Pinging 964

[nomiahmad]

Hello,

I have recently purchase a 1991 964 C2 Tiptronic Cabriolet from Victory Motor cars (www.victorymotorcars.com) and had the car shipped to Dubai. Clean car, 48k miles, looked great and drove great. But the 247 hp was not good enough for me so I started to look around for upgrade packages.

Came across a company called FVD and ordered from them the chip, the air-intake box, sport cat, and exhaust by pass. FVD promises that the combination should give 50 hp. It probably does - the car is faster, and seems to have a superior torque curve, and sounds fantastic.

http://shop.fvd.de/de/en/Porsche-0/964-11/-/-/item/item_details/VID_4810192-VCD_49615322-gid_34-sort_3-display_5-item_FVD11004/ENGINE-Tuning-TuningKits-FVD11004-LB2-performance-kit--%26quot%3BStreet%26quot%3B%2C-964-89-94.html

But it pings now! Somewhere between 2000 and 3000 rpm, under medium load, the car pings. If I gun it, it goes away, but on low/medium load it pings. And that is obviously NOT GOOD. The higher the ambient temperature (and the warmer the engine), the more pinging, again always in the same rpm load range. Of course, prior to the upgrade, there was NO pinging - and as the timing has been untouched, I am certain that is either because of the intake box or the chip. And claims that their chip only remaps the fuel map - has nothing to do with timing.

What can be the cause of the pinging? Can it be the chip? Can it be the air temperature sensor or the air flow meter from the FVD box?

Any advise would be most appreciated. I have been driving the car like a granny in order to not ahve it ping - you all know how painful it is not to drive a 911 like it is meant to be driven!

Cheers,

Nomi Ahmad
Dubai

[davisriley]

Check the distributor belt. When mine broke, it pinged a lot. Unfortunatly I don't know a whole lot about the modifications that you have done, so can't be any help there. Car looks great, love the color. Good luck.

[tshih]

After the distributor belt try upping the octane of the gas you use. (Maybe the FVD mods require 100 octane race gas).

[e=mc2]

Originally Posted by davisriley

check the distributor belt. When mine broke, it pinged a lot. Unfortunatly i don't know a whole lot about the modifications that you have done, so can't be any help there. Car looks great, love the color. Good luck.

+1 distributor belt

[Scooter]

Some chips are designed to run on 93 octane fuel. I know my old Autoauthority chip was. I used to put a splash of ~102 octane in to boost the 92 that was available in Washington State. The pinging would go away with the higher octane.

[Steve W]

I am pretty certain your pinging is coming from your chip. I have never seen a FVD chip, or any chip for that matter that never touched the ignition timing. Fueling changes, if any, are typically richer than stock and that should only help to further suppress knocking. To get a clue, reinstall your stock chip, and if it goes away, that will confirm excessive ignition advance in the chip.

[911JC911]

On the site it states:

Requires 98 Octane in Europe
Requires 93 Octane in the U.S.

Are you using the right fuel?

[tshih]

So what's the response from the OP? Would be nice to hear what the solution turns out to be!!! Is it bad gas in Dubai or bad chip?

[nomiahmad]

Guys,

Thanks for the all the input. It seems that gas quality in Dubai is good, and the issue was with the FVD chip. In hot conditions, with the engine running hot, it was the chip. Alex Renner (of Alex Renner Motors), who is the dealer for FVD got another chip from Germany which apparently sends lesser fuel in the lower RPMs. The result is that the pinging has dropped but it marginally still there. Of course, we have not really had very hot days this week so I am awaiting 100F weather and see where we stand. If it continues, I am going back to the old air box and the stock chip. Maybe it would be time to put a call into Steve Wong who seems to have had good followers out there.

Then will come the sticky issue of the refund from FVD....