Z28 parts question

[joeyrotorhead]

any info on the following Z28 parts:

1). Driveshaft (lightened, balanced, or just a standard driveshaft, etc...)

2). Clutch and flywheel (cant seem to find anything on if the flywheel is lightened and/or forged aluminum, etc... and what type of clutch we are running)

3). GM seems to be really backing these "Tri-Y headers" but all the tuners swear by the long tube headers

4). I know if we switch to a lighter race / track seat we will get an airbag sensor light... but does someone make a relay to extinguish this, if not, does having an airbag light throw it into a limp mode or affect anything else performance wise

5). has anyone confirmed if the Z28 actually does have the high flow cats

tried using the search function on these items but no luck on here or google

[radrace19]

1) Same as 1LE and SS
2) Same as 1LE and SS and C6 Z06
5) The GM part number is specific to the Z/28, but that could be for a number of reasons since they are also physically different.
-Greg

Originally Posted by joeyrotorhead

any info on the following Z28 parts:

1). Driveshaft (lightened, balanced, or just a standard driveshaft, etc...)

2). Clutch and flywheel (cant seem to find anything on if the flywheel is lightened and/or forged aluminum, etc... and what type of clutch we are running)

3). GM seems to be really backing these "Tri-Y headers" but all the tuners swear by the long tube headers

4). I know if we switch to a lighter race / track seat we will get an airbag sensor light... but does someone make a relay to extinguish this, if not, does having an airbag light throw it into a limp mode or affect anything else performance wise

5). has anyone confirmed if the Z28 actually does have the high flow cats

tried using the search function on these items but no luck on here or google

[Skylane765]

Originally Posted by joeyrotorhead

any info on the following Z28 parts:

1). Driveshaft (lightened, balanced, or just a standard driveshaft, etc...)

2). Clutch and flywheel (cant seem to find anything on if the flywheel is lightened and/or forged aluminum, etc... and what type of clutch we are running)

3). GM seems to be really backing these "Tri-Y headers" but all the tuners swear by the long tube headers

4). I know if we switch to a lighter race / track seat we will get an airbag sensor light... but does someone make a relay to extinguish this, if not, does having an airbag light throw it into a limp mode or affect anything else performance wise

5). has anyone confirmed if the Z28 actually does have the high flow cats

tried using the search function on these items but no luck on here or google

I would think headers will not help if any, plus need tune. The Z28 was made to work with what they put on it. I know many tuners that say that headers are not needed, even on the ZL1. Check with JRE. I would only change if there is proof and data that the modes will help.
In the old days headers helped allot. Now they make exhaust so well they do very little.
Old cars had 1 1/2 or 2 inch. Now we have 3 inch that is a big amount of flow.

[joeyrotorhead]

Originally Posted by Skylane765

I would think headers will not help if any, plus need tune. The Z28 was made to work with what they put on it. I know many tuners that say that headers are not needed, even on the ZL1. Check with JRE. I would only change if there is proof and data that the modes will help.
In the old days headers helped allot. Now they make exhaust so well they do very little.
Old cars had 1 1/2 or 2 inch. Now we have 3 inch that is a big amount of flow.

yep, guessing the Tri-Y headers are already pretty light too.

[joeyrotorhead]

Originally Posted by radrace19

1) Same as 1LE and SS
2) Same as 1LE and SS and C6 Z06
5) The GM part number is specific to the Z/28, but that could be for a number of reasons since they are also physically different.
-Greg

Thanks Greg!

[McRat]

The correct length long tubes with the crossover at the right distance will mug any set of shorty headers. It's a physics thingy. The primary tube length is best at certain distance based on the speed of sound, RPM, and cam timing. It's not as critical with blown engines, but there are still gain available.

What you need to find, is the true primary length of the C5R tubes. Most header mfrs guess at the correct length.

[Skylane765]

Sure there is a gain, but until someone has done the home work for the Z28 I would not bother just installing any set of headers. I remember my 327 SS Chevelle ran better with 1 3/4 Jardean than 2 inch Appliance headers. The 3 inch Z28 looks giant when you look at the ZL1 2 3/4
It makes sense that the blown engine works fine with the stock set up.

[McRat]

Agreed. The wrong header design is no better than shorties.

Most aftermarket headers are "guessed" at.

[McRat]

Hmmm... It would be interesting to see what the Z/28.R guys are running for headers.

[Skylane765]

They do not have to bother, they are restricted on the intake right? I do not think they run the full HP

[Zfatuated]

Originally Posted by Skylane765

They do not have to bother, they are restricted on the intake right? I do not think they run the full HP

Correct.

[McRat]

Originally Posted by Skylane765

They do not have to bother, they are restricted on the intake right? I do not think they run the full HP

The C5.R (our motor's daddy) was heavily intake restricted, IIRC 32mm x 2? Still made a whole bunch of power, and used long tubes.

To put it in perspective, if the C5R ran a single throttle body it would be 45mm, less that 2" diameter.

[Skylane765]

They can not use the carbon ceramic breaks also?

[Zfatuated]

Originally Posted by Skylane765

They can not use the carbon ceramic breaks also?

The BRAKES are not legal in those race classes. Another handicap for the race car vs the street car. The race car is actually handicapped in many ways. I'd expcect them to run essentially equal times on a road course and for the street car to be juast as, if not more so, durable.

How things have changed