I’ve had my Jacobs Pro Street ignition for about 3 years. I’ve had LOTS of people ask me if it’s worth the money.. This evening I decided to put if to the test with my G-Tech meter and see if it make a difference in running my 4Runner down the quarter mile.

all ten runs were done within 1/2 hour from each other and all on the same road going in the same direction..

Check out my results:

With Jacobs
22.74@61.6mph
22.25@63.2mph
22.25@63.0mph
21.93@65.0mph
22.05@64.3mph
Average 22.24@63.42

Stock Ignition:
22.51@63.1mph
22.15@63.8mph
21.85@65.3mph
22.29@64.2mph
21.88@65.0mph
Average 22.09@64.28mph

Spark plugs were gapped at .050” and indexed per instruction from Jacobs electronics.

Keep on truckin’
RAZZ

you might wanna try increasing the gap a little. i'm going with .057", which was one of the few i experimented with. you gotta find the right gap that works the best with your engine.

I went with even more gap than that on my 1990 V6, with some noticeable improvement in the sub-3000 RPM range at part throttle. But no mileage improvement, and no full throttle improvement. Jacobs is a waste IMHO.

I recently put the jacobs ice pack (cost $130 on ebay) on my 92 22re, gapped plugs .015 over, and I could feel a power increase. Engine starts easy and runs smooth. I feel it was worth it but I wouldnt pay retail for it.