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Old 04-14-2012, 10:51 AM   #290
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Nothing short of getting hit by a big rig would threaten the integrity of this driveshaft. If that happens the condition of the driveshaft is the least of your problems.

It's tucked up and out of the way and the exhaust pipes below it provide protection too. You'd have to be running brutal amounts of horsepower, in excess of 1000 hp before you'd get close to causing this to break and by that time I suspect you'd have broken gears or joints first already.

For daily driving on the street this shaft is actually overkill but it's great!
Is the shaft all carbon, or carbon over metal? Your build is very similar to my weight obsession with my road bike, replacing many parts for weight shavings, etc. Carbon is luxurious too, really deadens vibrations, but if you scratch the outer surface, it can form fissures and then "shatter" (it cracks and then the fiber are exposed, giving the illusion of shattering).
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Old 04-14-2012, 12:14 PM   #291
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What a great build! You've actually inspired me to do some of this to my ride as well. I've been looking to do a black and yellow theme, ala LiveSTRONG and this is just the type of touches I was thinking. Bravo to you sir!
Thank you.

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Is the shaft all carbon, or carbon over metal? Your build is very similar to my weight obsession with my road bike, replacing many parts for weight shavings, etc. Carbon is luxurious too, really deadens vibrations, but if you scratch the outer surface, it can form fissures and then "shatter" (it cracks and then the fiber are exposed, giving the illusion of shattering).
The tube is all carbon fiber, the ends are aluminum. The tube has a sealed coating on the outside; looks almost like a clear-coat. I have to say, having driven both on this car, aluminum and CF, that I prefer the CF. It is a tad quieter and has a slightly crisper feel when accelerating. After driving with the aluminum one for 8 months I noticed it immediately when switching to the CF shaft.
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Old 04-14-2012, 06:22 PM   #292
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I am sure the challenge of figuring it all out makes it worth it when you can feel it while flying around the track...nice !!

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Thank you for the kind words Femme. I haven't actually added up all the mods but I'm guessing I'm in ZL1 territory now. But a large (too large probably) chunk of that were the wheels. There were so few choices on much of this in the early days of this generation car that prices were high. And now GM comes out with the ZL1 and 1LE which duplicates and exceeds in areas what took me a couple of years to piece together.

Prices have also come down for some things. You could probably duplicate what I've done with different wheels (minus the paint mod) for about $20k on top of the price of the car. Although after reading the specs of the 1LE I would start with that car now.
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Old 04-14-2012, 10:57 PM   #293
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I am sure the challenge of figuring it all out makes it worth it when you can feel it while flying around the track...nice !!
It has definitely been a satisfying experience that is true. It was also gratifying to note how many of the changes I've made were basically the same ones done by Chevy engineers in the ZL1. My car doesn't quite track like the uber-tech magnetic suspension the ZL1 has but I bet my car could hold its own against a factory Z/28.

I never get tired of driving it. I think this car is one of the best things GM has done....ever.
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Old 04-16-2012, 03:33 PM   #294
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Awesome information. After your post in the Z28 threads I've come back and reread the entire thread again. I looked all through and did not see any written numbers on the weight savings from the catback exhaust change. Do you have that available? Also have you looked into possible weight savings from front seat changes?

Thanks.
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Old 04-16-2012, 10:38 PM   #295
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Awesome information. After your post in the Z28 threads I've come back and reread the entire thread again. I looked all through and did not see any written numbers on the weight savings from the catback exhaust change. Do you have that available? Also have you looked into possible weight savings from front seat changes?

Thanks.
Doc's car was my vote for closest car to the Z28 ideal by way of the build it yourself method. But that thread never went anywhere.

This car is first class. Respect.
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Old 04-17-2012, 12:22 AM   #296
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Awesome information. After your post in the Z28 threads I've come back and reread the entire thread again. I looked all through and did not see any written numbers on the weight savings from the catback exhaust change. Do you have that available? Also have you looked into possible weight savings from front seat changes?

Thanks.
Unfortunately the exhaust was the first mod I did way back when. I didn't get a chance to weigh the stock system but I believe (from what others have said) that it weighs about 70 lbs. I upgraded to 3" stainless pipes when I did the upgrade so the actual weight savings was probably only around 20 lbs. I'm not planning any other mods that require dropping the exhaust pipes so unless I get really bored one day and want to drop them just to see what they weigh, I can't give you an exact number.

I've considered the weight savings of custom seats but there really isn't that much there to save unless I get really serious about racing and sacrifice street comfort for all-out race seats. I'm not planning on that right now but in the future... who knows. I keep thinking I'm "done" modding this car then I see something else I hadn't thought of.... I don't have "mod-itis" as bad as some do on this forum but I'm getting pretty close lol.

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Doc's car was my vote for closest car to the Z28 ideal by way of the build it yourself method. But that thread never went anywhere.

This car is first class. Respect.
Thank you sir!
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Old 04-17-2012, 12:26 AM   #297
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Here's my current mod list:

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Old 04-17-2012, 12:33 AM   #298
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Unfortunately the exhaust was the first mod I did way back when. I didn't get a chance to weigh the stock system but I believe (from what others have said) that it weighs about 70 lbs. I upgraded to 3" stainless pipes when I did the upgrade so the actual weight savings was probably only around 20 lbs. I'm not planning any other mods that require dropping the exhaust pipes so unless I get really bored one day and want to drop them just to see what they weigh, I can't give you an exact number.

I've considered the weight savings of custom seats but there really isn't that much there to save unless I get really serious about racing and sacrifice street comfort for all-out race seats. I'm not planning on that right now but in the future... who knows. I keep thinking I'm "done" modding this car then I see something else I hadn't thought of.... I don't have "mod-itis" as bad as some do on this forum but I'm getting pretty close lol.



Thank you sir!
I don't remember if you are running cats or not but here is what my stainless 1 7/8" headers and complete stainless off road 3" exhaust weighed compared to stock.

Quote:
passenger manifold/cat 28.3
driver side manifold/cat 28.3
Catback and mid pipes 71.4
Total: 128


Passenger header 15.2
Driver side header 15.5
off road x pipe 24.2
muffler section 16.2
muffler section 16.2

total: 87.3

difference 40.7 lbs
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Old 04-17-2012, 10:40 AM   #299
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Unfortunately the exhaust was the first mod I did way back when. I didn't get a chance to weigh the stock system but I believe (from what others have said) that it weighs about 70 lbs. I upgraded to 3" stainless pipes when I did the upgrade so the actual weight savings was probably only around 20 lbs. I'm not planning any other mods that require dropping the exhaust pipes so unless I get really bored one day and want to drop them just to see what they weigh, I can't give you an exact number.

I've considered the weight savings of custom seats but there really isn't that much there to save unless I get really serious about racing and sacrifice street comfort for all-out race seats. I'm not planning on that right now but in the future... who knows. I keep thinking I'm "done" modding this car then I see something else I hadn't thought of.... I don't have "mod-itis" as bad as some do on this forum but I'm getting pretty close lol.



Thank you sir!
Thanks again. And know we appreciate the education and the hard work and time involved.
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Old 04-17-2012, 10:40 AM   #300
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Doc's car was my vote for closest car to the Z28 ideal by way of the build it yourself method. But that thread never went anywhere.

This car is first class. Respect.
Much agreed!
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Old 04-17-2012, 11:48 PM   #301
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I don't remember if you are running cats or not but here is what my stainless 1 7/8" headers and complete stainless off road 3" exhaust weighed compared to stock.
Yeah I do have the high-flow cats which probably weigh about 10 lbs each so based on your numbers that would put me at about 107 lbs which is about 20 lbs lighter so I had a pretty close guess. Thanks for posting this!
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Old 04-18-2012, 12:51 AM   #302
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Gives me ideas to try and drop this car down to 3000 flat or a couple pounds less. Thank you Doc! I've been reading to catch up and this thread is pretty amazing!!

EDIT- Without changing the iron to aluminum block idea, I could get my car to 3060ish.
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Old 04-20-2012, 11:07 AM   #303
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Hey Doc, have you ever found/looked into good lightweight racing seats?
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Magnuson TVS2300 with 3.4" Pulley, 1:1 Cog Drive, and RDS Spacer
2" Stainless Works Headers / Cat Delete / 3" Stainless Works Retro Chambered Catback
Cold Air Inductions Intake with ADM Scoop
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Old 04-20-2012, 12:22 PM   #304
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Gives me ideas to try and drop this car down to 3000 flat or a couple pounds less. Thank you Doc! I've been reading to catch up and this thread is pretty amazing!!

EDIT- Without changing the iron to aluminum block idea, I could get my car to 3060ish.
Glad there's some useful ideas in here for you, and thank you for the compliment.

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Hey Doc, have you ever found/looked into good lightweight racing seats?
Yes I have actually. The Sparco headquarters is about 45 minutes from where I live so I was thinking of driving down there and sitting in different seats to see which one would be the most comfortable. Problem is though, while a true racing seat would save weight, the tank plate and harness bar for a 4 or 5-point harness would add most of it back.

I've purchased a tow-hook which weighs 2.5 lbs and I have an SLP front splitter on the way which I'll weigh when it gets here. I'm also going to get the ZL1 sideskirts so between all these new pieces I'm guessing I'm going to add about 30-40 lbs back on the car so an 18 lb racing seat might become more interesting. I believe the stock seat weighs about 55 lbs.

I'm not a pro-racer nor do I intend to competition-race so it's not absolutely necessary I go this route but I'll do the research and look into it though.
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Old 05-05-2012, 01:49 AM   #305
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I have the SLP front splitter and ZL1 sideskirts (haven't installed them yet) but I did weigh them. The SLP splitter (with mounting hardware) weighs 4.4 lbs:
Name:  SLP Splitter.JPG
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The sideskirts (with hardware) weigh 4.8 lbs each.
Name:  ZL1 Sideskirt.JPG
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Size:  111.0 KB

I'll have to weigh the stock sideskirts and hardware when they're removed to get the difference in weight between them and the ZL1 skirts. I'll guess they weigh maybe about 3.8 lbs each so that would be a difference of 2 lbs for both sides, plus the 4.4 lbs for the front splitter. That adds roughly about 8.5 lbs total to my car but that weight is all below the axle line which is a good place to add it.

Tomorrow I'm out on the track at Autoclub Speedway in Fontana and I'll have some pics of that including some video. I pulled the video from Willow Springs but all I have is the follow laps where everyone who had never been on the track had to follow instructor cars for the first session to learn the line. I thought I'd turned the camera off after that session but apparently I didn't push the button far enough so the camera was left on and I filled the rest of my memory card with video of the front of my hood open. :P I'm going to make sure I don't make that mistake tomorrow.

I'll probably just do a single lap edit of the Willow Springs footage just so anyone who cares can see the course.

Ted Jannetty at Jannetty Racing did an email tune of the car and stabilized it nicely as well as adding some oomph on the bottom end. The car pulls like crazy right from the get-go. Can't wait to see how it does tomorrow!
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Old 05-05-2012, 08:13 AM   #306
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The bulbs I wound up with were 5100k color temperature 35w D1S bulbs from MTEC which is a Japanese company. I got a pair for $150 from Ebay. 5100k is the temp of the bulbs they put in high-end European cars and some of the upscale cars here like Cadillacs. It has a color like arc-light white which is exactly what I was looking for. Philips doesn't make a 5k bulb; theirs go from 4300k which is OE spec to 6000k which is too blue for my tastes. The MTEC bulbs are just the color I was looking for.
...
Any perceived loss of brightness overall?
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