1/26/2024 0 Comments Gtr evolution review![]() ![]() If you're like me and have a (crappy) oscilloscope where the dwell time to full charge can be observed and then input into the ECUFlash coil dwell settings, its ok if time to saturation is very long. As can be seen in Figure 1, even at 4.25 ms of dwell (charge) time on the factory Evo coil power harness, a GTR coil still hasn't reached saturation. Coil primary winding voltage versus time for GTR coils using Spoolinup coil power harness.Īnother issue with using the factory coil power supply harness is that the low voltage at the coils lengthens the time for the GTR coils to reach full charge. Coil primary winding voltage versus time for GTR coils using stock Evo coil power harness.įigure 2. It is pretty tough to get no voltage drop in the primary winding during coil charging, but thanks to Spoolinup, I now have a custom power harness that gives 13.4 V at saturation as shown in Figure 2.įigure 1. The goal is for the primary winding voltage to not drop at all during charging, so ideally it should be ~14 V at saturation. The primary winding voltage at peak charge with the factory coil power harness is only 9.3 V which is pretty poor. An example of this phenomenon is shown in Figure 1 that shows primary winding voltage as a function of time during coil charging using the factory Evo coil power harness. The other issue is that GTR coils have a very low primary winding resistance, and if the harness supplying power to the coils has any non-trivial amount of resistance, the primary winding voltage drops very low during coil charging, and spark energy is reduced. The resolution to this issue is to use a longer coil boot that Spoolinup includes as part of his GTR coil COP kit. In my case, spark energy leakage with the GTR boots was substantial enough that I had spark blow out at less than 15 psi with a spark plug gap of 0.028 inches. First is that the boot length is too short to have sufficient overlap on the spark plug ceramic, and when attempting to use GTR boots, there is a good chance that there will be spark energy leakage down the ceramic insulator. Getting GTR coils to work on an Evo is not quite as easy as Prius/Yaris coils for two reasons. In comparison, Prius/Yaris coils produce around 30 mJ and less than 2 ms spark duration. PRP says that spark energy is ~50 mJ and duration is a bit more than 2 ms. R35 GTR coils (which I'll just call "GTR coils" for the remainder of this post) are known to produce excellent spark energy. With the help of Spoolinup, I've made the switch from Prius/Yaris coils to R35 GTR coils. Please register or login to enable Dark Mode.Other Cars - For Sale - Wanting To Buy (WTB) Or Trade (WTT).Private 'Lancer (DE,ES,GTS) 2008+' For Sale / Wanted.Evo Vendor 'Group Buy / Specials' Classifieds.Mitsubishi Vehicles (Airtrek / Outlander).Lancer Ralliart Audio & Security (All models).04-06 Ralliart Tires/Wheels/Brakes/Suspension.04-06 Ralliart Aftermarket Forced Induction Tech. ![]() Evo Tires / Wheels / Brakes / Suspension.Evo X Tires / Wheels / Brakes / Suspension.Evo X Engine Management / Tuning Forums.EvoM Featured Car of the First Quarter!. ![]()
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