PT67 vs PT76... ?
10-22-2006, 10:28 PM
#1
On The Tree
Thread Starter
iTrader: (4)
Join Date: Jun 2004
Posts: 182
Likes: 0
Received 0 Likes
on
0 Posts
PT67 vs PT76... ? So, I'm at a crossroad...
Car:
05 GTO m6
Stock internals 364 LS2
~238/242 115 +3 (blower cam)
Custom heads flowing ~310 (243 castings, 921 springs) (compression is guessed to be in the 11.5:1 range
)
1 3/4" headers (OFI kit has tubular headers)
With a D1-sc 3.7" pulley + ECS restrictor plate car (5.5psi at 6850) made ~550/500 on the local heart breaker mustang dyno (pre heads). Clutch gave up on the run with the heads (was lookin to tag 600+ with a couple more PSI).
I got bored and decided to go with the OFI kit. My dilemna is, 67 or 76...
I don't know exactly what my motor flows, and that's why I can't exactly look at the efficiency maps and go by that.
Knowing the pistons/rods are stock, will a 67 be able to flow enough to grenade the motor??? Will I even be able to spool the 76 before I shift at 6850 (don't want a supra...)? Maybe a 72gts would be a wise compromise?
Am I barking up the wrong tree with this cam either way I go???
Car is a DD and my main choice of poison is the roll-ons we have here in vegas. I hurt alot of feelings with the Procharger, but want to try something else, and possibly achieve a bit more tq to make the car even more lethal. Can anyone chime in? Again, I don't want the car to act like a 100mm supra.
Regards,
Jon Cain
Car:
05 GTO m6
Stock internals 364 LS2
~238/242 115 +3 (blower cam)
Custom heads flowing ~310 (243 castings, 921 springs) (compression is guessed to be in the 11.5:1 range
)1 3/4" headers (OFI kit has tubular headers)
With a D1-sc 3.7" pulley + ECS restrictor plate car (5.5psi at 6850) made ~550/500 on the local heart breaker mustang dyno (pre heads). Clutch gave up on the run with the heads (was lookin to tag 600+ with a couple more PSI).
I got bored and decided to go with the OFI kit. My dilemna is, 67 or 76...
I don't know exactly what my motor flows, and that's why I can't exactly look at the efficiency maps and go by that.
Knowing the pistons/rods are stock, will a 67 be able to flow enough to grenade the motor??? Will I even be able to spool the 76 before I shift at 6850 (don't want a supra...)? Maybe a 72gts would be a wise compromise?
Am I barking up the wrong tree with this cam either way I go???
Car is a DD and my main choice of poison is the roll-ons we have here in vegas. I hurt alot of feelings with the Procharger, but want to try something else, and possibly achieve a bit more tq to make the car even more lethal. Can anyone chime in? Again, I don't want the car to act like a 100mm supra.
Regards,
Jon Cain
10-23-2006, 12:06 AM
#5
On The Tree
Thread Starter
iTrader: (4)
Join Date: Jun 2004
Posts: 182
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Zombie
6.0 liters = no smaller than a T76
I'm looking at getting rid of my 76 for an 88. Jon here in town had a 67 on a car and managed to puke the turbine wheel right out the exhaust from over speeding it at 13psi on a stock 346 motor.
I'm looking at getting rid of my 76 for an 88. Jon here in town had a 67 on a car and managed to puke the turbine wheel right out the exhaust from over speeding it at 13psi on a stock 346 motor.
That's the thing though Jeremy, I'll only be playing with 8psi or so... what about the 72 as a mix?
10-23-2006, 12:59 AM
#6
On The Tree
Thread Starter
iTrader: (4)
Join Date: Jun 2004
Posts: 182
Likes: 0
Received 0 Likes
on
0 Posts
using stock consumption chart
http://www.forcedinductions.com/consumption364.htm
8psi, 1.54 PR, 59lbs at 6500. i drew the red lines using this info (the cross hatch is my mark for 3500 RPM (32 pr). i think my motor consumes alot more than 60 though..
76 looks more effecient. 66 looks like it falls off quick
http://www.forcedinductions.com/consumption364.htm
8psi, 1.54 PR, 59lbs at 6500. i drew the red lines using this info (the cross hatch is my mark for 3500 RPM (32 pr). i think my motor consumes alot more than 60 though..
76 looks more effecient. 66 looks like it falls off quick
Trending Topics
10-23-2006, 09:27 PM
#12
On The Tree
Join Date: Nov 2004
Posts: 199
Likes: 0
Received 0 Likes
on
0 Posts
Looks like the t66 would spool alot quicker than the T76. Which makes it better for the street but worse for the strip.also u would need alot more boost for a certain power level with the T66 vs The T76.
