REAR SUBFRAME.... take a look
#26
HAHA V8
iTrader: (9)
Hey Paul, I am the guy who bought your turbo, remember? What's up?
I will have Jim Labs cradle in my car come this May when I return home from school in FL. I have everything but axles for the swap. Can't wait to get this rearend put in so I can start cutting some nice 60ft times.......
I will have Jim Labs cradle in my car come this May when I return home from school in FL. I have everything but axles for the swap. Can't wait to get this rearend put in so I can start cutting some nice 60ft times.......
#27
Originally Posted by PDViper77
Hey Paul, I am the guy who bought your turbo, remember? What's up?
I will have Jim Labs cradle in my car come this May when I return home from school in FL. I have everything but axles for the swap. Can't wait to get this rearend put in so I can start cutting some nice 60ft times.......
I will have Jim Labs cradle in my car come this May when I return home from school in FL. I have everything but axles for the swap. Can't wait to get this rearend put in so I can start cutting some nice 60ft times.......
I remember, How are things working out? I can see from your sig that you are liking the setup. Good luck with the rest of your project.
BTW I ran a best of 11.4@ 123mph with that setup at 14.5psi with a street port motor.
#28
Originally Posted by digitalsolo
Better put, regardless of personal bias or opinion, I've never seen Jim put down something for his own sake, that was a benefit to the community.
So what you are saying is that it is cool for JIM to place his opinion on a product and or service and you call it "BENEFICIAL" to the community!
I completely disagree.... everybody has an opinion and why should I or anybody hold his opinion HIGHER then the next guys?
Yes, Jim has contributed tons to this community but that does not make him the Judge and Jurry when it comes to all other options for our cars. No one person can decide what is good and what is not or how much too charge for it.
Enough said!
#29
RX-347
iTrader: (2)
Originally Posted by paul_3rdgen
So what you are saying is that it is cool for JIM to place his opinion on a product and or service and you call it "BENEFICIAL" to the community!
I completely disagree.... everybody has an opinion and why should I or anybody hold his opinion HIGHER then the next guys?
Yes, Jim has contributed tons to this community but that does not make him the Judge and Jurry when it comes to all other options for our cars. No one person can decide what is good and what is not or how much too charge for it.
Enough said!
I completely disagree.... everybody has an opinion and why should I or anybody hold his opinion HIGHER then the next guys?
Yes, Jim has contributed tons to this community but that does not make him the Judge and Jurry when it comes to all other options for our cars. No one person can decide what is good and what is not or how much too charge for it.
Enough said!
His first post said the same thing my last post did. That the only point of this is to eliminate the torque arm, and there may be simpler ways to do it, but at least this is an option. I may have been more polite in the way I said it, but it's still the same statement.
I never said I was holding his opinion higher then yours, or implied it was any better then yours (actually I think most people's opinions are pretty much worthless, including my own, however observations of facts are an entirely different matter, and more along the lines of my intent in the post you quoted).
#31
Rob
iTrader: (2)
Jim is correct to an extent, but the fact of the matter is that neither this setup, not the Cobra IRS setup is "bullet proof." We all know this. I have purchase Paul's setup for the following reasons:
1) because it has been tested and beat to hell at that
2) because it requires essentialy no fab work on my end
3 because it eliminates the torque arm and hold the front end of the diff still (with bushings).
4)Because I already own an upgraded diff and 300M axles
5)Most Importantly, this setup will eliminate wheel hop without increasing NVH.
If you can eliminate wheel hop you can greatly reduce rear end shock, which is the #1 cause of diff casing failure. By holding the diff and tranny in place you allow engine torque to be smoothly transmitted through the driveline instead or bucked and jolted through in winding phases.
I also believe that the external torquing of the casing through transmission movement is a huge problem. It is interesting that I have yet to hear of a V8 swapped FD breaking a diff casing. Perhaps this is because the T56 utilizes a tranny mount, and because the LS1 motor mount setup allows less play than the FD setup.
Think about it.. Why aren't V8 RX-7 laying down **** loads more torque than their rotary counterparts breaking diffs?
I see the lack of front bushings as a weakness of the Cobra design and I am skeptical about its strength. Jim, how can you conclusively say that the Cobra IRS is stronger when sufficient testing has not yet been conducted. I also read about a structural failure due to a design flaw in one of your first units, though I'm sure this has been corrected in the current design? I commend you on your efforts, I am just waiting for more test data before I can openly accept it as a superior option. I'm sure you can understand that.
As you know, I am in complete agreement that the weak stub shafts and casing are the weaknesses of the Mazda unit, but I have no doubt that this IRS configuration will hold 600RWT as Paul said.
Solid diff bushings are not a viable option for me due to VNH.
For those of you with goals upwards of 800-1000RWTQ, you probably won't want to use either of these options. However, both options are sufficient for my short-term power goals.
Cheers to both of you for giving us options.
1) because it has been tested and beat to hell at that
2) because it requires essentialy no fab work on my end
3 because it eliminates the torque arm and hold the front end of the diff still (with bushings).
4)Because I already own an upgraded diff and 300M axles
5)Most Importantly, this setup will eliminate wheel hop without increasing NVH.
If you can eliminate wheel hop you can greatly reduce rear end shock, which is the #1 cause of diff casing failure. By holding the diff and tranny in place you allow engine torque to be smoothly transmitted through the driveline instead or bucked and jolted through in winding phases.
I also believe that the external torquing of the casing through transmission movement is a huge problem. It is interesting that I have yet to hear of a V8 swapped FD breaking a diff casing. Perhaps this is because the T56 utilizes a tranny mount, and because the LS1 motor mount setup allows less play than the FD setup.
Think about it.. Why aren't V8 RX-7 laying down **** loads more torque than their rotary counterparts breaking diffs?
I see the lack of front bushings as a weakness of the Cobra design and I am skeptical about its strength. Jim, how can you conclusively say that the Cobra IRS is stronger when sufficient testing has not yet been conducted. I also read about a structural failure due to a design flaw in one of your first units, though I'm sure this has been corrected in the current design? I commend you on your efforts, I am just waiting for more test data before I can openly accept it as a superior option. I'm sure you can understand that.
As you know, I am in complete agreement that the weak stub shafts and casing are the weaknesses of the Mazda unit, but I have no doubt that this IRS configuration will hold 600RWT as Paul said.
Solid diff bushings are not a viable option for me due to VNH.
For those of you with goals upwards of 800-1000RWTQ, you probably won't want to use either of these options. However, both options are sufficient for my short-term power goals.
Cheers to both of you for giving us options.
#32
Super Snuggles
Originally Posted by wanklin
Think about it.. Why aren't V8 RX-7 laying down **** loads more torque than their rotary counterparts breaking diffs?
Jim, how can you conclusively say that the Cobra IRS is stronger when sufficient testing has not yet been conducted.
Or, these pictures might help...
I also read about a structural failure due to a design flaw in one of your first units
I'm sure this has been corrected in the current design?
I am just waiting for more test data before I can openly accept it as a superior option.
1993 RX7
402 ls2/t56
507rwhp
609rwhp 100 shot no times yet
7.1@107mph
10.5@136mph NA 427
10.7@142mph 75 shot 402
#34
I found LS1-FD's car on torque central, and he seems to have modified Jim's Cobra subframe as well or maybe it is his own creation, seems to be a trend! Here are a few pics I copied.......
Jim does this look like yours??????????????????????????????????????????
Jim does this look like yours??????????????????????????????????????????
Last edited by paul_3rdgen; 05-23-08 at 12:19 PM.
#35
Super Snuggles
Originally Posted by paul_3rdgen
I found LS1-FD's car on torque central, and he seems to have modified Jim's Cobra subframe as well or maybe it is his own creation, seems to be a trend!
It looks like he added rubber bushings to isolate the rear of the differential from the subframe, the same as Chris Heiser did (see below). Heiser bought a set of aftermarket gears despite my recommendation to use only Ford Motorsport gear sets and so his gear whine was unlivable. So the changes are due to noise concerns, not a structural concern, but thanks for posting the pictures anyway.
I have nothing to hide here. I didn't make a cent off the Cobra cradles, and in fact, covered some of the cost of powdercoating half of the last run out of my own pocket because I'd underestimated and that's not the buyer's fault.
Unlike you, I only charged ~$450 for the complete conversion kit, including hardware, which was the cost of production based on materials and hourly rate. In addition, I let people go directly to the Driveshaft Shop for axles to eliminate the middle man and avoid any delay or cost increase.
Maybe I should take a lesson from the book you and Hinson seem to have read and charge $2,000 for the next modification I come up with?
#36
Super Snuggles
Originally Posted by gnx7
Mike (LS1-FD aka Mas280) ran all those times in his sig with a stock 4:10 Torsen FD LSD setup.
http://www.torquecentral.com/showpos...08&postcount=3
FWIW, Chris Heiser hasn't installed anything on his car without having some sort of problem associated, so I wouldn't be the least surprised if he stacked the bushings for the differential incorrectly and raised the pinion angle himself. Pinion angle was set to the FD pinion angle and I have no control over how Hinson's transmission mount positions the driveshaft... or user error.
BTW Mark, how's your LS7 coming? I thought I saw a post saying you were going to be picking it up a week or two ago.
#37
Those two are the only two currently being used with a V8 swap, and both are not using your design. Thanks for bringing that UP.
BTW JIM, I hope you feel like a good person now after posting your cost but you still don't have a clue what it is costing me. I am sure you will be waiting for the feedbacks from my rear subframe mod.
Another thing................. never compare me with Hinson!
BTW JIM, I hope you feel like a good person now after posting your cost but you still don't have a clue what it is costing me. I am sure you will be waiting for the feedbacks from my rear subframe mod.
Another thing................. never compare me with Hinson!
#38
Super Snuggles
Originally Posted by paul_3rdgen
Those two are the only two currently being used with a V8 swap
and both are not using your design.
Does that bother you for some reason, because it certainly doesn't bother me.
Thanks for bringing that UP.
BTW JIM ... you still don't have a clue what it is costing me.
I am sure you will be waiting for the feedbacks from my rear subframe mod.
#39
Jim, I give up with you.......... I am too old and too busy to argue with your bullshit. Have fun bugging somone else.
You know who made me realize that this has just become childish, my wife. She also said you may be smart but you have alot of growing up too do.
You know who made me realize that this has just become childish, my wife. She also said you may be smart but you have alot of growing up too do.
Last edited by paul_3rdgen; 02-06-07 at 02:33 PM.
#40
Super Snuggles
Originally Posted by paul_3rdgen
I am too old and too busy to argue with your bullshit.
keep going with your project because by the time [you're] done I will have scrapped mine and moved on [to] something else.
#41
Super Snuggles
Originally Posted by paul_3rdgen
You know who made me realize that this has just become childish, my wife. She also said you may be smart but you have alot of growing up [to] do.
#45
Super Snuggles
Originally Posted by paul_3rdgen
That's why I deleted it, if you didn't notice.
#48
Originally Posted by jimlab
Hi Noob. Are you starving for attention?
No not really, I just think it's a shame when a thread degenerates this far.
And being a noob I'm still very impressionable
BTW loved some of your very informative posts, inspiring.
#49
Newb Photog
Join Date: Jul 2001
Location: new jersey
Posts: 2,171
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Originally Posted by rhdv8
Can we leave it alone now? At the end of the day people will choose what option they want for their own reasons including cost
#50
Originally Posted by wptrx7
Actually, the more they debate the more I learn.