UK952

No spark = no go

Not an expert on plugs by any means but, with turbocharged cars running higher boost pressure you can have the spark 'blow out'. For maximum power and clean smooth running you want a good clean, hot healthy spark, which is supplied ultimately by the plugs. Wasted spark and coil on plug can help provide a better spark but you still need a plug at the end of it (that isn't going to break up and send debris through the engine) .

I have heard it reccomended to open the plug gap - so you get a better spark (more energy has to build before it will jump the gap) and from someone else to close the plug gap (spark will have longer duration as it forms sooner) so its a complex subject.
In addition, too hot a plug could cause detonation, too cold a plug will foul.

ST seemed pretty certain the NGK was the way to go, wondered if this was because he had tested a full range of plugs, because he has shares in the company or because he liked the adverts when he was a kid.
Tony

DFASTEST951

I believe ST knows what he's talking about because he's tested a lot of them. I have Champion as they were the only ones besides NGK's that were copper. The Champions were just closer to pick up. I'm just wondering as I run high boost, if I'll see or feel a difference by switching to NGK's as I already have Champions.

UK952

You probably wont notice a difference if you have no issues now, if the NGK's are the same heat range, they should be OK. However I have little experience of swapping plugs on the 944.
Tony

Hall951

Hey guys was looking for plugs for the car last night, and found
these from NGK will they work? BR7ES & BR9ES Sport there is no
P in the line what does it stand for?

Jaak Lepson

Hall951 ... see the NGK website for more info ----> NGK WEBSITE

UK952

Maybe, but it would be nice to know
Tony

vt951

I just talked to a guy at a NAPA store, and he said the BPR6ES is what NGK recommends. I can see why you high-HP guys would want a cooler plug (BPR7ES), but for my stock engine, do you think I should go with what NGK recommends?

streckfu's

I would. You won't notice a difference and have no need to run the colder plug. All things being stock, go with what they recommend. That way, if you were to have an issue (highly doubtful) they can't blame it on a non-recommended plug.

ZPmadA

My car is mostly stock except for an autothority maf. The car makes around 252 rwhp and is a 1986 944 turbo. What ngk plug and gap should I go with? Is it ok to go with the recommended for stock guys, or is the maf to much of a modification?

I forgot to ask, do 944 turbos require resistor or standard type spark plugs? I want to get plug wires from lindsey racing, but they do not have resistors at the boot. Is this how OEM plug wires come, or do OEM wires have resistors and accept both resistor and standard spark plugs?

chris951

I used to use the bosch platinums, but recently switched to NGK BPR7ES and no complaints. STAY AWAY from CHAMPION!, they are ****.

streckfu's

Standard spark plugs no resistors in the wires.

Perry 951

And you want resistors or you'll hear the ignition in the radio.

I'm still messing with my misfire, and I think it is gap related. I have the NGK's in it at .26. Missed with Champions at .26. Gonna gap smaller and see what goes.

LFA951

How good are the Bosch "Super" Copper plugs??

GaryK

I just replaced Beru Silverstone S7 with NGK BP7ES. The engine is running smoother with the NGKs, but it's not a fair comparison, as the Beru's looked well worn after 8K miles, including many track days. Neither plugs have resistors, and I'm having no problems with radio interference, using oem Beru plug wires (which I believe don't have resistors either).

Gary
'89 951

GaryK

And btw, I think Beru discontinued the Silverstone plugs anyways.