Cobb frustration

[int2str]

2008 135i (N54)

Cobb Stage 1 Sport
- CA 91 Octane
- BMS DCI
= 309hp

Cobb Stage 1 Aggressive+FMIC (Custom map)
- CA 91 Octane
- BMS DCI
- ETS FMIC
- MachtSchnell DPs
- N55 Midpipe
- Forge DVs
= 316hp (no, not kidding)

Cobb Stage 1 SportPlus+FMIC (Custom map)
- CA 91 Octane
- BMS DCI
- ETS FMIC
- MachtSchnell DPs
- N55 Midpipe
- Forge DVs
= 335hp

Opinions?

[slim_e90]

We're the conditions the same?
Eg temp and humidity?

Wondering if CA91 has such an impact?

[int2str]

Originally Posted by slim_e90

We're the conditions the same?
Eg temp and humidity?

Yes, temps and humidity about the same.

[gmane]

With those mods aren't you eligible to run stage 2+

[int2str]

Originally Posted by gmane

With those mods aren't you eligible to run stage 2+

Ran "Stage 2+FMIC Sport" briefly, but logs indicated knocking. That's why Cobb made a custom map for me (the one that pulled 315hp).

I had hoped to run Stage 2 maps, but it's not looking good for me

[sear]

Originally Posted by int2str

2008 135i (N54)

Cobb Stage 1
- CA 91 Octane
- BMS DCI
= 309hp

Cobb Stage 1 Aggressive+FMIC (Custom map)
- CA 91 Octane
- BMS DCI
- ETS FMIC
- MachtSchnell DPs
- N55 Midpipe
- Forge DVs
= 316hp (no, not kidding)

Cobb Stage 1 SportPlus+FMIC (Custom map)
- CA 91 Octane
- BMS DCI
- ETS FMIC
- MachtSchnell DPs
- N55 Midpipe
- Forge DVs
= 335hp

Opinions?

OP, you should look at some good octane booster to rule out gas but it seems like somthing else could be wrong.

Can you log boost? a boost leak might explain what you are seeing. Checking plugs might also be a good idea, but take some logs and post them. Lots of folks here on on the E90 N54 side that can help with some more data.

[int2str]

Originally Posted by sear

Can you log boost? a boost leak might explain what you are seeing.

Boost looks good (to me). Car actually made more power on LESS boost (see logs).

Checking plugs might also be a good idea

Car has 29k miles. Plugs were changed about 1k miles ago to rule out plugs...

take some logs and post them. Lots of folks here on on the E90 N54 side that can help with some more data.

Here are two logs from the dyno:
https://docs.google.com/spreadsheet/...nE0ZzFiMVMwMWc

The "Stage 1 Sport+FMIC" made 335hp, "Stage 1 Aggressive+FMIC" made 315hp.

[RnmEvo9]

Post up the graphs as peak numbers are useless to begin with. You want to look at the area under the curve.

[sear]

Originally Posted by RnmEvo9

Post up the graphs as peak numbers are useless to begin with. You want to look at the area under the curve.

X2

IATs were climbing pretty good. If these runs were on a low reading dyno like a dyno dymamics and you are getting much higher wtq peaks than these numbers might be explainable. Especially without a stock baseline. What kind of dyno?

[BFD99]

Have you tried higher octane and other maps? Seems it could be the fuel that is killing you. I know we only have 91 octane here, closest place is 100 miles, but we do have 3 places with E85 within 20 minutes.

[int2str]

Originally Posted by sear

IATs were climbing pretty good. If these runs were on a low reading dyno like a dyno dymamics and you are getting much higher wtq peaks than these numbers might be explainable. Especially without a stock baseline. What kind of dyno?

1st chart added. Don't have access to the new chart right now. WTG is now ~380ft/lbs. Dyno is Dyno Dynamics.

[int2str]

Originally Posted by BFD99

Have you tried higher octane and other maps? Seems it could be the fuel that is killing you. I know we only have 91 octane here, closest place is 100 miles, but we do have 3 places with E85 within 20 minutes.

No. Don't have easy access to higher octane, so that's pointless to me. Car has to work with the gas I have access to....

[Mr. Nice]

Those numbers seem fine to me if they are to the wheels for stage 1 91 octane, what were your torque numbers?

[int2str]

Maybe I didn't explain the problem well enough....

The car made ~310 hp with just the Cobb + DCI. Then, after adding tons of hardware and flashing a new map, the car made ~315hp on the supposedly better map and ~335 hp on an intermediate map.

Point is, that the bolt-ons alone without a tune would have probably given me more than 5hp. So the map worked WORSE than before.

Also not sure how I feel about 335hp. Certainly not the kind of number that people usually throw around here....

[Mr. Nice]

just saw 380, looks good to me for that map, not sure what you were expecting

[sear]

Originally Posted by int2str

1st chart added. Don't have access to the new chart right now. WTG is now ~380ft/lbs. Dyno is Dyno Dynamics.

getting a baseline would confirm for sure, but there is a reason they call these dyno's the "heartbreaker", LOL

My guess is that nothing is wrong. You would surely due better with some octane in those temps, but given the dyno all is likely normal IMHO. Get some NOS booster or mix 3-4 gal of e85 in a full tank and see if timing improves.

[sear]

Originally Posted by int2str

Maybe I didn't explain the problem well enough....

The car made ~310 hp with just the Cobb + DCI. Then, after adding tons of hardware and flashing a new map, the car made ~315hp on the supposedly better map and ~335 hp on an intermediate map.

Point is, that the bolt-ons alone without a tune would have probably given me more than 5hp. So the map worked WORSE than before.

Also not sure how I feel about 335hp. Certainly not the kind of number that people usually throw around here....

Most of the big hp #s come from dynojets. Big difference between these dynos

[Mr. Nice]

you won't utilize the full potential of your bolt ons running stage 1

[int2str]

Originally Posted by sear

Most of the big hp #s come from dynojets. Big difference between these dynos

Ignore the absolute numbers for a moment - I'm not interested in a hp shootout. What does bug me though is this:

After adding...
- 3" DP
- Removing midpipe cats
- Adding FMIC
- Adding Forge DVs (no HP gain, but helps hold boost)

... I get 20 rwhp. Does that sound right to you?
If it does, I guess there's no issue.

Since I was essentially going for a Stage 1 -> Stage 2 conversion though, you may understand why I'm not entirely pleased with that.

[int2str]

Originally Posted by Mr. Nice

you won't utilize the full potential of your bolt ons running stage 1

And I apparently can't run Stage 2...
So, money wasted?

[sear]

Originally Posted by int2str

Ignore the absolute numbers for a moment - I'm not interested in a hp shootout. What does bug me though is this:

After adding...
- 3" DP
- Removing midpipe cats
- Adding FMIC
- Adding Forge DVs (no HP gain, but helps hold boost)

... I get 20 rwhp. Does that sound right to you?
If it does, I guess there's no issue.

Since I was essentially going for a Stage 1 -> Stage 2 conversion though, you may understand why I'm not entirely pleased with that.

In those temps with pure 91 it sounds about right. Get some better octane and you'll likely feel an improvement in the butt dyno. Most of that gain for a single pull is really coming from the DPs. IF you look at most of the before after FMIC dynos you'll see that they don't really give you much in the way of peak HP, but rather help fill in area under the curve and make repeated pulls more consistent. I'm not sure what the Cobb tune is supposed to target in timing advance, but the timing looks low to me. Again, add octane and see what happens. Its easy to give it a try...

[BFD99]

I can understand the not having anything better than 91 octane. Maybe you could find somebody to let you try dynoing your car back to back vs. the JB4 on map 1 or map 5? I run those daily on mine with 91 and it still feels somewhat strong vs. 93 octane and map 2. Too bad you can't find E85 in your area, if you could I'd suggest mixing it half and half with 91 and getting a jb4.