savyboy

2009 997.2 C4S PDK w/S PASM

Previously I posted (https://rennlist.com/forums/997-foru...ght=brombacher) that I installed the FVD Brombacher full exhaust with headers, 200 cell cats and side mufflers.

The sound improvement was immediately apparant. The butt dyno said there was a good power increase across the powerband. Dynolicious confirmed this across 4 before/after runs.

About two weeks ago I received the new FVD ECU flash cable and software. Info on their web page http://www.fvd.de/us/en/Porsche-0/99...t-Load%29.html

I used the cable and Durametric software to easily read and clear my existing CEL, and then using the easy FVD software I downloaded my OE map to my laptop and uploaded it to their server.

The next day I was emailed my OE map and a new tuned map based upon my specific car and mods. I uploaded this to my ECU again using the FVD cable. So easy.

Since then I have been letting the new mapping adapt and settle in. Today I had an ambient within 5 degress of previous Dynolicious runs. So I did two more runs to document the ECU flash on top of the exhaust.

They confirmed my butt dyno and actually exceeded FVD's claims-

FVD publishes a dyno sheet showing max gains for the combined system of +38hp and +29lbft TQ. I actually came up with a greater HP gain (44), and the Launch Control start used for testing was this time just plain vicious.

Bottom line, I am very happy with the results from the full FVD/Brombacher exhaust system and ECU flash. The sound is quiet but rumble-y when driving gently, and transforms to a howling wail upon WOT and rising RPM's. A perfect Jeckyl/Hyde which is right for me.

I have had no CEL since the flash. The flash also altered and removed 90% of the cold start "loud" exhaust that I mentioned in my previous post. Any time I would want to revert back to my OE flash I can easily do it. Butt dyno says drivability under any condition is excellent.

If you are shopping for a 997.2 full system, I can recommend the FVD Brombacher with full enthusiasm. I am very happy and would not want to have to revert back to stock.

964C4

Thanks for the info !

Do you know the size of FVD's file ? As I've read, 1MB is more creditable than 128KB

Will it be erased at the dealer if they do an update to your car ? GIAC says it can happen to their program...

hoffa

128Kb is a lot of assembly code. 1Mb vs 128mb is a moot point.

964C4

Hmmm... I do not think so

But please, justify your point

hoffa

I guess based on my experience developing network hardware, the amount of microcode to do something extremely complex is relatively small.

in a couple hundred kilobytes of raw microcode you can acheive a tremendous amount.

SO the size of the actual file is irrelevant. How big is the Porsche ECU? How big is that flash chip? Is the 1Mb got a lot of extra meta data in it?

Is the 128kb updating only a portion of the ECU (a diff)? vs a complete reflash?

More code doesnt mean its better My point is, the size shouldn't dictate the quality. The dyno results should.

savyboy

The original and tuned files are both 4MB, so I guess 4 times as credible

Don't think they can get overwritten, but if so, who cares? I can re-load.

The new file is invisible to Porsch's PIWIS tool.

964C4

Thanks for your replies, you 2 !

I asked my questions, because:

- SOFTRONIC says their file is 1MB as opposed to 128KB from other companies. - My tuner, who is highly experienced with chip tuning, says that flashing through the OBD port is not the real way of modifying the ECU. He says, the loaded file goes like on top of the OE file... So, a 128KB file is "lighter" and a 1MB file could be heavier...

- Loosing the tuned file if dealer puts updates: I understand that at any time I can flash back the tuned file, but how do I know if the update erased my tuning ? Maybe with "real" chip tuning (sending the ECU to the tuner, instead of flashing with a cable through the OBD port) the tuning is more solid

Again, I am not a pro, but I've read a lot and just post here what I've found. If I am wrong, please educate me

savyboy

I mean no disrespect- but in my mind your are overthinking the issue.

To me the FVD Brombacher ECU Flash=

1. Years in the business,
2. Porsche specialist
3. Equipts a lot of Porsche race cars
4. Simple program to use
5. Superb customer service
6. I get DuraMetric functionality too

It was a no-brainer for me, and I waited for this to come out from FVD.

964C4

Fully agreed !

savyboy

Mother

Great the car performs better FVD engineers are great at what they do and use them for my Custom SC work. I have a 2000 C2 and my stock map is 1,025 KB in size and adjusted maps are of same size also just the parameters are changed to suit the hardware I have installed.

RollingArt

Great feedback thread for FVD products.

Good info.

Thanks much.



Phil

Rhonda@FVD

Savyboy,

Great write up. Glad you are enjoying our products.

Rhonda

JSeven

So Porsche needs to open the engine and put new cams, new exhaust system, new intake , new ECU and other minor mods and still only gets 28Hp with their X51 option, they were the ones who build this engine.

And FVD with new exhaust system and ECU gets 44Hp

I know FDV is a very old Porsche tuner, but please, do you really believe your car is making 44hp more?????????????? If thatīs make you happy thatīs cool, but doesnīt give much credibility to your knowledge.

J.Seven

docjohnM

I really couldn't care one way or the other...my car is stock, but did you even read the OP blurb??? They replaced the cats too. Do you think porsche would refrain from selling 997.2s in certain states with stringent smog laws??? Did you know that porsche has to pass DIN standards for noise? Without replacing the cats, most exhausts make 10hp......