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Old 06-25-17, 09:21PM   #16
Mr.Pontiac
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thought id post these???
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Old 06-25-17, 10:50PM   #17
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Nice Rich !
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Old 06-25-17, 11:06PM   #18
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Quote:
Originally Posted by tjs44 View Post
Lou,he has no idea of what the engine is doing.I have been trying to get him to get it on a chassis dyno for years.By the numbers when I have run them he is making about 350 HP.He has no idea where the HP peak is or what timing the engine likes etc etc.He has been chasing his tail for years.Tom
Well he's had some real set backs with the head deal. I agree he's making about 350 hp. When you run the numbers. But to his credit he's made allot of changes in the right directions. He's so close ! When you get burnt you tend to thread lightly. That causes you to ask to many people and get different answers. He had to many things to over come, head nightmare, which lead to a no alternative Cam choice, right gear, right convertor. It's allot to over come. But to his credit he's now going in the right directions. Now if we only could get him to make a cam change.
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Old 06-25-17, 11:14PM   #19
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I'll say it to my dieing day..Jim Hand set the Pontiac hobby back 10 years with his Ram IV bull sh.it...we run well with stock parts. Rubber cast rods. There's still guys to this day that believed all that bull sh.it
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Old 06-26-17, 12:47AM   #20
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Heres a cam for ya. .050 255 intake 263 exhaust .020 288 intake 296 exhaust . lob lift .3600 intake .3706 . lobe sep 110 . gross lift .540 .556 . intake timing 39btdc 69 abdc exhaust timing 83 bbdc 33 atdc ..


Or just degree the cam you have!
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Old 06-26-17, 01:49AM   #21
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Heres a cam for ya. .050 255 intake 263 exhaust .020 288 intake 296 exhaust . lob lift .3600 intake .3706 . lobe sep 110 . gross lift .540 .556 . intake timing 39btdc 69 abdc exhaust timing 83 bbdc 33 atdc ..


Or just degree the cam you have!
Nice cam !
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Old 06-26-17, 10:22AM   #22
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Why so little lift?With his heads he could at least use a 400 lobe lift and 1.65s even if he had to back off a touch of duration.JMO,Tom
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Old 06-26-17, 12:39PM   #23
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Why so little lift?With his heads he could at least use a 400 lobe lift and 1.65s even if he had to back off a touch of duration.JMO,Tom
Don't want to give him to much power...LOL
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Old 06-26-17, 06:12PM   #24
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Nice cam !
That's a Harold Brookshire grind. Works real good with 670 and 16 heads.. He WILL have enough power for deep 11's with that cam..
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Old 06-26-17, 06:16PM   #25
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What are his heads and cam. And does he run them with stock rods ?
I tested a Tomahawk and it ran very well. 10.98 in my 9.3 CR 455. For the money, vs a fully ported HSD(which is what they are) hard to beat.
I had a buddy who went 11.05 in a pump gas 400, heavy second gen, iron headed engine with a RAIV cam. They can run. But if you can run something better, do it.
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Old 06-26-17, 07:30PM   #26
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Stated: ".....Off the line car shoots out and at 6200 the shift lite comes on.."

Rhetorical question, for conversation.....

If your engine is making peak power at 5800 rpm do you want to be shifting at 6200 rpm ?

This leads to a tale that might relate here. Years ago I had a 462 combo that made peak power on the engine dyno at 5800 rpm. The car was not being seriously raced and was seldom on the track, but when it was the shift light had a 6000 rpm shift chip installed. We never spent much time trying to optimize shift points, shifting at 200 rpm over peak power rpm seemed to work out ok. Later we made a cam change with 6 degrees less intake duration and then for interest we took it to the track. With the smaller cam on the first run the car was shifted at the SAME 6000 rpm..... it only ran 11.77 at 114.10 mph. Ouch, it was a dog ! The reason, we had forgotten to change the shift chip and the engine was now making peak power at a LOWER rpm with the smaller cam. So we then changed to the only other shift chip on hand at the time, it was for 5400 rpm. We then made another run this time shifting at the lower rpm resulted in a 11.54 at 116.73 mph time.
Much better. Because of time constraints we never did try to optimize it trying different shift points as we were there to do a carb test, I'm sure it would of picked up some if we played around.

So my suggestion as time permits, try shifting at a lower rpm and see what happens.

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Old 06-26-17, 08:06PM   #27
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You should shift your car 200 RPMs UNDER your desired shift point. It takes at least those 200 RPMs, time wise for the tranny to shift.
I shift my 455 at 5200 RPMs. 10.93.
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Old 06-26-17, 08:08PM   #28
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He has a 400 and no clue where peak HP is!Tom
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Old 06-26-17, 08:24PM   #29
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He's talking about the shift light flickering on and off, the shift light is set at 6200. Which is exactly what he should be going though the traps at. With the 3:70 gear he was only going though at 5800. So it's something new to him, and I'm sure he was asking questions. Think about this, before he made the changes he was only running 12.70's. With heads done right the right gear and convertor he's now running 12-1's.

Even at 12.70's the mph has not changed, he's still only making 350 hp. He's now running consistent 12.1's not 12.70's. So I think you guys are missing the point. This has been a 2 year ordeal. Trust my he's not driving though the convertor.
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Old 06-26-17, 08:37PM   #30
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He has a 400 and no clue where peak HP is!Tom
Tom...your missing the point, I pick the cam he's running so I know exactly were it's making peak torque and peak hp. He had a tight 10" 3500 convertor. That cam needed a 4200 stall, He's now running a 9" ( I believe ) the 3:70 gear and his tire diameter would only allow it to go though the traps at 5800. You want to be going though the traps at 500 rpms over were the motor is making peak torque.
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