More power is great. Until it starts breaking stuff. We added more than 75 wheel horsepower to our C5 Corvette Z06 when we swapped out the original LS6 for a crate LS3. But what are the ramifications of 560-plus crank horsepower for a drivetrain designed around a 405-horsepower V8? Weak links were …
Like the Z06 info
So starting with a bone stock C5Z, what is the budget to get where you are now?
Huge oil cooler, trans cooler and diff cooler. And a real mechanical oil pressure gauge.. the stock gauge is dampened and will not show the oil pressure drops under hard braking..
JG - will you give us a budget breakdown for the upgrades currently on the GRM Z06?
zrtman said:Huge oil cooler, trans cooler and diff cooler. And a real mechanical oil pressure gauge.. the stock gauge is dampened and will not show the oil pressure drops under hard braking.
Don't forget about a HD fabricated aluminum radiator.
The later '01-04 C5 2- pcs bat-wing oil pan should always be fitted with the Improved Racing trap door baffle kit.
Stock C5 front calipers tend to spread. The stock C6 base calipers are somewhat stronger and are direct bolt-on replacements with the same C5 mounting calipers and rotors. You can also upgrade to the slightly larger C6 Z51 rotors (340mm vs 325mm) and taller C5 Z51 mounting caliper brackets. Of course serious road course duty requires a "real" BBK.
jv8 said:JG - will you give us a budget breakdown for the upgrades currently on the GRM Z06?
So, this is just off the top of my head using prices at the time of acquisition. Prices on alot of this stuff has changed at the moment. But I'll prepare a final tally with better numbers at some point. Also, there are pretty round numbers. There's a LOT of nickel-and-dime stuff hiding around the edges:
Base crate motor: $9000
Aviaid Dry Sump: $4000
Additional oil control, plumbing and cooling: $1000
Radiator: $600
Headers and exhaust: $1000
AMT Suspension: $3000
Ridetech/Fox Coilovers: $4500
Wilwood AERO6 brakes and 4 piston rears: $5500
Holley Dominator EFI and 7" dash: $3500
Misc safety (bar, seat, belts): $1500
Mantic Clutch: $2300
Trans and rear end rebuild: $5500
Hubs: $1500
Hurst Shifter: $350
RHR and Nine Lives Aero: Probably $3000 or so? Hard to say since there's been a lot of fab work on our end, too.
Of course none of this includes labor, or stuff we replaced multiple times, and I'm also leaving out a lot of "OEM" services like rebuilding the torque tube and whatnot.
JG - seeing that you don't have a cooler setup for the differential and transmission, have you had any kind of issues of transmission/differential overheating?
Lowandslow said:JG - seeing that you don't have a cooler setup for the differential and transmission, have you had any kind of issues of transmission/differential overheating?
This was something I talked to the crew at GearFX about and their rationale was that if this was going to be mostly a TT car, running maybe 10-12 minutes flat out most times, that it probably wouldn't be necessary. Remember we did a lot of polishing inside the trans,and replaced the clutch diff with a gear diff, both of which are going to lower frictional heat. So we never really saw the additional complication and weight as necessary. For cars that are running longer sessions, though, it might not be a bad idea. Honestly I'd check and see what the NASA Spec Corvette guys are doing. They probably have some excellent data on drivetrain wear in well-known session lengths.
Never add it all up. Even if asked. Just don't do it. You'll start to question why you even play with cars.
The afe power driveline mounts are really expensive options these days. HPI makes a near identical one for like $200 or you can get ebay copies for like $80. The AMT mount mounts are a better deal. There are also cheaper hubs now too. MPI makes a set that is significantly cheaper.
A 401 CJ said:Never add it all up. Even if asked. Just don't do it. You'll start to question why you even play with cars.
100% this
just looking at that list makes me feel better about selling my C5Z and sticking with Miatas
In reply to JG Pasterjak :
Odd about the diff heat... Mazdatrix did testing between different diffs in their EP RX-7 and found that the Torsen made the rearend temps SOAR. I'd like to say it was like 300ish with a normal diff and 400+ with the Torsen.
There's a lot of heat buildup with those worm gears!
In reply to theruleslawyer :
Have you used these hubs or know anybody who has? Particularly on track days?
I need a pair of hubs but X-trackers aren't in the cards right now and was thinking about giving these a shot.
So I have one question: JG if you had it to do over, knowing all that you now know, would you do it again?
CJK440 said:In reply to theruleslawyer :
Have you used these hubs or know anybody who has? Particularly on track days?
I need a pair of hubs but X-trackers aren't in the cards right now and was thinking about giving these a shot.
I have and have heard from multiple people who have. They are great for the rear for sure. Some reports that they don't hold up in front, others that are fine. Might be dependant on if you're running slicks/aero for the fronts. I bought a set of fronts when I saw the sale but haven't put them in yet. I ran the rears all last season.
Loweguy5 said:So I have one question: JG if you had it to do over, knowing all that you now know, would you do it again?
its his job to do it all over again, that is why they bought the BMW :) content for the magazine
In reply to ClearWaterMS :
Yes I know. My question was more of whether the results merit the efforts and the expense.
Loweguy5 said:In reply to ClearWaterMS :
Yes I know. My question was more of whether the results merit the efforts and the expense.
FWIW, they did a lot of stuff you don't really need to get into. You can successfully track a c5 with basically a radiator and engine oil cooler. (well and the usual pads, fluid) Go look at spec corvette as a template for building a car that doesn't get you into insane upgrades even if you're not into the series. Depends on what you're looking for, but C5's are still doing well in other various grassroots series if you are building for that. Like a lot of cars there is a line you cross where costs rapidly escalate and it looks like this one went over it. In general the c5 is a great bang for the buck.
In reply to theruleslawyer :
I am fully aware. A C5 is likely the next addition to my garage.
Hmm... What about a K24 swapped C5?
Loweguy5 said:In reply to theruleslawyer :
I am fully aware. A C5 is likely the next addition to my garage.
Check out my build for another look at what you can expect.
https://grassrootsmotorsports.com/forum/build-projects-and-project-cars/c5-corvette-track-journey/261745/page1/
Pete. (l33t FS) said:Hmm... What about a K24 swapped C5?
so i had this whole post asking why, but decided to google that question first, apparently its been done before: https://www.thedrive.com/news/43782/honda-k24-swapped-c6-corvette-is-going-to-break-peoples-brains
i'm still not sure why, i feel like the LS is one of the reasons why people pick the c5/c6 chassis, its truly a great motor.
In reply to ClearWaterMS :
When it's not scattering itself on a regular basis 
I was thinking that a C5 might be a reasonable substitute for an S2000.
I remember seeing a Quad 4 powered C4 a ways back.
Pete. (l33t FS) said:In reply to ClearWaterMS :
When it's not scattering itself on a regular basis
I was thinking that a C5 might be a reasonable substitute for an S2000.
I remember seeing a Quad 4 powered C4 a ways back.
NC miata is cheaper, lighter, and k power makes a kit to bolt a k24 into it.
that being said; please build a c5 /w a honda engine it, and then proceed to take it to Corvette shows (and record the new balance and JORTS crowd reactions)
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