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Old 09-07-2005, 09:00 PM
juiced66malibu's Avatar
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Great Low-end but poor Top end

I was at the track on Labor day. My Chevelle ran consistent 12's but looking at my timeslips, my 1/8 was pretty good but I noticed the numbers in the Top end was weak. I am lossing a lot at the top end. Someone told me that I should get an electric fuel pump to eliminate fuel starvation for my Chevelle. I didn't use my NOS and left the Gear Vendor on auto.

Here's a little info on my car:

ENGINE:
Type: Blue-printed 383 stroker by Speed-o-motive
Pistons: JE Forged Pistons
Heads: Dart Iron Eagle 200cc - port and polished by Baca Racing, 4 inch bore/6 inch rods, new springs
Compression ratio: 10:1

Camshaft: Comp Cams hydraulic roller
Stroke 3.75
0.539/0.558-inch lift
296/304" degrees advanced duration
MSD Distributor
Melodon Oiling System
Cloyes double-roller timing chain
Roller Lifters
Roller Rockers
Fluid Dampner
Cooling System:
Pair of 13 inch thermostratic controlled fans
Be-Cool radiator, rated to cool up to 750 hp
Induction:
Mighty Demon 750cfm
Edelbrock Air-Gap Manifold
Power Adder: NOS - 200 hp Nitrous two-stage wet system, purge valve, dedicated fuel pump and 1 gallon mini fuel cell
Exhaust: Sanderson Custom Headers
FlowMasters Race Mufflers
3-inch mandrel-bent exhaust

Transmission:
Beefed up TH350
Gear Vendor Overdrive (tachs at 3,000 rpm at 75 miles an hour)
Line Loc

Rear End:
4.11:1 ratio gears, Posi
Chassisworks Fab9 (9 inch) rear-end with Strange third member, 2,800 - 3,000 stall converter
35 spline trach-tech locker
Chrome moly yoke
Balanced Driveshaft

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Last edited by juiced66malibu; 09-08-2005 at 07:34 AM.
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Old 09-07-2005, 09:31 PM
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Are you still running a stock-style fuel pump? If you are, there is one major problem there for you.
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Old 09-07-2005, 10:30 PM
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Folks always like to spend other folks money, therefore no need to go out and buy an electric pump if you don't know your fuel pressure on the big end of the track. So what I'd suggest is you hook up a pressure gauge and make a run and see what it does.

A plug chop at end of the run would also tell if you are leaning out.

The other nice thing would be a time slip. Your MPH will give you an idea if your making any power. Actually, turning 12's with that motor in a Chevelle doesn't seem that bad.
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Old 09-08-2005, 05:48 AM
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quick ? is that duration @.05 number correct?
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Old 09-08-2005, 08:02 AM
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Opps that definitely isn't right.
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Old 09-08-2005, 08:03 AM
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Here is my timeslip: I am a rookie racer. My R/T time needs a lot of improvement. R/t .611; 60' 1.87; 330' 5.296; 1/8 8.180; MPH 85.23; 1000' 10.67 1/4 time: 12.81 MPH 104.99. All my other runs were very much the same, more or less.
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Old 09-08-2005, 09:22 AM
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What RPM you turning through the lights. Id' say your pretty close but you might geta liitle something by playing with what your have. Check your plugs for mixture problems, check your timming advance, make sure your not floating or bouncing valves, or your trans slipped etc...
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Old 09-10-2005, 04:20 PM
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Quote:
Originally Posted by johnsongrass1
What RPM you turning through the lights. Id' say your pretty close but you might geta liitle something by playing with what your have. Check your plugs for mixture problems, check your timming advance, make sure your not floating or bouncing valves, or your trans slipped etc...
All good info from these guyes

-often running LESS timing at the top end pull will increase your mph...

-digressing...... Like he asked, what is your fuel pressure on the top end? How do you know it might be a fuel problem?
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Old 09-11-2005, 02:11 AM
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I am not sure about the fuel pump and I am not sure if a fuel pressure thing or not. I do have an old mechnical fuel pump in the Chevelle that is about 5 years old.

I am thinking about putting in a 3500 stall converter and maybe steeper gears. I would like to go in the 11.5 range on the engine alone. NOS will come later with the cage.
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Old 09-11-2005, 03:36 PM
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Quote:
Originally Posted by juiced66malibu
I am not sure about the fuel pump and I am not sure if a fuel pressure thing or not. I do have an old mechnical fuel pump in the Chevelle that is about 5 years old.

I am thinking about putting in a 3500 stall converter and maybe steeper gears. I would like to go in the 11.5 range on the engine alone. NOS will come later with the cage.

********
Looks like you have to find another 175 horsepower somewhere, eh?

If you can find the horsepower, the converter rpm will increase because of your increased power.
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Old 09-11-2005, 10:17 PM
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I already have a 200 dual shot nitrous system. I was saving it until after I installed the roll-cage. With my current set-up it is geared towards using nitrous. So you think that the 3500 stall/tall/wide slicks won't get me into 11.5 range alone, if that is true then I won't need roll bars.
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