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Old 05-17-2003, 12:29 AM   #1
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Join Date: Oct 2002
Location: Salem, NH
Posts: 1,851
Car: 1999 Z28
Engine: LS1
Transmission: 6 Speed
Axle/Gears: 9" 4.11 Truetrac

Classifieds Rating: (1)
The Little 305 That Could

this car just keeps on impressing me. last fall i ran a 13.9 @ 97.08 with:
Ported Plenum
Centerforce Dual Friction
Poly Tranny Mount
Poly Torque Arm Mount
Modified Air Box
K&N Filters
Dynomax Headers
Dynomax Cat Back Exhaust
Hollowed Cat
Throttle Body Coolant Bypass
IAT Sensor Relocated
Emissions Delete
AC Delete
No Spare Tire, Jack, Rear Seats

Now My Best Times are 14.2 @ 99.76 with a 2.3 60ft and a 14.3 @ 100.2 with a 2.4 60ft
With:

LT1 Cam
Ported Plenum
Centerforce Dual Friction
Poly Tranny Mount
Poly Torque Arm Mount
3.27 9 Bolt Rear
Modified Air Box
K&N Filters
Dynomax Headers
Dynomax Cat Back Exhaust
Cat Delete
Throttle Body Coolant Bypass
IAT Sensor Relocated
Emissions Delete
HVAC Delete
12* Base Timing
No Rear Seats, Spare Tire, And Jack
Toyo Proxes FZ4s
Descreend MAF

i was running 97-98mph with the stock MAF unit. then my friend let me use his gutted MAF sensor and i went the 14.2 @ 99.76 and the 14.3 @ 100.2. so the LT1 cam made the car run a lot leaner, with the gutted MAF it ran a lot richer. this explains why i didnt get a whole lotta difference between the stock cam and the LT1, but now i do!





and yes it is a 305 the block says 5.0L G on in the cast on the back side.
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Old 05-17-2003, 12:58 PM   #2
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great times, your 60 foot needs some help now, maybe an adjustable torque arm might be something to think about or lower control arm relocation brackets.

Last edited by MdFormula350; 05-17-2003 at 01:03 PM.
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Old 05-17-2003, 03:44 PM   #3
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Join Date: Jul 2001
Location: Buffalo, NY
Posts: 4,699
Car: 1988 IROC-Z
Engine: H/C/I L98
Transmission: Modified 700R4
Axle/Gears: Moser 12 Bolt / 3.73 TrueTrac

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Great times!


Why does a gutted MAF make your car run richer?




Thanks
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L98 with a little AFR, and a bit of comp cam (316 rwhp). - [Idle Clip]
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Old 05-17-2003, 06:45 PM   #4
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Join Date: Apr 2001
Location: Diamondhead, MS
Posts: 930
Car: 89 20th Ann. TA
Engine: Turbo 3.8 V6
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Axle/Gears: 3.27

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305's can do the job. My 84 HO Z28 ran a best of 13.89 back in '87. Once you get those short times down to at least 2.0, you should be running 13.5 or better.

And of all the gutted MAFs that I've used and heard of, it leans it out. More air flow coming in with the old calibration makes for a leaner mixture.

Congrats!
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Old 05-17-2003, 07:25 PM   #5
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Quote:
Originally posted by TTA 1387
305's can do the job. My 84 HO Z28 ran a best of 13.89 back in '87. Once you get those short times down to at least 2.0, you should be running 13.5 or better.

And of all the gutted MAFs that I've used and heard of, it leans it out. More air flow coming in with the old calibration makes for a leaner mixture.

Congrats!
i agree
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Old 05-17-2003, 07:52 PM   #6
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Join Date: Nov 2002
Location: bricktown n.j.
Posts: 260
Car: 1991 z-28
Engine: 434--654hp---601 torque
Transmission: ATI POWERGLIDE
Axle/Gears: mose 9" / 411 gears

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good job!
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SEE IT RUN...
http://vids.myspace.com/index.cfm?fu...oid=2022092869
1.28-60ft.
5.81-1/8@ 121.06
9.10-1/4
150.6- mph

scott shafiroff build 434--12:1 comp, motown block, comp cam 254 dur. 594 lift,, callies crank, afr227 heads, dart intake, lunati rods, king demon 1095 carb, msd ignition, stahl 2" jet hot headers, ATI powerglide w/transbrake,ATI 5000stall,moser 9" 4:11's w/spool,35 spline, PA tubular k-member, wolfe racecraft rear sway bar, wolfe racecraft adj. panhard bar,90/10 drag struts, 50/50 drag shocks, adjustable lca, lca relocation brackets, 10 pt., 28" phoenix slicks 200shot. 9.91@136 N/A
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Old 05-18-2003, 01:14 PM   #7
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Location: Tucson, AZ
Posts: 970
Car: 1992 Camaro RS
Engine: Balanced and blueprinted 383ci
Transmission: Pro built 700R4
Axle/Gears: Auburn 3.42

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Do something about those 60ft times man. 2.45 and 2.33... Pull those down to around a 2.0x and you'll be all over the 13's consistently. Nice times.
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Old 05-18-2003, 01:58 PM   #8
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Quote:
Originally posted by MdFormula350
great times, your 60 foot needs some help now, maybe an adjustable torque arm might be something to think about or lower control arm relocation brackets.
I agree. Those are still some good times for a 305.

Why go with the LT1 cam? That isn't much of a step up from the 5 speed 305 TPI cam - and all that work...

BTW - In that first run, what did you race, an 03 Cobra? 17.4@74 doesn't belong at a track. If you've got a car that slow, quit taking up space
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Old 05-18-2003, 02:02 PM   #9
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Join Date: Jan 2001
Location: Tucson, AZ
Posts: 970
Car: 1992 Camaro RS
Engine: Balanced and blueprinted 383ci
Transmission: Pro built 700R4
Axle/Gears: Auburn 3.42

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Quote:
Originally posted by Marc 85Z28
17.4@74 doesn't belong at a track. If you've got a car that slow, quit taking up space
Amen.
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Old 05-18-2003, 02:46 PM   #10
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Join Date: Oct 2002
Location: Salem, NH
Posts: 1,851
Car: 1999 Z28
Engine: LS1
Transmission: 6 Speed
Axle/Gears: 9" 4.11 Truetrac

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haha the 17.4 was my freinds lifted up ford F 150. i choose the lt1 for reliability issues, i dont have time to burn computer chips or deal with a tempermental engine. i put 2k miles on this car in three weeks so i gets driven a lot. definitly needs traction work haha 1st and 2nd gear rubber at the track is not good. i have no idea why it runs better with a descreend maf my BLMs at idle are 134 with the stock one and it seems to run a **** load better with mine descreend now. i hate hacking things and i used to tell people how bad it was to descreen but it seems to be doin better with em out? is it possible im excedding the 255 grams per second flow rate the computer is capabil of reading?
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Old 05-19-2003, 04:12 PM   #11
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Car: 82 Berlinetta(2)/57 Bel Air
Engine: LS1 (LS1)/LQ4
Transmission: 4L60E (T56)/4L80E
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Your times were slower but your trap speed went up?
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Old 05-19-2003, 09:49 PM   #12
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Car: 1999 Z28
Engine: LS1
Transmission: 6 Speed
Axle/Gears: 9" 4.11 Truetrac

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yeah i cant hook up for **** now. 4 tenths slower off the line is 8 tenths slower at teh end of the track, a 2.0 60ft would get me a 13.5 or 13.6. it needs suspension mods badly
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Old 05-19-2003, 09:49 PM
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