75 TS sparkplugs

[GTVeloce]

Has anyone tried the FR6DC plugs in the TS? I am currently running the FR5DC and am curious after MD's comment about them being possibly too cold. My 75 sees a lot of city traffic as a daily driver. I haven't noticed any real problems as yet but if the 6 might run better I'd consider swapping them.

[MD]

The FR5DC makes a cold engine more likely to misfire, take longer to warm up and a tendency to be sluggish until it comes to full temp. To get hot enough it likes to see a lot of 6K rpms and once there, the engine runs well and clean.

A warmer plug will make the engine behave much better sooner and run more consistent (Unless it sees a lot of 6k rpm every gear change in which case you need the 5's  - essentially track work)

[Joe Falcone]

I'm running the 5s for everyday and track. Always goes well.

[AikenDrum105]

The French made Beru plugs turned up - they're not platinum obviously    

[AikenDrum105]

The Denso plugs arrived - these are Iridium with a v-grooved lateral electrode.

also a pic of the COP units

Cheers,

[GTVeloce]

Scott, please give us your thoughts as to which plug runs better and for what usage (fast road, city traffic etc).

Also, what does COP mean? Clip-on plug?

Thanks
Julian

[AikenDrum105]

Once I get the Coil On Plug units wired up,  and stop playing with the tuning maps I might try running each type for a week and see how they look afterwards.  I expect I won't feel a difference between any of them performance wise     The engine was recently rebuilt, runs clean,  and the fuelling is pretty well controlled by the MegaSquirt - so fouling / cold starting (which often can be the deciding factor on a plug) shouldn't be too big a deal.

So the COP units remove the need for High Tension leads all over the engine bay - you end up with a COP on top of each plug (8 for the TS)   and a small low voltage wiring loom running between them all to power them.   Main benefit is removing the HT leads, and a slightly tidier install.  Don't expect a real performance benefit from the COP either

[Craig_m67]

How tall are the COPs fitted, short enough to get under the middle blanking plate?
I remember find some ody who was using some VAG Polo I think ones, however they we're pretty tall.

[AikenDrum105]

I think the Denso 4150 COPs can be squeezed under the plate - I'll find out shortly    I wasn't planning to run with the cover plate - but the COP units need some form of support at the top - sqooshing em in with that plate might be just the ticket.     (but then you can't see them....    ) 

[75TS]

Hi all, I have the original golden lodges for sale if anyone wants to purchase, not asking the earth, just a fair price, pm me please if interested, TA

[AikenDrum105]

A little update on this - for those who were interested here's a couple of pics of the Denso 4150 COPs fitted -  they are about 5mm too high to allow the cover plate to screw down tight - but I think you could space the cover plate up on its screws and it would look fine if you wanted to.    You can see from the side pic that they sit pretty much level with the top of the camshaft cover.

Personally think it looks better with them exposed    

Haven't actually run the car on the COPS yet - this was just to get the measurements right for the loom I had to make - hope to get them running this weekend.      I have been running the Denso plugs though (on the wasted spark coilpacks)  and haven't had any issues with starting or any perceived performance difference compared to the NGK Iridiums  - and the plug colour is good (probably more due to the finer mixture control of the MS ECU + Wideband O2 sensor than the plugs)


Cheers,

[AikenDrum105]

In case you're interested in the (open air)  spark pattern of those Beru plugs,  I hooked them up last night while testing the COP setup.    Interesting to see it using all four of the tangs - I always thought that manufacturing tolerances would have one just a smidge closer that would catch all the spark until it wore down a little.....