Uploaded February 2025 | Updated September 2026, 26 minutes ago
In the middle of Sick week 2025, a road-tripping drag racing event, I decided that Blasphemi really needed to be tuned on a chassis dyno. So, in the middle of the event, we stopped by Kevin Smith's KSR Performance in Gainesville, Florida, to strap the car to his Dynojet and measure the power output of the 528ci Hemi. We did this because the day before, we noticed our Holley Dominator EFI system adding nearly 300 lb/hr of additional fuel to the base fuel map even though we weren't asking it to do so. Luckily, Pete Harrell, owner of Harrel Engine and Dyno, the shop that built the Hemi was onhand to dissect the data we were looking at and to make the calls on how to adjust the tune. What we discovered on the dyno was that Cylinder number 5 was running lean, even though the average of all the cylinders were not. By adding fuel to just that cylinder, were able to lower its Exhaust Gas Temperature and subsequently the EFI system stopped adding so much extra fuel to every cylinder of the engine. The engine responded positively and we left KSR feeling much better about the health of the Hemi. This is Finnegan's Garage Episode Number 335 and next month we'll have the entire movie of this event edited and uploaded here to YouTube.
If you like this kind of content then please support the channel by purchasing some apparel from my website: fsmgarage.com
And if you aren't already subscribed to Pete Harrel, Kevin Smith or David Newbern's channels then here are links to their awesome spots:
@realgoodatdoinstuff900
@KSRPerformanceFabrication
@12VoltDave
:)
-Finnegan
In the middle of Sick week 2025, a road-tripping drag racing event, I decided that Blasphemi really needed to be tuned on a chassis dyno. So, in the middle of the event, we stopped by Kevin Smith's KSR Performance in Gainesville, Florida, to strap the car to his Dynojet and measure the power output of the 528ci Hemi. We did this because the day before, we noticed our Holley Dominator EFI system adding nearly 300 lb/hr of additional fuel to the base fuel map even though we weren't asking it to do so. Luckily, Pete Harrell, owner of Harrel Engine and Dyno, the shop that built the Hemi was onhand to dissect the data we were looking at and to make the calls on how to adjust the tune. What we discovered on the dyno was that Cylinder number 5 was running lean, even though the average of all the cylinders were not. By adding fuel to just that cylinder, were able to lower its Exhaust Gas Temperature and subsequently the EFI system stopped adding so much extra fuel to every cylinder of the engine. The engine responded positively and we left KSR feeling much better about the health of the Hemi. This is Finnegan's Garage Episode Number 335 and next month we'll have the entire movie of this event edited and uploaded here to YouTube.
If you like this kind of content then please support the channel by purchasing some apparel from my website: fsmgarage.com
And if you aren't already subscribed to Pete Harrel, Kevin Smith or David Newbern's channels then here are links to their awesome spots:
@realgoodatdoinstuff900
@KSRPerformanceFabrication
@12VoltDave
:)
-Finnegan
