Nissan GTR R35 coils on link G4

[Ian Fenech]

Hi all, looking to upgrade from honda K series coils to Nissan GTR R35 coils.

 

Anyone used these and maybe has setup for falling/rising and/or dwell times please?

 

Thanks

Ian

[Adamw]

Spark edge is falling.  

Try this for dwell: https://www.platinumracingproducts.com/pages/platinum-racing-products-r35-dwell-settings

[Ian Fenech]

Thanks AdamW, I was wondering if someone used these before and see if they were an upgrade regarding spark.

Thanks again 

 

[Adamw]

Depends what you are comparing them to I guess.  But they are probably one of the more powerful OEM COP coils that I have come across.  Make sure you get genuine Hitachi ones or some other known reputable equivalent.  Avoid Amazon/ebay etc.

[Ian Fenech]

Thanks for your reply. Will go for original Hitachi.

We currently have no problem with the denso K series coils but we're trying for more power out of our 4cyl Cosworth 2.0l, currently running approx 1250hp and I think the coils will max out at more boost. That's why we are currently trying to find better output COP.

 

 

[Adamw]

Lol, that's a little more than I was assuming.   That's getting up there for sure, you might be pushing your luck even with R35 coils at more than 300Hp/cyl.  Although im quite surprised the K series coil actually made it to that power level already.  Are you running a 16V system?  I assume now we are talking methanol, a very fat mixture and 50psi+.  I would be leaning more towards an IGN1A for an application like that, as it would give you a bit more headroom for when things arent perfect - ie mixture goes a bit too rich or battery voltage drops etc.    

I wouldnt put complete trust in the accuracy of the test results from PRP below but the general trend shown seems to fit with what I observe in everyday use.  I would put the K20 denso somewhere between around number 8-12 in this list.  

 

[Ian Fenech]

Yes, you are spot on haha!! 

16v system which is kept charged quite good for each run, methanol and running 52psi. We are currently aiming at improving our top end  but can't afford misfires that's why we are on search for an upgrade of spark.

Here is a video of the car (White Escort mk1)☺️. 

https://youtu.be/cR08UdrmQH0

[Adamw]

Although the R35 coils would still be a significant upgrade over the K20 coils, I think I would be leaning more towards the IGN1A as its just so powerful compared to everything else.

There is an issue with the IGN1A in this situation however that you need to know of - that is they have an 18V clamping diode inside them.  This means if battery voltage ever goes above 18V when the ignition switch is on the coils start pulling high current through the 12V pin and can blow fuses or melt wires etc.  Since you have a total loss system it should be fine to run like that, but you do need to be careful for example to never turn the ign switch on when the battery charger is on.   Many promod guys use these coils successfully with 16V systems knowing of this limitation.

Also be aware when running coils like these capable of generating such high energy the potential for spark leakage becomes high so you need to take all precautions to prevent this.  With a dohc engine especially you have spark plugs down inside a conductive "well" so the spark really wants to jump out the side of the spark plug boot rather than jump the gap inside the high-pressure cylinder.  With the IGN1A you need nice long spark plug boots that fit the spark plug tightly and extend all the way down the porcelain.  At the coil end you want boots that extend down the coil tower as much as poss.  Generous application of dielectric grease inside the boots at both ends.