On3 TT Foxbody kit - 1993 Cobra - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 25 Old 02-04-2018, 08:33 PM Thread Starter
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On3 TT Foxbody kit - 1993 Cobra

I haven't seen alot of documentation online about the On3 TT Foxbody kit so I thought I would start a thread. This will be just for the turbo kit and not necessarily the whole car build. I really like the whole set up On3 has as I was never a fan of running the dump pipes over the headers like other kits. On3 actually suggested not buying the kit as they had fitment issues, wrong flanges on wastegates and so on. I decided to take the risk as every turbo kit I've had needed something.

Set up:
93 Cobra
331 Dart block
Eagle crank and rods
Probe pistons
AFR 205 heads
small turbo cam
TH400
Upgraded to twin 76's.

QA1 K member and arms
Strange struts and coil overs

Kit can be seem here:

1987-93 Foxbody Mustang 5.0 GT / LX / Cobra Twin Turbo System | On3Performance

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93 Cobra B&G T76
87 GN
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post #2 of 25 Old 02-04-2018, 08:35 PM Thread Starter
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Placeholder for issues

Placeholder for issues:

1. Header bolts are too long
2. Header to turbo bolts too short
3. No intercooler brackets, I guess they never sold any for a Foxbody
4. Air filters won't fit with large radiator and fans
5. DS header interferes with FL-1A oil filter, not sure if a 90 degree elbow will resolve the issue


93 Cobra B&G T76
87 GN
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post #3 of 25 Old 02-04-2018, 08:40 PM
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sounds stout

is this a strict drag car?

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #4 of 25 Old 02-04-2018, 08:46 PM Thread Starter
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Headers seem to fit

Headers seem to fit, overall quality is to be expected with On3. I did take a straight edge to the flanges and I could see light towards the center of the flange. Might have to do a clean up pass before final install.







Air filters won't fit with a large 3 core, I don't even have the fans installed yet.




93 Cobra B&G T76
87 GN
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post #5 of 25 Old 02-04-2018, 09:16 PM Thread Starter
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sounds stout

is this a strict drag car?
Just a fun street car.

93 Cobra B&G T76
87 GN
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post #6 of 25 Old 02-04-2018, 10:00 PM
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Just a fun street car.
what engine management?

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #7 of 25 Old 02-04-2018, 10:08 PM Thread Starter
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what engine management?


Holley EFI
120 lbs injectors
Holley Dominator fuel system
Plan on running e85




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93 Cobra B&G T76
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post #8 of 25 Old 02-04-2018, 10:09 PM
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air filters look troublesome. What's the downpipe situation look like?

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post #9 of 25 Old 02-05-2018, 07:47 AM
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Nice Build whats the specs on the turbos?
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post #10 of 25 Old 02-05-2018, 07:58 AM
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Air filters look like a design fail. You will have to fabricate some inlet tubes to move them to a more suitable location. Down low out front looks like a water vacuum waiting to happen. I'd have to get them up into the fenders where they would be protected from water splash.

Look forward to seeing how much power they make.

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post #11 of 25 Old 02-05-2018, 12:26 PM Thread Starter
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air filters look troublesome. What's the downpipe situation look like?
Not sure yet, could be a mess.



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Nice Build whats the specs on the turbos?
On3 76 but they sent .96 exh housing, I'm going to ask if they can exchange for .68 housing.
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post #12 of 25 Old 02-05-2018, 12:42 PM
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Dang man, you have me here thinking about twins instead of my single for my 351
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post #13 of 25 Old 02-05-2018, 07:49 PM
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Yea, a .96 a/r is a bit large for the cubes. Are their 76mm units available with the .68?

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post #14 of 25 Old 02-06-2018, 01:17 AM
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you could try the mushroom style air filter if you want something to clamp directly to the turbo
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post #15 of 25 Old 02-08-2018, 02:17 AM
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you could try the mushroom style air filter if you want something to clamp directly to the turbo
Air filters that small (small surface area) would make me nervous. I've seen large conical filters starting to collapse on relatively mild power levels.

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post #16 of 25 Old 02-08-2018, 09:45 AM Thread Starter
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Update:

DS air filter seems to fit but I'll need to find a solution for the lower rad hose.
PS air filter is just a little short, I'm thinking of finding a thinner radiator for clearance and maybe run one fan since Michigan weather is pretty tame but could affect True street events.



I'm truly amazed on the down pipe fitment as I don't see any issues so far. I need to send the exhaust housings back to exchange for .68 as I forgot to spec out when the order was placed. This will give me time to focus on the cold side and mounting the intercooler.




93 Cobra B&G T76
87 GN
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post #17 of 25 Old 02-08-2018, 09:54 AM Thread Starter
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Dang man, you have me here thinking about twins instead of my single for my 351
If you look at the header to frame clearance on the PS there's no way it would work on a 351. Going up and wider would make it impossible.
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post #18 of 25 Old 02-09-2018, 03:48 PM
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Can you elbow those filters up 90 to give you room for something bigger?
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post #19 of 25 Old 02-10-2018, 02:03 AM
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Those turbos look like they sit very low. Will they gravity feed return oil, or is there a scavenge pump needed?

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post #20 of 25 Old 02-10-2018, 09:13 AM Thread Starter
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Can you elbow those filters up 90 to give you room for something bigger?
I think so but I'm going to try to make it simple as possible.

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Those turbos look like they sit very low. Will they gravity feed return oil, or is there a scavenge pump needed?
Scavenge pump, they provide a tank, pump and all the lines for the kit. You have to fab your own pump bracket though.

93 Cobra B&G T76
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post #21 of 25 Old 02-11-2018, 11:56 AM Thread Starter
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Thumbs up

Comparing the Turbonetics T76 to the On3 76, I thought the Turbonetics was going to be a lot bigger but they are almost identical.

Im assuming one design is more efficient than the other though.





93 Cobra B&G T76
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post #22 of 25 Old 02-11-2018, 11:59 AM Thread Starter
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Intercooler is mocked up.




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post #23 of 25 Old 03-06-2018, 10:31 AM
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RobH - thanks for starting this thread - very interested in the "Packaging" of everything as I am... going to try to buy either an On3 or CXRacing Fox body TT kit and adapt it to my... 1977 Ford Bronco ! (Hey Broncos can share the Corral with Mustangs, right?)

I fully expect a bunch of cut and fit on this project - but I had no clue that the On3 TT "low" position was so much different than the CX racing "up high" placement. Now that I've seen your pics - I need to go back and look at my engine compartment again. My 5.0 is obviously the same as your 331 - but the Bronco frame is VERY different from the Fox unibody/cradle.

Sorry to bomb your thread - I will be watching with interest. I suspect that "up high" might be my only option as the frame hangs out down low in the Assy Drive area. Now I'm off to explore other TT threads
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post #24 of 25 Old 03-07-2018, 10:07 AM
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I have installed the cxracing gt35 kit on my car this past October. So far its not a bad kit......lots of cutting and figuring out how to install. Love to see it in your bronco if you go with it.
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post #25 of 25 Old 04-23-2018, 08:42 AM
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Question

Any updates on this kit? I was thinking about buying the single kit until I realized the TT is available. I should probably just get the single and upgrade the parts with the extra money.

'88 5.0 GT hatch AOD 3.08
stock 302, Ed Curtis cam & 11R 190 heads,
Holley SM2, 320 hp 332 tq to the wheels
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