No they don´t.
Backpressure isn´t changed with the resonator deleted.

Focus here is almost always on top hp/tq but rarely on the driveability,
where you are in 99% of the time...

//Peter.

 

alright cool. i'm gonna do the job in 2 weeks. march=mods march for me
i know the shop too, they're pretty good and reputable.

 

Amgen,

Can you clarify what you mean when you say "the focus here is almost always on top hp/tq, but rarely on the driveability"? And also, your comment about "where you are in 99% of the time".

Just trying to make sure I understand precisely what you are saying. Always good to get advice from someone who has had the work done.

Thanks,

 

I think hes saying theyre looking for maximum tq and hp and are willing to sacrifice your comfort of the car as a daily driver. correct me if im wrong.

 

That´s it almost;

Discussions here and on other forums are always "does it give
you more hp/tq or not". Instead you should ask "is the car more pleasant
to drive or not" (ie driveability). "Show us the diagrams before/after!!"
(That´s more difficult to prove with the driveability..)

//Peter.

 

overall peter, you would say that the flash on the c55 is worth it then?

 

Michael,

I think you may need to clarify what you are after (what is driving you to do this mod) in order for the guys who have done a flash to answer your question - "is it worth it"? I say this only by reading the responses here, because I have not done one (yet). It sounds like the flash is good in some respects and either little benefit or not so good in others.

So maybe the advice you (we all) need is for those who have done a tune to tell us where they saw the most benefit (in what driving conditions) and where they did not. Then you can weigh that against what you want and see if the benefits you will get (there will no doubt be some) provide value for what you are after.

If there is a way for you to re-title this thread (don't know if that is possible) you may get more eyeballs from the folks who have done a tune and get the information you are after. An alternative would be to start a new thread (something along the lines "need some advice from folks who have done an ECU tune on a C55" or something like that).

I'm curious to get that informed perspective as well.

 

the main thing i'm after is just more power, especially in the low end range (second gear) i'm not after it being any more comfortable to drive, i'm not sure how it could get any worse though. having a faster shifting car would also be nice (doesn't the c32 tune get you that?) and i would like to remove the top speed limiter. i think all my questions have been answered and i'm setting up an appointment for exactly two weeks.

 

I agree with mgiannetto that it would be a good idea to have a dedicated thread just for C55 ECU tuning. Who's done it? Results? Who went with what company etc...

 

I've sat back for a little while now watching the flow of the conversation, and hopefully what I can provide will be of use to you.

First off, I drive a 2005 C55 and I have had my ECU flashed (it was one of the first mods I completed on the car). And in my humble opinion it was definitely well worth it. Now to quantify that statement, I need to say that I did not pay the kind of prices that I have seen a lot of the bigger name tuners (i.e Renntech, Kleeman, etc) posting as there prices. If I had paid over $1,000 for my tune, then I may have had a different opinion (from a cost/benefit standpoint).

With that being said, I can definitely tell you that the suggestion of getting a dyno before and after is a MUST!!! My reason for saying that is, in order for you to truly evaluate what your car can already do, and what improvement the tune will provide you need to have this done. This was my one regret with getting my tune (I wish I had dyno'd first).

Now with that being said, I can tell a distinct difference in how my car handles since the tune was done.

1) The accelaration has definitely changed. It trys to fully utilize all of the power in each gear before shifting.

2) The electronic limiter has been removed, I was able to get above the electronic "155" limit.

3) I have seen an increase in my MPG (roughly 1.5 - 2MPG increase).

Now if these are things that you would value, then I would definitely push for the tune.

The other thing that I realize a lot of folks don't factor into these tunes for the C55 is that it is not as "magical" as it once was. The reason I say this is this, I don't believe the results that I gained from my ECU would have been any better going with one of the Bigger named tuners (i.e. Renntech, Kleeman, etc) than what I received. And I was able to get my tune for a fraction of their posted cost.

In addition to that, we (C55 drivers) tend to forget the fact that this software has been around for quite some time. I liken it to when you buy a software package of Microsoft Windows. Now back in 1997, you would have paid top dollar for a new version of Windows 98. But in 2011, you would be hard pressed to justify paying '97 prices for that software today. I view these C55 tunes in the same light. This software isn't brand new, so I wouldn't be paying 2007 prices today for a 2007 (at best) software patch (just my thoughts).

Bottom line: get the ECU tune (at the right price), but before you do, bite the bullet and get the dyno first (trust me you will regret it if you don't).