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tips, technology, tools and techniques related to vehicle driveline components

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IaTR6
Dennis Costello
Central Iowa
(169 posts)

Registered:
12/29/2007 02:53PM

Main British Car:
'73 TR 6 '97 Explorer 5.0

interpret torque trace from dyno run
Posted by: IaTR6
Date: October 01, 2020 05:40PM

never mind, I can't attach the pdf
Dennis



Edited 1 time(s). Last edit at 10/01/2020 05:42PM by IaTR6.


donkelly23
Don Kelly
Charleston, SC
(130 posts)

Registered:
07/21/2011 05:13PM

Main British Car:
1980 TR7 V8 Z28 FI ECM 4.0

Re: interpret torque trace from dyno run
Posted by: donkelly23
Date: October 01, 2020 05:55PM

Copy to a jpg


IaTR6
Dennis Costello
Central Iowa
(169 posts)

Registered:
12/29/2007 02:53PM

Main British Car:
'73 TR 6 '97 Explorer 5.0

Re: interpret torque trace from dyno run
Posted by: IaTR6
Date: October 05, 2020 03:37PM

I think I can.....So, is it possible this shows the shifting of the gears? I thought the trace was only started when
the vehicle was in the gear for the test. What do you think?
Hey Carl-Thanks for your kind offer! I'm so incompetent, I'm sure there will be something else.
Dennis
Dyno-test copy.jpg


minorv8
Jukka Harkola

(208 posts)

Registered:
04/08/2009 06:50AM

Main British Car:
Morris Minor Rover V8

Re: interpret torque trace from dyno run
Posted by: minorv8
Date: October 07, 2020 02:23AM

No gear changes, continuous pull on high gear.


88v8
Ivor Duarte
Gloucestershire UK
(804 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: interpret torque trace from dyno run
Posted by: 88v8
Date: October 07, 2020 04:20AM

OK, so silly question I never thought of, what if it's an auto? How does that work?

Ivor


IaTR6
Dennis Costello
Central Iowa
(169 posts)

Registered:
12/29/2007 02:53PM

Main British Car:
'73 TR 6 '97 Explorer 5.0

Re: interpret torque trace from dyno run
Posted by: IaTR6
Date: October 07, 2020 10:32AM

I believe this is a continuous pull in a direct drive gear, although I have seen it done in a lower gear. The question,
is why the roller coaster trace in the
lower rpm? I question things like accelerator pump, power valve, and transition
to the secondaries of the four barrel.
As to automatics, I haven't thought about that. I do know that the dyno operator I watched earlier this year
would pull traction control fuses on the newer cars to keep it from activating.
Anyway, I'm just curious-of course, that supposedly killed the cat, so I should be careful!
Dennis


roverman
Art Gertz
Winchester, CA.
(3061 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: interpret torque trace from dyno run
Posted by: roverman
Date: October 07, 2020 04:37PM

I would look at BSFC/ air-fuel data log, throughout the pull, also timing ? Electronic inj. ? Exhaust temps ?



88v8
Ivor Duarte
Gloucestershire UK
(804 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: interpret torque trace from dyno run
Posted by: 88v8
Date: October 08, 2020 04:33AM

Yes, perhaps this is what one gets with an 'out of the box' setup that hasn't had dyno time to tune the carb/ign properly.

Over here in the UK, I often see Rover V8s with the Edelbrock 500, if I ask the owners how much dyno time they needed to set it up properly they just look at me.

And the same with sidedraught Webers. People want the bling, but won't pay to make it work properly.

Ivor


IaTR6
Dennis Costello
Central Iowa
(169 posts)

Registered:
12/29/2007 02:53PM

Main British Car:
'73 TR 6 '97 Explorer 5.0

Re: interpret torque trace from dyno run
Posted by: IaTR6
Date: October 08, 2020 10:57AM

I'm going to try for more information on the engine. All I know right now is that it would
be considered old-school hotrod ding. 351 Ford, bored and stroked to 408. Single four barrel
(Holley I think) of unknown cfm, alum heads, uprated cam. Apparently the owner sent the original
engine to a builder, and offered up the intended use, and the builder went from there.
No dyno time prior to this run, so tweaking of timing, jets etc has not been done.My original
curious question was regarding the up and down curve, not having seen anything like that before.
I'll tget more info and get back-it's just a mind exercise!
Dennis


roverman
Art Gertz
Winchester, CA.
(3061 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: interpret torque trace from dyno run
Posted by: roverman
Date: October 08, 2020 05:02PM

We certainly have people here, skilled in Holley set-ups ? I wonder about power valve function and vacum secondaries ?
Not Holley skilled, Art.


MGBV8
Carl Floyd
Kingsport, TN
(3991 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB, Buick 215

authors avatar
Re: interpret torque trace from dyno run
Posted by: MGBV8
Date: October 08, 2020 05:43PM

Quote:
Over here in the UK, I often see Rover V8s with the Edelbrock 500, if I ask the owners how much dyno time they needed to set it up properly they just look at me.

I used an Innovate O2 tailpipe sniffer with 12-14 inch extension to get it farther into the exhaust pipe.


IaTR6
Dennis Costello
Central Iowa
(169 posts)

Registered:
12/29/2007 02:53PM

Main British Car:
'73 TR 6 '97 Explorer 5.0

Re: interpret torque trace from dyno run
Posted by: IaTR6
Date: October 15, 2020 10:55AM

Well, I am now sorry I started this thread, as I cannot get enough information on the engine.
All I can find out is it is supposed to be a Ford 351 bored and stroked to 408.
It has Flotech heads (which ones?), A Holley "Brawler" carb (how many cfm?). Beyond that - nothing!
A fine example of someone going to an "engine builder", and saying: I want a hot rod engine. What
you get is a mystery after that. You might get a runner, or a dog, and only chance determines the outcome.
Could some dyno time researching the ignition and fuel system to unlock the actual potential? I would
think so, but I'm guessing that may not happen. There was no A/F recorded, the dyno operator asked if
the owner wanted that, but apparently the owner didn't recognize the value. I asked about the carb secondaries,
and he was too afraid of the engine exploding to be that close! I'm frustrated to say the least. The owner should be in possession of
a list of all the components in the engine. If not, I become very suspicious!
I originally thought this would develop into a conversation on technical aspects of tuning, and it fell off a cliff - Sorry!
Dennis


MGBV8
Carl Floyd
Kingsport, TN
(3991 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB, Buick 215

authors avatar
Re: interpret torque trace from dyno run
Posted by: MGBV8
Date: October 16, 2020 11:52AM

It takes more that just slapping parts together. It's not just chance. They need to work well together & match the application.

IMO, it should be making more like 400 RWHP. May not can do it with tuning since you don't really know anything about the internals of the engine. If you aren't happy with the power, tear it down & see what you have inside. Then, you can compare some magazine builds to see what combination of parts will deliver what you want


DiDueColpi
Fred Key
West coast - Canada
(1267 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
What if the Hokey Pokey really is what it's all about?

authors avatar
Re: interpret torque trace from dyno run
Posted by: DiDueColpi
Date: October 16, 2020 10:22PM

I'm going to go with wheel spin on the dyno.
Torque was 350ish @ 1600 rpm and maxed @ 372 @ 3500 rpm.
Doesn't compute to me.
Could have been a lot of other reasons but that run should go in the dumpster.
Cheers
Fred


IaTR6
Dennis Costello
Central Iowa
(169 posts)

Registered:
12/29/2007 02:53PM

Main British Car:
'73 TR 6 '97 Explorer 5.0

Re: interpret torque trace from dyno run
Posted by: IaTR6
Date: October 17, 2020 01:06PM

Oh criminy!! I now realize that the obvious bit of information that I left out was that this isn't mine!
Dang. It belongs to a cousin of mine who I thought was more savvy than to just ask for an engine build without knowing
what to ask for. This is HIS dyno run, and i am not competent enough to interpret what went on, and
thought I would ask all of you. What transpired was that he doesn't know what he has, and without that information, it's just a waste.
And because of that, I wasted your time, and I'm sorry for that. I know all of you like a good challenge, and that
shows in your interest in my question.
I hope that the next time I ask something it will include all the pertinent details.
Thanks again,
Dennis



roverman
Art Gertz
Winchester, CA.
(3061 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: interpret torque trace from dyno run
Posted by: roverman
Date: October 19, 2020 12:46PM

I don't consider a waste of my time, keeps my gray matter out of cobwebs/lol. Did anyone mention potential of "wheelspin", on chassis dyno ?
Art.


MGBV8
Carl Floyd
Kingsport, TN
(3991 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB, Buick 215

authors avatar
Re: interpret torque trace from dyno run
Posted by: MGBV8
Date: October 19, 2020 03:58PM

Yep. Fred Key did a few days ago.


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