When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
My quest for more POWER has finally come to fruition... I've been contemplating a supercharger for some time now but the only possible option was Whipple and, to be honest, I'm a turbo guy at heart... That coupled with the fact that the Whipple hadn't been truly proven on a 250 platform and there was only apparently one shop that had a tune... right... I wasn't overly keen on this option so held off.
Queue the folks at Underpressure Power & Performance (UPP) in Colorado. CK (the owner) and his crew specialize in Turbo applications and, most recently, have been working on a kit for the Raptor. I was keen on ascertaining opportunity for install on my truck (2013 F250) so inquired - CK expressed an interest and requested pics of the engine bay to determine if the kit for the raptor would cross pollinate. Everything looking good we decided to proceed.
I did my homework and these guys are the real deal (attention to detail and true craftsmanship) and very good to deal with thus far. Example - I'm up in BC (Canada) and needed to get my truck to CO somehow... CK actually flew out West to pick it up; talk about working with the customer!
Fast forward and my trucks at the shop now with the build starting soon.
I'll try and update this thread but encourage people to check out the UPP Facebook page here as CK will try to keep it updated with progress.
Also shoot me a PM with any questions and I'll try to answer or steer you in the right direction...
Apologies for the very protracted response time... I've been really busy with work and haven't had much 'play' time.
I do have my truck back and UPP did an incredible job on dialing this beast in. As a few of you have noticed, the UPP Facebook page has info/photos on the build so I recommend you check that out.
The quality of materials and craftsmanship on this project is second to none - CK and his team take pride in their work. He ended up using the larger (ball bearing) compressors as the original (smaller) compressor had some surging issues when under load and trying to pull this big girl up hill. The bigger turbo's have no issue whatsoever and will be great for pulling.
Now, as you can imagine, with any kit of this nature (never been done?) there are always a few gremlins to chase so we're currently working on that; nothing major so don't worry... mostly heat related issues (plug wires). The oil drain configuration on the super duty is also really tight (restrictive) with the large fan housing in relation to the oil pan so I've got some work to do on that to see if I can improve flow.
For those that asked - I've swapped the gearing to 4.88 and have an Air Locker in the rear and a Detroit True Trac in the front. The 37's are back on and I can say when the boost comes on with this thing it is awesome
I've also had the restrictive exhaust that was on the truck (2.5" with x-pipe and mufflers) removed and a straight true dual 3" setup installed. Numbers should be closer to the 545RWHP figures that UPP had on the dyno. I'm running at 7PSI right now (wastage spring) but have an EBoost2 to install and have some fun at higher boost levels.
The Raptor boys have been playing at this boost level and, although there have been some failures, everything seems to hold together. Certainly at 7PSI it should be safe.
Wow, 550rwhp AND 4.88 gears? Would you mind telling me which brand of tires you buy? I need to buy some stock in that company.
That engine bay is beautiful, they indeed do a top-notch job. Very, very nice.
Once you get the bugs worked out, and the tune finalized, I'd be interested to hear some of your comments regarding every day driveability, towing performance, mileage numbers and how it compares to those before the mods.
Thanks for the updates man. What a build this is. Has UPP contemplated making a kit now for the F250/350? I know my father is interested in this big time, but UPP is across the country so we would have to order the kit with instructions. Those are some serious gains though.
What made you go with the 4.88 gears? I figured with boost and traction issues, the 4.30 or even 3.73 would be a better option. Just curious.
Wow, 550rwhp AND 4.88 gears? Would you mind telling me which brand of tires you buy? I need to buy some stock in that company.
That engine bay is beautiful, they indeed do a top-notch job. Very, very nice.
Once you get the bugs worked out, and the tune finalized, I'd be interested to hear some of your comments regarding every day driveability, towing performance, mileage numbers and how it compares to those before the mods.
No Problem, I'm going to keep this thread updated with progress.
Originally Posted by dontletoff
Thanks for the updates man. What a build this is. Has UPP contemplated making a kit now for the F250/350? I know my father is interested in this big time, but UPP is across the country so we would have to order the kit with instructions. Those are some serious gains though.
What made you go with the 4.88 gears? I figured with boost and traction issues, the 4.30 or even 3.73 would be a better option. Just curious.
I would highly recommend your father give CK @UPP a call and discuss options. They have everything they need to fabricate a kit and I'm sure can work something out. Of course, we will be working on the tune over the next while to make sure everything is smooth as butter...
Re: 4.88 gears - I'm spinning 37's now and probably stepping up to 39.5's in the future.
Originally Posted by ALMACK
Nice build !
I have been thinking of doing a remote mount turbo system for my 2011 6.2.
It would be under the bed in the pass. side front corner.
( like the owner of the '94 Lightning in the attached pic did )
I would be very careful with how (where) you mount the intake... I suspect that lightning was a street queen; if that is the case with yours than you will be fine.
Looks good. I wish I would have been watching this more. I just bought a set of 4.30s for my 37s. I really wanted to go 4.88s but didn't feel like playing around with kits since most vendors don't know what to say about the 37 spline pinion. I can take a guess to say it's a 10.25 gear set and you swapped to the older 31 spline yoke. Any idea of what bearings are used so I can start kicking myself for over spending on a 37 spline gear set.
Looks good. I wish I would have been watching this more. I just bought a set of 4.30s for my 37s. I really wanted to go 4.88s but didn't feel like playing around with kits since most vendors don't know what to say about the 37 spline pinion. I can take a guess to say it's a 10.25 gear set and you swapped to the older 31 spline yoke. Any idea of what bearings are used so I can start kicking myself for over spending on a 37 spline gear set.
What brand gears did you buy? Yukon or Ford? I'm about ready to purchase 4.30's as well for more towing power but the Ford gears are twice the price of the Yukons. Sorry for the hijack. Sure wish I had the coin for a setup like this. Not sure it would pass california smog tests though....
03-01-2015, 12:11 PM
