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Old 01-03-09, 12:22AM   #1
quick67bird
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Default Aluminum dports and twin turbo question

I was wondering if my ported heads might be too much for a turbo application. I want to eventually turbo my car, but I was not sure if I could use my heads. The heads are Kauffman Dports that flow as follows and have a 69cc combustion chamber.

lift......Intake......Exhaust
100....77.1..........62.6
200....150.6.........114.6
300....204.9.........152.9
400....250............177.9
500....288.2.........200.3
600....319.1.........226.6
700....336.8.........237.7

I have seen that alot of you turbo guys are very fast with almost stock heads. With these heads would I have to spin the motor very high to run a twin turbo set up.

Thanks for all your help.

Robert
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Old 01-03-09, 12:24AM   #2
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No problem with that head flow...bad69Bird's heads flow about the same.
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Old 01-03-09, 12:50AM   #3
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The heads will work very good with a turbo! No need for high rpm's just get a proper size turbo's and you will make a ton of power. If you picked turbo's that are too large then you would have to spin the engine faster. Whats the rest of the combo/ goals?
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Old 01-03-09, 01:03AM   #4
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The car is a 67 Firebird with 3.73 gears. I have a 3500 stall TCI NOS converter that will flash to 3800. I run anywhere from a 295 to 315 drag radial on the back. When I build the turbo motor I was going to use an IA II block with 505 CI. I am not sure I can get the compression down far enough with a dished piston.

As you can see I am still in the planning stage. I do have a 4.25 forged crank. My current 468 has all the good stuff like crower rods and ross pistons, but I am afraid to throw to much HP at a stock block.

Robert
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Old 01-03-09, 01:23AM   #5
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I would try to keep the compression 9-1 or under. I run 8.7-1 with 6x-4 iron heads you may be able to get away with a little more comp with alminum heads. As far as the block goes, If your running at the track all the time you should do a aftermarket block. With that said I run a stock 455 block speed pro forged pistons with a dish cut in them and scat h beam rods. I havent run into any problems with 3000 street miles and I beat the heck out of this thing.

Mike.
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Old 01-03-09, 12:30PM   #6
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Thanks Mike.

I won't run at the track all the time, but quite a bit. The main thing I really want is a time slip that I can throw down at cruise night or show to shut up the people with pretty cars. My car is kind of a rat hotrod, but does run good. I have always been more concerned with performance than looks.

Robert
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Old 01-03-09, 03:40PM   #7
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I wouldnt sweat using the stock block. I have been running in the 9's withy mine at the track and had NO issues with the block.
No caps walking, no broken lifterbores since turbos use conservative cam specs.

I have even detonated it a few times and burned pistons, trown a Sd rod and I still have not hurt my blocks as of yet. I am making 878 HP and it is fine.

I am planning on making 1000 Hp with this block just to show I can.

I dont even need to go faster but I think its important for people to see how much power they CAN make.

The bigger heads will be fine. They will just move more CFM at a lower boost pressure. so where I am running 11 psi you may make the same HP and move more air at 9 psi or less. Thats god because that means less heat.
You will need to match the turbos to the CFM of flow and if you look in the sticky's you can find that turbo math section which will help you figure all that out.
Dont get frustrated with the math. Its important stuff to know.
Good Luck
You'll have lots of help here.
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Old 01-04-09, 02:11PM   #8
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Thanks Jeff and Mike,

I have been reading the TFF forums and yellow bullet to learn more about turbos. You guys have really made this site a good place to read and learn about turbos too.

Thanks

Robert
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Old 01-04-09, 02:36PM   #9
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Quote:
Originally Posted by turbo69BIRD View Post
I am planning on making 1000 Hp with this block just to show I can.
That's before you start to get a little more "greedy" and we all cross our fingers.
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Old 01-04-09, 11:58PM   #10
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I dont know if I will get crazy. I have been told I cant bracket race a turbocar and win by my local dirt bag friends LOL
Now I may have to PROVE another point to them.

If thats the case I will dyno it BIG and then dial it back to be consistent.
Not sure what direction I will go but with the Gen 7 I should be super consistent.
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Old 01-05-09, 12:38AM   #11
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Quote:
Originally Posted by turbo69BIRD View Post
I dont know if I will get crazy. I have been told I cant bracket race a turbocar and win by my local dirt bag friends LOL
Now I may have to PROVE another point to them.

If thats the case I will dyno it BIG and then dial it back to be consistent.
Not sure what direction I will go but with the Gen 7 I should be super consistent.
I bet it would be deadly consistent! You could also dial it back to run 9.90's or 10.90's in SG or SST and really hack them off! S/Pro S/ST S/G. Just a few keys on the laptop and presto. Instant consistent!
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Old 01-05-09, 12:49PM   #12
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The nice thing about a turbo car is it comes on so hard at the top end the guys thinking you wont be there and then you come screaming up on them at the finish line. By then they thought they were breaking out and jumed on the brakes.LOL
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Old 01-05-09, 07:53PM   #13
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I like that idea too. Big dyno, a few few killer passes at some events, one or two for the locals to shut them up, and then dialed back 4 consistency. Don't forget the index races.
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Old 01-05-09, 10:00PM   #14
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My buddy who runs a LSX nitrous SS camaro was teling me about the index classes he runs at Epping NH.
Sounded like a cool schedule aith only 5 races needed for the season.

He runs the 8.50 index.

I dont want to run that fast I am hoping to keep it relaible and in one piece.

Maybe when the economy gets better I'l; start beating it up again.LOL
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Old 01-07-09, 12:33PM   #15
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High flowing heads moving more air at lower psi on the gauge is the same as adding a very efficient intercooler. You will find you actually need a LARGER turbo as it will think its on a larger engine. I have a post on here(I think,but possibly at py) that showed the effects of the better flowing heads. I'll try to find it.

IMO the biggest factor to longevity in a 455 combo is RPM not HP. The big heads are truly beneficial with the turbo as you can keep the RPM safe and turn up the power. NA you have to turn up the rpm to take advantage of increased flow to make power.
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