[rooringhusky]

Originally Posted by crypticc

Have manual stg1 aggressive, MT and still 'surges' so it's not a AT thing, or a stage 2 thing.
(strictly speaking it feels like DTC is intervening at around 3k to 4k and then lets the car get the full beans)

Chris

This is the best description of how it feels...It feels like the the car bogs down in that 3-4k rpm range and then boom the power comes hard and strong really fast..

[tscdennab]

Originally Posted by Alpina_B3_Lux

What I find interesting is that stage 2+ boosts up to 18psi even at minus 8 degrees Celsius (just tried that out last night).

I always thought the DME was working with load targets and that these would mean that at colder temperatures the boost would be lower as well (colder air equals denser air). However it seems that such is not the case here.

Alpina_B3_Lux

How do you like the Cobb compared to GIAC S2 ? Any initial impressions ?

Thanks !

[Alpina_B3_Lux]

Originally Posted by tscdennab

How do you like the Cobb compared to GIAC S2 ? Any initial impressions ?

Thanks !

It's a bit early to say anything definite, because I've only driven the COBB for a few miles and had the GIAC stage 2 for more than a year.

So far I do like the COBB, the stage 2+FMIC aggressive that I'm driving right now feels quite a bit more powerful. Boost is higher too, 18psi compared to 16psi, so that's not a big surprise. Sound is slightly different, with COBB it seems more throaty, raspier which is probably due to the different vanos programming.

GIAC was smoother though, I also seem to have that so-called "vtec effect" where the torque seems to be launched in stages and not in a smooth line. This can however also be partly due to my slipping clutch, and COBB seems to be aware of the problem and working on it.

If I were to keep my stock turbos, I would not have changed from GIAC to COBB as I was very satisfied with the GIAC stage 2 flash and it worked very well. But as I'll have the RB turbos installed next week, there was no choice as the GIAC flash does not work with them.

Alpina_B3_Lux

[rader1]

Originally Posted by Alpina_B3_Lux

What I find interesting is that stage 2+ boosts up to 18psi even at minus 8 degrees Celsius (just tried that out last night).

I always thought the DME was working with load targets and that these would mean that at colder temperatures the boost would be lower as well (colder air equals denser air). However it seems that such is not the case here.

Alpina_B3_Lux

With stage 2+ it works more like a boost targeting system, they do it with the big horsepower Mazda speeds aswell.

[1faste903series]

Originally Posted by rader1

With stage 2+ it works more like a boost targeting system, they do it with the big horsepower Mazda speeds aswell.

Called them today and they told me( boost is targeted with load)

Rader, you think I should just wait for them to fix this problem people are having with the 3,to 4rpm pause ? I read somewhere else, that someone hasn't felt that deley.I'm sure not getting a jb4 or proceed anymore after doing lots of research this week.I think you pay for what you get and would rather have a Cobb for the money with a true flash.Good info on this thread too.

[rader1]

I talked to an authorized ACCESStuner yesterday about doing a custom meth map and according to them the ATP software should be available within the month

[1faste903series]

Originally Posted by rader1

I talked to an authorized ACCESStuner yesterday about doing a custom meth map and according to them the ATP software should be available within the month

There's a shop near me who has it already .I heard them talk about it when my buddy was pickin up his sti.

[rader1]

Originally Posted by 1faste903series

There's a shop near me who has it already .I heard them talk about it when my buddy was pickin up his sti.

It's available in beta release, i don't think they're supposed to tune customer cars yet. I think it's to make sure they're familiar with the software and there's no bugs.

[1faste903series]

Originally Posted by rader1

It's available in beta release, i don't think they're supposed to tune customer cars yet. I think it's to make sure they're familiar with the software and there's no bugs.

They asked me if I want to be the first to try it.I said not really .lol.Lab rat testing.

[nitehawk]

If I could gain an additional 20whp/20wtq over S2+ Aggr with ATP, I would be ecstatic. Wouldn't even bother with meth. I hope my expectations are realistic...

[tscdennab]

Originally Posted by Alpina_B3_Lux

So far I do like the COBB, the stage 2+FMIC aggressive that I'm driving right now feels quite a bit more powerful. Boost is higher too, 18psi compared to 16psi, so that's not a big surprise. Sound is slightly different, with COBB it seems more throaty, raspier which is probably due to the different vanos programming.

Thanks. Do you mean the Stage 2 + FMIC feels faster than GIAC Stage 2 Race with methanol ? Even if Cobb goes up to 18psi, the ignition advance does not go past 11 degrees as far as I see on logs, whereas GIAC goes to 14 degrees.

Do you mean the engine sounds "noisier" ? Noisy engine is not good.

But I will probably get a Cobb too if the next released maps are problem-free as far as smoothness and power.

[1faste903series]

Originally Posted by nitehawk

If I could gain an additional 20whp/20wtq over S2+ Aggr with ATP, I would be ecstatic. Wouldn't even bother with meth. I hope my expectations are realistic...

Not sure if I would want to max full gains on pump gas.If there's 20 whp left I would just leave it alone .But I would see If I could smooth things out and try to get gains in the mid range .I read that people are seeing 19 psi in the mid range and 13psi till redline .Well, I no that the stock turbos are tiny and if pushed harder till redline might cause faster failures .I think I'm ordering my a.p today

[BobS]

I sure hope they fix this surging issue. I had the same thing with the GIAC stg 2 flash and thats why I went away from it (not sure if they are related). I'm thinking of switching to Cobb but this surging issue is the only thing thats holding me back. I don't want to go through that again. It was exactly how everyone describes, between 3k and 4k ish rpm...

My car is smooth as can be with the JB4

[1faste903series]

Originally Posted by tscdennab

Thanks. Do you mean the Stage 2 + FMIC feels faster than GIAC Stage 2 Race with methanol ? Even if Cobb goes up to 18psi, the ignition advance does not go past 11 degrees as far as I see on logs, whereas GIAC goes to 14 degrees.

Do you mean the engine sounds "noisier" ? Noisy engine is not good.

But I will probably get a Cobb too if the next released maps are problem-free as far as smoothness and power.

Wow race gas and meth plus 14 degress up top.The BMW guys are power hungry .I thought the Sti and evo guys were nuts but this form top it .lol.I give alot of credit playing with these motors with no worries .

[tscdennab]

Originally Posted by BobS

I sure hope they fix this surging issue. I had the same thing with the GIAC stg 2 flash and thats why I went away from it (not sure if they are related). I'm thinking of switching to Cobb but this surging issue is the only thing thats holding me back. I don't want to go through that again. It was exactly how everyone describes, between 3k and 4k ish rpm...

My car is smooth as can be with the JB4

I would advise to wait for their new maps. From the current logs, it looks like they have a bit more work to do.

[JStang]

Originally Posted by 1faste903series

Not sure if I would want to max full gains on pump gas.If there's 20 whp left I would just leave it alone .But I would see If I could smooth things out and try to get gains in the mid range .I read that people are seeing 19 psi in the mid range and 13psi till redline .Well, I no that the stock turbos are tiny and if pushed harder till redline might cause faster failures .I think I'm ordering my a.p today

You won't regret ordering the AP. Enjoy my man!

[adidasoccer]

Is it possible that cobb could figure out how to switch maps on the fly. iv had the ap for a couple months and on the fly map switching would put the ap above and beyond anything else(imho).

[Alpina_B3_Lux]

Originally Posted by tscdennab

Thanks. Do you mean the Stage 2 + FMIC feels faster than GIAC Stage 2 Race with methanol ? Even if Cobb goes up to 18psi, the ignition advance does not go past 11 degrees as far as I see on logs, whereas GIAC goes to 14 degrees.

I rather compared it with the non-methanol map, as that's what I've been driving much more frequently.

Originally Posted by tscdennab

Do you mean the engine sounds "noisier" ? Noisy engine is not good.

The engine noise sounds different when I go WOT than with a stock car or my previous GIAC flash. I believe as mentioned that this is cause by a different vanos programming, but I believe COBB themselves may be able to shed more light on this. Also bear in mind that I have catless DPs, a sport exhaust and only 100 cell race cats left, which of course amplifies any engine noise much more than on a car that has a more or less stock exhaust system.

Alpina_B3_Lux

[BobS]

Originally Posted by tscdennab

I would advise to wait for their new maps. From the current logs, it looks like they have a bit more work to do.

Agreed....after reading shiv's explanation on PID in another thread, it makes sense to me that variances in hardware (wg stiffness, etc.) may be the reason why some people have "surging" issues or "ossilation" and other don't. Maybe ATR will allow people to smooth out the flash where a generic flash won't work properly on all cars?

I know I have a early 2007 with original turbo's so one would guess my WG's are sloppy or loose. I had surging issues and wg rattle with GIAC, I have no WG rattle or surging issues with JB4, no hardware changes what-so-ever.

[Alpina_B3_Lux]

Originally Posted by adidasoccer

Is it possible that cobb could figure out how to switch maps on the fly. iv had the ap for a couple months and on the fly map switching would put the ap above and beyond anything else(imho).

I would assume that if GIAC can do it, they would also be able to implement this.

Alpina_B3_Lux

[rader1]

Originally Posted by 1faste903series

Called them today and they told me( boost is targeted with load)

Rader, you think I should just wait for them to fix this problem people are having with the 3,to 4rpm pause ? I read somewhere else, that someone hasn't felt that deley.I'm sure not getting a jb4 or proceed anymore after doing lots of research this week.I think you pay for what you get and would rather have a Cobb for the money with a true flash.Good info on this thread too.

That's how they achieve the consistant ~18psi of boost, the DME targets the required load to meet that boost and then limit the requested load when the reported boost meets that target. It's boost targeting via load targeting lol.
Atleast that's my understanding, i could be way off.

You can order the AP and try it out and if you don't like it you can return it for a 100% refund. Why not give it a try

[Deadwrong]

I was intermittenly going into limp mode during mild acceleration, my engine was stumbling at idle, and Stg1 aggressive was running really rough on my 07 335i...I took my car in to the Dlr and found out that my car qualified for both the Hpfp and injector recalls (Received all new injectors). Now I'm running Stg1 aggressive and my car is running as smooth as silk..