11-21-2004, 10:43 AM
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#1
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Regular User
Join Date: Oct 2003
Location: Charleston, S.C. USA
Posts: 985
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Why it's good to put your car on a chassis dyno.
So yesterday I go to a local Mustang club event that was holding a dyno day. What that is , is that a bunch of people get together and run their cars on a chassis dyno for the day and have a good time. So, with the little mods that I have on the car I was figuring that I was looking at around 270 hp to the rear wheels. Get on the dyno and found out from the three runs that I made that I was putting out around when the car was stock plus, my torque reading was lower than stock. So I go home and diagnose the problems. Well, one of them is replacing my stock coil packs, according to my chart you can see that there is a little misfire or something after about 5000 rpm's. Second, according to my DTC scanner was that my InterMediate Runner Control (IMRC) system was not opening, which is essentially two plates, one on each side of the bottom of the intakes and has butterfly valves that control the direction of airflow to each individual runner. After 3250 rpm the butterflies open and redirect airflow to the shorter runners which increase upper rpm power. So I essentially have a car that is currently castrated in the upper rpm band and never really knew it until now. So thankfully I can go ahead and rectify the problems. In a sense, it was a good day and a bad day: A bad day because I couldn't get the power that I wanted; a good day because now I can fix it.
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1996 Mustang Cobra. Vortech Kompressor installed.
 Many pilots of the time were the opinion that a fighter pilot in a closed cockpit was an impossible thing, because you should smell the enemy. You could smell them because of the oil they were burning.
Adolf Galland
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11-21-2004, 03:01 PM
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#2
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Regular User
Join Date: Mar 2004
Location: Charleston SC
Posts: 213
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i'd like to dyno my car but i know it will make way less then 240hp, so i'll wait tell i eather get twin turbos, or a supercharger.
Hey Foxfour, what type of car you got?
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11-21-2004, 06:05 PM
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#3
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Regular User
Join Date: Dec 2003
Location: Belgium
Posts: 3,371
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A single dyno test isn't really a very accurate indication of how much power you gained (or lost) when tuning the engine. Cause the specs on the sheet of the car are measured on a test engine according to a certain standard (SAE, DIN, ECE, BHP, CUNA, JIS, etc.). For example when testing according to the SAE standard, the losses for driving the auxiliary parts are not counted in.
If you want to know how much power you've gained by tuning, you'd have to do two dyno runs on the same dyno in approximately the same conditions: one when the engine was stock, and one when the engine is tuned. Only then you’d have an accurate indication of the power gain of tuning. So don't draw fast conclusions out of a single dyno run.
But in your case you can draw conclusions, since you know you have a misfire at 5000 rpm and the valves for the variable intake length system doesn't work properly.
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11-21-2004, 07:18 PM
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#4
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Regular User
Join Date: Oct 2003
Location: Charleston, S.C. USA
Posts: 985
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Originally Posted by Wutputt
A single dyno test isn't really a very accurate indication of how much power you gained (or lost) when tuning the engine.
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Yes, there are limitations because there are many variables that run into the equation, but it also gives you an idea how the engine is running under load. Personally, I like the Mustang Dyno because it simulates road conditions better than the DynoJet model that I used. In this case the printout that I recieved showed me where in the rpm band it started to drop off, and it really started to drop off past 6000 rpm but even with that power loss I could not feel it even on the dyno, it was that imperceptible. Fortunately, my air/fuel ratio was fine, though running a little rich.
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Originally Posted by OVERLORD_CHRIS
i'd like to dyno my car but i know it will make way less then 240hp, so i'll wait tell i eather get twin turbos, or a supercharger.
Hey Foxfour, what type of car you got?
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I own a 1996 Mustang Cobra that has the 4.6 DOHC aluminum block. It puts out 305 hp at the crank stock but with my mods it should be around 320-330 hp. I noticed in one of your posts Chris that you are stationed in Charleston. If you in town sometime I can tell you when the next dynoday the Mustang Club sponsors will be. They do one about every quarter and all makes are welcome.
__________________
1996 Mustang Cobra. Vortech Kompressor installed.
Many pilots of the time were the opinion that a fighter pilot in a closed cockpit was an impossible thing, because you should smell the enemy. You could smell them because of the oil they were burning.
Adolf Galland
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11-22-2004, 02:10 AM
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#5
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Regular User
Join Date: Oct 2004
Location: Phoenix, Arizona
Posts: 419
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If you in town sometime I can tell you when the next dynoday the Mustang Club sponsors will be. They do one about every quarter and all makes are welcome.
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So Would they let my bring my Civic by for few pulls 
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11-22-2004, 03:26 AM
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#6
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Regular User
Join Date: Mar 2004
Location: Charleston SC
Posts: 213
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Originally Posted by FoxFour
I own a 1996 Mustang Cobra that has the 4.6 DOHC aluminum block. It puts out 305 hp at the crank stock but with my mods it should be around 320-330 hp. I noticed in one of your posts Chris that you are stationed in Charleston. If you in town sometime I can tell you when the next dynoday the Mustang Club sponsors will be. They do one about every quarter and all makes are welcome.
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If they don't mind my Lincoln LS being there, i'll take you up on that offer 
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11-22-2004, 07:14 AM
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#7
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Regular User
Join Date: Oct 2003
Location: Charleston, S.C. USA
Posts: 985
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Originally Posted by adamk24
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If you in town sometime I can tell you when the next dynoday the Mustang Club sponsors will be. They do one about every quarter and all makes are welcome.
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So Would they let my bring my Civic by for few pulls |
I think several months ago someone someone brought their old beater and had it dynoed. Put out something like 80 hp.
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Originally Posted by OVERLORD_CHRIS
If they don't mind my Lincoln LS being there, i'll take you up on that offer |
As a matter of fact, there was a Lincoln LS there, don't know if it was getting dynoed but I know it was one of the member's cars. They don't mind what kind of car gets dynoed. The place that hosted it was 'PowerZone Performance' off of Remount Rd.
__________________
1996 Mustang Cobra. Vortech Kompressor installed.
Many pilots of the time were the opinion that a fighter pilot in a closed cockpit was an impossible thing, because you should smell the enemy. You could smell them because of the oil they were burning.
Adolf Galland
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11-22-2004, 01:55 PM
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#8
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Regular User
Join Date: Mar 2004
Location: Charleston SC
Posts: 213
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Remount Rd. i suck at remembering street names but i live off of Dourchester, down Archdale, it should be easy to get to, my freind had a 04 Mustang, we should be able to find it.
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11-22-2004, 08:46 PM
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#9
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Regular User
Join Date: Oct 2004
Location: Chicago
Posts: 1,590
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My friends just use their G-Tec to find out if it's faster or not. They run automatics, so you can only blame the car on a slow time. They tune it then run it on a deserted street, and do it all over. It's a lot cheaper that way.
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"If we could read the secret histories of our enemies, we would find in each story enough sorrow and suffering to disarm all hostility." Longfellow
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11-22-2004, 09:38 PM
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#10
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Regular User
Join Date: Oct 2003
Location: Charleston, S.C. USA
Posts: 985
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I have a G Tech Competition Pro. Around here there are not a lot of places that I can go to that doesn't involve traveling more than 5 miles. I wished I lived in Vegas, there are long flat streets everywhere, not to mention the desert highways. 
__________________
1996 Mustang Cobra. Vortech Kompressor installed.
Many pilots of the time were the opinion that a fighter pilot in a closed cockpit was an impossible thing, because you should smell the enemy. You could smell them because of the oil they were burning.
Adolf Galland
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11-23-2004, 06:03 AM
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#11
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Regular User
Join Date: Oct 2004
Location: Phoenix, Arizona
Posts: 419
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Those Gtech's are actually pretty accurate when compared with other Gtech Runs, however they have a large varriation when compared with chassisdynos. So comparing these two, or more accurately, using a Gtech as a means of getting a HP number to brag about is not a good idea, as the number might be off but it will be the same relative to other pulls. So basically its good for checking what you get from mods, and thats about it. Still good though
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11-23-2004, 08:08 AM
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#12
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Regular User
Join Date: Oct 2003
Location: Charleston, S.C. USA
Posts: 985
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Actually it's just a toy to play around with. My father was an electronics technician so I grew up around all types of electronic do-dads, TV's, boomboxes, shortwave radios, scanners;etc. so it was just another toy for me to play with.
__________________
1996 Mustang Cobra. Vortech Kompressor installed.
Many pilots of the time were the opinion that a fighter pilot in a closed cockpit was an impossible thing, because you should smell the enemy. You could smell them because of the oil they were burning.
Adolf Galland
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11-27-2004, 12:41 AM
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#13
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Regular User
Join Date: Jun 2003
Location: Mesa, AZ
Posts: 647
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i have a few videos of the miata i built on a dyno, it was fun
the g-tech is neat, but never will be as accurate as a good dyno
luckily i just moved to arizona, so right down the road there are 4 tuner shops with dynos =)
the miata was dynod @ flyin miata in grand juction colorado
apexi has a g-tech like device thats pretty cool
__________________
Paul Taylor - ASE Certified Master Mechanic -
2003 Miata SE - 1969 Fiat 850 - 1993 Mustang SSP - Bikeboard K1000, A1000, 1991 Geo Metro, "The Project," A few other things laying around...
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12-30-2004, 03:14 AM
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#14
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Regular User
Join Date: Nov 2004
Location: charleston
Posts: 17
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Originally Posted by OVERLORD_CHRIS
Remount Rd. i suck at remembering street names but i live off of Dourchester, down Archdale, it should be easy to get to, my freind had a 04 Mustang, we should be able to find it.
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im chrs' friend w/ the 04. we have a friend at work who has a '70 mustang and went to the last dyno day i believe. he has a 351 cleveland. he just made the mustang and ford magazine to.
foxfour, where u live, i live behind northwoods mall.
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12-31-2004, 04:36 PM
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#15
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Regular User
Join Date: Oct 2003
Location: Charleston, S.C. USA
Posts: 985
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Originally Posted by ace184
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Originally Posted by OVERLORD_CHRIS
Remount Rd. i suck at remembering street names but i live off of Dourchester, down Archdale, it should be easy to get to, my freind had a 04 Mustang, we should be able to find it.
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im chrs' friend w/ the 04. we have a friend at work who has a '70 mustang and went to the last dyno day i believe. he has a 351 cleveland. he just made the mustang and ford magazine to.
foxfour, where u live, i live behind northwoods mall. |
I saw that car, the white one. I live West Ashley, just off Savannah Hwy.
__________________
1996 Mustang Cobra. Vortech Kompressor installed.
Many pilots of the time were the opinion that a fighter pilot in a closed cockpit was an impossible thing, because you should smell the enemy. You could smell them because of the oil they were burning.
Adolf Galland
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