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Old 10-23-2011, 03:33 PM   #76
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Default Re: Something's not right???

Ahh...Fuel. Now we are getting somewhere. Sounds like most of you agree, that giving it more fuel and making sure my flow is adequate will equate to more MPH.

Yes, I race at Mission and the dyno used is accurate with no correction factor. I am confident I have enough motor to do what I want...run 11.50 and then slow it down to run 12.00. I based the build off this goal....not making max power.

FWIW the heads did get a fluff and buff to smooth them out, as out of the box they seemed a little rough... and the car does have 4.10's in it already.

I wish the tracks weren't closed, as I would have liked to try a set of 26 or 27" tires, to see if I could get the 60' down and the rpm's to spin up a little quicker. I know most people like to run the tallest tire and gear accordingly, but do you think I could save doing a gear change and just change to smaller tires? I am sure I can get the car to hook with the suspension changes planned.
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Old 10-23-2011, 03:50 PM   #77
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Default Re: Something's not right???

I run 3.08s with radial and a 5sp.

I doubt if it will require much gear to run well with the small cam your running.
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Old 10-23-2011, 03:51 PM   #78
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Default Re: Something's not right???

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Originally Posted by Dual 4's View Post
Will it hurt the power steering system at all if I run it at the track with out a belt?
Sorry it took so long to answer this. No, it will not hurt your power steering box to remove the belt. I drove a car around like that for two years once, daily driven. As long as there is still a hose connected to the fittings on the box, then there is somewhere for the excess pressure to go. In other words, don't just plug the fittings on the box. You can remove the power steering pump completely to save the 15 pounds or so it weighs, or just leave it on and leave the lines connected. If you remove the pump, one of the two lines that goes to it will have a fitting that will allow you to loop that line from one side of the power steering box to the other. That little look is all you need to keep from damaging your box. Hope this is clear enough. Let me know if it doesn't make sense and I'll try to clarify.
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Old 10-23-2011, 03:53 PM   #79
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So besides monitoring the unknowns (fuel pressure/jetting/etc) what is the trap RPM in comparison to peak HP on the dyno? Do you have the dyno sheet, or could you post the HP and torque numbers, starting from peak torque and leading to the HP number 1000 RPM PAST peak HP? Will need to see RPM numbers, in this case it's more important than the actual output. (trying to determine the best converter stall and gear selection)
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Old 10-23-2011, 03:53 PM   #80
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Default Re: Something's not right???

Also, I've got some 26/11.5-15 MT ET Streets that I made 7 light passes on, nearly new, for $250 if you want them to try out. They should help you pick up some ET, maybe even a couple tenths.
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Old 10-23-2011, 04:10 PM   #81
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Default Re: Something's not right???

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Also, I've got some 26/11.5-15 MT ET Streets that I made 7 light passes on, nearly new, for $250 if you want them to try out. They should help you pick up some ET, maybe even a couple tenths.
Haha Greg...I guess that's shipped, eh? I follow the NPSA and saw that you had dropped them to $200..lol
I was at the Big Dog race in Seattle spectating when you were trying to get them to work. I am sure they would work for me and may consider them if I go that route. Thanks.
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Old 10-23-2011, 04:20 PM   #82
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Default Re: Something's not right???

RPM HP TQ
4900 - 434.2 465.4
5000 - 443.3 465.6
5100 - 451.4 464.8
5200 - 457.9 462.5
5300 - 463.8 459.6
5400 - 468.2 455.3
5500 - 472.6 451.3
5600 - 476.5 446.9
5700 - 479.4 441.8
5800 - 481.2 435.8
5900 - 479.6 427.0
6000 - 477.5 418.0

Avg
4900 416.0 445.5

My dyno sheet only goes to 6000 rpm. Trap rpms are about 5700 rpm.
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Old 10-23-2011, 04:20 PM   #83
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Default Re: Something's not right???

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Haha Greg...I guess that's shipped, eh? I follow the NPSA and saw that you had dropped them to $200..lol
I was at the Big Dog race in Seattle spectating when you were trying to get them to work. I am sure they would work for me and may consider them if I go that route. Thanks.

That's the NPSA discounted price, I always put stuff cheaper there to offer to the "family". $200 to you too then. Come get them or have someone pass by my place on the way to SCSN, or meet me at SCSN for them and they are yours.
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Old 10-23-2011, 05:56 PM   #84
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Default Re: Something's not right???

Looks like a nice flat dyno curve, and although the power peaks a little early (not considering how small the cam is) it appears to hold on pretty decent. You need to decide (or find out) how high you can rev the engine, then pick a stall speed 1500 to 2000 below that. FWIW my engine peaks at a low 6000/6100 (head restricted) but only loses 15 HP at 6500. I run a 5300 converter and 6800 shift points (playback shows 1-2 may sweep to 7100/7200 depending on how quick I'm on the shift light) and trap at 6900 +/-. Assuming the engine is designed to turn 6500, and all the "restrictors" are eliminated (what's currently holding it back) I can't help but think winging the engine somewhat will be the quickest way down the track. Every time I've thrown gear at my car it's been quicker. Currently run 10.5's at 127, 4.56's and 29.5 bias M/T's.
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Old 10-23-2011, 09:09 PM   #85
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Default Re: Something's not right???

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Hmmm that's funny I ran 11.7s with a sportsman 2 and a 248 solid flat. Best mph 115. On a 350, guess I'm lucky.
Sportsman II has a 200cc runner, and the cross section in a Sportsman II is better. A Sportsman II will go 240cfm on a 4.060" bore, the Dart 215 Platinum is 245 with a 2.055" valve.

The only issue with Sportsman II is they need help on the exhaust, the runners are about the same cross section as 461/291 heads and flow right on par with them 461/291 exhaust runners.
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Old 10-24-2011, 01:14 AM   #86
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Default Re: Something's not right???

Ya I know all about the head just saying I don't think he needs more cam to run 11s especially when he only wants to go 1150. If he wanted to go further I would say port the heads more and go a little more cam but that's not what he wants her needs to get his car to 60 and get it down the track. He needs to go over the whole car and figure out what's holding it back be it fuel pressure or whatever it is.
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Old 10-24-2011, 01:41 AM   #87
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Ya I know all about the head just saying I don't think he needs more cam to run 11s especially when he only wants to go 1150. If he wanted to go further I would say port the heads more and go a little more cam but that's not what he wants her needs to get his car to 60 and get it down the track. He needs to go over the whole car and figure out what's holding it back be it fuel pressure or whatever it is.
He needs more cam, He is loosing a SOLID 6-8 degree's seat duration, due to it being a solid and is lashed. He also needs the extra duration, and extra exhaust duration on the seat only, to provide the torque needed from a head that is a little small for the engine.
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Old 10-24-2011, 11:24 AM   #88
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Default Re: Something's not right???

Yes I would put more cam in also but the power is there he just needs to get it to the ground and excelerate down track. Its easy to upgrade fuel line if that's the problem. He needs to upgrade susp in one way or another since it is spinning.
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Old 10-24-2011, 11:33 AM   #89
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Default Re: Something's not right???

Duel
I assume you have that black pump mounted by the tank.
Does your tank have a sump. It should to feed the pump right.
You should upgrade to -8 to the reg. I suggest the black nylon braded line from jegs or who ever you want. Its lighter than steel braded witch is a plus for a chevelle and it also won't poke your fingers.
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Old 10-24-2011, 09:17 PM   #90
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Default Re: Something's not right???

Yes, the pump is at the tank. Stock tank, no sump. I already have the -8 steel braided line that I am going to run to the reg. If I can't get the flow/pressure were it needs to be, then I will look into a sump. Thanks for your feedback!
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