Like the title says, i have a T78 turbo ,a large ported motor and all the nescecery mods ( i think)but when on full boost looses spark and the knock goes wild, (i quess this) already costed me one apex seals. Now i´ve rebuilded my motor but when we tried to tune it we could nt adjust the spark.Tuner said that it might be a shortcut in the engines harness....please help ,any one had any similar problem

 

Do you have stock ignition still? If you do you're getting ignition breakup.

 

Ok.. and what should i do?

 

Breakup that pops engines?

What kind of EMS are you running?

 

If you're really getting ignition break-up, you just need an ingition amp, just do a search for "ignition amplifier", "twin power", or "jacobs" and you should find a bunch of posts. Also, ironically, you asked about this a few months ago :

https://www.rx7club.com/showthread.p...tion+amplifier

Though, I agree with classicauto, it seems wierd that a ignition miss would mess up your engine. I would think you generally blow an engine when you get ignition before you want to, not if you simply aren't getting inition.

- Andy

 

Since nothing else seemed wrong ,I quess that this is the reason for the blown engine!
Please explain what is EMS..this is a technical tearm and ....you know i speak Greek

 

Like you said,ironi like a bad joke that costs thousents of $.Since the single conversion and tuning costed me 13000$ and i only had 2000 miles , this was covered by the Garage quarantee.Any way the engine was rebuild again and 2000 miles after when i went to tune the car(my location and tuners are 500 miles apart )he said that during the tuning the car was producing heavily knock numbers ,he was experiencing spark loss and could nt adjust the ignition advance, said that a shortcut in the engines harness might be causing this and would try to make time to check the car after the holydays,so i returned home and after spending a tone of money on this car i have it seating in my garage .If you make anything of this story please let me know.

 

He was getting knock and couldn't advance the timing... Somethings the matter there! EMS = Engine Management System aka Standalone. A leading ignition amp I would do at the minimum where you're at.

 

Put a jacobs on the leading.

 

Yes thats what the tuner said,as for EMS i use a Power Fc and today i ordered an HKS twin power amplifier, should i buy coils too?Do you think there is a chance a shortcut in the harness might be causing this ?and if so should nt there be some other symptom?

 

you could switch the leading coil to one from an FC. ignition break up can harm these engines.. it doesn't always have to be auto ignition

 

Get a PFC, and HKS ignition.

 

What are your power goals? Honestly I would never ever use the HKS twinpower as its only a re-strike. If you're going to do anything at least a get a Multiple Spark Discharge unit.

 

At last dyno the car made a bit more than 500 and iwas pretty huppy with it ,my only concern is to make them safe so that i can enjoy my car.Can you saggest any Multiple Spark Discharge unit,and why you find twin power so useless.

 

As I stated the HKS is only a "re-strike" system. Any msd unit will be much more beneficial to you. The only limit is your funding. I ran 3 msd boxes with MSD blaster coils, and a MSD twin post coil for the leading.

 

Knowing that i've spended more than 40k on upgrades I would say that funding is not a problem and anything less than the best part is not an option.For you to know ,i am really fed up with the so called tuners and mechanics over here so i've made arrangements to have Steve Kan flown over to tune my car on February.By then i need to have the car running perfectly, so could you please give me the tech details for this parts or point me to the seller!I know that i'm asking too much but since i like doing most things my self , wiring info would be much appreciated !

 

Here's where I'd start:

https://www.rx7club.com/rotary-drag-racing-167/msd6a-msd6al-2nd-gen-coils-spark-plugs-689629/

That is the minimum you'd want to upgrade at this point. This will allow an actual BOOST in charge voltage. The HKS system simply re-fires at the original voltage......boosting duration of the spark, but not its actual power/arc.

You can go further and add boxes for each coil, and run individual coils like an MSD blaster such as the SS - http://www.msdignition.com/coil_blaster_6_8207.htm

 

I´ll start with MSDs and Blasters and see what happens.Lets hope they ship worldwide! Thanks a lot guys !

 

I'll send you a pm later with some details to the kits I make and install.

 

Back to the begining, are you getting ignition breakups? If so, try MSDs. I have the HKS TP, it does some work, but I guess you are aiming higher than I, so you must get something stronger.

But, are you getting ignition breakups?