Microtech Area is for discussing Microtech systems

Microtech LTX8S w/ Bosch Coils, MUST have?

Old 01-12-10, 11:21 PM
  #1  
Pistons are gay
5 Year Member
Thread Starter
iTrader: (11)
 
Boosted11's Avatar
 
Join Date: Dec 2006
Location: Prince George, BC
Posts: 1,973
Likes: 0
Received 0 Likes on 0 Posts
LTX8S w/ Bosch Coils, MUST have?

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.
Boosted11 is offline  
Old 01-13-10, 01:53 AM
  #2  
Rotary Freak
iTrader: (8)
 
rx72c's Avatar
 
Join Date: Jun 2003
Location: Australia
Posts: 2,608
Likes: 0
Received 0 Likes on 0 Posts
lol
rx72c is offline  
Old 01-13-10, 02:15 AM
  #3  
Sharp Claws
iTrader: (30)
 
RotaryEvolution's Avatar
 
Join Date: Oct 2003
Location: Central Florida
Posts: 5,135
Likes: 0
Received 16 Likes on 15 Posts
nm
RotaryEvolution is offline  
Old 01-13-10, 04:08 AM
  #4  
Full Member
10 Year Member
iTrader: (15)
 
sngl13b's Avatar
 
Join Date: Feb 2006
Location: pennsylvania
Posts: 163
Likes: 0
Received 0 Likes on 0 Posts
PA lt8s coils

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
sngl13b is offline  
Old 01-13-10, 02:14 PM
  #5  
Rotary Freak
iTrader: (8)
 
rx72c's Avatar
 
Join Date: Jun 2003
Location: Australia
Posts: 2,608
Likes: 0
Received 0 Likes on 0 Posts
The above is a good idea and does work.
rx72c is offline  
Old 01-13-10, 06:40 PM
  #6  
Rotary Enthusiast
 
ronbros3's Avatar
 
Join Date: Jun 2004
Location: Austin TX.
Posts: 862
Received 0 Likes on 0 Posts
I run 4 Crane 92s with my LTX8 been 6yrs. no probs.
ronbros3 is offline  
Old 01-13-10, 11:07 PM
  #7  
Pistons are gay
5 Year Member
Thread Starter
iTrader: (11)
 
Boosted11's Avatar
 
Join Date: Dec 2006
Location: Prince George, BC
Posts: 1,973
Likes: 0
Received 0 Likes on 0 Posts
I've been so lost with this ltx8s setup.
Boosted11 is offline  
Old 01-14-10, 03:48 AM
  #8  
Rotary Freak
iTrader: (8)
 
rx72c's Avatar
 
Join Date: Jun 2003
Location: Australia
Posts: 2,608
Likes: 0
Received 0 Likes on 0 Posts
Well their you go. Thats an option as well.
rx72c is offline  
Old 01-28-10, 01:12 AM
  #9  
Pistons are gay
5 Year Member
Thread Starter
iTrader: (11)
 
Boosted11's Avatar
 
Join Date: Dec 2006
Location: Prince George, BC
Posts: 1,973
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by sngl13b View Post
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
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.
Boosted11 is offline  
Old 01-28-10, 04:27 PM
  #10  
Rotary Freak
iTrader: (8)
 
rx72c's Avatar
 
Join Date: Jun 2003
Location: Australia
Posts: 2,608
Likes: 0
Received 0 Likes on 0 Posts
Put dwell on 4 ms with the mazda trailing coil packs.
rx72c is offline  
Old 01-28-10, 09:38 PM
  #11  
Pistons are gay
5 Year Member
Thread Starter
iTrader: (11)
 
Boosted11's Avatar
 
Join Date: Dec 2006
Location: Prince George, BC
Posts: 1,973
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by rx72c View Post
Put dwell on 4 ms with the mazda trailing coil packs.
Thanks mang. Probly come back to this when the microtech is in and preparing for setup.
Boosted11 is offline  
Old 03-18-10, 02:11 PM
  #12  
4th string e-armchair QB
5 Year Member
iTrader: (11)
 
Trots*88TII-AE*'s Avatar
 
Join Date: May 2005
Location: North Bay, Ontario
Posts: 2,745
Likes: 0
Received 0 Likes on 0 Posts
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.
Trots*88TII-AE* is offline  
Old 03-18-10, 07:26 PM
  #13  
talking head
5 Year Member
 
bumpstart's Avatar
 
Join Date: Apr 2008
Location: Perth, WA, OZ
Posts: 2,775
Likes: 0
Received 2 Likes on 2 Posts
Originally Posted by Trots*88TII-AE* View Post
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.
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
bumpstart is offline  
Old 03-18-10, 09:29 PM
  #14  
4th string e-armchair QB
5 Year Member
iTrader: (11)
 
Trots*88TII-AE*'s Avatar
 
Join Date: May 2005
Location: North Bay, Ontario
Posts: 2,745
Likes: 0
Received 0 Likes on 0 Posts
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.
Trots*88TII-AE* is offline  
Old 03-21-10, 11:28 PM
  #15  
talking head
5 Year Member
 
bumpstart's Avatar
 
Join Date: Apr 2008
Location: Perth, WA, OZ
Posts: 2,775
Likes: 0
Received 2 Likes on 2 Posts
Originally Posted by Trots*88TII-AE* View Post
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.
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 )
bumpstart is offline  
Old 03-26-10, 03:27 PM
  #16  
Daily Used and Abused
iTrader: (1)
 
swkiller's Avatar
 
Join Date: Dec 2008
Location: South Florida
Posts: 286
Likes: 0
Received 0 Likes on 0 Posts
awsome info bumpstart
swkiller is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
rotor_veux
2nd Generation Specific (1986-1992)
3
09-28-15 09:25 PM
killerrx710
Adaptronic Engine Mgmt - AUS
5
09-28-15 09:13 AM
killerrx710
2nd Generation Specific (1986-1992)
1
09-24-15 10:57 PM


Thread Tools
Search this Thread
Quick Reply: Microtech LTX8S w/ Bosch Coils, MUST have?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: