Blob1620 Posted September 20, 2015 Share Posted September 20, 2015 Ive been chasing my tail with the runability of my rb25. Its a fresh rebuild, i now have about 1000 miles on it, and it still seems to have basic runability issues. Has a little fart (misfire) now and again when its cold and warming up, AFR is comfortably in the 12's range when Im at full throttle, and my timing is set to stock 15 degrees base timing. The power is very underwelming, and when I get up to 6500-6800 rpm or so, it randomely breaks up, almost like hitting a soft rev limiter. My searches for the rev limit with a stock ecu have come up with a wide range of oppinions. But since it seems to be different every time, Im more suspect of an ignition issue. It has factory coils, ive gotten better runability every time I close that gap more (currently at .8mm) and dont feel Inshould be closing it more. Has anyone had similay runability issues whne their coils were startig to give up? Quote Link to comment Share on other sites More sharing options...
ihiryu Posted September 20, 2015 Share Posted September 20, 2015 Yup sounds like it's time for coils or Ignitor. It you are a series 1 you can ditch the coils and Ignitor by moving to LS coils. Quote Link to comment Share on other sites More sharing options...
ZT-R Posted September 22, 2015 Share Posted September 22, 2015 Comfortably in the 12s wide open? i would say 11.8 is comfy. Im running AEM coils no problems at 710whp. Quote Link to comment Share on other sites More sharing options...
flatrate Posted September 23, 2015 Share Posted September 23, 2015 LS coils work well, but a little more involved on the install. I'm using splitfire coils at .025 plug gap and 35psi and make 800whp without a hicup Quote Link to comment Share on other sites More sharing options...
ihiryu Posted September 24, 2015 Share Posted September 24, 2015 True, it does take a bit of work, but it's cheap and effective. Quote Link to comment Share on other sites More sharing options...
helghast7 Posted September 25, 2015 Share Posted September 25, 2015 A bit of work? Go to your local junkyard pick up some LS coils with their harness for dirt cheap. Wire them up as per the write up on NICO which is basically match the colors to the coils and add an extra power and ground. BAM your done, coils that will pretty much last forever and are stronger than most coils that go for double or triple the price. Quote Link to comment Share on other sites More sharing options...
ihiryu Posted September 29, 2015 Share Posted September 29, 2015 It's mounting them that takes a lot of work. Lol I haven't had a chance to redo mine on the skyline, but they are currently just plopped in place right now. Quote Link to comment Share on other sites More sharing options...
helghast7 Posted September 30, 2015 Share Posted September 30, 2015 ^if you run the LQ9's mojoracing in florida makes a mounting bracket. I run it, makes things painless. If you run the other ones then good luck and may the force be with you lol. Quote Link to comment Share on other sites More sharing options...
Blob1620 Posted October 1, 2015 Author Share Posted October 1, 2015 What about the Australian hot rod coils I keep seeing around? has anyone run them? seems a more direct replacement, and similar/less cost then the LS coils. Are they really just not any good? Yellow jackets, Splitfire, racing parts warehouse..... are non of these worth buying? Quote Link to comment Share on other sites More sharing options...
ihiryu Posted October 3, 2015 Share Posted October 3, 2015 Yellow Jackets are trash from what I've read. It's either spitfires or LS coils. The problem with Spitfires are they are crazy expensive. Quote Link to comment Share on other sites More sharing options...
helghast7 Posted October 6, 2015 Share Posted October 6, 2015 I've heard of spitfires failing often too. Everything fails but LS coils have a good history of lasting a long time and firing stronger. We have a few fleets at my job that have work trucks in the 200k+ range that are still on the factory coils. Quote Link to comment Share on other sites More sharing options...
Blob1620 Posted October 20, 2015 Author Share Posted October 20, 2015 Hmm, ok. Been doing some looking into this, and I must be google dumb because I cant find literature on the MojoRacing setup... Anyhow. I'm going to try the dielectric grease "rebuild" band-aid and see if that does anything while I keep searching for some LS coils. Building my own bracket doesn't scare me. I just am not in the position to waste money on something I need to redo a month later at the moment. Thanks for all the input folks! Quote Link to comment Share on other sites More sharing options...
Blob1620 Posted October 20, 2015 Author Share Posted October 20, 2015 Has anyone seen this bracket solution? really clean solution! Quote Link to comment Share on other sites More sharing options...
Bernardd Posted October 20, 2015 Share Posted October 20, 2015 I've just finished tuning a rb26dett with gm wasted spark coils. They're mounted on the firewall with wires run to each cylinder. Running stock coil maps with ngk plugs. The engine makes around 600 to the wheels. Quote Link to comment Share on other sites More sharing options...
bradyzq Posted October 20, 2015 Share Posted October 20, 2015 Have you checked your grounds? Quote Link to comment Share on other sites More sharing options...
speeder Posted December 3, 2015 Share Posted December 3, 2015 Has anyone seen this bracket solution? really clean solution! http://www.mojoperf.com/?q=node/4 Coil on plug mounting of the LQ9 truck coils and Plug and play harnesses for Series 1 and Series 2 RB25/26. Quote Link to comment Share on other sites More sharing options...
ihiryu Posted December 14, 2015 Share Posted December 14, 2015 Yeah, personally I had LRB Speed make me a coil cover, and I just welded bosses for the coils. LRB Speed pre-drilled the portion for the plug wires. However, I'm also using LS1 coils, and not the truck coils. He did the coil cover for about 70 shipped, then I bought the bungs online for 25 bucks, and had a shop weld it up for another 30 bucks. I bought the coils on the forums for 100 bucks, had to buy wires 65 bucks, and the coil covers 130. So about 300 bucks complete. Just had to wire it up myself Quote Link to comment Share on other sites More sharing options...
Blob1620 Posted January 18, 2016 Author Share Posted January 18, 2016 (edited) I did the ls2 coil swap with the mojo performance bracket, connectors to modify the harness care of wiring specialties. the picture was taken half way through with the wiring not yet complete, but it gives you the idea. Initial impression, big time improvement. still a vibration at 3k rpm but come to find out my FPR is failing so theres a new one on the way to fix that. this thing should be pretty angry when its done. Edited January 19, 2016 by Blob1620 Quote Link to comment Share on other sites More sharing options...
ihiryu Posted January 20, 2016 Share Posted January 20, 2016 Very nice. Truck coils are so nice. I just the coil cover from LRBSpeed. I think it set me back 60 bucks? Quote Link to comment Share on other sites More sharing options...
Wizzurp Posted January 20, 2016 Share Posted January 20, 2016 That looks nice, hides them well. You'll definitely like those coils, they pretty much never fail, are good to fairly high hp and are very cheap if you ever actually have to replace one. Quote Link to comment Share on other sites More sharing options...
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