matt-max
03-08-2003, 11:43
(refer to previous post in late january "dyno'd 03 today')
went back to the dyno with the freshly cleaned k&n fipk and the kennedy 4" system mounted and the updated uprated hot juice box from edge. (oil pressure gauge works now which is nice!)
also added spa digital gauge reading egt and boost. this gauge stores the peak values until reset for each function.
when i called to set up the dyno appointment for a diesel truck the owner asked if this was the guy with the chevy duramax. i replied no, it's a gmc, good-naturedly. he said the guys in the shop last time still hadn't stopped talking about the figures the truck pulled down a month or so ago!
dyno operator (dubbed 'son of fat b*st*rd' by my friend along for the ride) asked what my goal was for the day. i thought for a second or two and said '375hp.' he gave me a condescending look, saying 'that's alot of power, buddy.'
run 1 was stock with no box on the truck but with the 'improved' intake and exhaust. three runs were made, from 232-240hp. highest figure was the last run of the day with the box off and once engine was at its highest operating temp. peak boost was close to 20lbs i believe.
(previous run in january without intake and exhaust mods or box yielded 245hp stock with 18 degreee higher air temps, a difference of 5-12hp less.)
run 2 was new level 1 juice, the old level 2. peak hp was 287. this is a gain of 47-54hp on the day.
run 3 was new level 2 juice, old level 3. peak hp gained 19, up to 306, a gain of 66-73hp on the day.
run 4 was new level 3 juice, the top of the heap for the old juice. peak hp gained another 27, up to 333, gaining 93-100hp from stock on the day. previous run in january without exhaust or intake in old level 4 was 332hp, up 87hp from that day's stock run. perhaps the exhaust and intake mods were starting to work on these higher power levels? or maybe the old level 4 didn't hit quite as hard as the new 'identical' level 3? definitely the old level 4 feels stronger than this level 3, something others have noticed as well. apparently the seat of the pants dyno and the dynojet don't always agree!
run 5 was the new level 4 hot juice, advertised as adding 125 rear wheel hp. peak hp was 374, backed up by subsequent runs at 3/4-7/8 throttle (truck feels faster at smaller throttle openings than 100% to me) giving 366 and 367hp and a fourth run with foot to the floor yielding another 374hp reading. this is a gain of 134-141hp from the baseline on the same day on the same dyno less than an hour apart, and 41hp up on the old level 4.
boost peaked at 24.1 lbs on these hot juice runs. egts stayed under 650 and were not a concern. i had reached 28.4 lbs of boost the previous day cruising around and trying to get the allison accustomed to the hot juice. since the dyno runs i've seen a peak of 29 lbs and heard from others that 30 is not uncommon. does this mean that the peak dyno figures are a lower than what we are actually seeing on the road? it only takes a couple of seconds for the run, maybe not enough to reach full pressure...
the exhaust and intake both definitely make a difference in seat of the pants power and a bigger difference in the amount of time it takes from mashing foot to the floor and the rocket acceleration to follow. but to say either one or the other or both adds power was not proven on the dyno. peak egt's have not hit 800 degrees driving around in new level 4 all the time so maybe they help out some.
anybody know how i can access the torque readings from these runs? i've got the dyno jet viewing software downloaded and the disc of my runs but have not been able to figure it out yet.
matt
[ 03-08-2003: Message edited by: matt-max ]</p>
went back to the dyno with the freshly cleaned k&n fipk and the kennedy 4" system mounted and the updated uprated hot juice box from edge. (oil pressure gauge works now which is nice!)
also added spa digital gauge reading egt and boost. this gauge stores the peak values until reset for each function.
when i called to set up the dyno appointment for a diesel truck the owner asked if this was the guy with the chevy duramax. i replied no, it's a gmc, good-naturedly. he said the guys in the shop last time still hadn't stopped talking about the figures the truck pulled down a month or so ago!
dyno operator (dubbed 'son of fat b*st*rd' by my friend along for the ride) asked what my goal was for the day. i thought for a second or two and said '375hp.' he gave me a condescending look, saying 'that's alot of power, buddy.'
run 1 was stock with no box on the truck but with the 'improved' intake and exhaust. three runs were made, from 232-240hp. highest figure was the last run of the day with the box off and once engine was at its highest operating temp. peak boost was close to 20lbs i believe.
(previous run in january without intake and exhaust mods or box yielded 245hp stock with 18 degreee higher air temps, a difference of 5-12hp less.)
run 2 was new level 1 juice, the old level 2. peak hp was 287. this is a gain of 47-54hp on the day.
run 3 was new level 2 juice, old level 3. peak hp gained 19, up to 306, a gain of 66-73hp on the day.
run 4 was new level 3 juice, the top of the heap for the old juice. peak hp gained another 27, up to 333, gaining 93-100hp from stock on the day. previous run in january without exhaust or intake in old level 4 was 332hp, up 87hp from that day's stock run. perhaps the exhaust and intake mods were starting to work on these higher power levels? or maybe the old level 4 didn't hit quite as hard as the new 'identical' level 3? definitely the old level 4 feels stronger than this level 3, something others have noticed as well. apparently the seat of the pants dyno and the dynojet don't always agree!
run 5 was the new level 4 hot juice, advertised as adding 125 rear wheel hp. peak hp was 374, backed up by subsequent runs at 3/4-7/8 throttle (truck feels faster at smaller throttle openings than 100% to me) giving 366 and 367hp and a fourth run with foot to the floor yielding another 374hp reading. this is a gain of 134-141hp from the baseline on the same day on the same dyno less than an hour apart, and 41hp up on the old level 4.
boost peaked at 24.1 lbs on these hot juice runs. egts stayed under 650 and were not a concern. i had reached 28.4 lbs of boost the previous day cruising around and trying to get the allison accustomed to the hot juice. since the dyno runs i've seen a peak of 29 lbs and heard from others that 30 is not uncommon. does this mean that the peak dyno figures are a lower than what we are actually seeing on the road? it only takes a couple of seconds for the run, maybe not enough to reach full pressure...
the exhaust and intake both definitely make a difference in seat of the pants power and a bigger difference in the amount of time it takes from mashing foot to the floor and the rocket acceleration to follow. but to say either one or the other or both adds power was not proven on the dyno. peak egt's have not hit 800 degrees driving around in new level 4 all the time so maybe they help out some.
anybody know how i can access the torque readings from these runs? i've got the dyno jet viewing software downloaded and the disc of my runs but have not been able to figure it out yet.
matt
[ 03-08-2003: Message edited by: matt-max ]</p>