306 with pt7675 - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 15 Old 04-05-2017, 05:19 PM Thread Starter
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306 with pt7675

changing my combo a little..It is a 306 speed pro forged pistons rings gapped at 24 and 28,cobra intake, f cam, performer rpm heads, 42 lb injectors moates quater horse tremec 3550 26 spline input carbon fibre lined sliders, 31 spline mosers with 3.55s. with a standard on3 kit with the 70mm.
upgrading to 340 pump 80lb injectors,and a percision 7675 tuned by dirty dirty racing...so what kind of power do you think i can make befor it grenades. btw i have a 363 waiting for it wh

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post #2 of 15 Old 04-06-2017, 08:10 AM
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stock block? if so you could make enough power to split the block with your 70mm. the bigger turbo won't help the blocks power limit. :P

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post #3 of 15 Old 04-06-2017, 08:56 AM
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it can make plenty of power! I split 2 stock and a b50 block with a 306 and pt7675. Then i upgraded to a dart iron eagle and the car went 9.30's @ 2800 lbs with a carb and c4. Its a great turbo but it choked my 363 when i rebuilt the engine.
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2013 F350 4x4 Crew Cab
1990 LX 5.0 Convertable
88 Lx Coupe. Dart 363, Precision Turbo PT-88 and a Carb!
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post #4 of 15 Old 04-06-2017, 10:52 AM
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For your specific application I feel the On3 70mm would be a better turbo than the 7675.
I also don't think a 7675 is the correct turbo for a 363 either.

1993 Teal Cobra #2531 1 of 452, 347, Precision 7675, The entire kitchen sink....maybe 2 kitchen sinks at this point!
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post #5 of 15 Old 04-06-2017, 03:54 PM Thread Starter
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it can make plenty of power! I split 2 stock and a b50 block with a 306 and pt7675. Then i upgraded to a dart iron eagle and the car went 9.30's @ 2800 lbs with a carb and c4. Its a great turbo but it choked my 363 when i rebuilt the engine.
how fast did it go with the stock block and how much boost i have a c4 with a brake also but not in this car...
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post #6 of 15 Old 04-10-2017, 07:27 PM Thread Starter
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For your specific application I feel the On3 70mm would be a better turbo than the 7675.
I also don't think a 7675 is the correct turbo for a 363 either.
so if given a option between the two you would chose a on3 over the precision?
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post #7 of 15 Old 04-11-2017, 08:16 AM
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with the stock block the car ran low 11's. None of my stock blocks made it to the 10's.

as far as the turbo choice, i agree with Meegs on the 70MM for the combo you have now.
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post #8 of 15 Old 04-11-2017, 09:29 AM
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so if given a option between the two you would chose a on3 over the precision?
Yes. For a manual transmission, 306 stock block street car.
On3 70mm is well matched for useable power.

1993 Teal Cobra #2531 1 of 452, 347, Precision 7675, The entire kitchen sink....maybe 2 kitchen sinks at this point!
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post #9 of 15 Old 04-22-2017, 11:36 PM Thread Starter
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fyi it pulls like a frieght train..definatly needs a automatic in it though. I have a c4 with a brake,but i dont know if i want to do the c4 rodeo.
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post #10 of 15 Old 04-27-2017, 01:14 PM
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If you have a well built C4 it will be more reliable than any T5 or Tremec manual tranny.The torque you will be making will punish the manual transmissions to death.I have a Dynamic Mighty Mite C4 behind my stock 302/66MM Borg Warner turbo powered work car and it simply puts out tranny killing power every time I pass a Charger or unsuspecting SS Brand X turd every time I mash the GO pedal.

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post #11 of 15 Old 04-16-2018, 10:17 PM Thread Starter
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went 10.54 letting out....
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post #12 of 15 Old 04-19-2018, 01:36 PM
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went 10.54 letting out....
Nice...my stock block 306 went 10.38 @ 138 with a 5 speed and 66mm turbo...it proceeded to run 9.92 @ 141 with a C4 with trans brake...then the block cracked...LOL!

93 Notch 347 twin 66s TH400...8.54 @ 162 Radials

91 Notch 410W Novi 2000 5 speed...10.99 @ 136
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post #13 of 15 Old 05-05-2018, 09:30 PM
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Nice...my stock block 306 went 10.38 @ 138 with a 5 speed and 66mm turbo...it proceeded to run 9.92 @ 141 with a C4 with trans brake...then the block cracked...LOL!
What was the rest of your combo to run a 10.38?

'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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post #14 of 15 Old 05-06-2018, 08:33 AM
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What was the rest of your combo to run a 10.38?
out of the box Edelbrock Performer RPM heads
Comp Cams Turbo grind...232/228 dur and 540/532 lift
Edelbrock Performer RPM2 intake w/70 mm TB
Big fuel system with 42 lb injectors
Crane HI-6 TRC ignition/timing retard box
3.73 gears with 5 speed and 3.27 gears with C-4
28 x 10.5 Slicks
Full 3" exhaust with tailpipes and Flowmaster mufflers (Haha!)

Never on a dyno and never a chip tune, just old school jacked up fuel pressure (52 psi base pressure) and pull the timing out under boost with my Crane box

I was running this car back in 1998-2000...it was my first turbo car build.

93 Notch 347 twin 66s TH400...8.54 @ 162 Radials

91 Notch 410W Novi 2000 5 speed...10.99 @ 136
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post #15 of 15 Old 05-06-2018, 11:00 AM
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Nice!

'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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