HP Performance fox kit modifications/rebuild - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 113 Old 06-25-2012, 03:28 PM Thread Starter
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HP Performance fox kit modifications/rebuild

I made this thread to share my 'journey' in regards to the modifications I made to my HP performance kit to allow it to fit my 88 GT exactly the way I wanted it to. This is in no way a 'bash HP Performance' thread. I bought the kit used and in rough shape knowing that I would have to modify it to fit my needs. This is one of the original HP kits that was designed to work with a 60mm turbo. I originally only expected to have to make minor modifications, but as soon as I put the engine in the car, I quickly realized that major changes were necessary.



The passenger side fit fine. A little close to the boxed in frame rail, so that will be trimmed.


The driver side is where the issues were. There was no way in hell that the header was going to clear the beefy MM k-member.








My solution was to chop up the header and modify it so it would go between the power steering pump and frame rail.








I reused the original collector.


Good clearance to sway bar mount and frame rail.


Modifying that header left me with this:


So I re-built the crossover to mate up with the new collector. I also added a flex bellow while I was at it.






For those that are wondering, my turbo is choice was a Comp 76mm .96a/r with the billet wheel and ball bearing option. Oil fed and water cooled. Whole turbo weighs around 18lbs.






Next up is getting the turbo placement in the engine bay...


-Scott
88 GT
Turbocharged Dart 331 & complete resto in the works...
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post #2 of 113 Old 06-25-2012, 04:57 PM
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very nice.


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post #3 of 113 Old 06-25-2012, 05:55 PM Thread Starter
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The passenger header was designed for a 60mm turbo, so the 76mm Comp sat so low that the turbine housing was almost sitting on top of the frame rail. I had to modify the header to make the turbo sit higher.

Before:


After:


I had to hack away a lot of the boxed in framerail and fender apron so the turbo would fit. This will get fixed later.








Made a new downpipe because the old one was beat up pretty bad.




I also modified the rest of the existing downpipe pieces to work with the new turbo placement. Once I clocked that turbo up higher, it threw everything else off.






Downpipe and y-pipe all mocked up:







-Scott
88 GT
Turbocharged Dart 331 & complete resto in the works...
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post #4 of 113 Old 06-25-2012, 06:10 PM Thread Starter
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Mocking up the coldside:


After I mounted the BOV and the wastegate, I realized I had a clearance issue. The wastegate was a bit too close to the BOV for my liking. It probably would have been fine, but I wanted to recirculate the wastegate, so I had to modify it's location anyway.





Where I planned to relocate the wastegate:


New piping to make it all work.






Tacked in place:


[IMG]http://i21.photobucket.com/albums/b281/raceoholic330/Black%20Velvet/Restoration%20project%20-%202011

Clearance is much better now.



Welding everything together.




Exhaust hanger for the y-pipe.


I also welded bungs for the methanol injection.


Entire hotside all complete and ready for sandblasting.





Next I will address the mess I made of my fender apron and framerail to get the turbo to fit.

-Scott
88 GT
Turbocharged Dart 331 & complete resto in the works...
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post #5 of 113 Old 06-25-2012, 10:13 PM Thread Starter
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Plumbing the turbo drain required modifications to the frame rail:




Here is what was done to repair the area that the turbo sits in. I couldn't just leave a big hole in the fender.
















Also cleaned up the hole for the discharge tube.


What it all looks like.


Welded up.


First round of grinding.

-Scott
88 GT
Turbocharged Dart 331 & complete resto in the works...

Last edited by raceoholic330; 06-25-2012 at 10:18 PM.
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post #6 of 113 Old 06-25-2012, 10:28 PM
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meh.



Awesome work, love it.

KMS West member, SoCal chapter (retired)

9 second power, 14 second driver.
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post #7 of 113 Old 06-25-2012, 10:30 PM Thread Starter
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Here are the hot pipes before sandblasting:


All the pipes after sandblasting:


And finally, pipes after a trip to Jet-Hot:


Hotside mounted on the engine:






The downpipe got a little dent on the edge during the ride back from Jet-Hot. It will bend back easily though.




And that's about all folks. Took a lot of time and effort to get things just the way I wanted, but I'm happy with the outcome. Next time, I'll just make a kit from scratch! I orginally did not have the confidence to tackle a custom kit from the ground up, but halfway through I realized that I could have done everything myself.

The car itself is still very far off from being done, but it's getting there. For those that are interested, here is my full build thread on StangNet.
Raceoholic330's restoration thread. Dart 331, turbo, IRS, etc... | Mustang Forums at StangNet

-Scott
88 GT
Turbocharged Dart 331 & complete resto in the works...

Last edited by raceoholic330; 06-25-2012 at 10:35 PM.
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post #8 of 113 Old 06-25-2012, 10:31 PM Thread Starter
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Quote:
Originally Posted by GroverDill View Post
meh.



Awesome work, love it.
Thanks. Nice to see you trolling around here too

-Scott
88 GT
Turbocharged Dart 331 & complete resto in the works...

Last edited by raceoholic330; 06-25-2012 at 10:33 PM.
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post #9 of 113 Old 06-26-2012, 08:56 AM
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DAMN!!! Amazing work work there!!
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post #10 of 113 Old 06-26-2012, 12:48 PM
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Excellent work!!!

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post #11 of 113 Old 06-26-2012, 01:17 PM
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You did a really nice job.

I have half a mind to try something like this myself.

What tools were most useful for you in doing your pipe, and inner fender modification work?

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post #12 of 113 Old 06-26-2012, 01:48 PM Thread Starter
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Thanks guys.

The main tools I used for the fabrication were a 110v Lincoln Electric MIG welder and a 4 1/2 inch cutoff wheel. I used a flap disc to smooth out some of the welds on the driver side header. I also used electric shears and 14ga tin snips to cut all the engine bay pieces. The shears were great because they do not distort the metal as they cut. The tin snips were mainly used for tight bends and corners. A cordless jig saw was used for the 5" hole around the turbo inlet. I ate a few blades cutting a radius that tight.

If I do it again, I'll buy a small band saw to cut the pipes. The cutoff wheel worked fine, but a band saw would give me a more precise cut.

-Scott
88 GT
Turbocharged Dart 331 & complete resto in the works...
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post #13 of 113 Old 06-26-2012, 01:51 PM
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Good to know what to keep an eye out for, thanks! Where did you source some of the new pipe you used?

'94 GT, White, Cobra hood & bumper cover, '95R wheels
393w, Vic Jr 60cc, XE282HR, Victor 5.8 EFI, 80# injectors, Hooker LT 1 3/4 to 3", Borla proXS
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post #14 of 113 Old 06-26-2012, 02:38 PM Thread Starter
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I got just about all my stuff from Mandrel-Bends.com. I also picked up some of the v-band flanges, clamps, and silicone couplers from racepartsolutions.com

-Scott
88 GT
Turbocharged Dart 331 & complete resto in the works...
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post #15 of 113 Old 06-26-2012, 05:25 PM
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Quote:
Originally Posted by raceoholic330 View Post
I got just about all my stuff from Mandrel-Bends.com. I also picked up some of the v-band flanges, clamps, and silicone couplers from racepartsolutions.com
I was gonna ask the same thing about the mandrel bent piping ill he redoing my croosover soon looks fantastic can't wait to see it run

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post #16 of 113 Old 06-26-2012, 10:00 PM
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Good job for sure
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post #17 of 113 Old 06-26-2012, 11:35 PM
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I really like seeing people build their own stuff man that's a REALLY nice lookin setup. Job well done. I will not lie though I'm jealous of 1) Your garage, seriously do you sweep that thing nightly or what? and 2) Your fabrication skills. God I need to learn how to weld already. But seriously good job man it looks absolutly amazing. hope I can see it in person one day.

I'm not a magazine racer, my car is actually fast.
I also have a Honda civic but, mine has a bigger, uglier driver.
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post #18 of 113 Old 06-27-2012, 11:39 AM Thread Starter
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Lol. Thanks. I'm really anal about keeping the garage clean. I park my daily in there as well and use it for other things when I'm not working on the car, so I don't want it being filthy all the time!

-Scott
88 GT
Turbocharged Dart 331 & complete resto in the works...
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post #19 of 113 Old 06-27-2012, 02:42 PM
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Very nice work, hope to see the car out soon!

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post #20 of 113 Old 06-27-2012, 03:16 PM
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Very nice! Keep updating as you move along with the project.

Michael Bell
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92 coupe, coyote 5.0, turbo, manual trans, project in progress....

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post #21 of 113 Old 06-27-2012, 04:18 PM
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I am truely jealous. Awesome work there man.

Dart 348ci, Ed Curtis cam/valvetrain, Precision 76mm, Holley Dominator EFI, CNP ignition, tons of Holler EFI small parts, 4"dp, 4R70W w/T-brake, new suspension coming soon.

Little 750rwhp at 6,000rpms and only 10lbs of boost before we just got tired of playing with clutches. New 4R70W and we are turning it up. Expecting 1,000rwhp.
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post #22 of 113 Old 06-27-2012, 05:46 PM
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Garage
I read through your entire build on stang.net and took about an hour lol. Awsome build!!! Wish I had the "know how" to do that stuff myself, Great work!! I will continue to follow your build.

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post #23 of 113 Old 07-01-2012, 12:12 PM Thread Starter
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Thanks guys. I'll be sure to upate once the engine finds it's way back into the car within the next year or so (hopefully).

-Scott
88 GT
Turbocharged Dart 331 & complete resto in the works...
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post #24 of 113 Old 07-02-2012, 08:05 PM
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awesome build i'm dealing with the same thing on my car right now. one of the primary tubes on the drivers side header is hitting my teamZ tubular k member. still not sure if i'm gonna try to notch the k member or just build my own kit and sell this HP kit. i got my hot side brand new and dont really wanna hack it up... my job prob wouldnt be quite as pretty as yours lol
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post #25 of 113 Old 07-04-2012, 11:10 PM Thread Starter
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I probably wouldn't hack the k member. Too important of a structural component to do that, and I don't blame you for not wanting to cut up your new HP kit. It sucks that the HP hot side doesn't play well with aftermarket k members.

-Scott
88 GT
Turbocharged Dart 331 & complete resto in the works...
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post #26 of 113 Old 08-15-2012, 03:03 PM
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You did an awesome job. Pipe routing looks real clean and that Jet Hot looks great too.
A few questions..

How big is your down pipe?
What mufflers are you using?
Can you post some pics of the under axle tailpipes?
Where did you get that air filter?

Thanks a ton, and good luck with it! - Jesse


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post #27 of 113 Old 08-15-2012, 09:20 PM Thread Starter
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Quote:
Originally Posted by TWNWHR View Post
You did an awesome job. Pipe routing looks real clean and that Jet Hot looks great too.
A few questions..

How big is your down pipe?
What mufflers are you using?
Can you post some pics of the under axle tailpipes?
Where did you get that air filter?

Thanks a ton, and good luck with it! - Jesse
Thanks man.

The DP is 3.5"
The mufflers are Magnaflows
No axle on this car...going IRS. The whole catback is for a 99-04 Cobra.
The filter is a custom ordered one from S&B. Here is the link to the exact filter I used:
R1290

-Scott
88 GT
Turbocharged Dart 331 & complete resto in the works...
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post #28 of 113 Old 08-17-2012, 03:02 PM
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I dont have a welder and prob dont have your fabrication skills. More than likely will be ordering another b&g kit soon cause i know it will fit. Just pissed i already cut a big hole in my inner fender for the turbo to fit with the hp kit.
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post #29 of 113 Old 08-17-2012, 03:03 PM
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also what did that comp turbo run you? feel free to pm me if you dont want to post it here.
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post #30 of 113 Old 08-17-2012, 04:39 PM
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Looks great! I really like what you did with the passenger side frame rail and apron. I am in the same boat with needing to mod the frame rail and build the apron back (it was ALL cut out previously).

They say what goes up must come down but I ain't reached my cruising altitude.
Take a look at what I did but can you imagine what I'm about to do.
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post #31 of 113 Old 08-17-2012, 07:57 PM
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Very nice !!! Great work and good luck with it ....
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post #32 of 113 Old 07-22-2013, 08:28 PM Thread Starter
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The engine and hotside are installed. Once I install the radiator, I can get the coldside in as well.






-Scott
88 GT
Turbocharged Dart 331 & complete resto in the works...
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post #33 of 113 Old 07-22-2013, 08:50 PM
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what are your goals with this setup? its REALLY nice! that turbo is a beauty,never really paid attn to comp..was thinking they were part of pro comp..not sure how i got that idea?? its a dart 331? what heads,etc...if you are ok with letting that info out.
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post #34 of 113 Old 07-22-2013, 08:57 PM Thread Starter
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Thanks. The car is really just going to be a ridiculously over-powered street/show car. It has an IRS out back, so it will be fun in the corners.

The engine is a 9.3:1 Dart 331 with AFR 185's and a custom FTI billet cam. The turbo is a 76mm ceramic ball bearing unit with a billet wheel. Water cooled. People seem to make really good power with the Comp turbos. Should be a fun ride when it's done!

-Scott
88 GT
Turbocharged Dart 331 & complete resto in the works...
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post #35 of 113 Old 07-22-2013, 09:05 PM
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i would imagine it would be a fun ride!! i'm guessing 800 plus at the tires on good gas,etc

what are you going to use to control the motor ecu wise? what trans? might have missed that
i was looking at a 80mm comp triple bearing for my big bore 347 at one time
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