Re: this thing should mph better?
[Re: dart443]
#466811
09/13/09 01:21 PM
09/13/09 01:21 PM
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Joined: Aug 2003
Posts: 43,721 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,721
Bend,OR USA
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I think the Holley blue pump is the problem Been there done that Put a 250 or bigger pump on it My Duster with a set of Eddy RPM standard port heads(518C.I., 10.29to1 comp ratio) and a bigger cam with similar weight(3430 with me in it) runs 10:40 at 128.+ MPH with a 10 inch converter and 3:73 gears with 315x60x15 ET Street Rdials I had a Magnafuel 275 pump on it and I could not jet the carbs up enough to slow the car down, I switch to a Magnafuel 300 pump and it slowed down and made the AFR go rich with the same jetting that the car ran 128.+ mph this is a street & strip car ran with the exhaust on, air cleaner on and on pump gas
Last edited by Cab_Burge; 09/13/09 08:10 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: this thing should mph better?
[Re: Dodgem]
#466813
09/13/09 03:26 PM
09/13/09 03:26 PM
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Joined: Sep 2003
Posts: 1,267 Netherlands
72Challenger
pro stock
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pro stock
Joined: Sep 2003
Posts: 1,267
Netherlands
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I would guess it would pick up ET when you get bigger in the fuel pump, carb and convertor department. Your 60ft tells to run high 10's so for your launch the convertor can't be bad but the cam would like you to be sooner at higher rpms I guess. So basicly as most others suggested
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Re: this thing should mph better?
[Re: BradH]
#466815
09/13/09 05:10 PM
09/13/09 05:10 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
Various thoughts here... - it may be a fuel supply issue, but I think it's more likely a combination issue - Max Wedge-size Indy heads on 440-ish combinations don't work well from what I've been seeing, unless you spin the snot outta 'em (and your cam and intake choice don't suit that approach) - Demon 850 annular carb is an odd beast... pulls a lot of fuel through those boosters down low, then seems to choke at higher rpm
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Re: this thing should mph better?
[Re: dart443]
#466820
09/14/09 01:22 AM
09/14/09 01:22 AM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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Quote:
newbee 68 dart 440 ez headed hughes cam 613&626 250 256, 410 gear.ran yesterday 1.47 60 out the door at 11.26 119. what wrong with this combo
I think with the dual plane intake, you really need a larger carb. My 451 with a 252/252 cam, 0.613" lift was using a M1 single plane intake, a 1" open spacer, and a Holley HP 1,000 cfm carb. Before I got the HP carb, I ran a Holley 850, and I had to really richen it to tune it, and this is at Denvers 5,800 ft altitude. The 1,000 cfm carb was jetted pretty close out of the box and the car was faster by about 0.2 second, and a few MPH. I am not sure what altitude you are racing at, but the altitude here in Denver really slows my car down. The lowest altitude I have run at was Las Vegas, and the car wan 11.80's @ 115 MPH. Not great, but it is a #4,150 street car and I launch pretty easy for traction reasons stock suspension, with the large torsen bars, so not much weight transfer or traction.
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Re: this thing should mph better?
[Re: dart443]
#466821
09/14/09 10:33 AM
09/14/09 10:33 AM
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Joined: Jan 2003
Posts: 16,936 NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,936
NC
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Quote:
indy-2 manifold
If that is the Indy 440-2 intake, it is a single plane, max-wedge ports, 4150 single four barrel.
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Re: this thing should mph better?
[Re: 440Jim]
#466823
09/14/09 11:24 AM
09/14/09 11:24 AM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
Quote:
indy-2 manifold
If that is the Indy 440-2 intake, it is a single plane, max-wedge ports, 4150 single four barrel.
Ooops... I was thinking the same thing ("-2" = 2-plane).
Still, if he does have that big single-plane intake, it's not helping the torque in the range where his cam is best suited. I'm actually surprised it 60-fts as well as it does w/ the rest of the parts mentioned.
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Re: this thing should mph better?
[Re: dart443]
#466826
09/14/09 04:18 PM
09/14/09 04:18 PM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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Quote:
cam is installed at 104.5,single plane manifold
Sorry, I mis-read the intake type. I was running a 250 GPH pump and 1/2" (-8 AN) fuel line. On the Chassis Dyno the 451 HP peak was at 6100 RPM, so I usually shifted at 6500 RPM.
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Re: this thing should mph better?
[Re: Dodgem]
#466827
09/14/09 04:33 PM
09/14/09 04:33 PM
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Joined: Oct 2004
Posts: 8,166 Left Coast
BobR
master
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master
Joined: Oct 2004
Posts: 8,166
Left Coast
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Quote:
He has a 3/8 fuel line and pick up which I thought should be larger. maybe something to the lean as even though it has pretty big jets it showed lean on the plugs a few races back? with that big intake and max wedge port EZ's I'd be shifting it 7200 to 7400!!
Needs more fuel. Start here before doing anything else.
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