1972 Procharged 581 Camaro

[speedjohnston]

Originally Posted by californiacuda

Thanks for sharing, what procharger are you running and did you think about turbos?

The procharger is a F2 and it makes fairly decent power. I did consider turbos as well, but decided to go with the blower. Both have there pros and cons, but for me the blower was the best all around choice at the time. The biggest draw back is the noise to some people for a street car and I had a 6/71 blower on my last engine with 3 1/2 inch straight through exhaust (mufflers but barely) and it doesn't bother me at all. If I ran turbos I would have had to run them up high to because of all the coolers I'll have in the front.

[deuce_454]

ive been a passenger in a procharged 540 bigblock car once, and he was running about 4000 stall, so at low rpm it was not making boost really a dog... not even impressive acceleration-wise.. 4wd volkswagens would get the jump on him.. and when he mashed the throttle, it would flash to 4000 rpm, make 12-14 psi boost and simply roast the tires, at almost any speed below 100 mph... the acceleration was equal to no boost, the volkswagen would continue to gain and i felt like i was having a near death experience.... im curious how yours will run, you do seem to have lots of tire.. but that has to be close a 900+ Hp engine, thats an awfull lot to put domn on the street...

[speedjohnston]

Originally Posted by deuce_454

ive been a passenger in a procharged 540 bigblock car once, and he was running about 4000 stall, so at low rpm it was not making boost really a dog... not even impressive acceleration-wise.. 4wd volkswagens would get the jump on him.. and when he mashed the throttle, it would flash to 4000 rpm, make 12-14 psi boost and simply roast the tires, at almost any speed below 100 mph... the acceleration was equal to no boost, the volkswagen would continue to gain and i felt like i was having a near death experience.... im curious how yours will run, you do seem to have lots of tire.. but that has to be close a 900+ Hp engine, thats an awfull lot to put domn on the street...

This one will work a little different. It will not have a 4000 stall for one, and it probably makes a little more low end torque then the one you were in (maybe not).
I don't have a scanner but the dyno numbers were kinda like this...
3400rpm 795lb-ft 514hp
4000rpm 898lb-ft 684hp
4500rpm 1009lb-ft 864hp
5000rpm 1120lb-ft 1067hp
5500rpm 1178lb-ft 1234hp and the torque was still climbing at this point.
This is where we left it. The intention was to dyno it again to 6000 or 6500 with the intercooler on. I had a custom one from bell made but the engine hasn't been back on the dyno yet.

I had the intercooler mounts made at the chassis shop so when it came home it was in the car. After this pic was taken I had the intake shortened 2 inches to lower the over all height of the motor in the car. The carb hat was also changed from the one on the dyno to the extreme velocity one. It is said to make 25-30 more horsepower then the stock procharger hat.

[deuce_454]

holy crap.. that thing is going to be an absolute monster.. it looks to come on smooth judging by the numbers, and i totally agree on the choice of power adder, it will not surprise you in any way when boost comes on like a turbo car can.. im sure most of the problem with the car i was in down to poor suspension, bad tirechoice and that converter..

[DFRESH]

Dude--insane! I love it. What are your plans for the car then? Is this PT, drag, street---all three or what? Freaking awesome---

Doug

[speedjohnston]

Originally Posted by DFRESH

Dude--insane! I love it. What are your plans for the car then? Is this PT, drag, street---all three or what? Freaking awesome---

Doug

The first thing is to get it running so I can drive it on the street. Then some testing at the local drag track to get everything sorted out at speed. If all goes well, a trip to maxton and hopefully the silver state classic. I don't think it will do so hot in an autocross. lol
Thats all part of the progression I was talking about, but as I post more pics you'll see its built to go around corners and stop to.

[70rs]

Great numbers on the motor. This should be a beast on the track once you get the suspension all sorted out.

[JimM]

Very nice, love those headers!

[speedjohnston]

The rear suspension was made to articulate to avoid binding but I may adjust it if needed when I get to the cornering part. There is a large center brace to keep it from shifting side to side.



Pardon the surface rust, I haven't stripped and painted this portion yet.

[tones2SS]

VERY, VERY NICE!!! Glad you started a thread for the build. Should be one heck of a beast with those numbers and the suspension/minitubs.
Keep us posted please!