- Joined
- Dec 25, 2002
- Location
- mont, AL
In recent days I've discovered yet another item on the list of ms&s setups that I know at least a couple of you guys are using that isnt quite right (don't worry, I'm using the same one myself).. and that is the bosch 124 ignition module that was once thought to work fine, altho several coils were dispatched for no apparent reason by me and roto re me until we put a resistor on the 12v.
comically enough, the coil on the supra blew up last weds (and blew up the ignition module it was attached to as well, pretty cool to look act actually), and even more interesting, the car would arbitrarily blow the spark out in the upper rpms (like mine did) on the dyno.. it was about this time that someone on msefi pointed out that neither the toyota module we were using nor the bosch 124 module that comes standard on lh 2.2 and 2.4 volvos, has built in dwell control (and current limiting for the coil, hence the explosions). the patch for this has been to use a resistor pack, however that in and of itself has led to both roto's and my car's sensitivity to spark plug gap (bigger gap is better).
the short of it... we needa be running 139 modules (i think its 129/139). if you diligently read the ms&s documentation and are already using one, cool, if you're not even using the volvo module, this doenst apply to you (doug). We figured whats actually happening (on the supra) is that since ms can't control dwell, as the rpms rise, the signal "strays" for lack of a better word, and starts hitting other posts in the cap, not as big a problem on the volvo since the gap between posts is larger, but yea..
comically enough, the coil on the supra blew up last weds (and blew up the ignition module it was attached to as well, pretty cool to look act actually), and even more interesting, the car would arbitrarily blow the spark out in the upper rpms (like mine did) on the dyno.. it was about this time that someone on msefi pointed out that neither the toyota module we were using nor the bosch 124 module that comes standard on lh 2.2 and 2.4 volvos, has built in dwell control (and current limiting for the coil, hence the explosions). the patch for this has been to use a resistor pack, however that in and of itself has led to both roto's and my car's sensitivity to spark plug gap (bigger gap is better).
the short of it... we needa be running 139 modules (i think its 129/139). if you diligently read the ms&s documentation and are already using one, cool, if you're not even using the volvo module, this doenst apply to you (doug). We figured whats actually happening (on the supra) is that since ms can't control dwell, as the rpms rise, the signal "strays" for lack of a better word, and starts hitting other posts in the cap, not as big a problem on the volvo since the gap between posts is larger, but yea..
to do it.
is that the 124 module doesn't have the built in dwell control, and really isn't right for MSnS. The coil doesn't really make any difference in that respect, though it may be tough enough to withstand the abuse from the 124 module.
