Direct Fire Question
#1
Full Member
Thread Starter
Join Date: Feb 2003
Location: seabrook
Posts: 58
Likes: 0
Received 0 Likes
on
0 Posts
Direct Fire Question
I have been trying to keep up with this direct fire rave that everyone is talking about and I can't figure out which setup is right? Iv'e seen setups only using 1 coil, 2 coils & 3 coils. So which way is right/the best? If it makes any difference I have a 84 gs. Thanks in advance.
#4
Alright, here is the deal:
1 coil...that simply isn't possible. Aside from the distributer there are two seporate ignition systems for your rx7. One is for leading and one is for trailing. You need at least 1 coil for each.
2 coils...what you have seen here is probably a stock coil for the trailing ignition, and one fc or fd coil for the leading ignition. I have only seen a couple setups done this way, and I am not sure if they are still running.
3 coils...1 coil for the trailing, run through the dizzy, and 2 for the leading. There are a few variations with this one, the most common being dlidfis.
dlidfis - dual leading ignitor direct fire ignition system (see why it is abbreviated) basically you wire 2 coils, and 2 ignitors to fire off the leading plugs in wasted spark mode.
slidfis (pmdfis) - single leading ignitor blah blah (poor mans blah blah) use 1 ignitor to fire 2 coils, i don't know if anybody is doing this right now either.
CDI DFI - capacative discharge ignition (MSD) direct fire - using a CDI box to fire off the two coils.
Alright that is the general stuff, do you have any specific questions?
I am using an MSD 6a box firing off two MSD blaster2 coils, it works alright for me but i haven't compared it to anything but stock, and it was a slight improvement in idle and overall smoothness.
-Marques
1 coil...that simply isn't possible. Aside from the distributer there are two seporate ignition systems for your rx7. One is for leading and one is for trailing. You need at least 1 coil for each.
2 coils...what you have seen here is probably a stock coil for the trailing ignition, and one fc or fd coil for the leading ignition. I have only seen a couple setups done this way, and I am not sure if they are still running.
3 coils...1 coil for the trailing, run through the dizzy, and 2 for the leading. There are a few variations with this one, the most common being dlidfis.
dlidfis - dual leading ignitor direct fire ignition system (see why it is abbreviated) basically you wire 2 coils, and 2 ignitors to fire off the leading plugs in wasted spark mode.
slidfis (pmdfis) - single leading ignitor blah blah (poor mans blah blah) use 1 ignitor to fire 2 coils, i don't know if anybody is doing this right now either.
CDI DFI - capacative discharge ignition (MSD) direct fire - using a CDI box to fire off the two coils.
Alright that is the general stuff, do you have any specific questions?
I am using an MSD 6a box firing off two MSD blaster2 coils, it works alright for me but i haven't compared it to anything but stock, and it was a slight improvement in idle and overall smoothness.
-Marques
#6
My wife bought me 2 RX-7s
Join Date: Aug 2001
Location: Saskatoon, Saskatchewan, Canada
Posts: 2,328
Likes: 0
Received 2 Likes
on
2 Posts
Click and ye shall be rewarded:
The FAQ dost have all the answers that thou willst desire.
https://www.rx7club.com/showthread.p...hreadid=237777
The FAQ dost have all the answers that thou willst desire.
https://www.rx7club.com/showthread.p...hreadid=237777
#7
Full Member
Join Date: Aug 2003
Location: directly above the center of the earth
Posts: 130
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by MosesX605
Click and ye shall be rewarded:
The FAQ dost have all the answers that thou willst desire.
https://www.rx7club.com/showthread.p...hreadid=237777
Click and ye shall be rewarded:
The FAQ dost have all the answers that thou willst desire.
https://www.rx7club.com/showthread.p...hreadid=237777
at least I read all the threads and all the setups use the distributor for the trailing plugs.
Trending Topics
#8
I read your email
Originally posted by mwatson184
Alright, here is the deal:
2 coils...what you have seen here is probably a stock coil for the trailing ignition, and one fc or fd coil for the leading ignition. I have only seen a couple setups done this way, and I am not sure if they are still running.
Alright, here is the deal:
2 coils...what you have seen here is probably a stock coil for the trailing ignition, and one fc or fd coil for the leading ignition. I have only seen a couple setups done this way, and I am not sure if they are still running.
#9
sold the FD...kept the FB
Originally posted by inittab
My (FC coil/2nd Gen coil/FCDFIS) is running perfectly. I chose this setup because it's very simple to setup and has minimum components, wiring and connectors. Simpler the better.
My (FC coil/2nd Gen coil/FCDFIS) is running perfectly. I chose this setup because it's very simple to setup and has minimum components, wiring and connectors. Simpler the better.
I could'nt agree more. My FDDFIS has been running strong for a whole year. There is absolutly no advantage to wiring another ignitor. Stock mazda coils are high quality...Cheap aftermarket coils like Blaster 2 units are junk.
#10
Senior Member
Join Date: Oct 2002
Location: Hampton, VA
Posts: 596
Likes: 0
Received 0 Likes
on
0 Posts
I'm going to venture to the whole DLIDFIS. I just bought another ignitor on Ebay and I'll probably grab another good stock coil if I can find one just to get it all started... then I'll upgrade coils later.
#11
THE ONE. THE ONLY!
iTrader: (2)
honegod.
if you direct fire all plugs at once i believe it is impossable for performance. my understanding is the trailing needs to run off the dizzy because the the spark would happen in the intake point . so you will be firing when gas is coming in. the leading plugs are right past the intake chamber so it fires on exhaust. yeah that sounds screwed up. hopefully i didn't confuse you more.
if you direct fire all plugs at once i believe it is impossable for performance. my understanding is the trailing needs to run off the dizzy because the the spark would happen in the intake point . so you will be firing when gas is coming in. the leading plugs are right past the intake chamber so it fires on exhaust. yeah that sounds screwed up. hopefully i didn't confuse you more.
#13
Full Member
Join Date: Aug 2003
Location: directly above the center of the earth
Posts: 130
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by kettlman
hopefully i didn't confuse you more.
hopefully i didn't confuse you more.
I just WANT to get rid of the distributor cap and am hoping for some magic
#14
Lapping = Fapping
iTrader: (13)
Well, there is a way to run direct fire with only one coil and no distributor cap. Use an FC coil on leading and don't run trailing at all. Hehe.
By the way, I just picked up an FC leading coil yesterday and I'm going to use my MSD 6AL on it. I also picked up a spare Diamond coil. Since I already have a spare J-109 ignitor, I'm all set to have a rev-limitable ballast resistorless ignition system (where the L/T split won't matter too much).
By the way, I just picked up an FC leading coil yesterday and I'm going to use my MSD 6AL on it. I also picked up a spare Diamond coil. Since I already have a spare J-109 ignitor, I'm all set to have a rev-limitable ballast resistorless ignition system (where the L/T split won't matter too much).
#17
Full Member
Join Date: Aug 2003
Location: directly above the center of the earth
Posts: 130
Likes: 0
Received 0 Likes
on
0 Posts
heh, my main thrust was to make the hall effect dizzy shorter, the cap is a TALL sucker.
it just occurred to me that it is possible that the cap and rotor from a POINTS setup should fit, and work for a DLIDFIS setup.
I have all the above available and will check for fitment when I wake.
any idea on how well it would work, if it fits ?
it just occurred to me that it is possible that the cap and rotor from a POINTS setup should fit, and work for a DLIDFIS setup.
I have all the above available and will check for fitment when I wake.
any idea on how well it would work, if it fits ?