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1 in a 1000 - High Mile 02 Z28's new lease on life as daily driver

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1 in a 1000 - High Mile 02 Z28's new lease on life as daily driver

Old 12-08-2018, 01:46 AM
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Originally Posted by Kcutty85 View Post
Any fitment issues with the intake? Also the website is a little confusing is the price $390 for the porting and them to mold the snout on? Got any more pics by chance?
The Peak Ported 90mm LS6 on my 91 RS fit perfectly.No issues or problems. It's been on the car for two and a half years and about 8,000 miles.

The core for this 2nd Peak Ported 90mm LS6 came from my 99 TA's heads & cam package. No issues.

Two steps involved with two different shops One with Lingenfelter Performance Engineering and the other with Peak Speed Shop.

The 90mm snout was done via Lingenfelter Performance Engineering. I'm not sure if they do it in house or send the LS6 intake to TPiS. The old snout is cut off of the intake and they new amount glued onto the intake. There are also four screws that attach the snout. Cost $350 plus shipping. You supply the LS6 intake.

I will take more more pictures tomorrow.

The porting was done by Peak Speed Shop. I choose the radical port which was about $400.
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Old 12-11-2018, 08:14 PM
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Originally Posted by 99 Black Bird T/A View Post
The Peak Ported 90mm LS6 on my 91 RS fit perfectly.No issues or problems. It's been on the car for two and a half years and about 8,000 miles.

The core for this 2nd Peak Ported 90mm LS6 came from my 99 TA's heads & cam package. No issues.

Two steps involved with two different shops One with Lingenfelter Performance Engineering and the other with Peak Speed Shop.

The 90mm snout was done via Lingenfelter Performance Engineering. I'm not sure if they do it in house or send the LS6 intake to TPiS. The old snout is cut off of the intake and they new amount glued onto the intake. There are also four screws that attach the snout. Cost $350 plus shipping. You supply the LS6 intake.

I will take more more pictures tomorrow.

The porting was done by Peak Speed Shop. I choose the radical port which was about $400.
Damn you have more in that ls6 intake than I do in my ported fast 102 lol
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Old 12-11-2018, 10:29 PM
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LOL! Indeed the Peak Ported LS6 90mm snout intake is the most expensive part for car at this point. One is on my 91RS. Tuning available, keeping stock drive ability, I'm happy with the pricey tweaked LS6. Drive ability critical since fiance sometimes drives the Z28.

The Fast 102 LSXRT on the 383 LS1 was a nightmare. The Fast 102 LSXR on the 416 drives pretty good overall. She doesn't like driving the 416 says it's a handful. I couldn't talk my friend out of his Fast 90 wink.

This will probably become a "clean the garage out" use stuff laying around build



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Old 12-12-2018, 05:05 AM
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I enjoyed reading about your 2002. I also have a 2002 Z28 that I bought brand new. It's got 118,000 miles on it but it drives like new. It is also a n/A 10 second Hellcat and z06 eater. If they are taking care of they will last.
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Old 12-12-2018, 08:22 AM
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Bo Duke, that sounds like a fun ride! I agree when the LS1 4th Gen's are taken care of they hold up very well. Thank you for the comments
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Old 12-28-2018, 12:09 AM
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Wow kudos!
cant wait for more Ofcourse .

I was just telling someone that fbodies seem to only have two roles now . All out race cars modded and beat to hell or shiny garage queens.
Good to see a clean cruiser with some muscle.
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Old 01-07-2019, 07:26 PM
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Bad 408, that's well said - probably the main reason I bought the Z28 despite the high miles. Seems like most of these cars are moving away from the driver/crusier role to race race, parts car or beater.

Project is moving along very slowly. The GMPP/LPE ported 243 heads are at Land Speed Cylinder Heads getting more bowl work and valve job revised for better mid-lift flow.


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Old 01-07-2019, 09:14 PM
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Thank you for keeping her in good condition!!
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Old 01-08-2019, 12:06 AM
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Originally Posted by 99 Black Bird T/A View Post
Bad 408, that's well said - probably the main reason I bought the Z28 despite the high miles. Seems like most of these cars are moving away from the driver/crusier role to race race, parts car or beater.

Project is moving along very slowly. The GMPP/LPE ported 243 heads are at Land Speed Cylinder Heads getting more bowl work and valve job revised for better mid-lift flow.


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I need brett to do a set for me . Love his work
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Old 01-09-2019, 08:25 PM
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Mavn, I think you'll find that a rewarding call. I'm a fan of Brett's cylinder head work and knowledge. Brett's outstanding at cylinder head development. He has an outstanding background in successful endurance racing with a proven winner, Katech. Lot of the road race folks around Indianapolis and other places pick his cylinder heads for the excellent power, high quality components and proven durability.

When he saw the intake port on this set, he's said I've worked with those ports at Katech. It's the ~250cc intake port from the Cadillac/Corvette racing program Lingenfelter Performance Engineering helped sponsored back in the early 2000's.

Minor Update - 02 Z28 gets baseline dyno on Friday. For kicks thought it would be fun to dyno a 100% stock & original Z28 with 245,500 mile on the drive line.

Maybe a few bolt-on's and dyno later if the 4L60e survives the experience in the spring. The plans for new engine are very slowly coming along.

Long term - SBE LS2 iwith the GMPP's blessed by Brett. Small chance of a 402 stroker.
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Old 01-10-2019, 11:00 AM
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I can’t wait to see the stock numbers for that mileage!!
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Old 01-11-2019, 11:26 PM
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Thank you, I appreciate everyone that took time to read and look at this thread

Today proved interesting:
  • dyno'd the car
  • clueless cellphone user in a SUV nearly side swiped Z28 on the interstate
  • Passed on $1,250 profit above parts, maintenance, insurance & cost of the car.
  • day ended with putting the Z28 away in for the winter as 7 inches of snow are forecast.
Dyno'd the Z28 at RPM Performance in Indianapolis today. Nice shop and professional folks. Happy with the experience. ​​​​​Not being familiar with the Dynomite, I asked what do stock LS1 cars typically dyno. The operator said this Dynomite reads lower than a DynoJet or Mustang. He said his low mile 2000 SS Camaro made 230 wheel horsepower on this dyno.

Spoiler!


Video of 3rd pull.

​​​

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 his 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 the 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 perhaps the fuel pump isn't holding pressure. Need to check the fuel pressure etc maybe the fuel pump is getting weak.

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.



I'm grateful the previous owner shared his 13 years of maintenance records.

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.

May do a new baseline in the spring on a DynoJet that I'm familiar with and know what to expect. It started snow tonight so once again the 02 Z28 is put away in the garage for winter. It was nice to have a lot of rain earlier to wash away the salt followed by few weeks of good weather. I'm usually stuck driving my truck in January. Definitely sweet to get to drive the Z28 in January for a whole week

Last edited by 99 Black Bird T/A; 01-14-2019 at 08:34 AM.
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Old 01-12-2019, 07:22 PM
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Originally Posted by 99 Black Bird T/A View Post
LOL! Indeed the Peak Ported LS6 90mm snout intake is the most expensive part for car at this point. One is on my 91RS. Tuning available, keeping stock drive ability, I'm happy with the pricey tweaked LS6. Drive ability critical since fiance sometimes drives the Z28.

The Fast 102 LSXRT on the 383 LS1 was a nightmare. The Fast 102 LSXR on the 416 drives pretty good overall. She doesn't like driving the 416 says it's a handful. I couldn't talk my friend out of his Fast 90 wink.

This will probably become a "clean the garage out" use stuff laying around build



​​​​​​
Did they ever send you pictures of where they cut it off or can you clearly tell on yours? If so, can you post them up?
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Old 01-12-2019, 08:01 PM
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Not bad numbers considering the millage! I enjoy reading your posts .
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Old 01-12-2019, 08:04 PM
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Assuming a 20% drivetrain loss for automatics, that puts you right at 306 rwhp, which is the factory rating. (305 factory).
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Old 01-13-2019, 01:49 PM
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Thank you Nathan, happy to to share what's going on with the high mile daily Z28. It's possible the 4L60e is tired and slips some in the upper rpm for a ~ 20% loss.

In 2002, long ago, dyno'd my 91 RS with a 305 TBI 305 V8, 700R4, 2.73's at 229,000 miles. The old 305 was rate a whopping 170 hp 250 tq. The car dyno'd 133 whp & 220 wtq.
The hp was down 22% the torque was only down 12%.

I expected the Z28's hp to be down some and the torque to be about normal or a little higher like the RS.

May be a round of couple of bolt-on's and a return to the same dyno is in order and to see what gains occur after the fuel pressure is checked. I think new plugs, wires, cleaning the MAF, a real GM AC/Delco X66P decarbon treatment are all a good idea.
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Old 01-13-2019, 01:56 PM
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Originally Posted by King Nothing View Post

Did they ever send you pictures of where they cut it off or can you clearly tell on yours? If so, can you post them up?
Sure, Here are a few pictures of the snout area. Looks like an LS2 snout maybe. A little black paint on the screw heads and they won't be as noticeable. I think the 90mm LS6 makes a fun street intake for reasonable cost if you have an LS6 intake on hand.

For 6,500 rpm + there are better choices. I also like the Fast 90/92's and 102's or MSD on bigger engines or high rpm set ups. If your an outstanding tuner or know one, the 102 stuff might drive OK on a smaller cube engine. All of them are better than the LS1 intake.

The 02 Z28 has to make do with the assorted junk and spare parts collected since 1999


Passenger side

Driver side, just noticed I missed a bit of clay from the intake testing.


Underside

Top

TB bracket detail

Last edited by 99 Black Bird T/A; 01-13-2019 at 02:13 PM.
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