Diff Brace
10-16-06, 12:05 PM
#26
NYC's Loudest FD
Originally Posted by Dan Schechter
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10-16-06, 02:50 PM
#27
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Originally Posted by RX794
Dan, it seems you're basically replicating the Adam Sawatari/PFS brace that was in Peter's drag car. They mounted the cradle brace and diff casing as you've shown with the rear casing bolts attached to the subframe as well with a plate, it worked for PFS and Adam, so it should work for you, we'll see. Does anyone have a pic of that Brace/Cradle PFS/Adam had on his their race cars? They were cutting 1.3 60fts at the time from what I remember with no breakage, maybe someone has more info on this.
10-17-06, 05:39 PM
#28
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Originally Posted by RX794
Stating that the brace doesn't work at all isn't true. Maybe at the level that Dan is at it doesn't work anymore which I can understand because he's reaching the limits of the entire powertrain in the FD, BUT for people making less power it's proved itself beneficial in preventing breakage. Me as well as alot of my friends have seen this benefit firsthand after breaking so many diffs w/o any brace.
10-18-06, 08:37 PM
#29
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Originally Posted by GoodfellaFD3S
I agree. The brace definitely helps those of us with 'normal' pump gas power levels, like below 450 rwhp or thereabouts. I also noticed that the rear of the car seemed much more planted on the street, and the drivetrain/shifter movement is almost entirely gone.
Sorry, I should have worded that more properly. The diff brace does help with wheel hop and vibration.....just like in Rich's statement here. Adams and PFS's braces had their flaws too, but it's not really my place to say how here, if you catch what I mean.
10-23-06, 10:28 PM
#31
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Originally Posted by Dan Schechter
Hey Josi,
Sorry, I should have worded that more properly. The diff brace does help with wheel hop and vibration.....just like in Rich's statement here. Adams and PFS's braces had their flaws too, but it's not really my place to say how here, if you catch what I mean.
Sorry, I should have worded that more properly. The diff brace does help with wheel hop and vibration.....just like in Rich's statement here. Adams and PFS's braces had their flaws too, but it's not really my place to say how here, if you catch what I mean.
Ray never broke and diff, nor did Peter, nor did Adam. 3 for 3 is pretty good odds. I'll have mine on this week for test and tune, but looking at what Ray showed me, I can't see it breaking. Peter used to cut 1.30 60' times with it with no ill effects. Im sure you can improve upon it, but to say it has flaws wouldn't be accurate.
08-22-07, 11:17 AM
#36
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2 cents
I also agree it helps. Not solving the problem but it helps. Come on its only 1hundred bucks! KGparts works fine for me. For higher horse cars though, it will just place the weak point somewhere else. The case. I wanted to build a bracket that completed holds the entire diff casing and not just the first 3 inches of it. .... Anyway...... Dee (reactiveracing) once told me its because of the rear subframe. He said it flexes. I need to solve the tranny thing first!
08-26-07, 09:09 AM
#37
I going to speculate since I've not tried or tested this theory as of yet but a seperate mount for the tranny and diff should help solve most of the case cracking problems. The diff and the tranny are moving in opposite directions of each other and off course the weaker part will give everytime. The PPF becomes a huge leverage bar with the diff trying to lift the rear of the transmission. Also the PPF is balancing the weight of the eng/tranny with the diff. The design of the PPF results in the diff becoming a structural point. The mounting point of the PPF to diff is also wrong. The force is being applied to the front and outer end of the case instead of being distributed evenly through out the diff housing. To make the matter worse the rear sub frame and the front frame/crossmember are flexing at different rates.
I'm going to be testing this theory shortly. A seperate mount for the tranny. The diff will have a mount that triangulate the the top mounts with the front and the rear of the housing using round tubing etc.
Ever wondered why most of 2nd gens(at least the ones I know of)are cutting consistent 1.3's and are not breaking the diff or anything for that matter. I know of one car that ran for over 2 years with the same setup and did consistent 9.30's cutting 1.3, 60ft's, leaving on the two step every time at 7000rpm and 14psi.
I'm going to be testing this theory shortly. A seperate mount for the tranny. The diff will have a mount that triangulate the the top mounts with the front and the rear of the housing using round tubing etc.
Ever wondered why most of 2nd gens(at least the ones I know of)are cutting consistent 1.3's and are not breaking the diff or anything for that matter. I know of one car that ran for over 2 years with the same setup and did consistent 9.30's cutting 1.3, 60ft's, leaving on the two step every time at 7000rpm and 14psi.
