Dynojet gives higher numbers don't they? 
Low Dyno #'s, running rich?
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Low Dyno #'s, running rich? So I just got back from dynoing, and was kinda dissapointed. The last time I dynoed was on a mustang dyno with just the 345hp alteration package on my firehawk with a cutout open. I put down 325.5rwhp. This time was on a dynojet, still stock 345hp alteration but through the GMMG catback and the airflow smooth bellow and put down 304.7rwhp. Didn't have A/F on the first time I dynoed, but this last time it was between 11-12 during the run which they told me was a little rich. Also, each time the gragh had little spikes throughout the curve which one guy said was a timing issue?
Basically, can someone tell me what is going on? Are Mustang Dynos known to dyno higher? Is between 11-12 a rich A/F that would cause me to loose 20rwhp? What does the spikeyness mean? Please help! I am fine if my car is actually only making 304.7rwhp, I just want to know what it is actually making!
Here is my dyno chart...any suggestions would be great!
Basically, can someone tell me what is going on? Are Mustang Dynos known to dyno higher? Is between 11-12 a rich A/F that would cause me to loose 20rwhp? What does the spikeyness mean? Please help! I am fine if my car is actually only making 304.7rwhp, I just want to know what it is actually making!
Here is my dyno chart...any suggestions would be great!
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Yeah, and with 12% loss through the M6, 304.7 puts me at about 346hp at the crank. So that makes sense...but that 325.5rwhp from the mustang dyno seems crazy. I knew I wasn't going to gain much/anything from the GMMG because the slp dual/dual flows really well, but I thought I was putting out more than normal...but hey...I guess I am making the 346 at the crank so I am happy.
Now...am I really running rich? And what about the little spikes throughout the curve?
Now...am I really running rich? And what about the little spikes throughout the curve?
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Originally Posted by skytower31
Yeah, and with 12% loss through the M6, 304.7 puts me at about 346hp at the crank. So that makes sense...but that 325.5rwhp from the mustang dyno seems crazy. I knew I wasn't going to gain much/anything from the GMMG because the slp dual/dual flows really well, but I thought I was putting out more than normal...but hey...I guess I am making the 346 at the crank so I am happy.
Now...am I really running rich? And what about the little spikes throughout the curve?
Now...am I really running rich? And what about the little spikes throughout the curve?
Last edited by Revelation222; Feb 22, 2004 at 08:37 PM.
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Well it turns out the place I went before was a dynojet...here is a pic of that graph. Could running a little rich drop me 20rwhp? Could the fact that it was super rainy and wet out have anything to do with it also? Any thoughts would be great! Are some dynos made to put out higher numbers to make people happier? Oh well, this will just make me want to make it faster!
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Originally Posted by skytower31
Well it turns out the place I went before was a dynojet...here is a pic of that graph. Could running a little rich drop me 20rwhp? Could the fact that it was super rainy and wet out have anything to do with it also? Any thoughts would be great! Are some dynos made to put out higher numbers to make people happier? Oh well, this will just make me want to make it faster!
Oh well, this will just make me want to make it faster!I just re-read your first post and you said your first dyno was with the cutout open. Was your highest dyno on Mike's machine with the cutout open as well? If it wasent then I would say thats some of your missing hp right there. GMMG is a high flowing cat back but the cutout should still produce better gains in comparison. I gained 15hp and 15 tq throughout the curve with mine Open FWIW.
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Well, the first dyno I put down 320rwhp through the SLP Dual/dual and 325rwhp through the cutout. So I only gained 5rwhp. So I don't think I would loose 15rwhp by putting on the GMMG compared to the dual/daul, because if anything, it flows as free, if not freer than the slp dual/dual. I do not have the cutout installed on the GMMG system, so I didn't have that option to open it. Quite the mystery...
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Originally Posted by skytower31
Well, the first dyno I put down 320rwhp through the SLP Dual/dual and 325rwhp through the cutout. So I only gained 5rwhp. So I don't think I would loose 15rwhp by putting on the GMMG compared to the dual/daul, because if anything, it flows as free, if not freer than the slp dual/dual. I do not have the cutout installed on the GMMG system, so I didn't have that option to open it. Quite the mystery...
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Originally Posted by skytower31
Well, the first dyno I put down 320rwhp through the SLP Dual/dual and 325rwhp through the cutout. So I only gained 5rwhp. So I don't think I would loose 15rwhp by putting on the GMMG compared to the dual/daul, because if anything, it flows as free, if not freer than the slp dual/dual. I do not have the cutout installed on the GMMG system, so I didn't have that option to open it. Quite the mystery...
What are your plans for the next mod to the engine? That may help you decide what to do about your problem as far as time and cost effeciency goes.
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Originally Posted by jrp
hmm, if theres no timing being pulled cuz of KR, and theres no mechanical problems, then i'd say the differences are just in the dyno calibration, time, and day.
Yeah, what he said. I tryed to get my last post in before you, JRP. But you too quick.
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What do you mean "Timing being pulled"? Sorry, but the technical stuff that goes on regarding timing, KR, and A/F is still kinda out of my league. I know what each individual thing is, but not how moving one way or the other would help/hurt? Also don't know if this would make a difference, but I had to get gas this morning at a different station then I normally go to and this one had just the 1 nozzle for all grades, not 3 seperate nozzles. I have heard you can get up to 3 gallons of the last persons grade when using the 1 nozzle pumps.
Revelation,
I don't know what I want to do next performance wise. I still need to worry about warranty and may be purchasing an extended warranty because this car is my DD. Plus I don't have enough money right now to do anything major. Suggestions would be welcome, but I don't know what I can do for under like $200.
Again, I'm not too worried about it because I know how many variables play into it, espically with dramatically different weather between the 2 times and using two different machines. She still pulls like hell and beats anything out there. I really need to take it to the track and see what is going on there!
Revelation,
I don't know what I want to do next performance wise. I still need to worry about warranty and may be purchasing an extended warranty because this car is my DD. Plus I don't have enough money right now to do anything major. Suggestions would be welcome, but I don't know what I can do for under like $200.
Again, I'm not too worried about it because I know how many variables play into it, espically with dramatically different weather between the 2 times and using two different machines. She still pulls like hell and beats anything out there. I really need to take it to the track and see what is going on there!
as far as timing and KR:
KR or Knock Retard is caused by vibrations in the engine block and detonation. In the event either of these are detected by a knock sensor and a signal is sent to the PCM and the PCM will reduce timing to protect the engine.
Detonation occurs when the air/fuel mixture is compressed and the temperature goes up. The more compression, the higher the temp. At some point, the fuel may spontaneously ignite prior to the spark plug firing. This is detonation and it is very bad for an engine because it often occurs just before the plug fires. You then end up with two flame fronts in the cylinder that crash into each other which can crack pistons and rings, etc.6
Octane is a measure of how much a given blend of fuel resists detonation.
taken from install U
KR or Knock Retard is caused by vibrations in the engine block and detonation. In the event either of these are detected by a knock sensor and a signal is sent to the PCM and the PCM will reduce timing to protect the engine.
Detonation occurs when the air/fuel mixture is compressed and the temperature goes up. The more compression, the higher the temp. At some point, the fuel may spontaneously ignite prior to the spark plug firing. This is detonation and it is very bad for an engine because it often occurs just before the plug fires. You then end up with two flame fronts in the cylinder that crash into each other which can crack pistons and rings, etc.6
Octane is a measure of how much a given blend of fuel resists detonation.
taken from install U
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Originally Posted by skytower31
Revelation,
I don't know what I want to do next performance wise. I still need to worry about warranty and may be purchasing an extended warranty because this car is my DD. Plus I don't have enough money right now to do anything major. Suggestions would be welcome, but I don't know what I can do for under like $200.
I don't know what I want to do next performance wise. I still need to worry about warranty and may be purchasing an extended warranty because this car is my DD. Plus I don't have enough money right now to do anything major. Suggestions would be welcome, but I don't know what I can do for under like $200.
Seriously though, I think you could try the ported MAF ends till you get some big cash. Hell, if they dont work just send em back.
There is also SSRA and the Underdrive Pulley (I dont think GM would have a problem with those) Or if that 200 is burning a hole in your pocket you could go for some more suspention stuff (LCA's, PHB, etc.) Since you dont want to void the warranty, maybe you could get the Hot Cam or some other small cam that they wouldnt notice when you save up a little. 
Originally Posted by skytower31
She still pulls like hell and beats anything out there.
Originally Posted by skytower31
I really need to take it to the track and see what is going on there!
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I was thinking about getting a ported TB that is powdercoated and chromed in certain spots. Right now I am actually kinda working on appearance upgrades especially in the engine cause I kinda want to make her a show and go car eventually. Next month with my mod money I am actually going to detract from performance by adding some sound deadening to the car to kill some drone and help my sub to sound a little better. Since she is my DD, I am trying to make the interior environment as nice a possible...then when the warranty is gone and she is not the DD anymore, then it will be all performance!
Once the weather clears up a bit I would love to head out to the track! The problem is, if it is really crowded and I only get a few passes, it won't really feel worth it because I am sure I will screw most of them up having NEVER raced before and this being my first M6 car! But hey, practice makes perfect. Maybe in a month or two I'll use my mod money to pick up a helmet or that SSRA.
Anyhoots, thanks for all the thoughts and opinions! We need to hang out again soon. This coming weekend I will be gone skiing (the other reason I have no mod money right now!) but the sunday after that, March 7th, we should try to arrange another get together out in Woodland Hills! Catch ya laters.
Once the weather clears up a bit I would love to head out to the track! The problem is, if it is really crowded and I only get a few passes, it won't really feel worth it because I am sure I will screw most of them up having NEVER raced before and this being my first M6 car! But hey, practice makes perfect. Maybe in a month or two I'll use my mod money to pick up a helmet or that SSRA.
Anyhoots, thanks for all the thoughts and opinions! We need to hang out again soon. This coming weekend I will be gone skiing (the other reason I have no mod money right now!) but the sunday after that, March 7th, we should try to arrange another get together out in Woodland Hills! Catch ya laters.
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Originally Posted by skytower31
I was thinking about getting a ported TB that is powdercoated and chromed in certain spots. Right now I am actually kinda working on appearance upgrades especially in the engine cause I kinda want to make her a show and go car eventually. Next month with my mod money I am actually going to detract from performance by adding some sound deadening to the car to kill some drone and help my sub to sound a little better. Since she is my DD, I am trying to make the interior environment as nice a possible...then when the warranty is gone and she is not the DD anymore, then it will be all performance!
Once the weather clears up a bit I would love to head out to the track! The problem is, if it is really crowded and I only get a few passes, it won't really feel worth it because I am sure I will screw most of them up having NEVER raced before and this being my first M6 car! But hey, practice makes perfect. Maybe in a month or two I'll use my mod money to pick up a helmet or that SSRA.
Anyhoots, thanks for all the thoughts and opinions! We need to hang out again soon. This coming weekend I will be gone skiing (the other reason I have no mod money right now!) but the sunday after that, March 7th, we should try to arrange another get together out in Woodland Hills! Catch ya laters.
Once the weather clears up a bit I would love to head out to the track! The problem is, if it is really crowded and I only get a few passes, it won't really feel worth it because I am sure I will screw most of them up having NEVER raced before and this being my first M6 car! But hey, practice makes perfect. Maybe in a month or two I'll use my mod money to pick up a helmet or that SSRA.
Anyhoots, thanks for all the thoughts and opinions! We need to hang out again soon. This coming weekend I will be gone skiing (the other reason I have no mod money right now!) but the sunday after that, March 7th, we should try to arrange another get together out in Woodland Hills! Catch ya laters.
Yea, snow season has eaten up some of my modding funds as well. Im heading up to to Bear again this Friday, should be some nice powder left. The weatherman said they got 9" since yesterday. SCWEEET
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