Page 2 of 2

Re: Bosch spark plug failures

Posted: Sun Mar 30, 2014 9:41 pm
by loxxrider
I can agree with what Sam said... I used to get maybe 1k miles on a set of BKR7e on my Audi after going to a bigger turbo with 20+psi. The triple electrodes would get me more life, but not more than 2-3k miles usually. I used to run .028 gap on them.

Re: Bosch spark plug failures

Posted: Sun Mar 30, 2014 9:44 pm
by chaloux
A thousand miles? Wtf! Or what, they'd start missing?

That is bs, there gotta be a good fairly inexpensive plug out there... no fr5dtc local.

Re: Bosch spark plug failures

Posted: Sun Mar 30, 2014 11:12 pm
by loxxrider
Yeah, they'd miss at high boost. That is the life of a heavily boosted car I'm afraid! I didn't mind changing the plugs out at about a dollar a piece, especially when I only drove it about 1000 miles every five months or so. I'd get maybe triple that life out of the tri-electrodes, but that's it. I'm not sure if there was some kind of way I could have improved that...

My tune was very solid. Never rich. Launch control might be a factor though, I used that a lot :)

Re: Bosch spark plug failures

Posted: Mon Mar 31, 2014 10:32 am
by themagellan
chaloux wrote:A thousand miles? Wtf! Or what, they'd start missing?

That is bs, there gotta be a good fairly inexpensive plug out there... no fr5dtc local.


Chaloux run the Fr5dtc's!

I thought I couldn't find them anywhere but they are everywhere! Super cheap to boot. They are OEM for the 993 and 964 iirc. Search for "BOSCH 7403" to get better results

Any local german mechanic shop can order them from a catalog for about less than 20 CAD for all 5. They seem to be holding up for a variety of bigger power applications including a friends rs6x b5s4.

Re: Bosch spark plug failures

Posted: Mon Mar 31, 2014 12:27 pm
by audifreakjim
Anyone ever try the NGK R5671A-9 spark plug? I have a set and will probably try them. They are non-resistor so we will have to see how that works out.

http://www.efiexpress.com/catalog/produ ... cts_id=120

Re: Bosch spark plug failures

Posted: Mon Mar 31, 2014 5:46 pm
by loxxrider
themagellan wrote:
chaloux wrote:A thousand miles? Wtf! Or what, they'd start missing?

That is bs, there gotta be a good fairly inexpensive plug out there... no fr5dtc local.


Chaloux run the Fr5dtc's!

I thought I couldn't find them anywhere but they are everywhere! Super cheap to boot. They are OEM for the 993 and 964 iirc. Search for "BOSCH 7403" to get better results

Any local german mechanic shop can order them from a catalog for about less than 20 CAD for all 5. They seem to be holding up for a variety of bigger power applications including a friends rs6x b5s4.



Marc also carries them. Those are the plugs I would usually get about 3k out of. Again, that could be launch-control-influenced.

Re: Bosch spark plug failures

Posted: Mon Mar 31, 2014 6:17 pm
by EDIGREG
I get at least 5k out of FR5DTC running E85

Re: Bosch spark plug failures

Posted: Mon Mar 31, 2014 7:16 pm
by chaloux
Dad ran the fR5dtc and had good luck with them. Gonna have to check the local shops... anywhere online is fifty bucks for a set shipped to f'n Canada. Even IN Canada.

Re: Bosch spark plug failures

Posted: Mon Mar 31, 2014 7:43 pm
by pilihp2
I've had my fr5dtc's since Jan of 12. Not sure the miles but I think well over 10k. I also have a LOT less horsepower than you guys.

Re: Bosch spark plug failures

Posted: Fri Apr 04, 2014 7:06 am
by mushasho
audifreakjim wrote:Anyone ever try the NGK R5671A-9 spark plug? I have a set and will probably try them. They are non-resistor so we will have to see how that works out.

http://www.efiexpress.com/catalog/produ ... cts_id=120


So I guess I can be the first to try these and report back... I've used DTC's & BRK7e normally... And BRK7eix if available for longer life when available...

Sent from my HTC One using Tapatalk

Re: Bosch spark plug failures

Posted: Fri Apr 04, 2014 7:15 am
by Marc
audifreakjim wrote:Anyone ever try the NGK R5671A-9 spark plug? I have a set and will probably try them. They are non-resistor so we will have to see how that works out.

http://www.efiexpress.com/catalog/produ ... cts_id=120



they have resistors.

Re: Bosch spark plug failures

Posted: Tue Apr 08, 2014 10:41 am
by audifreakjim
Mark, mine say non-resistor on the box and ohm out to 0. The "R" in this case doesn't stand for resistor.

Either way, if people have run them successfully on VEMs or other standalone I am looking for feedback.

Re: Bosch spark plug failures

Posted: Wed Apr 09, 2014 10:13 am
by Marc
interesting. the spec sheet I looked up indicated resistor. I will go test one and report back.

Re: Bosch spark plug failures

Posted: Wed Apr 09, 2014 10:17 am
by Marc
you are correct, 0 ohms. which is interesting because I've used it in 2.2 I5 high horsepower stuff with good results and low noise. go figure.

Re: Bosch spark plug failures

Posted: Wed Apr 09, 2014 2:12 pm
by audifreakjim
I am going to try them out. Trying to make sure I don't introduce any bizzaar issues with electrical noise on top of all the other changes

Re: Bosch spark plug failures

Posted: Sun Apr 27, 2014 8:37 pm
by audifreakjim
Been running the 9 heat range NGK racing plugs, dropped them in with the gap as they came at .030. Did 507whp on the dyno, two track days and 0 issues. Plugs look perfect. I would always get a tiny bit of sparkles on the 7 heat range over time, no hint of even slight detonation.

I can hear a little more electrical noise on my headphones with the knock sensor hooked up but not enough to effect anything major.

Re: Bosch spark plug failures

Posted: Sun Apr 27, 2014 8:49 pm
by chaloux
audifreakjim wrote:Been running the 9 heat range NGK racing plugs, dropped them in with the gap as they came at .030. Did 507whp on the dyno, two track days and 0 issues. Plugs look perfect. I would always get a tiny bit of sparkles on the 7 heat range over time, no hint of even slight detonation.

I can hear a little more electrical noise on my headphones with the knock sensor hooked up but not enough to effect anything major.


Great news Jim!

NOW WHERE ARE THE VIDS!?!?!??!?!

Re: Bosch spark plug failures

Posted: Sun Apr 27, 2014 9:41 pm
by Mcstiff
Dyno:
https://www.facebook.com/photo.php?v=481204908671695

:hide:

Track:

[youtube]https://www.youtube.com/watch?v=IGKouhqsd6M[/youtube]

Re: Bosch spark plug failures

Posted: Sun Apr 27, 2014 10:18 pm
by audifreakjim
Yeah, I have turned into that guy who only puts things on Facebook. I will try and update my thread tomorrow.

Re: Bosch spark plug failures

Posted: Mon May 05, 2014 2:18 pm
by Audilard
chaloux wrote:
audifreakjim wrote:Been running the 9 heat range NGK racing plugs, dropped them in with the gap as they came at .030. Did 507whp on the dyno, two track days and 0 issues. Plugs look perfect. I would always get a tiny bit of sparkles on the 7 heat range over time, no hint of even slight detonation.

I can hear a little more electrical noise on my headphones with the knock sensor hooked up but not enough to effect anything major.


Great news Jim!

NOW WHERE ARE THE VIDS!?!?!??!?!


I'm curious to try these in my car with E85. I seem to be wearing out the bosch plugs rather quickly.