full-race geoff
Full Access Member
been a busy couple of weeks getting ready for black friday and all the sema madness... small update:
Front Diff is re-geared to 4.88 with Yukon gears and install kit + Ford Performance Torsen. I have always preferred more gear to less.. especially on a turbo engine which needs all the help it can get down low. I kept my oem raptor 4.10 front axle as a spare and bought a copart 5.0L front diff, pulled from a truck with 90k miles that was rear ended. Upon disassembly there was only usual wear, nothing concerning and was confident everything looked good to assemble
Installing front gears can be more challenging than rear gears because you'll want to use a case spreader. Without the spreader you will need a prybar and some cuss words, likely to mangle things trying to get them in and out
One thing I forgot to get a picture of is the crush collar process. It’s a really good idea to give this thing a headstart in the press - teeny amount of crush before it goes in the diff gets things started really nicely before cranking on your new pinion. I will begin to play with gussets at the weak points and am working on a simple heim-joint diff brace. will wrap that up next
to be clear - I believe 3.5L oil pumps are fine to 600+hp. It's at the 700+ level where I'm targetting for reliable operation that weaknesses start to emerge. that's why I believe it's an issue beyond just locking out the low pressure mode.
we have a good amount of experience with B58 and S58, and compared to the 58s the ecoboost platform is just not pushed that hard (yet). From the "racecar perspective" there are (2) 3,5L EcoBoosts I know of in the 9sec 1/4 mile range and I help both of them, Ive not seen anyone else push the 3.5L platform as hard as they do. The one guy Jake who runs 9.90's oil pressure is around 20psi during a launch (this is too low). And the other guy Carsen's oil pressure on the most recent pass dropped to 10psi on launch! this is possibly due to the oil pump's case flexing and allowing oil pressure to bypass through the low-pressure-crescent mechanism. Either way it's low compared to high HP gen1 guys that maintain 45psi oil pressure at launch on a gerotor
Front Diff is re-geared to 4.88 with Yukon gears and install kit + Ford Performance Torsen. I have always preferred more gear to less.. especially on a turbo engine which needs all the help it can get down low. I kept my oem raptor 4.10 front axle as a spare and bought a copart 5.0L front diff, pulled from a truck with 90k miles that was rear ended. Upon disassembly there was only usual wear, nothing concerning and was confident everything looked good to assemble
Installing front gears can be more challenging than rear gears because you'll want to use a case spreader. Without the spreader you will need a prybar and some cuss words, likely to mangle things trying to get them in and out
One thing I forgot to get a picture of is the crush collar process. It’s a really good idea to give this thing a headstart in the press - teeny amount of crush before it goes in the diff gets things started really nicely before cranking on your new pinion. I will begin to play with gussets at the weak points and am working on a simple heim-joint diff brace. will wrap that up next
to be clear - I believe 3.5L oil pumps are fine to 600+hp. It's at the 700+ level where I'm targetting for reliable operation that weaknesses start to emerge. that's why I believe it's an issue beyond just locking out the low pressure mode.
we have a good amount of experience with B58 and S58, and compared to the 58s the ecoboost platform is just not pushed that hard (yet). From the "racecar perspective" there are (2) 3,5L EcoBoosts I know of in the 9sec 1/4 mile range and I help both of them, Ive not seen anyone else push the 3.5L platform as hard as they do. The one guy Jake who runs 9.90's oil pressure is around 20psi during a launch (this is too low). And the other guy Carsen's oil pressure on the most recent pass dropped to 10psi on launch! this is possibly due to the oil pump's case flexing and allowing oil pressure to bypass through the low-pressure-crescent mechanism. Either way it's low compared to high HP gen1 guys that maintain 45psi oil pressure at launch on a gerotor
absolutely can do that. plugging in a dummy solenoid may do the same thing (will try when i have some time to waste). of course it does not address the mechanical liabilities
my industry friend Paul Svinicki has a 7.3L godzilla with 146 passes at the 1200hp level, changing spark plugs and oil. 14+ race weekends. Using OEM ford rings, bearings, head gaskets, bolts, crank and block. Upgraded pistons and rods, with heavy effort spent on timing chain and oil pump. As he says "getting rid of the cast powder metal bullsh1t"
hey eric, love your posts. what are you saying/coughing about the R oil pumps? Raptor R is badass, no doubt and they also can use oil pump upgrades - boundary has a great solution: https://boundarypumps.com/product-category/ford/5-2l-predator/ hopefully they can get something sorted for the Gen2 (i've been asking them for it!!)
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