When I first got the car, I fitted a exhaust system and a airbox upgrade and it made 192rwkw. First time at the drags I went 13.89 @ 103mph
After the diff and clutch went, I got new LSD and fitted a heavier duty clutch. With the same 192rwkw, I went 13.44 @ 104mph
Then came edit a first tune of 218rwkw netted me a 13.22 @ 105mph
Retune later on achieved 234rwkw and got me a 13.08 @ 104mph
Now, with 240-250rwkw I ran a 12.92 @ 110mph
All of the above was done on the standard diff gears, full weight and second hand rubbish junk tyres pinched from the back of TyrePower.
Now with the 3.9’s fitted and a bit more tuning, I have achieved a best mph of 112.1
The diff gears made the whole quarter mile easier on the car and also quicker off the line. But with the poxy *** tyres, im only going slower due to loss of traction hindering my 60’ and ET. My first ever runs with the 3,9’s got me two 13.0’s upfront, now to achieve that on the standard 3,46’s would take a few goes to master the launch as I was hitting 4th just on the line with the standard diff gears, where with the 3,9’s, I was using most of 4th maintaining a shift RPM 0f 6000
In turn, a proper setup etc tyres, suspension and weight loss will achieve a better ET.
Obviously I am basing this on my 1650kg SS and a different
IRS setup to Fords,
Ah the days and lives of the drag racer/
Simon