lol .. Title, Y U No Change ?!!! Just edited but not changed ..

Anyhow , just thinking of upgrading my ignition system to after market ignition coils or HKS twin power DLI , but car is stroked to 4.1 and is running with high compression pistons rated @ 12:1.

Now problem is .. I'm running a 95 pump gas which is barely enough to feed my 12:1 pistons before it detonates due to the lack of higher octane. Now, with this concept.. Don't you think that this upgrade wud conflict with my built ? wouldn't that lead to retard the timing more and more ? Think about it .. Amplifying ignition + low octane + high compression pistons ?! Not a good combination, right ?!

Note : i'm considering this cuz my OEM coils seem to be exhausted, so good reason to swap for aftermarket's.

 

I'm no expert but i think you should be fine nothing a tune can't fix once you put them in.

 

Thx for passing by .. But i don't think it's a matter of tuning , even with tuning i won't be able to advance the timing due to the lack of enough octane .. So not sure what wud happen if i amplify the ignition even more with these things ..

 

How did you arrive to the conclusion that your OEM Coils seem "exhausted"?

I also don't understand why you would go with 12:1 pistons when you only have access to 95 octane, but that's a different discussion.

 

Car struggles on start up, yes it cud be a fuel pump, crank sensor, weak battery, plugs ... etc , lets just say coils, i luv coils i dunno .. if you don't mind Lets just focus on the point i'm trying to find out here, So what do u think Sam ?! Yes OEM coils are great but i'm just trying to find out whether my point is correct or not .. Lets just focus on that plz !

As for the pistons, with some crazy calibration internals components that my installer calculated and suggested , i said ok on them and they did work after all, howz that ? I don't know .. This crazy fella been modifying VQs and stroking them out since years ..

Now lets focus on my thread plz , i'm discussing some particular point so i'm expecting answers on that only, thank you

 

Then why'd you start this thread? If your motive to making a purchase is emotional, then we really have nothing to add. Go for it and let us know how it goes You've already PM'ed and I told you my opinion.

Since he's such a VQ Pro, did you ask for his opinion on upgraded coils? I'm curious as to what he would say.

Ignition is not the weak link here, it's your fuel.

 

x2

Amplifying your spark will not do anything to reduce detonation. I've used HKS DLI on other motors (EJ25, 4G63), and its pretty useless anyways (never solved issues of weak spark in high HP applications). Det is only solved with higher octane and/or lower combustion temps/pressure - which can be achieved multiple ways.

One thing you *could* try, if you are SURE you have detonation, that is relatively cheap, go a step or two colder with your plugs, its not going to help with this mysterious "hard start" you mentioned (unless the plugs you currently have are shot), but better heat dissipation with colder plugs helps reduce a potential hot spot inside your combustion chamber.

Also, in regards to timing advance -- With your build, you increased the VE of the engine, all other things equal, you wont need as much timing advance to make power compared to stock VE.

And after all that, you still have to have the octane to handle the higher static cylinder pressures of your motor, 95 might not be enough.

my .02

 

Now i just wanted to see someone approving and agreeing on what i discussed above, so these won't help after all.

Thx for sharing ..

 

No problem. Just MY personal experiences. HKS markets their products well and the folks that sell that stuff turn a profit, so I'm sure some people will disagree with what I said.

 

hahaha right ..
Anyways, car is running like a champ , It's just i wanna make sure that engine is running in safe, no complain of performance whatsoever ..

Colder plugs sparked my interest tho