Dyno Run went bad
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Teching In
Joined: Nov 2006
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Dyno Run went bad Hey so i got a to do a free dyno run today on my Z and it didnt make anything i thought it would. I only made 260hp at 5200 and 280tq at 4000 know these numbers are on a mustang dyno.But right atfer 5300 rpm my power droped and my AFR leaned out to 14.64 and i thought ls1 made its most power at higher rpms. Know about my car its a 99 A4 bone stock stock air lid and filter everythings stock but i did put on a ls6 manfolid off a 01 Z and thats the only thing ive done. it has about 93k on it i bought it with 92k on it so i dont know how good it was taken care of but form how bad shape it was i dont think it was good. I also have C6 vette wheels on it it that would matter. But my qustion is why was it so low we only ran it in 2nd gear they said they usally run it in 3rd. But i plan on moding here in a week but know im wondring if i should get my motor rebuilt or what i should do any help would be great.
i would change the fuel filter and the plugs/wires. yes, those are bad numbers. maybe the dyno was not calibrated correctly. my numbers were not very good either. my 2000 went 314 hp with pacesetters lt's, tsp catted Y, magna flow catback, and a lid.
In an A4, 3rd gear is a 1:1 ratio. Don't ever let a guy do a pull @ a 14.64 A/F ratio during WOT. Your knock sensors were probably pulling timing due to engine knock.
As mentioned, get at least a new fuel filter. Also, get a fuel rail pressure gauge & check the fuel pressure @ idle. It should be 60 psi. Run some Techron injector cleaner through the tank w/ 93 or 94 Octane gas. Then go to a different dyno. The operator should have explained the dangers of going so lean & the likelyhood of lost HP/TQ because of reduced timing. The A/F should be adjusted to 12.9/13.0 during WOT through the RPM range. In your case, the pull should be done in third gear. Once the fuel is properly adjusted, the operator can also increase the timing a bit for even more HP.
If after this, the HP remains low, then consider more drastic changes. While checking the fuel pressure, also remove the oil fill cap during idle. Put your hand over the opening. The engine should be sucking air in. If it's blowing oily air out, there is a bigger problem; maybe cracked cylinder or bad ringlands. Good-luck. My guess is that once the fuel is corrected, you'll be ok.
As mentioned, get at least a new fuel filter. Also, get a fuel rail pressure gauge & check the fuel pressure @ idle. It should be 60 psi. Run some Techron injector cleaner through the tank w/ 93 or 94 Octane gas. Then go to a different dyno. The operator should have explained the dangers of going so lean & the likelyhood of lost HP/TQ because of reduced timing. The A/F should be adjusted to 12.9/13.0 during WOT through the RPM range. In your case, the pull should be done in third gear. Once the fuel is properly adjusted, the operator can also increase the timing a bit for even more HP.
If after this, the HP remains low, then consider more drastic changes. While checking the fuel pressure, also remove the oil fill cap during idle. Put your hand over the opening. The engine should be sucking air in. If it's blowing oily air out, there is a bigger problem; maybe cracked cylinder or bad ringlands. Good-luck. My guess is that once the fuel is corrected, you'll be ok.
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^^^^Couldn't have said it better myself. With an AFR of 14 + during WOT something is definitely up. Either you're not getting enough fuel (filter, pump etc) or your tune is WAY out of wack. Check all the preventative stuff first then see about a tune.
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before you hit the panic button and sell the car always remember mustang dynos show lower numbers, probably 15-20 hp. than a dynajet. a stock 99 a4 should be at 285-295 (maybe 300) on a dynajet. my car club has a mustang dyno day and i've seen a camaro run 271 hp yet on there simmulated 1/4 mile same car ran 13.3! so what i'm saying is check your basic maintainance things then get a tune! my car ran 321 mustang and 336 dynajet (both on mail order tune) then 349 dynajet with DRM tune. hope that helps. just my 2 cents!
TECH Enthusiast
Joined: Feb 2005
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Originally Posted by AznObsession
Hey so i got a to do a free dyno run today on my Z and it didnt make anything i thought it would. I only made 260hp at 5200 and 280tq at 4000 know these numbers are on a mustang dyno.But right atfer 5300 rpm my power droped and my AFR leaned out to 14.64 and i thought ls1 made its most power at higher rpms. Know about my car its a 99 A4 bone stock stock air lid and filter everythings stock but i did put on a ls6 manfolid off a 01 Z and thats the only thing ive done. it has about 93k on it i bought it with 92k on it so i dont know how good it was taken care of but form how bad shape it was i dont think it was good. I also have C6 vette wheels on it it that would matter. But my qustion is why was it so low we only ran it in 2nd gear they said they usally run it in 3rd. But i plan on moding here in a week but know im wondring if i should get my motor rebuilt or what i should do any help would be great.
A stock LS1 will always peak out at about 5400 to 5500 RPM. However, it seems to me that 14.6 is lean for WOT. These cars usually run on the rich side under WOT. Perhaps you can find some more HP. With the LS6 intake you should be making more.
I would simply go to another dyno shop and run it again .
Chances are , if these guys ran your car on the dyno in 2nd gear
they dont have a clue about what they are doing and that could include
setting up the a/f meter .
Dyno it somewhere else ,, then start fixing things if need be .
The 260/280 are useless numbers and are going to be higher in 3rd gear .
Chances are , if these guys ran your car on the dyno in 2nd gear
they dont have a clue about what they are doing and that could include
setting up the a/f meter .
Dyno it somewhere else ,, then start fixing things if need be .
The 260/280 are useless numbers and are going to be higher in 3rd gear .
Tech Resident
Joined: Jan 2006
Posts: 5,117
Likes: 3
From: Philly
i guarantee you a tuneup will do wonders for your car.
change your air filter, fuel filter, plugs and wires, oxygen sensor and SEAFOAM YOUR CAR. it sounds like your car would be an amazing candidate for seafoam. i bet it'll get rid of a lot of pinging and knock retard. consider seafoaming it twice. if you're not familiar with the procedure, here's a tutorial:
https://ls1tech.com/forums/general-maintenance-repairs/534376-how-seafoam-your-car.html
on a side note, you ARE running at least 91 octane in your car, right? because these symptoms could be classic for a guy that fills up an LS1 equipped automobile with 87
it's a mustang dyno. they dyno SIGNIFICANTLY lower than a dynojet. on another note, he has an A4 which sucks up a lot more horsepower, approximately ~15-20 rwhp on a stock car.
change your air filter, fuel filter, plugs and wires, oxygen sensor and SEAFOAM YOUR CAR. it sounds like your car would be an amazing candidate for seafoam. i bet it'll get rid of a lot of pinging and knock retard. consider seafoaming it twice. if you're not familiar with the procedure, here's a tutorial:
https://ls1tech.com/forums/general-maintenance-repairs/534376-how-seafoam-your-car.html
on a side note, you ARE running at least 91 octane in your car, right? because these symptoms could be classic for a guy that fills up an LS1 equipped automobile with 87
Originally Posted by tripps
i am basically stock, just lid, throttle body, FTRA and cutout and i put down 320/325. thats on a 99 M6 with 92k miles. There has to be something up with your car man!!
On The Tree
Joined: Sep 2004
Posts: 159
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From: Cape Coral, Fl
Originally Posted by 5_02ls1
that 2nd gear pull was the problem....every dyno pull should be done in a 1.1 ratio gear...for the a4 that is 3rd an m6 4th....
sounds like the dyno operator is a dumbass
sounds like the dyno operator is a dumbass
TECH Resident
Joined: Nov 2001
Posts: 917
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From: Chattanooga,Tn
mustang dyno's don't show much power but are great to tune on, maybe the operator pulled it in second because your car has a top speed limiter? (assuming you have a 2.73 geared auto and not a 3.23 car-2.73 cars had a steel driveshaft and a lower speed limiter)if so with stock gears it will shut off in third before the run is finished
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^^^^ i dont know the difference between the ls1 and lt1 in transmission(dont think any), but i had a 97 z28 a4 with 2.73s and i didnt have a speed limiter. it was completely stock and i could bury the speedo.... with enough space.
