I found the 86 gti engine (8V)running the cis-e jetronic would actually work fine with revs up 7K even in hot weather without problems, but the wimpy 0.028\" spark plug gap left me wondering if I could improve my idle/fuel mileage/BHP.....so I opened it up to 0.030\" and ran the same test(using OE coil/wires)...... engine @191F/5800RPM travelling up a 4degree slope and 92octane at sea level with 26Celcius ambient outside temps, and the engine began to \"miss\", swapped coil out for aftermarket unit and no miss was felt until 6400RPM, changed the wires to aftermarket(50ohms/ft, 9mm spiral) and voila!...no miss right up to 7Krpm...........Opened my plug gap to 0.032\", no missing or noticeable problems, opened gap to 0.034\", slight miss beginning at 6700rpm........Swap out ignition coil for another different coil, and rewired battery to engine/body and replaced power wire to ignition coil with a relay and 8gauge power wire from battery......0.034\"..revs to 7Krpm no problems and after rewiring, opening plug gap to 0.034\", car now idles smoother, starts better and is slightly better on fuel......downside so far is distributer cap and rotor wear out faster than usual.............notice I did not mention any \"brands\", however, from my own testing, I believe that the O.E ignition wires are junk, and the wiring to the coil/battery/engine need to be upgraded, the coil is probably satisfactory but I personally hate canister oil type coils(E-core resin ones seem best) Don't think I gained much anything for HP but maybe 1Hp with larger plug gap/cleaner & better HV to plugs.........again, this was all free for me to test and keep, but for probably $150 I would certainly upgrade the wires and coil and basic chassis wiring. But, if you don't like messing with your plug gap and don't plan on reving past 6K or are satisfied with fuel mileage, it's probably not worth doing.......I run an MSD 6AL in my Xr4Ti, but that's a different reason., and no I didn't notice any difference from the OE EEC-IV TFI, I wanted a fancy rev limiter that looked good under the hood. P.S. One of the best working coils I used wasn't aftermarket!....I got my BEST results with an OE Audi 5KTurbo epoxy E core type coil!
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