMS, start COBB, wait a sec then WOT. Read this thread it will help you.

http://www.e90post.com/forums/showthread.php?t=696472

This may be too aggressive for your setup. are you 93 octane? Do some more logs where conditions are better. to really determine.

What is also interesting, your Boost is over 18.5, I'd thought COBB OTS max out at 18.5? Maybe overboost is causing the throttle closures? @Benzy89?

Yup, 93 octane. I'll do another few runs on the interstate tomorrow.

What is interesting is that the first two runs did not have the timing pulls like the later two did.

[benzy89]

Originally Posted by Sered

First run I only got to 6k and ran out of room. Second run was to 6300, both started from 3000ish.

The logs ok (still need better data), and while you're having lots of timing corrections from 34 to 37, you're okay. The danger sign is that you have 3, 3+ values next to each other (which you don't).

I'm gonna try to take remote load an old log & link the URl here that showcases a quality log. I would upload directly on her, but unfortunately I can't because the Admins have revoked my ability to PM or Upload Attachments.

[benzy89]

Guess I can load txt files. Here's a good log, I've deleted the excess information so let me point out the stuff to focus on.

• TPS Value of 80.98 is consistent from 3200 RPMs all the way out to 6200 (ideal data log RPM range)
• Zero Timing Corrections during the pull
• AFRs hit target of 12-13 throughout the pull (12 is the ideal value)
• LTFT & STFT never come close/exceed 25 (max'd out value)
• I deleted my Boost curve out of respect for my tuner (Jake@PTF), but I'm using Stockers & my curve holds 18 psi for a little time. It's okay as long as it's midrange (4k-6k), it just needs to get back down to sub-14 by redline.

If I had the time I'd go take a better log & wind it out from 2,500 RPMs to 6,500, but you get the idea. It does suck taking logs, but once you find an open stretch of road with low traffic it's great. If you can, try even taking a log as you merge onto a highway since 3rd gear around 2,500 RPMs is basically 45 MPH & ends around 95 when you get to 6,500 RPMs.


Looking at your logs again, it looks like it's hot as fux outside (100+ the whole time) which kills performance. Your AFRs are a little lean for my taste (high 14 values, briefly 15), the Boost is okay because it's midrange & tapers back down to 13/14 at Redline.

Like I said original, try to hold 2,500 RPMs & start logging. Once the screen flashes that it's started, stomp on it & ride out 3rd until 6k+. I'd also recommend that you change on your AP from logging Timing Cyl. 1 to Cylinder 3-5. It'll just give you a better reading since Cylinder 1 is the furthest from the TB.

[VNeBLOB42]

Originally Posted by Sered

Yup, 93 octane. I'll do another few runs on the interstate tomorrow.

What is interesting is that the first two runs did not have the timing pulls like the later two did.

From what I understand, DME starts to pull timing above 105 IAT. Which explain why on your third pull you have some. Really no problems, like benzy said.

[Sered]

Well to be fair I had been driving the car for about 25 minutes and parked it. It was only 75 outside, but had been sitting for a bit after driving.

I'd like to know why I'm boosting at 19.5psi though as the Cobb has a max set for 1.28bar (was just looking through ATR). Think I may need to dial down the WGDC some? If so is there an explanation for the half dozen values that make up the WGDC settings? I'm assuming it's just the base duty cycle that I should be looking at as the others deal in special conditions and special correction factors.

[VNeBLOB42]

Originally Posted by Sered

Well to be fair I had been driving the car for about 25 minutes and parked it. It was only 75 outside, but had been sitting for a bit after driving.

I'd like to know why I'm boosting at 19.5psi though as the Cobb has a max set for 1.28bar (was just looking through ATR). Think I may need to dial down the WGDC some? If so is there an explanation for the half dozen values that make up the WGDC settings? I'm assuming it's just the base duty cycle that I should be looking at as the others deal in special conditions and special correction factors.

Not sure what to do and or how to. . There may be ATR threads on here to help you.

I know of one, but I'll get banned for telling you. Funny how that works. Put it together vertically, you get the idea. Look for ATR thread under n54.

Bimmer is.a.nice.car
Boost is good
dot com

[MikeS300]

Originally Posted by Sered

Well to be fair I had been driving the car for about 25 minutes and parked it. It was only 75 outside, but had been sitting for a bit after driving.

I'd like to know why I'm boosting at 19.5psi though as the Cobb has a max set for 1.28bar (was just looking through ATR). Think I may need to dial down the WGDC some? If so is there an explanation for the half dozen values that make up the WGDC settings? I'm assuming it's just the base duty cycle that I should be looking at as the others deal in special conditions and special correction factors.

It looks like the throttle closures may be due to overboosting. I'm not an expert but I was having problems with severe throttle closure due to the computer protecting the car in an overboost situation. Look at your Req. Boost ABS and Boost Mean ABS. When the Boost Mean ABS begins to exceed the requested boost then the TPS Act will drop off to protect the car. I just worked with someone at Cobb who helped me to adjust the WGDC (base) table in ATR and my problem is almost fully corrected.

You should also log MAF Req. (WGDC) and Boost Setpoint Factor. These make up the two axes on the WGDC (base) table in ATR. Once you log those it will be easier to adjust the table downwards a bit where you are overboosting and this should help eliminate throttle closures. Did you say datalog3 was done with traction control fully off? (holding down DTC for several seconds)

[eriktufa]

Guys,

Do you think this log looks ok?

[VNeBLOB42]

Originally Posted by eriktufa

Guys,

Do you think this log looks ok?

looking pretty good my friend.

did you have DTC/DSC completely off? you had a slight throttle closures around 4k range (TPS ACT.). Pretty consistent with each log. do a couple more and upload them to be sure. Are you on a long flat road?

by the looks of things are your S1 Agg? provide some more info, mods, gas, MAP, gear etc.


I can't upload attachments, because e90 is lame,

But looking at the graphs you do have a slight over boost at the RPMs where the Throttle closures happen. That maybe the cause. @MikeS300 just went through the same thing, read his post a couple up.

[eriktufa]

Originally Posted by VNeBLOB42

looking pretty good my friend.

did you have DTC/DSC completely off? you had a slight throttle closures around 4k range (TPS ACT.). Pretty consistent with each log. do a couple more and upload them to be sure. Are you on a long flat road?

by the looks of things are your S1 Agg? provide some more info, mods, gas, MAP, gear etc.


I can't upload attachments, because e90 is lame,

But looking at the graphs you do have a slight over boost at the RPMs where the Throttle closures happen. That maybe the cause. @MikeS300 just went through the same thing, read his post a couple up.

Good to hear and thanks for the help

Yes, My DTC and DSC were off.

I'm using S1 Agg LT, no mods, 98 RON, 65000 km (if that helps).

Some of the road were not straight and flat, the first datalog (Datalog 2 was on a long stretch flat road.

I'll probably get more datalog before conclude that I have overboost issue but if I do I'll speak with Cobb.

[MikeS300]

If I could change the subject for a moment, I would like to talk about a lean condition on spooling. I looked around different forums and this has been discussed as a phenomenon related to some different types of tunes. I could not find much related to Cobb.

So I'm running Stage 1 Aggressive on 93 octane that has been tweaked by me to avoid boost overshoots. When I have been doing my WOT runs I usually start around 2000 rpm and go for it. I am set to use the spool fuel tables up to 3000 rpm like most of us. I noticed that my actual load can get in the high 100s during spool and that my AFR will go as high as about 16.1 and then it will start dropping after I get out of spool mode and hit about 12.2 in the higher RPM range.

Is this condition during spool where I hit 15 to low 16s AFR a reason for concern? I am working with someone at Cobb who is having me go into ATR and at the highest loads (in the Fuel (spool) table) up to 3500 rpm I am dropping the requested AFR by about 0.5 to 0.4 to try to richen things up a bit. Attached is a log from yesterday that shows what I'm talking about. I even logged fuel mode to show that my high AFRs happen in fuel mode "20", or spool mode. Any advice is appreciated. I need to do some more runs with my AFR richened up in the spool table if you guys think it is necessary to richen things up.

[VNeBLOB42]

Originally Posted by MikeS300

If I could change the subject for a moment, I would like to talk about a lean condition on spooling. I looked around different forums and this has been discussed as a phenomenon related to some different types of tunes. I could not find much related to Cobb.

So I'm running Stage 1 Aggressive on 93 octane that has been tweaked by me to avoid boost overshoots. When I have been doing my WOT runs I usually start around 2000 rpm and go for it. I am set to use the spool fuel tables up to 3000 rpm like most of us. I noticed that my actual load can get in the high 100s during spool and that my AFR will go as high as about 16.1 and then it will start dropping after I get out of spool mode and hit about 12.2 in the higher RPM range.

Is this condition during spool where I hit 15 to low 16s AFR a reason for concern? I am working with someone at Cobb who is having me go into ATR and at the highest loads (in the Fuel (spool) table) up to 3500 rpm I am dropping the requested AFR by about 0.5 to 0.4 to try to richen things up a bit. Attached is a log from yesterday that shows what I'm talking about. I even logged fuel mode to show that my high AFRs happen in fuel mode "20", or spool mode. Any advice is appreciated. I need to do some more runs with my AFR richened up in the spool table if you guys think it is necessary to richen things up.

Since I can't attached items, I can email you my S1 agg. logs if you like? to compare?

[Ænema]

Spool mode is there to help "spool" the turbos. You can richen up the AFRs if you want to, you're not going to see any ill effects. In fact, you can completely disable spool mode if you want.

[MikeS300]

When you say that you can disable "spool mode" are you referring to disabling "lean spool mode" in ATR? If so, then that is disabled by default and I have never run "lean spool" mode. I don't think I would want to disable any other type of spool mode, but I would feel more comfortable if I did not hit 16 AFR.