SUNNY991

ok so i called 10-15 tune shops all over country and been all over forums,,, want to do a ecu tune on my 991s

finally a place called

OE TUNING

says they can do it

$900---hunington beach---3 hour job---25 hp 28 tq to the wheel...
I dont know if i can trust him,, all the big players in the game cannot tune how is this shop

he did tell me if you dont like- 7 day return...

i have a appt wensday.... what you guys think ??

exponential

Would be a good idea if you can have an independent dyno before and after.

Please post the result here. Thank you.

SUNNY991

Ya I will deffinitly do that.

SUNNY991

Could anything go wrong / negative with this ecu upgrade?


Also let's say the gains are not that hot. And I decide to return.
Is there any thing negative with going back to original ecu? ?

RCMA991

Based on previous experience with other vehicles I am certain that once you tamper with an ECU reflash, there is no turning back. What i mean is your warranty is potentially void if the dealer looks. Even if you return the ECU to stock calibration, Porsche will know the ECU was altered at the next diagnostics check.

With that said, it's more important WHO is tuning the car than hearing of HP/TQ gains. Can the shop provide base line pull vs a tune of a 991 previously done ? I would wait if I was you until a few more shops with graphs that can back their work, surface.

Just my opinion

WCE

Unless the flash is turning up the boost on a turbo'ed car, they really can't do much. They can maybe get a few % HP by taking away the manufacturers safety margin for less than 93 octane fuel, probably not a noticeable change at all.
I got an Audi-forum recommended APR tune for my TTS which supposedly bumped the boost from an already high 17 to a what sounded dangerously high 21 PSI and would result in about 20% more power (310ish in that car). IMO even in that situation the performance difference was barely noticable and I wan't entirely convinced it was worth my $600! With no boost gauge or dyno runs, I couldn't prove anything but I bet I only actually got a couple of extra PSI of boost to prevent blowing the hoses off!
Oh yes, and I went into this knowing Audi absolutely could detect the ECU had been reflashed (even if reversed) and I was putting my warranty in jeopardy - not something I'd do with the Porsche.

kyrocks

Not worth it.

chuckbdc

You are better off installing anti-virus software.

SM_ATL

I would wait until a reputable tuner has a proven and tested ECU for the 991S. I would not like to be the guinea pig of a shop that does not have a solid track record for a few more hp's.
Wait until someone like Evolution Motorsports (just one among other good tuners) has a flash.

Just my 2 cents...

Joe S.

Yes, you will void your warranty.

pfijcali

Don't do it. Too risky.

StirlingMoss

Why?

Mike in CA

I would definitely pass on doing this.....

teebo2345

Pass, I wouldn't want to void my warranty for an extra 4 HP. I mean you get more than that by adding the ducktail.

adamsclubs

It is a matter of cost/benefit and risk/return.

First I want to point out, the chance of a major powertrain repair in the warranty period is not that great, if the tune is proven. Secondly, even if powertrain warranty repair happens, the manufacture must demonstrate the repair is the result of the tune in order to legally deny the service. Having said that, we know manufactures do try to deny service with a tune, it can be a hassle.

People tend to warn against a tune under the pretense that a warranty repair is inevitable, and it is also inevitable the manufacture will deny the service if a tune is detected. In reality, it is a rare occasion for these two things to both happen during the warranty period.

So you are taking a risk, just need to find out your level of tolerance to the risk, and see if the reward is worth such risk. For the n/a engines we are working with, the benefit/reward of an aftermarket tune is very limited. With such a limited benefit, I don't think the risk is worth it, even though the risk is not as great as people want to believe.