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Wicked Wheel® 2 for 7.3L Powerstroke 1994-2003

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This wheel is a 1994 - 2003 Ford PSD 7.3L PSD Performance Billet Compressor Wheel for STOCK GTP38 and TP38 Turbo Applications - Wicked Wheel 2 (WW2) Compressor Wheel Series Part #WW38

Special Note: This turbo has a standard right hand thread - meaning you turn the compressor wheel to the left to loosen. No need to torque the Wicked Wheel on. Simply snug the Wicked Wheel until it fully seats. It will self-tighten to full torque. The Wicked Wheel is balanced at the factory. Turbo balancing after installation is not necessary. 
While capable of high boost numbers with supporting mods (like those shown in the graph below) these wheels are safe for stock turbo applications! We recommend that you continue using a wastegate in 1999-2003 models to avoid excessive boost. For maximum stock turbo life, do not exceed 32 lbs. of boost for extended periods of time. 

Wicked Wheel® is a registered trademark of Bob Riley and DIESELSITE, INC.  All rights reserved. Any intent to mislead or confuse customers by using our name or mark is a violation of trademark infringement and will be enforced.

DO NOT USE AN IMPACT WRENCH TO CHANGE TURBO WHEELS! Impact wrenches cause stress fractures in the shaft that will cause failure either very soon or thousands of miles down the road. It's like a crack in your windshield that grows over time. Take your time and remove the turbo, hold onto the turbine shaft and remove the compressor wheel with an open end wrench.



Our goal with this project was to create a more efficient turbocharger. When we talk about a turbo's maximum recommended boost levels, we base that on the rpms the turbo needs to turn in order to create said boost. When you increase boost without increasing rpms or drive pressure, the load on the turbocharger is the same for the elevated boost as is was for the original lower boost number.  The best part is when you run at lower pressures, like you would in daily driving conditions, the drive pressure/ boost pressure ratios are always lower, which should in turn result in longer turbo life, not less. ~ Bob Riley


Got my truck back today from the shop, went in for leaking o-rings and had them install the wheel also, o-rings are still leaking though so its back in the shop...But I got to drive it about 30 miles down to the boarder.

What a difference! The truck is a 1995 F250, 285k, down pipe, BHAF and thats it. The original wheel had quite a bit of wear but got the job done. (just made a 2000mi trip towing a trailer) In the short trip that I made, this is what I observed.

Spool - From a dead stop to the floor the turbo lights almost instantly. I would say it spools in half of the time compared to the original wheel. Driving in traffic it is a completely different truck. Downshifting out of O/D into 3rd there is no lag at all. With the passenger window down listening to the exhaust, from 1000-1300rpm the turbo gets singing alot faster over stock.

Power - Even though the truck has stock fuel there is a noticeable difference. Mountain passes in O/D around 1250rpm or so it will pull. To the floor 2500rpm it used to kind of fall off the map, now it will pull until the next gear. More power through all RPM.

Sound - My truck is a true beater. There are holes in the floor, gaps in the doors, no carpet or trim, it is rough and has alot of wind noise. Been like that for a while so I can notice a change in turbo noise. To me it is a hair quieter when its spooling, and a little bit louder when you let off the pedal. I think this is because the Wicked Wheel 1 would slice through the air causing more sound than performance. The WWII moves the air instead of slicing through it.

My truck has never ran better. It turned my old beater into a spring chicken.
Have thought about a tuner in the past but worried about my transmission since it is just a tow rig. Ill take this wheel over a tow tune any day.

I extremely recommend this product!!


10/10 cant wait to put more miles on it and buy one for my Super Duty!

I drove it on Friday on my stock setting (not my 80econo setting) and laid into it pretty hard.  Could only pull about 18lbs of boost.  That isn’t too surprising for my truck on winter fuel and stock setting.  After installation of the turbo I did a little playing around which may not have been too smart but I put it on the 80 econo setting and drove.  I drove it for 15 miles and laid into it pretty good….not to the floor though.  Well, I pooped my pants.  I think it downshifted….went like hell….and rapidly climbed past 25lbs then POP!  I blew off a CAC boot.  I know that thing was going to sail right on by 25 if it weren’t for the boot popping off.  Like I said, I don’t have access to a dyno but it sure feels stronger.  It sounds a lot different.  I won’t know if it totally cures surge until I get the camper hooked up in the spring.  I will know full benefits of the ww2 then.  I don’t use my truck as a daily driver, but I will get it good and warm sometime soon, but it in the 80hp mode and put my foot to the wood just to see what boost numbers I am looking at now.  I will then let you know what improvements I see.  Remember I did the EBV delete at the same time so not sure if all my info will be perfect.  But it does run a consistent 100 degrees cooler on the EGT’s.  ~Todd W.


The results before were 14 lbs of boost at 1200-1250 EGT's and that was all she had. Achieving 10 lbs of boost was a challenge for the truck, partially from a chewed up wheel but none the less, it was working hard to produce 10 lbs even in the cool climate here in Alaska. Last night on the way home I waited patiently for the traffic to open up just enough to give me room to smash the throttle and see what, if any results the wheel made. For a lack of better term, the results were AMAZING!! At roughly 3/4 throttle (because I was in traffic), 38 degrees, and just about three car lengths I saw 22 lbs of boost and EGT's never got over 900. This isn't where it stops, my cruising speed of 60-65 produced at most 1 lb of boost, I now cruise at nearly 5 lbs. The boost lag... it's non-existent. This thing (with straight pipe and wheel) reminds me of a 6.0 sound. It spools up immediately off idle and doesn't slow down until I let off the throttle. My EGT's at cruising speed ranged in the 850-900* range, I see no more than 700* when running the roads at 60-65.  ~ Nicholas S.


I installed the wheel today. OMG what a difference.   At first I thought, OK yeah I hear the difference. And figured well you always do stuff to your vehicle and psychologically think oh man what a difference. So I said nope not gonna do it, not gonna buy into the hype it’s gonna have to prove itself.  Holy shit did it ever.  Night and day from my stock one.   ~Tim J.


I just purchased my WW2 and installed in my 97 OBS this weekend. I just have to say totally awesome. I have a consistent 5 to 8 pounds of boost more then I ever did. The truck is so much more responsive it feels like a totally different truck. I think you hit a home run. Thanks.

~Daniel W.


Got mine installed, f***ing amazing, sounds sweet, surge is gone, and the extra power is great...
~Fred B.


Hey Bob. I got the wastegate adjusted on it and holy crap! There's no turbo lag and no surge what so ever. It hit 30 pounds of boost like it was just a walk in the park! I have only been able to get it up to 34 PSI so far (haven't been able to keep my tires stuck to the pavement long enough to see if it will push anymore than that). All in all I am extremely happy with the wheel and your customer service. You weren't even the one that sold me the turbo and you were more than willing to walk me through it to diagnose the problem. Again I can't explain how pleased I am and will definitely be shopping with you again.   ~Drew L.


WW2= Amazing!  Definitely an upgrade from stock wheel. The truck spools so much faster and I got an extra 5 lbs of boost out of it. I get 37lbs total now. Very loud turbo spool and an amazing deep low end tone. I’m very very happy with it for only having it in for a couple hours. I will put a lot of time on it tomorrow cruising around town. Thanks a lot guys. Outstanding job~
Robby C.



Below was posted by Bill at PHP
Okay... So I finally got off my lazy butt this morning and went over to the shop to test the new Gen 2 Wicked Wheel (that's MY name for it...) I got from Bob Riley last week while at PRI. (PRI, by the way, was AWESOME! Great show this year.) The original Wicked Wheel is familiar to most Power Stroke guys as the inexpensive wheel that helps eliminate Compressor Surge under certain conditions. What is Compressor Surge? I'm glad you asked. Compressor Surge is the condition in which air being drawn into the turbo stalls and "burps" back out the inlet. This is similar to Cavitation, a common problem in boating where the propeller is unable to properly channel water through the blades. This video shows what Compressor Surge sounds like on a stock Garrett turbo...

Anyway, the original Wicked Wheel was extremely effective in removing the surging, but in some instances it also lost a couple PSI of boost as well. This was generally accepted as the price to pay for the elimination of Compressor Surge. Not anymore.

The new wheel is a pretty drastic departure from both the stock compressor wheel and the original Wicked Wheel. These images show just how radical the new design is...

Stock (Click on images to enlarge)...

Gen 1 Wicked Wheel (Click on images to enlarge)...

Gen 2 Wicked Wheel (Click on images to enlarge)...

The pictures clearly show the effectiveness of the new design, but what I didn't expect were the results we achieved when we put this little puppy on my truck today.

Just for reference, my test mule is a 2001 F250 7.3L with 240,000 miles on the original PMR engine. I am currently running a set of Stage 1 Single shot injectors, stock HPOP, stock turbo, stock fuel system , Tymar intake, and 4" exhaust. When I say it's nothing special, I mean it. It's a solid daily driver and that's all I expect from it.

I pulled the truck on the dyno this morning to get some current baseline power numbers. After a few runs in both a 100 Performance and 140 Extreme program, I climbed in and started pulling the turbo off. I am seriously wondering if in 240,000 miles this turbo has never been off because that back clamp on the turbo was a freaking SOB to get off. I don't think I've EVER had one fight me that bad, and I've done quite a few!! After finally yanking the turbo off, I split the housing off the exhaust and then removed the compressor housing. The stock compressor wheel actually looked quite impressive given its age, and a quick test of the turbo shaft end play and lateral play set my mind at ease as to the reliability of the turbo itself. A quick spin and the new wheel was in place, and after replacing the compressor housing I made sure the new wheel wasn't going to turn into a high speed router and mill the housing to bits. 20 minutes later and the turbo was all snug and nestled back in its little hole. Time to see what's what.

I fired the truck up and let everything settle back in. Gotta make sure them turbo bearings are nice and lubed up before I go thrashing it. About the time I got the tools cleaned up and put away, the truck was ready for some [more] abuse. I started off with a surge test, similar to the one I did before taking the turbo off. Locked in 4th with the converter locked, I loaded up the dyno and rolled into the throttle. No doubt about it... The surge was gone! Check this video...

We wasted a couple runs just to get the EOT up to operating temp and then we got serious and started dynoing. What I discovered was astounding. First off, on the 100 HP tune we picked up a solid 20 HP with no other changes! On the 140 HP tune, we picked up a peak of 12 HP and almost 20 HP above 2500 RPM. However, this is nothing compared to the fact that the boost output jump from about 30-31 PSI at 3400 RPM to 43 PSI!! Can you say "Holy Crap?" I know I did! Check this video...

Now, keep in mind that my truck already runs pretty darn clean. I don't have any excess fuel to speak of, so the turbo is basically squeezing the last ounce of efficiency out of the fuel I do have. I am EXTREMELY curious as to how this would react to a truck with 180cc, 200cc, or larger injectors installed. Imagine... an otherwise Stock turbo being able to handle 200cc+ injectors without any real issue? It's staggering. Looks like I might have to retire the Stage 1's and step up to the plate for some Stage 3 Hybrids. Who knows, I may even be able to have a reliable 500 HP daily driver on a thrashed 240,000 mile PMR engine. At least I know the tuning won't be an issue. With my trusty dyno and CP tester on hand, I may even go for 600 HP. I seriously doubt a stock turbo will accomplish that, though, regardless of what wheel we put on it. Haa haa haa. At that point, it might be time for a B/W S472 or maybe twins. We'll see. I'm still monkeying around with the 6.0L and have some more things to do with that before I play with the 7.3L any further.

I'm still going through all the datalog information and will have some of that to post up later this weekend. In the meantime, pull up a chair and enjoy the videos.      

Take care.