Help reading dyno sheets
Thread Starter
Melting Slicks
Joined: Aug 2010
Posts: 3,063
Likes: 82
From: Tumwater, WA
Help reading dyno sheets
I have two dyno sheets, 1 at 6 psi and the other at 8 psi foe an ECS supercharger on 91 octane at about 3500 elevation. The first one shows the rpms but the second shows other numbers which Im not sure what they represent. Can someone explain this to me?
Also just wanting to hear from others if the difference between the two seem right for the differences in psi and if my curves seem to be on par. Thanks.
On the second run the drop in tq was due to the dyno not reading something for a second or so.
Thanks.
Also I have the ARH mids w/cats too.
Also just wanting to hear from others if the difference between the two seem right for the differences in psi and if my curves seem to be on par. Thanks.
On the second run the drop in tq was due to the dyno not reading something for a second or so.
Thanks.
Also I have the ARH mids w/cats too.
Last edited by S'vette; Mar 3, 2017 at 09:17 PM.
Thread Starter
Melting Slicks
Joined: Aug 2010
Posts: 3,063
Likes: 82
From: Tumwater, WA
Oh ok that makes sense. With wheel speed can I still match it up to the other graph that is using rpms? Will the horizontal and vertical marks line up? Thanks.
Melting Slicks
Joined: Aug 2014
Posts: 2,746
Likes: 916
You should be able to overlay them to match things up.
On edit: it appears that the trend lines are slightly different between the two graphs, but looks like you can match things up to be in the ballpark....
On edit: it appears that the trend lines are slightly different between the two graphs, but looks like you can match things up to be in the ballpark....
Last edited by lakemg; Mar 3, 2017 at 11:33 PM.
Le Mans Master
Joined: May 2000
Posts: 8,729
Likes: 1,508
From: Redmond WA
RPM and torque always cross (by the nature of the formula that defines horsepower) at 5252. Since they cross at about 117 on your second chart (which is probably wheel speed) just multiply the bottom axis by 44.8
So, when your horsepower peaks at 128 on the graph, that's about 5750 rpm.
Dave
So, when your horsepower peaks at 128 on the graph, that's about 5750 rpm.
Dave
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
RPM and torque always cross (by the nature of the formula that defines horsepower) at 5252. Since they cross at about 117 on your second chart (which is probably wheel speed) just multiply the bottom axis by 44.8
So, when your horsepower peaks at 128 on the graph, that's about 5750 rpm.
Dave
So, when your horsepower peaks at 128 on the graph, that's about 5750 rpm.
Dave
Thread Starter
Melting Slicks
Joined: Aug 2010
Posts: 3,063
Likes: 82
From: Tumwater, WA
Its driving pretty good now, luv all the low end power too. Its way more fun to play around with now. Initially with the elevation and 91 oct I was losing 2 psi with the 8 psi plate so we drilled a couple holes in the plate per ECS, got the p2227 codes so the car was back at the shop to have the tune looked at and made some adjustments but just couldn't get rid of the code. So a breakout kit was bought and that worked for a couple of days but now the p2227 code is back. So back to the shop next week.
After installing the breakout kit does the tune have to be adjusted again?
Thanks.
After installing the breakout kit does the tune have to be adjusted again?
Thanks.
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