Please Interpret My Dyno Results
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From: Tyrone, GA U.S.
Great dialogue in this thread from a lot of people more experienced and smarter than me! I appreciate the interchange.
Don's Bolt--I am certain T&J Performance read the A/F from the exhaust tip so I agree with you...the readings would show slightly lean.
Jeff's Bolt--I'm eagerly looking for that printout that reflects 500 rwhp. Oh, and regarding the 03 Cobra owner at the dyno...he was about as nervous as a cat in a room full of rocking chairs. I'll bet he left with
Oh, when is T&J performance customer exclusive track day planned?
Tim--Thanks for keeping my conservative concerns in check. I really didn't want to pull every last bit of hp out of the truck until all the necessary components were there to support it. I also appreciate the care I was given during the dyno time (no defined time limit on the dyno, catching the fact that the fuel was low in the tank, and even the street datalogging afterwards). Incidentally, please remind Winston to forward the results to me. Thanks again!
Dan_03Lightning--Yep, your truck and mine have similar modifications. Regarding the difference the electric fans make versus the stock mechanical...who knows? I don't have before and after results.
Ub2slow--It is a stock block.
Don's Bolt--I am certain T&J Performance read the A/F from the exhaust tip so I agree with you...the readings would show slightly lean.
Jeff's Bolt--I'm eagerly looking for that printout that reflects 500 rwhp. Oh, and regarding the 03 Cobra owner at the dyno...he was about as nervous as a cat in a room full of rocking chairs. I'll bet he left with
Oh, when is T&J performance customer exclusive track day planned?Tim--Thanks for keeping my conservative concerns in check. I really didn't want to pull every last bit of hp out of the truck until all the necessary components were there to support it. I also appreciate the care I was given during the dyno time (no defined time limit on the dyno, catching the fact that the fuel was low in the tank, and even the street datalogging afterwards). Incidentally, please remind Winston to forward the results to me. Thanks again!
Dan_03Lightning--Yep, your truck and mine have similar modifications. Regarding the difference the electric fans make versus the stock mechanical...who knows? I don't have before and after results.
Ub2slow--It is a stock block.
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Joined: Aug 2002
Posts: 285
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From: Buford Ga
Gary
You are always Great to talk to in person!! Me and Tim talking
about your trucks Has put my back in the GAME. I Want To MOD
my Truck now
. So I hope I have some self contoll.
If you can We( Me & TIM) will be at the dyno Sunday working
on so TRICK STUFF
Stop by.
JEFF
You are always Great to talk to in person!! Me and Tim talking
about your trucks Has put my back in the GAME. I Want To MOD
my Truck now
. So I hope I have some self contoll.If you can We( Me & TIM) will be at the dyno Sunday working
on so TRICK STUFF
Stop by.JEFF
Last edited by Jeff's Bolt; Sep 28, 2003 at 07:59 AM.
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From: Hammer Lane
Originally posted by tommylightning
looks lean and also down on power in the lower RPM range. I would suggest getting some 255 fuel pumps to replace the stockers.
looks lean and also down on power in the lower RPM range. I would suggest getting some 255 fuel pumps to replace the stockers.
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From: All over the US
Originally posted by Jeff's Bolt
This is Tim,
It will be richer with the adapitve strategies I use on the reflash.The load on a dyno is less then on the street.Gary' truck is set to richen up a certain percent based on load and exhaust temps.I'll gladly put a wide ban in the truck to prove it.
We always see atleast a .05 drop in A/F on the street verses the dyno using a reflash.
If Gary beats on his truck repeatedly and exhaust temps get to high,it will dump alot of fuel in to keep it safe.He can attest to this.It did it to him after a few high speed blast.I do alot of this,and we test alot on the street after a dyno..We always have the same results.
Dont take my word for it ..Call and talk to Mike Morella @ Steeda.They also do alot of reflashing and see the exact same results.They will set a supercharged GT @ 12.5 on the dyno so its in the 11's on the street.We have worked with them extensively on reflash technology to optimize results.
FWIW,there are over 500 supercharged GT's currently using this technology and no motors have ever been lost.
Tim
This is Tim,
It will be richer with the adapitve strategies I use on the reflash.The load on a dyno is less then on the street.Gary' truck is set to richen up a certain percent based on load and exhaust temps.I'll gladly put a wide ban in the truck to prove it.
We always see atleast a .05 drop in A/F on the street verses the dyno using a reflash.
If Gary beats on his truck repeatedly and exhaust temps get to high,it will dump alot of fuel in to keep it safe.He can attest to this.It did it to him after a few high speed blast.I do alot of this,and we test alot on the street after a dyno..We always have the same results.
Dont take my word for it ..Call and talk to Mike Morella @ Steeda.They also do alot of reflashing and see the exact same results.They will set a supercharged GT @ 12.5 on the dyno so its in the 11's on the street.We have worked with them extensively on reflash technology to optimize results.
FWIW,there are over 500 supercharged GT's currently using this technology and no motors have ever been lost.
Tim
how you use the rear 02's as a EGT? Does using the post cat 02's as EGT's kill the ability for the computer to run the Cat monitor test?
For those of you who dont know, the post cat 02's , or rear 02's arent supposed to switch from rich to lean, they are only their to ensure that the cat is doing its job, they dont fluctuate voltage like the front 02's do.
You are aware that the outlet temp of the converter(s) is higher than the inlet because of the chemical bonding of the 02 molecules to the H and C molecules, so using the rear 02's as EGT's is kinda confusing to me.
Dont forget kids, Lean does not equal HOT past the cylinders or manifolds.
no flame intended, just looking for some clarification on what your saying. Thanks
GOVERNMENT WARNING
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From: All over the US
Originally posted by Grey03
Can you clarify, Jeff or Tim how you use the rear 02's as a EGT?
Does using the post cat 02's as EGT's kill the ability for the computer to run the Cat monitor test?
For those of you who dont know, the post cat 02's , or rear 02's arent supposed to switch from rich to lean, they are only their to ensure that the cat is doing its job, they dont fluctuate voltage like the front 02's do.
You are aware that the outlet temp of the converter(s) is higher than the inlet because of the chemical bonding of the 02 molecules to the H and C molecules, so using the rear 02's as EGT's is kinda confusing to me.
Dont forget kids, Lean does not equal HOT past the cylinders or manifolds.
no flame intended, just looking for some clarification on what your saying. Thanks
GOVERNMENT WARNING
Can you clarify, Jeff or Tim
how you use the rear 02's as a EGT? Does using the post cat 02's as EGT's kill the ability for the computer to run the Cat monitor test?
For those of you who dont know, the post cat 02's , or rear 02's arent supposed to switch from rich to lean, they are only their to ensure that the cat is doing its job, they dont fluctuate voltage like the front 02's do.
You are aware that the outlet temp of the converter(s) is higher than the inlet because of the chemical bonding of the 02 molecules to the H and C molecules, so using the rear 02's as EGT's is kinda confusing to me.
Dont forget kids, Lean does not equal HOT past the cylinders or manifolds.
no flame intended, just looking for some clarification on what your saying. Thanks
GOVERNMENT WARNING
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Joined: Jul 2003
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From: Grand Prairie, TX
In reference to the E-fan...My particular application picked up 15rwhp and 30rwtq...no *****. It picked up about 1-2 tenths and 1.5-2mph in the 1/4. I've had mine for right at a year now. It is just a great mod IMHO. In terms of efficiency, and it's ability to cool the truck down b/w runs at the track. Worth every red cent. Now that I have the KB, it just seems to help that much more. Good Luck with your combo 
Later,
Rob
Later,
Rob
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From: Buford Ga
I use it as a safety measure.Its not used as a tuning tool.We allow the rear 02's to add fuel as a safety measure.If you go out and beat on your truck repeatedly,rear 02's hit the preset limit on exhaust temp and add fuel...
Ask Gary,his truck went limp after 5 or 6 hard blast.I do it to keep a retarded owner from blowing his truck or car up..
Tim
Ask Gary,his truck went limp after 5 or 6 hard blast.I do it to keep a retarded owner from blowing his truck or car up..
Tim
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From: Plymouth, MI
The CMS sensors don't measure temp. There is a "model" in the factory calibration which estimates exhaust temps based on time at load, etc. The PCM will kick into "cat cooling" mode if it thinks the exhaust temps have gone too high. It will dump in fuel to use up all the excess oxygen in the cats. The cats will cease to function for a short time and the temps will drop, keeping the cats from melting into puddles.
This "model" is no longer valid once major mods have been made. A tuner should be able to turn this function off.
This "model" is no longer valid once major mods have been made. A tuner should be able to turn this function off.
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From: All over the US
Originally posted by lurker
The CMS sensors don't measure temp. There is a "model" in the factory calibration which estimates exhaust temps based on time at load, etc. The PCM will kick into "cat cooling" mode if it thinks the exhaust temps have gone too high. It will dump in fuel to use up all the excess oxygen in the cats. The cats will cease to function for a short time and the temps will drop, keeping the cats from melting into puddles.
This "model" is no longer valid once major mods have been made. A tuner should be able to turn this function off.
The CMS sensors don't measure temp. There is a "model" in the factory calibration which estimates exhaust temps based on time at load, etc. The PCM will kick into "cat cooling" mode if it thinks the exhaust temps have gone too high. It will dump in fuel to use up all the excess oxygen in the cats. The cats will cease to function for a short time and the temps will drop, keeping the cats from melting into puddles.
This "model" is no longer valid once major mods have been made. A tuner should be able to turn this function off.
Do you also expand the MAP's in this reflash?
THANKS
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From: Plymouth, MI
The O2 signals aren't used for the model. As I understand it, it's based on load (from the MAF signal), spark timing, and the AFR the PCM is asking for. Obviously, the length of time at various conditions enters into the whole thing. I believe the worst case is constant high load, retarded spark, and lean. This dumps lots of heat and quite a bit of oxygen to the cats. Factory calibrations at WOT tend to be rich enough to avoid problems, but chips and reflashes can be very different.
Or I could have it all wrong...
Or I could have it all wrong...