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Dynoing - Quarter Million Mile stock LS1 02 Z28 Today: Guess hp & torque?

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Dynoing - Quarter Million Mile stock LS1 02 Z28 Today: Guess hp & torque?

Old 01-11-2019, 07:27 AM
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Default Dynoing - Quarter Million Mile stock LS1 02 Z28 Today: Guess hp & torque?

Dynoing almost Quarter Million Mile stock LS1 02 Z28. Had to go for the catcher title...wink
​​​​​​
Should have results to post by 5 pm today. Though a few folks might be interested.

02 Z28, A4, 2.73's - stock, 100% original, 245,700 miles.

Condition, cold car has piston slap, gets 27,5 mpg highway and was well maintained by prior owner with regular maintenance.

Guess hp & torque? Will the 4L60e survive?
All guesses & comments welcome.


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Old 01-11-2019, 07:41 AM
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Going to guess 293/308, give it hell.
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Old 01-11-2019, 08:12 AM
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290/310
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Old 01-11-2019, 09:53 AM
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Z28 is at RPM Performance in Indianapolis at the moment.

The dyno is a Dynomite

Shop says the dyno will read lower than a DynoJet.


Last edited by 99 Black Bird T/A; 01-14-2019 at 08:31 AM.
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Old 01-11-2019, 10:41 AM
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300/325. Have fun!
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Old 01-11-2019, 12:23 PM
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Hunter the Golden retriever was the entertainment committee.

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Old 01-11-2019, 12:52 PM
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My 223k mile stock 1998 with lid, cat back, big converter and 9 inch rear dynoed 285 hp at 5700 rpm.

I guess 300 hp for yours. Good luck.
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Old 01-11-2019, 12:56 PM
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I'll go with... 277hp/289tq. Good luck.
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Old 01-11-2019, 04:31 PM
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Hunter had a purpose.... keeping the dyno operator honest! LOL Sure, he ACTED like he was playing with the ball, but he was WATCHING....
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Old 01-11-2019, 05:45 PM
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297/307
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Old 01-11-2019, 09:07 PM
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Not being familiar with the Dyno Dynamics Dynomite I asked what do stock LS1 cars typically dyno. The operator said the DD reads lower than a DynoJet or Mustang are known as Heart Breakers. He said his low mile 2000 SS Camaro made 230 wheel horsepower on this dyno.

Spoiler!


​​​
mite

Before he handed me the graphs the operator asked what I expected. I said miles, age on the car on DynoJet I'd guess ~275 whp, 300 wtq.

I said, "On this heart breaker DD - 255whp & 280 wtq."

Thinking that's a low ball number and an LS1 will probably dyno like an 93-97 LT1 on this dyno.

The results below...

Spoiler!


​​​​​


This was the first time I've signed a wavier before having a car dyno'd. The Z28's been well maintained.

Detailed printout listing weather conditions and correction factors. The 3rd pull was the best one and is posted below.




I asked if they noticed any issues etc. The operator said no other than a rattle that started around 5,000 rpm. Being at the rear of the car, I didn't hear any detonation and asked on seeing 14.5 AF if the car was too lean. He said being a couple of few from the engine it sounded more like possible timing chain rattle.
​​​
Fuel filter is fresh so prepares the fuel pump isn't holding pressure.

Last edited by 99 Black Bird T/A; 01-14-2019 at 08:30 AM.
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Old 01-11-2019, 09:27 PM
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Timing chain rattle (IF that's what he heard...) could make cam timing jump around, though to what effect on power....????
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Old 01-11-2019, 10:16 PM
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The black smoke seems a bit high at first WOT and then goes white to black for awhile. Just a guess that your A/F is jumping around a bit during that process which prolly isnt best for peak numbers. Also 14.5 at WOT is pretty lean if that is accurate reading..
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Old 01-11-2019, 11:05 PM
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Definitely a lot of smoke etc.

The timing chain was replaced by the previous owner at ~174,000 miles so the timing chain has ~72,000 mile, that's not really excessive. Probably an inexpensive replacement chain and maybe the original gear set. Will add new timing set & TR-55's to list.




Dyno result ​​​​​​AF of 14.5 + rattle probably means lean and pinging. I've not heard the car ping the few times the Z29 has hit 5,500 rpm.

Probably need to check the fuel pressure etc maybe the fuel pump is getting weak.

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Old 01-11-2019, 11:41 PM
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Ya check fuel pressure and front O2 sensors. Seems its burning some oil but thats to be expected. Hopefully a few tweaks will get you up to the 275-280 range where it belongs.. Checking your A/F with wideband and any possible knock sensor readings that might be pulling timing should help too.
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Old 01-12-2019, 12:17 PM
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Originally Posted by 99 Black Bird T/A View Post
...

Dyno result ​​​​​​AF of 14.5 + rattle probably means lean and pinging. I've not heard the car ping the few times the Z29 has hit 5,500 rpm.

Probably need to check the fuel pressure etc maybe the fuel pump is getting weak.
How loud was the pinging? Was it easily audible from a distance?

Thanks,
Andy
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Old 01-12-2019, 07:47 PM
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At the dyno, I didn't hear ping. Driving the car haven't hear any ping.
The operator was close to the front of the car in a good place to hear it.
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Old 01-13-2019, 10:10 PM
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Just so you know that is not a Dyno Dynamics dyno which typically do read 10-14% lower than a Dynojet. That is a Dynomite dyno which can read all over the place. I'd also be concerned about that lean of an afr at full throttle. Checking fuel pressure under load would be a good idea.
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Old 01-14-2019, 08:27 AM
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Originally Posted by vw1320 View Post
Just so you know that is not a Dyno Dynamics dyno which typically do read 10-14% lower than a Dynojet. That is a Dynomite dyno which can read all over the place. I'd also be concerned about that lean of an afr at full throttle. Checking fuel pressure under load would be a good idea.
Thank you for pointing that out. I was positive the operator said Dyno Dynamics when we were talking. Looks like a hearing aid needs to go on my mid list too!
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Old Yesterday, 06:04 PM
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14.5 is pretty damn lean considering those things run low 12's bone stock.

I would be doing a bunch of checking before I beat on it again.

Did he happen to log it when he pulled it?

I would also asked him the last time he calibrated his WB02 and if it's working properly.

I'm kinda suspect how it held 14.5 the ENTIRE run and didn't swing one way or the other.

When WB02's go out, they always show lean because of the design of the pump cell in the sensor.

I'm actually surprised he finished the pull. If I would have pulled it and saw 14.5 on the WB I would have stopped. If the WB was reading accurate I would have declined to make anymore pulls.

It's not worth the risk blowing someones car up because you know the guy pulling the car is going to get blamed somehow.

Just my .02

Last edited by LilJayV10; Yesterday at 06:46 PM.
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