[335i E92]

Not looking to start a tuner war here, just looking for some advice specific to my needs.

Had the Evolve stage 2 for a couple of months now and finding myself wanting a little more midrange. Don’t get me wrong car is quick and I love the smooth linier power delivery that the Evolve flash provides, however it just feels a little too linier in the higher gears and whilst I wouldn’t trade it for an on/off power delivery I feel like i'm wanting more.

Been keeping my eye on Cobb, like the sound of the stage 2+ aggressive map and flexibility of map switching. Cobb seem to target more boost (around 16-17) which I’m pretty sure will deliver the additional mid range I’m chasing.

Anyone have any knowledge or experience of both maps? Will Cobb stage 2 + aggressive deliver more midrange given the higher boost targeting?

[phil200tdi]

Stack a jb4 on top of the evolve stage 2 tune. Add more boost in the midrange. Plus get benefit of steering wheel controls and gauge hijacking. Oh and meth integration should you want more!!

[335i E92]

Considered that but thought boost on map 2 on the JB4 is only around 14psi which is the same as Evolve stage 2?

[phil200tdi]

No, you use a bespoke map (map 6) and input the boost you wish to target at a given rpm. There was a thread on stacking JB4 on Cobb recently here:

http://www.n54tech.com/forums/showthread.php?t=15047

same principle on the evolve map you have...

[Alpina_B3_Lux]

I had GIAC stage 2 before going over to COBB (but more due to the compatibility with bigger turbos and bespoke map development possibilities).

The COBB stage 2+FMIC aggressive felt definitely more powerful than the GIAC stage 2 (which I dynoed at 433hp / 677Nm). GIAC targeted 16.5psi, COBB goes up to 18.5psi, which explains it. Also the boost ramps up more quickly with COBB.

Hope this helps.

Alpina_B3_Lux

[335i E92]

Originally Posted by phil200tdi

No, you use a bespoke map (map 6) and input the boost you wish to target at a given rpm. There was a thread on stacking JB4 on Cobb recently here:

http://www.n54tech.com/forums/showthread.php?t=15047

same principle on the evolve map you have...

Interesting, tnx for the link!!

[335i E92]

Originally Posted by Alpina_B3_Lux

I had GIAC stage 2 before going over to COBB (but more due to the compatibility with bigger turbos and bespoke map development possibilities).

The COBB stage 2+FMIC aggressive felt definitely more powerful than the GIAC stage 2 (which I dynoed at 433hp / 677Nm). GIAC targeted 16.5psi, COBB goes up to 18.5psi, which explains it. Also the boost ramps up more quickly with COBB.

Hope this helps.

Alpina_B3_Lux

Tnx for the info... Is 18.5psi considered ok for stock turbos or is this for RB's?

Dyno figures are impressive, how does the Cobb deliver on the road? Is it progressive / predictable?

Cheers

H

[phil200tdi]

Is 18.5psi with meth flowing?

Sounds very aggressive if not. I would say 100 octane race gas and/or cold temperatures would be recommended by Terry to run with boost this high..

[Nigelo]

I think Cobb run less advance timing, but crank the boost up instead. They taper it downwards as you head up the revs to keep the turbos in their efficiency range. This approach really does need a better intercooler and downpipes to keep the temps down.

Didn't realise they went up to 18.5psi though!

[project335i]

Originally Posted by Nigelo

I think Cobb run less advance timing, but crank the boost up instead. They taper it downwards as you head up the revs to keep the turbos in their efficiency range. This approach really does need a better intercooler and downpipes to keep the temps down.

Didn't realise they went up to 18.5psi though!

This sounds great, so basically I can slap on abigger IC and downpipes with the Cobb and should see good results with the stage 2 map. Am I correct

[335i E92]

Not running meth and don't plan too, currently FBO 'ETS intercooler & AR catted DP's)

I feel 18.5 is a bit ott for stockers, was under the impression stage 2+ Cobb was 16.5 - 17 tops.

[Jeff@TopGearSolutions]

Originally Posted by Nigelo

I think Cobb run less advance timing, but crank the boost up instead. They taper it downwards as you head up the revs to keep the turbos in their efficiency range. This approach really does need a better intercooler and downpipes to keep the temps down.

Didn't realise they went up to 18.5psi though!

I agree.

As much as the turbo's are their efficiency range more boost still does create more heat. For anyone going to stage 2 boost its recommended to purchase an aftermarket intercooler. In fact if you talk to Cobb they recommend and intercooler as one of their first mods although its not required. The intercooler will provide better consistency pull to pull, keep intake air temps in check, which would allow for better safety margin, and overall engine safety.

[project335i]

Originally Posted by Jeff@topgearsolutions

I agree.

As much as the turbo's are their efficiency range more boost still does create more heat. For anyone going to stage 2 boost its recommended to purchase an aftermarket intercooler. In fact if you talk to Cobb they recommend and intercooler as one of their first mods although its not required. The intercooler will provide better consistency pull to pull, keep intake air temps in check, which would allow for better safety margin, and overall engine safety.

Very good info. Thanks for that

[335i E92]

Looking on Cobb’s site they list the below Stage 2+ FMIC map options of which all require upgraded DP’s, FMIC and intake (which can be panel filter)

Drive map: Daily driving map with nice bump in power. Stock rev limiter.

• Stock or Linier throttle option
• Fuel: Prem 91

Sport map: Sporty map with a healthy performance increase. Raised rev limits.

• Stock or Linier throttle option
• Fuel: Prem 91

Aggressive map: Maximum power and torque. 93 octane fuels and above. Raised rev limits

• Stock or Linier throttle option
• Fuel: Prem 93

I’ve e-mailed Cobb to get a break down of boost targets set for each map and will report back.

Also I’m confused regarding the requested fuel grade on the aggressive map as it states 93, Is this equivalent to our Shell V power / Tesco Momentum (99) or are we talking proper race gas required for the aggressive map?

[neil@JuicedUpTuning]

Originally Posted by 335i E92

Also I’m confused regarding the requested fuel grade on the aggressive map as it states 93, Is this equivalent to our Shell V power / Tesco Momentum (99) or are we talking proper race gas required for the aggressive map?

93/94 Octane rating we need to use RON 98/99 like Tesco 99 or V Power

If you want to run race fuel the VP MS109 or similar is available in drums

[335i E92]

Originally Posted by neil@JuicedUpTuning

93/94 Octane rating we need to use RON 98/99 like Tesco 99 or V Power

If you want to run race fuel the VP MS109 or similar is available in drums

[335i E92]

Just had the below response from Cobb. Looking at the dyno results in the link I was pretty surprised how low the BHP figure was for stage 2+ FMIC aggressive was, only around 360. Does this seem correct, would have expected over 400 horses?

===============================================

Unfortunately there is no exact boost levels as your vehicle runs a load based system. Here are 3 map comparison on our dyno: 335i Stage 2 Map Comparision.

http://accessecu.com/dyno/graph.php?...rgb3=000153000

Boost will change depending on the load.

Please let me know if you have any other questions or concerns that I can assist you with.

[phil200tdi]

It will be wheel horse power. Add 10-15% for bhp correction.

[Alpina_B3_Lux]

Originally Posted by 335i E92

Just had the below response from Cobb. Looking at the dyno results in the link I was pretty surprised how low the BHP figure was for stage 2+ FMIC aggressive was, only around 360. Does this seem correct, would have expected over 400 horses?

Mate, that's not a crank figure, that's a whp (wheel horse power) figure. I think it's quite accurate for the stage 2+ remap, as that is more or less what I got out of my GIAC stage 2 remap as well. In the US it's all about whp, they almost never mention the power at the crank (i.e. after drivetrain losses and corrections pursuant to the prevalent DIN norms).

That should equate to around 430hp at the crank, if my dyno figures are to be taken as an example.

Alpina_B3_Lux

[phil200tdi]

Also temps are high at 91 Fahrenheit, could be humid too which will sap power.

[335i E92]

Ok, makes sense now!!

Still by the dyno it's indicating that boost on the aggressive map peaks at 18psi around 4k rpm but dips backs down almost immediately an tapers off towards 12 by 6k rpms.

Obviously any tune will shorten the life span of the turbo’s but is this considered a plausible boost target (even if a brief spike) for stock turbo’s and FBO’s? I won’t be tracking the car so it would only see these levels of boost for short burst whenever I feel like embarrassing an RS4 or similar.

[ciomas]

Originally Posted by Alpina_B3_Lux

I had GIAC stage 2 before going over to COBB (but more due to the compatibility with bigger turbos and bespoke map development possibilities).

The COBB stage 2+FMIC aggressive felt definitely more powerful than the GIAC stage 2 (which I dynoed at 433hp / 677Nm). GIAC targeted 16.5psi, COBB goes up to 18.5psi, which explains it. Also the boost ramps up more quickly with COBB.

Hope this helps.

Alpina_B3_Lux

Damn! thats a beast you have there
Untill a turbo upgrade shows up Ill be nowhere near those numbers with the n55...