Lt10s x4 + ice 16v booster
 

Hi there i am wanting to know if you can help me out with my ICE 16v Ignition booster to a microtech LT10S with X4
I have a Rx7 S4 running a 13B bridgeport turbo that is ran buy a microtech LT10S and a x4 ignition box and bosch coils.
Now i brought a Ice "Ignition output booster" that does not have a part number on it and my electircian came over to wire it in and he said i can not run this setup as it says in the instructions "not designed for multiple coils"
Is this correct if not how do i hook this up to a microtech LT10s
My Ice has 3 wires coming out of the black box
1) black
2)orange
3)red
On the instructions it has directions for cdi(msd) ignition or HEI ignition

I wrote to Ice ignitions and this is what they replyed with

"You should have a main power wire that feeds the 4 coils. This needs to be cut and fed into the red wire of the booster, with the orange wire going out to the other side of the cut wire. (ie: power in - 12v and power out - 16v). Black wire to earth"
"At least someone read the instructions - they can be used in this application as only one coil should be working at any one time"

would this be right?

call microtech efi and ask them before making a mistake

i have the same ice boosters and i had to run two of them cause i was running two coils as wastespark from BIMs

you will be OK cause in a sequential fire rotary with 4 coils then the total load on the unit per rpm is same as any 4 cyl single coil disributed spark
i would think though that there may not be cycle period bewteen leading and trailing sparks so i would recommend you wire only the leading to be 16v till you get another ICE booster unit

you and the tuner /builder need to be aware of the physics involved in using the 16v and what that means on the components
the 16 v system allows the HEI coils to get to full saturation with a shorter dwell period than could be achieved with 13.5v
ie,, in a two coil dizzy or wastespark leading FC/FD coil there is only 3.33 ms between ignition events when at 9000 rpm
( sequential fire 4 coil rotary will be still at 6.66 ms )

your average HEC ignition coil uses an average 3.5 ms at 13.5 V to achieve 7A of current draw
as you can see,, at 9000 and higher rpm,, spark will fall off from 7A ,,,and in some ported engines that may well be when you need it most


the 16v ( in this wastespark example ) allows the coils to charge to 7A in only 2.9 ms
and thus lifts the rpm limit in which that 7A can be achieved

HOWEVER

at the nominal 3.5 ms that your average smart BIM ignitier strives for ( those with dizzy DFI )
or at the average 3.5 ms dwell setting on a sequential microtech
then 16v becomes 9A of load
the spark is very fat for a boosted application
BUT
on extended runs , for the coil or BIM or even x4 IGBT driver ,, then destruction due to heat overload is imminent
( i killed a module ,, bigger badder heatsinks required in my case )

and hence use the booster for this ( 3.5 ms ) dwell period only if doing quarter mile runs

IE

in the sequential ignition LT10S,, you can adjust the ignition fixed dwell period

you can choose to leave it at 3.5 ms ( most are set 3.25-4.0 ms )
and then keep the run time to a minimum
but so keep the fat as 9A to light the h20 wet high boost mix , 1/4 mile at a time
( and have a very long spark duration,, unlike the CD ignition )

or
you can turn the dwell down to 2.9 ms ,, and thus race around the circuit for 80 laps with no fear of overloading the ignition components
- but having a 7A spark up to that 10500 rpm rev limit ( with that long / large angle spark duration )