2 diff dynos 2 totally diff readings

03snakeminated · October 21st, 2008, 07:45 AM

sucks that the previous dyno i took the car (i wasn't there) the guy gtuned the car and gave me the dyno slip and showed the car made 488/478tq and yesterday just for shits an giggles since they were running a special, i took the car to another dyno and in the base run car made only 445/440tq, they both were dynojets and weather was pretty much the same if not warmer the first time, now why so much of a difference? its only been about 43 days

DiZzyBonne · October 21st, 2008, 08:02 AM

SAE smoothing maybe? What does the sheet say for both?

futureMACH1racer · October 21st, 2008, 11:49 AM

Could've been alot of things, were you there the first time?

weems · October 21st, 2008, 12:03 PM

Originally Posted by futureMACH1racer

Could've been alot of things, were you there the first time?

Originally Posted by 03snakeminated

sucks that the previous dyno i took the car (i wasn't there) the guy gtuned the car and gave me the dyno slip and showed the car made 488/478tq and yesterday just for shits an giggles since they were running a special, i took the car to another dyno and in the base run car made only 445/440tq, they both were dynojets and weather was pretty much the same if not warmer the first time, now why so much of a difference? its only been about 43 days

Trick Tuners · October 21st, 2008, 04:41 PM

40hp can easily be due to different IAT and ECT temps.

WilltheThrill · October 21st, 2008, 06:02 PM

did they drain your intercooler and then ice it yesterday?

03snakeminated · October 21st, 2008, 09:12 PM

no i wasn't there the first time, and no icing the ic, i think the dyno from yesterday is way off, idk maybe needs to be recalibrated, 445hp its freaking low for a ported, pullied 2.80 and 2 lb lower eaton, then he tuned to 475/481tq, and that was squeezing every little bit of fuel through stock pump and injectors, no more could be had, i was there and he added more timing too then what i had.

WilltheThrill · October 22nd, 2008, 12:00 AM

im sure the intercooler not being iced is part of the problem.

BoostFiend · October 22nd, 2008, 03:28 AM

Dyno operators can make the dyno read whatever they want to. Thats why dyno's aren't a good indicator of what kind of power your car is making. They are good tuning tools but people rely on dyno #'s too much. I'm also not a big fan of icing the blower or putting ice in the I/C res. Kinda seems like cheating to me.

Although I do ice my blower at the track. lol I took my Cobra to a local dyno day and my Stage IV ported, 2.93, 4# lower car put down 449rwhp and 479rwtq, no ice, no fans. With the Stage IV port and a 2.76 upper only my car put down 491/467 on a different dyno previously. So just for comparison a guy I know put his freshly built 347 stroker on the dyno and he put down 324rwhp and like 370 rwtq. Just a few weeks ago my car put down 486rwhp and 517 rwtq on yet another dyno also with no ice and no fans.. Just goes to show you the difference. Oh and one other point. Even the TIRES you use can cause different readings. Some Drag radials and slicks will show lower numbers than street tires due to the sidewall flex.

futureMACH1racer · October 22nd, 2008, 10:07 AM

+1 Boost, I remembered that as soon as I read your post.

03snakeminated · October 22nd, 2008, 12:30 PM

that sucks if the first tuner iced out the intercooler and didn't tell me, (just to read higher hp numbers), i should of been told, that deff could be why the numbers were off, I'm glad i stuck around this time,(without icing the i/c he got me 475) i learned something new, now i know a trick to be Faster On Race Day, so by just icing that sucker i should see maybe 10-15 extra ponies?

03snakeminated · October 22nd, 2008, 12:34 PM

not like that's going to matter a lot, but it's alway good to know

WilltheThrill · October 22nd, 2008, 01:39 PM

Originally Posted by 03snakeminated

so by just icing that sucker i should see maybe 10-15 extra ponies?

yes sir

according to the dynojet at RET, mine (nonported stock air tube, stock TB, stock plenum, 2.8 upper w/100mm idler, stock lower pulley) put down 11 more hp and 12 more tq to the rear wheels after draining and icing the intercooler

WilltheThrill · October 22nd, 2008, 01:47 PM

Originally Posted by 03snakeminated

not like that's going to matter a lot, but it's alway good to know

it will when youre going up against a well modded ls1 car

rk_2000_Z/28 · October 22nd, 2008, 06:12 PM

Originally Posted by BoostFiend

Dyno operators can make the dyno read whatever they want to. Thats why dyno's aren't a good indicator of what kind of power your car is making. They are good tuning tools but people rely on dyno #'s too much.

Ding, ding, ding, ding! Winner right here!

I don't yet know what your prize is, but you nailed it. A 40 HP difference is quite large but not unbelieavable when jumping from dyno to dyno.

Goblin · October 24th, 2008, 03:28 PM

This isnt suprising news. Ive seen this a thousand times. This is why i dont even waste my money or time with chassis dynos.

yojoe600 · October 24th, 2008, 03:32 PM

that sucks that they can make it read what they want

BoostFiend · October 24th, 2008, 04:03 PM

Originally Posted by rk_2000_Z/28

Ding, ding, ding, ding! Winner right here!

I don't yet know what your prize is, but you nailed it. A 40 HP difference is quite large but not unbelieavable when jumping from dyno to dyno.

Thank you sir! I have still not recieved my prize.

lol

futureMACH1racer · October 24th, 2008, 05:57 PM

Your prize was rep from me.

ChrisJ · October 24th, 2008, 06:43 PM

Smoothing would be my guess...

October 21st, 2008, 07:45 AM	#1
03snakeminated Regular Join Date: Aug 2008 Posts: 423 iTrader: 0 reviews	2 diff dynos 2 totally diff readings sucks that the previous dyno i took the car (i wasn't there) the guy gtuned the car and gave me the dyno slip and showed the car made 488/478tq and yesterday just for shits an giggles since they were running a special, i took the car to another dyno and in the base run car made only 445/440tq, they both were dynojets and weather was pretty much the same if not warmer the first time, now why so much of a difference? its only been about 43 days

October 21st, 2008, 08:02 AM	#2
DiZzyBonne Enthusiast 2001 Ford Mustang Bullitt Join Date: Apr 2008 Location: Bay Area Posts: 933 iTrader: 2 reviews	SAE smoothing maybe? What does the sheet say for both? __________________ Current mods: Maximum Motorsports XL Full Length Subframe Connectors Catted Bassani X-Pipe Borla Stinger Catbacks H&R Super Sport Springs MM Bullitt Crew Founder and Member #1

October 21st, 2008, 11:49 AM	#3
futureMACH1racer Honeybadger is Crazy 2008 F-250 Super Duty Join Date: Sep 2007 Location: United States of America Posts: 10,901 iTrader: 0 reviews	Could've been alot of things, were you there the first time? __________________ RIP Travis Bilings 5/6/1982-7/5/2011 Be polite. Be professional. But have a plan to kill everyone you meet.

October 21st, 2008, 04:41 PM	#5
Trick Tuners MM Fanatic KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 4,471 iTrader: 3 reviews	40hp can easily be due to different IAT and ECT temps. __________________ Check out my forums for stuff on troubleshooting, tuning, etc We teamed up with Socal Performance Racing to bring dyno tuning to San Diego. Be friends with us on FB

October 22nd, 2008, 03:28 AM	#9
BoostFiend Regular '03 Cobra, '89 +'91 Notch 11.63@120.08, Cobra Join Date: Oct 2008 Location: Oregon Posts: 342 iTrader: 0 reviews	Dyno operators can make the dyno read whatever they want to. Thats why dyno's aren't a good indicator of what kind of power your car is making. They are good tuning tools but people rely on dyno #'s too much. I'm also not a big fan of icing the blower or putting ice in the I/C res. Kinda seems like cheating to me. Although I do ice my blower at the track. lol I took my Cobra to a local dyno day and my Stage IV ported, 2.93, 4# lower car put down 449rwhp and 479rwtq, no ice, no fans. With the Stage IV port and a 2.76 upper only my car put down 491/467 on a different dyno previously. So just for comparison a guy I know put his freshly built 347 stroker on the dyno and he put down 324rwhp and like 370 rwtq. Just a few weeks ago my car put down 486rwhp and 517 rwtq on yet another dyno also with no ice and no fans.. Just goes to show you the difference. Oh and one other point. Even the TIRES you use can cause different readings. Some Drag radials and slicks will show lower numbers than street tires due to the sidewall flex. __________________ Last edited by BoostFiend; October 22nd, 2008 at 03:36 AM.

October 21st, 2008, 09:12 PM	#7
03snakeminated Regular Join Date: Aug 2008 Posts: 423 iTrader: 0 reviews	no i wasn't there the first time, and no icing the ic, i think the dyno from yesterday is way off, idk maybe needs to be recalibrated, 445hp its freaking low for a ported, pullied 2.80 and 2 lb lower eaton, then he tuned to 475/481tq, and that was squeezing every little bit of fuel through stock pump and injectors, no more could be had, i was there and he added more timing too then what i had.

October 22nd, 2008, 10:07 AM	#10
futureMACH1racer Honeybadger is Crazy 2008 F-250 Super Duty Join Date: Sep 2007 Location: United States of America Posts: 10,901 iTrader: 0 reviews	+1 Boost, I remembered that as soon as I read your post. __________________ RIP Travis Bilings 5/6/1982-7/5/2011 Be polite. Be professional. But have a plan to kill everyone you meet.

October 22nd, 2008, 12:30 PM	#11
03snakeminated Regular Join Date: Aug 2008 Posts: 423 iTrader: 0 reviews	that sucks if the first tuner iced out the intercooler and didn't tell me, (just to read higher hp numbers), i should of been told, that deff could be why the numbers were off, I'm glad i stuck around this time,(without icing the i/c he got me 475) i learned something new, now i know a trick to be Faster On Race Day, so by just icing that sucker i should see maybe 10-15 extra ponies? Last edited by 03snakeminated; October 22nd, 2008 at 12:33 PM.

October 22nd, 2008, 12:34 PM	#12
03snakeminated Regular Join Date: Aug 2008 Posts: 423 iTrader: 0 reviews	not like that's going to matter a lot, but it's alway good to know

October 24th, 2008, 03:28 PM	#16
Goblin Hardcore Enthusiast 88mm Join Date: Apr 2007 Location: Tucson, AZ Posts: 2,111 iTrader: 0 reviews	This isnt suprising news. Ive seen this a thousand times. This is why i dont even waste my money or time with chassis dynos. __________________

October 24th, 2008, 05:57 PM	#19
futureMACH1racer Honeybadger is Crazy 2008 F-250 Super Duty Join Date: Sep 2007 Location: United States of America Posts: 10,901 iTrader: 0 reviews	Your prize was rep from me. __________________ RIP Travis Bilings 5/6/1982-7/5/2011 Be polite. Be professional. But have a plan to kill everyone you meet.

October 24th, 2008, 06:43 PM	#20
ChrisJ RLY SRS Join Date: Aug 2005 Location: Ft. Meade, MD Posts: 36,743 Blog Entries: 4 iTrader: 9 reviews	Smoothing would be my guess... __________________ 2008 Acura TL Type-S - 2008 EB Ford Expedition - 2002 Boosted GT - Sold Facebook Google+

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