DISCONTINUED

VTT is proud to offer ignition coil replacements for the B58/S58/B48 platforms.

We started our quest for coils by contacting multiple coil manufacturing companies, paying for individual coils to be made then putting them through rigorous testing in the USA to ensure they matched or exceeded factory output. Once we were satisfied with the testing, we had the best performing coils made to our colors and specs.

VTT B58 Coils are tested against a factory Bosch B58 coil. The VTT performance matches or exceeds the factory B58 Bosch Coil.

Note:  To extract maximum performance from VTT coils, minor tune changes are required to optimize dwell periods. 

VTT B58: 4.7ms

Coils Tested using the below setup:

The test setup was configured in compliance with the SAE 973-202011 standards with a modification to the measurement of secondary spark current. The modification uses a shunt resistor instead of a current clamp for increased accuracy of secondary spark current measurements. It is important to note that comparisons cannot be made between my tests and those performed by others as conditions and component tolerances will vary. Much like a dyno, accurate comparisons can only be achieved when testing is performed with the same equipment and procedures (although I do welcome others to repeat my tests).

All tests were performed at a power supply regulated voltage of 14V with a lead acid battery inline for buffering. Dwell time was controlled by a waveform generator (simulated 8000 RPM) that controls an ISL9V5036S3ST IGBT as the coils tested are all “dumb” coils without igniters. The ISL9V5036S3ST is the same IGBT that is used in MSD80 DMEs and was picked to compare thermal data between the coils tested and the stock N54/N55 ignition coils. The thermal study was conducted with the IGBT in free air at room temperature (67F) with no thermal compound or heatsinking. This was done to see the impact of certain coils better and dwell times on the IGBT without having to sample data for an hour. Thermal tests concluded once the IGBT reached 160F or 260 seconds of testing. IGBT temperature was sampled every 20 seconds with a FLIR thermal imaging camera, while ignition coil temperature was sampled every 20 seconds with two thermocouples.