A little help picking a new turbo - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 28 Old 12-28-2018, 08:36 PM Thread Starter
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A little help picking a new turbo

Whatís a good A/R for a basic GT40 top ended Fox? The A/R on my 70mm On3 is .70. The new turbo I was looking at is still a 70mm but had .81 or .96. A/R, They are out of the .81 and Iím wondering if the .96 is going to be too much for my setup. What do you all think? Any first hand experience? My car is also 90% street.


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Stock bottom end, gt40x, Ported GT40 tubular, On3 turbo, TKO, 5 lug, 4 wheel disc, etc
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post #2 of 28 Old 12-30-2018, 01:13 AM
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Is your motor laggy? When does the boost kick in?

If it's street, I'd want it as responsive as possible but still pull to about 6000 which also depends on your camshaft.

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post #3 of 28 Old 12-30-2018, 09:20 AM Thread Starter
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That is where I donít know. Iím putting stock cam back in, the boost before would start pulling at like 2500 rpm depending on throttle position. I guess my only fear was the .96 A/R would be too much and wouldnít kick in until way later. Or if I was just over thinking this all together lol.


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post #4 of 28 Old 12-30-2018, 09:21 AM Thread Starter
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These are the specs on the turbo I was considering:


PTE's PT7075 Turbocharger features the following:
ē 70mm inducer compressor wheel
ē Compressor cover - "H" compressor cover 4.0" inlet/3" outlet
ē 75mm, 84 trim turbine wheel
ē Turbine housing: - T4 Tangential .96 A/R with 3 5/8" V-Band discharge
ē Hydrodynamic 360į thrust bearing system


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post #5 of 28 Old 12-30-2018, 10:54 AM
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I've spent some time reading about different combos running different A/R's.

I've never seen anyone post results on .70/.81/.96 on the same engine. I have seen more than one post where the poster had an "all stock" 302 and their turbo has a .81 and the A/R is "perfect".

I have also spent a bunch of time watching and studying the setup on the Roadkill Rotsun. Everything about it screams it shouldn't work very well. From the sketchy hot side setup to the Powerstroke turbo. Yet it works really well on the stock 302 they have it on. I saw that they put a Banks turbine housing on it and I was able to find confirmation that the Banks housing has a 1.00 A/R online.

Why care about that? They use the E7TE heads and stock cam and they make peak torque at around 3800 rpm and the engine falls on it's face at about 5200-5300. I believe that's the heads fault.

In the Engine Masters video on the dyno the setup made over 600 ft-lbs at 3300 rpm at the crank running 14-15 psi. Set aside the numbers and boost level and consider that to double the factory torque at 3300 would require at least 14psi and you can surmise that the 1.00 on that setup was not an issue.

Also in this article Economical Turbo Kit - Wind Of Change - Muscle Mustang & Fast Fords Magazine they ran a .96 A/R turbo and it didn't seem to hurt boost performance even down at 2500 where it resulted in just over a 2:1 boost ratio (which is 14.7 psi).

So....1.00 A/R or 0.96 A/R..... let's say they are basically the same. And if it's not what you need, you can always buy just the 0.81 turbine housing and swap it to fine tune it later.

Either way I would like to ride in your car next summer. Hopefully my car will be up and running by then.
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post #6 of 28 Old 12-30-2018, 02:16 PM
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What cam did you have before? Is this the stock block?
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post #7 of 28 Old 12-30-2018, 02:24 PM
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I know he had an E303 and was on the factory block before.

He lifted a head gasket and is rebuilding now.
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post #8 of 28 Old 12-30-2018, 05:15 PM Thread Starter
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Quote:
Originally Posted by tjm73 View Post
I know he had an E303 and was on the factory block before.



He lifted a head gasket and is rebuilding now.


True story lol. E cam was in my stock block with my s trim and the car ripped. The e cam wasnít as fun with the turbo. I could tell that I was leaving a lot behind and I felt that Iíd be better off with the stock cam and 1.7 rockers. Lots of success stories with that combo. Thatís actually all I want from this. 4-450hp at the tire and something I can run mid 11s in with better drive ability than the e cam. I know I can make a custom cam blah blah but I have a stock cam and a brand new set of crane 1.7RR. I seen Power Added solutions sells the ďupgradedĒ On3 kit and used that turbo. I already bought the precision wastegate so I figured if I had some extra cash a new turbo might put me a little ahead of what I want.... the turbo I have is used but seems tight. I may just finish working out all the bugs on this car and buy the turbo this spring or summer after I see how the new combo works. But I was wondering when purchasing the turbo what disadvantages I would run into with that.


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post #9 of 28 Old 12-30-2018, 06:23 PM
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Yeah man. I'd put together what you have. You will easily hit your power goal. Plenty of people on the youtubes with that setup.

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post #10 of 28 Old 12-30-2018, 06:35 PM Thread Starter
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I mean, the car was fun with the S trim, it sounded mean at idle, it sounded even better when you hammered on it but I bet it only had maybe 375rwhp. And to be honest I was tired of the V1 whine. It was only cool at a cruise in lol other than that it started to get old. The E cam would buck though parking lots when you were trying to creep along. So now with my ďnewĒ combo Iím hoping to reclaim what I had lost with drivability and still have a fun street cruiser. Iím putting ARP studs in place of the bolts I had and Iím probably going to have the boost around 11-12psi.


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post #11 of 28 Old 12-30-2018, 06:39 PM
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The 7075 with a .96 will be lazy down low on a 302.
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post #12 of 28 Old 12-30-2018, 06:54 PM Thread Starter
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Quote:
Originally Posted by stangjumper View Post
The 7075 with a .96 will be lazy down low on a 302.


Thatís what I was thinking. Thank you for clearing that up


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post #13 of 28 Old 01-01-2019, 07:14 PM
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Yeah the .96 is lazy on my 347.

1992 black notchback... 347 boss block, afr 185 renegade, 80lb injectors, edelbrock rpm II, on3 7675, tko 500, 3.55 gears
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post #14 of 28 Old 01-01-2019, 08:19 PM Thread Starter
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Are you running a 7075 or something different? I think Iíll definitely go with the .81. Thanks


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post #15 of 28 Old 01-01-2019, 08:33 PM
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"lazy" wouldn't be an issue with a 4R with a proper convertor. Just sayin'......
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post #16 of 28 Old 01-01-2019, 08:43 PM Thread Starter
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Originally Posted by tjm73 View Post
"lazy" wouldn't be an issue with a 4R with a proper convertor. Just sayin'......


Lol I donít want to give up my TKO just yet....... one more season and then Iíll decide.


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post #17 of 28 Old 01-03-2019, 02:57 PM
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So I wonder what a 7675 .96 with ball bering ceramic. How whould the spool on street be.
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post #18 of 28 Old 01-03-2019, 05:14 PM
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The 7675 bb will spool a few hundred rpm sooner than the non bb. It will still spool slow on a 302/306 with a stick.
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post #19 of 28 Old 01-03-2019, 06:59 PM
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Mine is the on3 7675 and itís kinda a dog down low

1992 black notchback... 347 boss block, afr 185 renegade, 80lb injectors, edelbrock rpm II, on3 7675, tko 500, 3.55 gears
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post #20 of 28 Old 01-03-2019, 07:58 PM
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Ya I'm looking at a used [email protected] guy has a presishion turbo I beleave the best you can buy at the time kit is about 3 or 4 years old about 3000 miles. Turbo is a T76 GTS billet wheel turbo says full boost by 2700 with a stick he had TFS Heads .wants 3 grand plus shiping with .its a quality kit but if the turbo is going to suck on the street then not worth it.
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post #21 of 28 Old 01-03-2019, 09:34 PM
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You can do a CXRACING and save a grand.. The Headers are stainless steel..

https://www.cxracing.com/turbo-kit/t...-50-NEW-T70-IC

https://www.cxracing.com/index.php?r...product_id=629
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post #22 of 28 Old 01-03-2019, 10:17 PM
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What does "full boost at 2700" mean? How much boost and on what engine? What A/R exhaust?
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post #23 of 28 Old 01-03-2019, 10:37 PM
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-95 Mustang/Cobra turbo kit
BG Turbo kit
Precision T76 GTS Billet wheel Ballbearing turbo
Turbo blanket included
Braided oil line and drainline included
Precision 46mm Wastegate
Tial 50mm Q Blowoff valve
Cold side piping
35x12x3.5 intercooler
all clamps and silcone boots included
V bands on hot and cold side
All hot side is ceramic coated
XS manual boost controller
3.5 downpipe
Full 3.5" exhaust to tailpipe included with Borla XS muffler and muffler bypass pipe for track.
Can run with MAF or without


Everything you need to bolt on your sn95 to make huge power! Probably could make it fit on 87-93 mustang with modifocations
I made 770whp 679tq with this kit on 93 octane
will not seperate or ship
$3000

Exhaust should be .96
This is for a 94 95 car witch is what I have .
Cx racing kit is for the fox I'm sure I could make it work but I'm not a super good fabricator.
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post #24 of 28 Old 01-05-2019, 11:18 AM
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So he was saying 12 psi by 2800 rpm.on a 302 block with good head and good cam.
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post #25 of 28 Old 01-05-2019, 02:19 PM
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12 psi at 2800 on a 302?
I'm not buying it.
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post #26 of 28 Old 01-05-2019, 02:33 PM
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Ya it seems a little optimistic
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post #27 of 28 Old 01-05-2019, 08:39 PM
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Little? Lol
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post #28 of 28 Old 01-05-2019, 09:42 PM
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Said 2800 and whould red line at 7200 said he road raced it.
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