Boosted11

iTrader: (11)

I just purchased a used ltx8s. So I started researching some more on what has to be done to get this in the car. I read that bosch coils was necessary. I pmed rx72c, and he said that yes the bosch coils you MUST have installed. The seller for the micro said that he ran on stock coils as well as the previous owner before that.

Now..... Is it absolutely necessary? I would like to run stock coils. As i'm only running 300whp on a bnr stage 2, so don't really need better coils.

rx72c

iTrader: (8)

lol

RotaryEvolution

iTrader: (30)

nm

sngl13b

iTrader: (16)

i have the same on my fd and i'm using t2 trailing coils and it works perfect,and i think there better than the bosch one.i'd put 4 trailing ones on it,and make sure the dwell is set at 3.00,jordan

rx72c

iTrader: (8)

The above is a good idea and does work.

ronbros3

I run 4 Crane 92s with my LTX8 been 6yrs. no probs.

Boosted11

iTrader: (11)

I've been so lost with this ltx8s setup.

rx72c

iTrader: (8)

Well their you go. Thats an option as well.

Boosted11

iTrader: (11)

By 4 trailing coils, you mean 2 packs right?

And, the dwell being at 3.00 is correct? 100%?


While we're at it.... Is there anywhere to buy these bosh coils in N.A? I've searched on google, with no luck.

rx72c

iTrader: (8)

Put dwell on 4 ms with the mazda trailing coil packs.

Boosted11

iTrader: (11)

Thanks mang. Probly come back to this when the microtech is in and preparing for setup.

Trots*88TII-AE*

iTrader: (11)

what's the max safe dwell you can use on wastespark TII leading coils? And what characteristics make a coil compatible with the Microtech, I read that some cannot be used and don't understand why.

bumpstart

6.66 ms avail per combustion event at 9000 rpm
,, in which wasted spark must charge and fire twice

leaving some period to fire,, then dwells above 3.0 ms would soon become prohibitive

default for wasted spark setup is usually 3.25 ms,, and as such microtech are assuming your not going much beyond 8500 rpms
( clearly then you can see that running dwell at 5.0ms on SEQUENTIAL ECU's leaves laydown periods for the coil beyond 9000 rpms )

as for coil compatabilties
the MT / LT series has no internal igniter or external box ,, runs wastespark leading and uses stock coils
( in series4 mode it will toggle the trailing coil like mazda )
note its using the mazda igniters,, and also the ballast resister found in the leading coil pack to ballast this ULTRA low resistance coil to 0.9 ohms

the MTX/LTX series has internal igniters,, NLA from microtech
but does run fully sequential ( 4 individual ignition outputs,, not wastespark )
and these are intended to run the HEC715 coil ,, and its relatively lowish primary resistance of 0.45-0.5 ohms, once per combustion event

the LTS uses external box with IGBT transisters to run the coil,, these are renowned mainly for the rate of fail,, blamed variously on earth differentials and also subcontracted assembly
however these are like the LTX,, running individual 0.45 ohm HEC 715 fully sequentially - ONCE per combustion event


running other branded performance coils introduces perhaps too low a resistance
and just like when you run too low a resistance in audio speaker grouping
the amplifier ( read transister igniter ) soon overheats and burns out

Trots*88TII-AE*

iTrader: (11)

Thank you very much for the detailed post. Now this may sound stupid, but if you are using a low-resistance coil (~0.15 Ohm), is it possible to run in-line resistors, or would it not make a difference? I am looking for an alternative for the stock waste-spark primary coil, I'd like to run an individual coil/rotor, but still running in waste spark mode, and have it work with a couple MSD Digital 6+ boxes.

bumpstart

in HEI mode,, then ballasting the low resistance coil with a resister
( being sure the power rating for the resister is adequate )
is the accepted norm,, and the coil can be ballasted either on the (+) or the (-) post on the coil as the coil and resister operate in series
( the mazda FC leading coil is wired either way to its base pack resister OEM,, depending on the production run )

however,, when bringing digital CDI ,, then the load seen by the coil is seen at the CDI unit,, and not by the triggering igniter

,, as such the normal igniter,, ie external x4 box or internal X model igniters
does not see the full load current as of that seen by the CDI box and its capacitor

ie,, the igniter is being used basically as triggering transister,, and the CDI box as a big high powered, capacitor loaded igniter

in this situ i cant see any issue with ultra low coils affecting the igniter longevity

be aware that some types of CDI may be trigger signal polarity sensitive and that you may have to alter trigger setting at the ECU to suit
( else the phasing may amount to a shift in timing )

swkiller

iTrader: (1)

awsome info bumpstart