Joel K
Supporter
Alex,
I’m surprised at the feedback. You had one so you have the real world experience. I thought that is the gearbox they put in the Ford GT and some Ferraris so I’m suprised they don’t hold up.
Newbe Needing Help
- Thread starter Fabricator Dan
- Start date
Alex,
I’m surprised at the feedback. You had one so you have the real world experience. I thought that is the gearbox they put in the Ford GT and some Ferraris so I’m suprised they don’t hold up.
Joel K
Supporter
Either RCR or Kennedy Engineering can provide adapter plates and flywheels. You will need both.
RCR can do custom ones, they already have a wide selection available. Have you played with the “configurator” on the RCR site? On the Fuel & Drivetrain tab there’s a Transaxle/Engine Adapter Plate drop-down menu. It shows what adapters are available.
Howard Jones
Supporter
Everything you need to adapt pretty much any engine to any gearbox can be sourced from Kennedy Engineering. They might even have the RCR -adapter plate for a RCR- SLC. Ask them.
www.kennedyeng.com
Engine Adapters | United States | Kennedy Engineered Products
Kennedy Engineered Products manufactures engine adapters and high performance clutches for several different transaxles for the off road industry as well as VW, Porsche and Audi.
www.kennedyeng.com
Yeah I am on the Kennedy web site now poking around. So it looks like just about anything can be done as long as the trans can hold the power.
I am going to target around 650hp and 600tq. Also I want longer gears for half mile and mile racing along with some road course.
I am going to target around 650hp and 600tq. Also I want longer gears for half mile and mile racing along with some road course.
Brand new Ricardo on eBay for $14,500. https://www.ebay.com/itm/1874733908...MwQgoiKMhFYrztOlnEAU4BPMs=|tkp:Bk9SR7KFs8GaZg
That's what RCR supplies them for brand new.
Howard Jones
Supporter
Tracy, 650HP? You will need a racing transaxle. I do not believe that ANY production street car transaxle can standup to 650HP for very long IF you use tires that can provide enough grip to use 650hp.
I would think your powertrain behind the engine will cost NORTH of $60K to "hold 650hp"
I would think your powertrain behind the engine will cost NORTH of $60K to "hold 650hp"
Attachments
Maybe my HP and TQ goals are a bit harder to reach than I originally thought.
One more reason to maybe destroke an LS3. Less TQ more HP and RPM's
This could be promising. https://www.fortinracing.com/product/frs5-sequential/
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Ian Anderson
Lifetime Supporter
That looks nice but long so check it will fit inside the bodywork
Also racing box which tend to be straight cut gears and whine continually
Here are the measurements. Can anyone confirm this will fit?
No way it whines more than my kids, so I would be okay with it.
I bought a new Graz from RCR for my build, it took over a year to get. Then I had it sent out for drop gears and a clutch. At the end of the day, all in, I think it all cost around 18-19K and it can handle a bit more HP than what my motor is putting out (700-750). Easily the most expensive component of the car, so take your time to get it right.
Howard Jones
Supporter
Call up the drive shaft shop and ask them what they need to make you a driveshaft pair with CV joints to handle 650hp and about 700 ft/lb torque. Tell them you are going to run R7 Hoosiers and the gearbox will use a limited slip. Sit down for this........ My 600ft/lb axles/CV joint pair cost north of $1500. I once talked to a guy that supplied CANAM car replacement axles. One axle was a 1000 dollars. Oh and by the way the entire driveshaft systems on CAN AM cars, Indycars, etc are time change items.
I don't want to be a wet blanket on this power issue. I just think that we all should be aware just how much money it cost to build the rest of the car and not constantly replace broken parts once you go beyond 500HP. My car would eat used $600 Audi gearboxes like gummy bears.
There is a real reason that Porsche GT3-RS's cost 300 Grand. THEY have just about 500HP.
I don't want to be a wet blanket on this power issue. I just think that we all should be aware just how much money it cost to build the rest of the car and not constantly replace broken parts once you go beyond 500HP. My car would eat used $600 Audi gearboxes like gummy bears.
There is a real reason that Porsche GT3-RS's cost 300 Grand. THEY have just about 500HP.
The CTS-V guys have pretty good cv & drive shafts that don't cost a ton and handle 1500 hp. I'm not sure if they'd work for and SLC but maybe worth a look into.
No one is dragging these cars (or should be) with slicks. That's a tire mismatch for road racing on this car imo. Also, I have a Porsche with a PDK making 950hp, and it handles the power just fine. Plus, how do you explain the 700hp GT2RS? (It uses the same PDK transmission as the GT3RS)
Thanks for all the great information.
Joel K had stated that I should get in touch with Ron McCall, so I did.
He told me that both the Graziano and the Recardo transaxles are good choices, but each has its own difficulties.
The Graziano in most cases, needs to be geared down (drop gears) and are becoming harder and harder to find.
The Recardo on the other hand, may not need drop gears but have a long lead time (due to Ford hording them for actual GT40 owners) and replacement parts are non-existent other than that unicorn here and there.. and one individual that purchased a pile of damaged returns from Ford and is sitting on them.
That being said, I have found a Graziano manual at a junkyard for $5,000. It's a far distance away from California and the person on the phone acts as though she doesn't really want to sell it and ship it; at least to me.
So back to the Recardo... RCR has them (takes awhile to come in, but can get new ones from Ford). Hopefully parts won't be the Achilles heel.
I also spoke to California Auto Sports in Arizona, recommended a Porsche transaxle, but the $20,000 to $30,000 price was a bit steep for me.
Has anyone ever heard of using the GM Tremec TR-9080 8-speed dual-clutch transaxle? I don't know if it will fit in the SLC (my planned build), but would like to find out.
Thanks again for making it this far in my rambling!
Joel K had stated that I should get in touch with Ron McCall, so I did.
He told me that both the Graziano and the Recardo transaxles are good choices, but each has its own difficulties.
The Graziano in most cases, needs to be geared down (drop gears) and are becoming harder and harder to find.
The Recardo on the other hand, may not need drop gears but have a long lead time (due to Ford hording them for actual GT40 owners) and replacement parts are non-existent other than that unicorn here and there.. and one individual that purchased a pile of damaged returns from Ford and is sitting on them.
That being said, I have found a Graziano manual at a junkyard for $5,000. It's a far distance away from California and the person on the phone acts as though she doesn't really want to sell it and ship it; at least to me.
So back to the Recardo... RCR has them (takes awhile to come in, but can get new ones from Ford). Hopefully parts won't be the Achilles heel.
I also spoke to California Auto Sports in Arizona, recommended a Porsche transaxle, but the $20,000 to $30,000 price was a bit steep for me.
Has anyone ever heard of using the GM Tremec TR-9080 8-speed dual-clutch transaxle? I don't know if it will fit in the SLC (my planned build), but would like to find out.
Thanks again for making it this far in my rambling!
Imo the easiest path here would be to get that graz shipped and fixed. You should be able to find a used porsche pdk on ebay for a lot cheaper than that - I don't know about adaptability to a ls/lt motor but I believe it's been done. Upgrading a pdk isn't cheap, so maybe that was the 20-30k cost quoted?
That 9080 is out of the c8 right? I think someone makes a system to adapt it but I heard it was pricey/new, and I haven't heard of anyone putting one in an slc yet.
Howard Jones
Supporter
The 9080s in C8's are failing when used in track cars. They get too hot. I have no idea where the drag car drag slicks reference came from. The two cars you mention are rear wheel drive, typically run on street tires, and don't use transaxles. Put R7 hosiers on them, take them out to the track and run then 30 mins at a time a dozen times in a weekend and then we'll talk......tip......... bring a trailer.
I just put a $27K 996T Porsche in my SLC (see my build log) Done right that's what they cost. The G50 that came out cost $12K to repair and I would need $20K to sell it and break even. The best pieces built by the best cost real money.
That PDK controller to put one behind a LS cost about $15K. There is no cheap way to do this anymore. At least when you are considering 750HP engines. However a 350HP used LS in front of a 1000 dollar Audi GRBX run on street tires and driven sanely would be plenty of fun and would save you a lot of money. And you might just get it to work.........
I agree with Steve. Get that Gas, fix it and do the drop gear thing. Then put in front of one of the 525ish HP LS crate motors and get on with it.
I just put a $27K 996T Porsche in my SLC (see my build log) Done right that's what they cost. The G50 that came out cost $12K to repair and I would need $20K to sell it and break even. The best pieces built by the best cost real money.
That PDK controller to put one behind a LS cost about $15K. There is no cheap way to do this anymore. At least when you are considering 750HP engines. However a 350HP used LS in front of a 1000 dollar Audi GRBX run on street tires and driven sanely would be plenty of fun and would save you a lot of money. And you might just get it to work.........
I agree with Steve. Get that Gas, fix it and do the drop gear thing. Then put in front of one of the 525ish HP LS crate motors and get on with it.
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Got any
Take care that the Graz is in good shape. That's a ridiculously low price for a working transaxle these days so it kinda makes me suspicious. If it's in good shape then I'd jump on it. Shipping should be around $300-400.
R7 hosiers are closer to a slick than a street tire hence the reference. OP is building a street/track car iirc, not a dedicated track car. So, putting R7's on there would be wild. The Porsche PDK is a transmission and transaxle in one, automatic and electronically controlled -- $15k to control that is a lot but a used PDK + the controller would be sub 20k. It's used in RWD (GT2/3RS) and AWD (911 TTS) applications in excess of 500hp...on street tires. I agree, if OP is going to track the car only, this isn't the path. But he said street/track which most folks just keep a sticky street tire on there.
Howard Jones
Supporter
Call em up and ask em
