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My 1999 Z28 Dyno & Track Results

Old 01-09-2017, 01:11 PM
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Heads ain't holding him back with what's goin on now. He may be in the right track with his converter tho.
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Old 01-09-2017, 01:23 PM
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Originally Posted by 5LTR ETR View Post
Lingenfelter CNCd 799s Stock Valves 62cc and Peak Speed Ported Dorman LS6 and TB Going On Soon.
We'll see once them heads are swapped, but yes if OP believes theres some converter slip,id bet its certainly affecting the results.
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Old 01-09-2017, 01:47 PM
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Originally Posted by HioSSilver View Post
Heads ain't holding him back with what's goin on now. He may be in the right track with his converter tho.
Would converter slip also cause the terribly low tq on the dyno?
Certainly could be the culprit for the sub par e.t. and mph.
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Old 01-10-2017, 12:36 AM
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Idk......i hate tq converters

If it's not coupled then i could reduce power i suppose. Just turns it to heat. But it would be drastic in his case.
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Old 01-11-2017, 07:41 AM
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Before the PI Vigilante 4000 10.5" Multi Disc and 3.73s the Car Ran a Best of 12.73 @ 111 with a 1.98 60ft with the Stock Converter and 3.23s. After the PI Vigilante 4000 10.5" Multi Disc and 3.73s the Car Ran a Best of 12.23 @ 110 with a 1.68 60ft. IMO It's 1 of 2 Things Short Shifting or Converter Slip, When the Car Trapped 111 Shift Points were Set at 6500, When the Car Trapped 110 Shift Points were Set at 6400, The Car Made Peak Power at 6290 and Starts to Fall Off Drastically After. Should I Raise the Shift Points with Power Falling Off? Should I Command the Converter to Lock Up at WOT?
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Old 01-11-2017, 02:20 PM
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Something is off...should be well into the 11's with a cam and converter. I know two cars that have less cam and less converter that run 11.70's. First thing I would look at is the tune then the transmission.
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Old 01-11-2017, 02:25 PM
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Originally Posted by 5LTR ETR View Post
The K&N FIPK Out Performs the SLP Lid I Had Before. Sway Bar is Removed My Car Only Weighs 3300 with Me In It. I Think My Issue is Converter Slip.
I had the exact opposite when I removed the FIPK.

https://ls1tech.com/forums/generatio...o-talking.html
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Old 01-11-2017, 02:28 PM
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5LTR, are you data logging your runs?..
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Old 01-11-2017, 04:23 PM
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Originally Posted by 5LTR ETR View Post
Before the PI Vigilante 4000 10.5" Multi Disc and 3.73s the Car Ran a Best of 12.73 @ 111 with a 1.98 60ft with the Stock Converter and 3.23s. After the PI Vigilante 4000 10.5" Multi Disc and 3.73s the Car Ran a Best of 12.23 @ 110 with a 1.68 60ft. IMO It's 1 of 2 Things Short Shifting or Converter Slip, When the Car Trapped 111 Shift Points were Set at 6500, When the Car Trapped 110 Shift Points were Set at 6400, The Car Made Peak Power at 6290 and Starts to Fall Off Drastically After. Should I Raise the Shift Points with Power Falling Off? Should I Command the Converter to Lock Up at WOT?
The thing is you should be nearly where your at with no cam and no converter.
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Old 01-11-2017, 09:06 PM
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My old SS was the same way.. heads and cam trapping at 113 scraping 11.99 barely with 1.6 60 ft.. car would feel awesome out of the hole but wouldn't pull hard the rest of the way... never figured mine out but I suspected a bad tune, poor compression in a cylinder, or maybe an intake leak or something.. a few weeks after the track I blew a hole in my piston.. no nitrous or anything.. yours may be different but I suspect something is off or the tracks timers are off lol
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Old 01-11-2017, 09:08 PM
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Just to add, my car did decent on the dyno also and the reputable tuner said my injectors were not maxed.. who knows... I just know it wasn't right somewhere.
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Old 04-06-2017, 04:36 PM
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Old 04-06-2017, 04:45 PM
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Here's an Update Guys, The Stock 853s are Off. The Lingenfelter CNCd 799s are On, Along with GM LS7 Lifters, GM LS2 Lifter Trays, GM MLS Head Gaskets, GM Head Bolts, BTR Titanium 660s & CC 7.375" Pushrods Due to the Heads Being Milled to 62cc. Guesses On Compression, Power, ET & MPH Gains?

Last edited by 5LTR ETR; 04-06-2017 at 04:55 PM.
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Old 04-20-2017, 01:29 AM
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The Lingenfelter LS6 Heads Really Woke Her Up, Shout Out to Z/YA & BilliumSS.
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Old 04-20-2017, 11:17 PM
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Originally Posted by 5LTR ETR View Post
The Lingenfelter LS6 Heads Really Woke Her Up, Shout Out to Z/YA & BilliumSS.
What were the new power #s
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Old 04-24-2017, 03:53 AM
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It was Street Tuned, It Goes On the Dyno May 18th.
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Old 05-04-2017, 08:35 PM
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Better but it should be running faster than that. Could be the converter, maybe the cam...it shouldn't be dropping off that fast after peak HP.

Maybe the Dorman LS6 you have is poorly built and extra restrictive?

I would do a leak down test.

Also, another member had a wonky MAF and after replacing it, he picked up a bunch. Maybe try someone else's MAF to test it out.

https://ls1tech.com/forums/11-second...-11-831-a.html

Good luck!
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Old 06-02-2017, 08:10 PM
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Originally Posted by 5LTR ETR View Post
It was Street Tuned, It Goes On the Dyno May 18th.
Updates?
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Old 06-06-2017, 10:37 AM
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Two things to think about.#1 Condition of your trans. #2 I got that dorman intake and the one I got was junk would never run it on a h/c car now I have a fast 92.
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Old 06-06-2017, 10:39 AM
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Bet she traps 117+ with a fast 92/92
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