My 1/4 mile times

[rigon4]

This was my first time done the track so dont lol to bad. will list first to last run. My pos has a 502/th400/411gears/29inch tall tires

Reaction 1.2930
60 ft 2.0051
ET @ 594 8.6549
1/8 ET 9.2699
1/8 MPH 73.17
1/4 ET 14.7139
1/4 MPH 89.64

Reaction 1.1411
60 ft 2.4379
ET @ 594 9.1651
1/8 ET 9.7898
1/8 MPH 72.02
1/4 ET 15.2599
1/4 MPH 89.44

Reaction 1.0829
60 ft 2.3151
ET @ 594 9.0891
1/8 ET 9.7079
1/8 MPH 72.72
1/4 ET 15.1779
1/4 MPH 89.35

Reaction .8839
60 ft 2.0362
ET @ 594 8.7319
1/8 ET 9.3498
1/8 MPH 72.93
1/4 ET 14.7821
1/4 MPH 89.97

Reaction 1.0251
60 ft 2.4650
ET @ 594 9.2558
1/8 ET 9.8738
1/8 MPH 72.80
1/4 ET 15.3457
1/4 MPH 89.31

[Hottrucks]

whats your set up I would think that it would run better than 90 mph @ 14.80
seems that it pulls hard in the 1/8 but leans over on the top end?? what are you using for exhaust and carb

[rigon4]

the truck has stock suspension, a 750 holley and 3 inch exhaust with delta force flow master. a buddy of mine said it was the fuel lines the po has it ran in 5/16th line so he told me to run -08 lines for more than plenty fuel. he said it is nosing over way to soon. he has run that 1/4 for every when i went to tec he got mad at me for not having a helmet he said " you will run once and be done" because he thought i would run faster than a 14.00

[cableguy0]

i wouldnt run the truck very hard with 5/16 line. you are going to go extremely lean on the top. you need at least a 3/8's line and thats kinda small for a 502. -8 line would probably be the best way to go though not the cheapest. you could always run aluminum tubing its a ton cheaper and not too hard to run.

[rigon4]

it not to bad for -8 its like $350 of what i need

[mongoose]

that's a lot of stuff..

if you go though summit it can be real cheap

i did -8 in my car, with a new fuel pump and a log for my carb it was under 200.

[rigon4]

It is 310 from jegs that for every thing pulse extra

[Hottrucks]

not sure what he line is coming out of the tank but converting to an eltric pump with a lug before the carb would help alot....I would run 8/10 psi for daily driving then bump it up to 10/12 for the hot laps..then if you ever want to add a wet system your half way done

I'm not sure that 750 is enough I would need to find the flow rate for your heads??? we have a 429 with headers and the 750 isn't enough above 5500...also we stack 2 air filters so we get the flow though them....the equal amounts of air in/out is how you make power then jet accorddingly

[rigon4]

hottrucks i all ready have a holley blue pump on the truck the 502 does not have a fuel pump boss

[Super73]

I don't think it's really laying over on the top.. I use this equation and it's normally fairly close. The lower nummber is better suited for a truck being they tend to be high drag and big.

1/8 mile mph * 1.22-1.25..

So:
73mph * 1.22 = 89.06
73mph * 1.23 = 89.79
73mph * 1.24 = 90.52
73mph * 1.25 = 91.25

[rigon4]

super what does that mean 1.22 number

[Wild83C10]

you have a fuel pressure gauge?

What are some of the other specs on the motor?

The numbers do seem weak, but really depends on the rest of the motor.

[rigon4]

wild i have the pressure set at 6 psi and did not think to up it at the track and the motor is a GMPP off road 502


502 HO Tech Specs


Block Part Number: 10237292

Block Type: Cast iron with 4-bolt main caps

Bore x stroke (in): 4.47 x 4.00

Camshaft duration (@.050 in) 211 degree intake / 230 degree exhaust

Camshaft lift (in): .510 intake / .540 exhaust

Camshaft Part Number: 24502611

Camshaft type: Hydraulic roller

Compression ratio: 8.75:1

Connecting Rod Part Number: 10198922

Connecting rods Type: Forged steel, shot peened

Crankshaft Part Number: 10183723

Crankshaft Type: Forged steel

Cylinder head Part Number: 12562920

Cylinder head Type: Iron rectangular port; 118cc chambers

Displacement (cu in): 502

Engine Name: 502 HO:

Engine type: Chevy big-block V-8

Ignition timing: 36 degree total @ 3600 rpm, with vacuum advance disconnected

Maximum rpm: 5500

Piston Part Number: 12533507

Pistons Type: Forged aluminum

Recommended fuel: 92 octane

Rocker arm ratio: 1.7:1

Rocker arms Part Number: 12523976

Rocker arms Type: Stamped steel

Valve size (in): 2.19 intake / 1.88 exhaust

[Rodms]

Dang fellows we run 1/8 around here,If we go to memphis we can't run,do to specs!!!!

[69trk]

I have the same heads you have with alot of work done to them and they flow pretty good. It looks like to me your motor needs a turbo!!!!

[rookierodbuilder]

rigon4, i thing super is referring to the drag coefficient of the truck and how it affects trap speed.

[Super73]

It's a simple multiplier I have found that seems to be fairly close.. Take 69trk's sig numbers for instance. His 1/4mph is 115.81 and his 1/8mph is 95.18mpmh.

115.81/95.18=1.2167

Here are a few other examples.

Mine with the converter unlocked:110/90=1.2222

Reagan:151/123=1.2276

Big Jim: 141.4/116.7=1.2116

[rigon4]

super i see what you mean

[djracer]

Super73

Mine in 1.20 on and off the hose. What do you think that means.

[Super73]

By my math your 1/4 mph should be closer to 127.03na and 144.75. This is only a difference of 1.20mph NA and 2.17mph on the unit.

Perhaps your converter isn't all that efficiant?

Brakes draging?

Drag Coef is worse than us some how.. The top of your bed is skinned right? Perhaps that is causing air moving under the vehicled to build up back there? Does your gate go down? Put id down next time for a back to back comparo..

But these are just thoughts.. No factual info to support.

[djracer]

10/4 my gate doesn't drop but I will have a totally new combo and convertor.