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Discussion Starter · #1 ·
I'm looking for a turbo recommendation. Here's some info on the combination - Street/Strip type deal

505" Pontiac (Aftermarket block IA2)
Mid - High 8's is the goal on a relatively small tire, but mid 9's would be a good starting point without the boost turned up.

4.350" bore x 4.250" stroke forged crank
6.8" Crower rod and Ross piston (Compression around 9.5 to 1)
Large Log style exhaust manifolds or headers if I can get them to fit.

Ported K.R.E. highport heads ported by Jim Robertson in Texas
Ported Victor intake (These are very good flow numbers for a Pontiac head without the pushrod moved out of the way and a small intake valve)

-- Flow sheet -- R.A.C.E. Ported
28" on a 4.21" bore - 2.20" intake/1.7" exhaust valves - No tube
Intake ports ended up @ 2.55" x 1.35" at the pushrod constriction
Sorry, I don't have all of the exhaust numbers.
__Intake_______________Exhaust__
.100__82.40_________.100__
.200__151.7_________.200__
.300__222.0_________.300__
.400__296.7_________.400__205
.500__349.6_________.500__
.600__367.8_________
.650__374.3_________.650__264
.700__374.5_________.700__
.800__377.9_________.800__
.900__382.4_________.900__

Cam will be a solid roller with .650" lift 240* - 250* duration @.050 range. Haven't decided who to go to for a grind.

'63 Pontiac Tempest Le Mans 3500 LBS - 3600 LBS
Strange 9" w/ brace, spool, 35 spline Mosers 4.10 but open to new ratio. I'm Thinking maybe a 3.50
Wilwood discs all around
Chassis Engineering Ladder bars 32" / QA-1 coil overs / 3-way Competition Engineering front shocks
8 point cage
28"x12.5" ET Streets (No tubs or back half) (Can fit 29 x 10.5 slick)
M/T ET Drag wheels all around
T400 w/ Hughes brake - No converter yet.
Blow thru carb

I'm thinking somewhere in the 101mm to 106mm range. I'd like to have some room to grow if the chassis is up to it.
 

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Discussion Starter · #2 ·
No love for the Pontiacs crew? :(

I'm buying a turbo next week so I'm looking for a little feedback.
 

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I will go out on a limb and say that you need a fairly large turbo if you plan to go with a single. Having that many cubic inches will restrict just about anything under 101-106mm. I don't know that these will be ideal for a street motor but you are going need a pretty big turbo to keep up with that size engine. The ideal scenario would be a twin turbo setup for a street/strip combo that size but I will let some of the other guys chime in with their opinions. This is right about where you were thinking too. We are building a 598" Ford motor and I originally wanted to go with a single but after talking to a lot of people we decided to go with twin 88's but this is not a street car.
 

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i am with mhancock on that one... i am also doing a 598(bbc though) and was going to go single. but, cant get a single to keep up with it... I would also think a 101-106mm is going to work alot better for a 505.
 

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At the minimum I would go with a with at least a 98mm compressor.
 

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Discussion Starter · #7 ·
Due to space limitations I need to run a single. The car will be mainly raced at a 1/8th mile track and see a little street driving to and from the track.

Does anyone object to a PT106 with a 1.32 A/R?(One just popped up for sale) Or do you guys think a PT101 with a 1.32 or 1.50 A/R would be a better fit?
 

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Due to space limitations I need to run a single. The car will be mainly raced at a 1/8th mile track and see a little street driving to and from the track.

Does anyone object to a PT106 with a 1.32 A/R?(One just popped up for sale) Or do you guys think a PT101 with a 1.32 or 1.50 A/R would be a better fit?
twins would be ideal but since you only have room for single I would run that pt106 and maybe get a 1.50A/R housing for it. You should'nt have a problem getting it spooled for the 1/8 mile. Is that turbo an f-trim or a G-trim?
 

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There are several big-inch small blocks with 4.250 strokes running singles...even down to a 94mm. You will be fine with any of the larger units; just make sure you have the higher-flow turbine wheel.
 

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Garrett 98mm will do, or a 106 as well. Just depends on how crazy you want to get. Exhaust side though, I would go G-trim turbine.
 

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Discussion Starter · #11 ·
twins would be ideal but since you only have room for single I would run that pt106 and maybe get a 1.50A/R housing for it. You should'nt have a problem getting it spooled for the 1/8 mile. Is that turbo an f-trim or a G-trim?
It ended up being a F trim so I'm passing on it.

I'm still looking for a PT101 or PT106 with a 1.32 or 1.50 A/R and G trim wheel if anyone has one for sale?
 
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