Racereg76

Hello I am new to the forum I just recently built a 03 lq4 stock bottom end with arp rod bolts for my 85 Monte Carlo as I bracket race the car it have 862 ported head a victor Jr carb intake and a 750 double pumper with a ho main body my first pass was 12.11@111 with timing at 28 degrees in at 2000rpm I'm thinking the car should have gone faster I would like you guys input

redtan

iTrader: (5)

All that greatly depends on a lot of other things:

cam specs
compression
who ported the heads
transmission
converter
rear end
weight of the car
tires
suspension
DA of the track
ambient temperature and humidity that day

Racereg76

Cam is a srd cam spec if I remember is like 610/598 232/240@50 with 108 heads where ported by a guy I've been use for a couple of years in nj head flow 310@650 car weights 3550 with me I have 4500 edge convertor 4.11 gears compression I guess should be around 10 with 862 5.3 heads car has tubular upper and lower control arm anti roll bar the car was getting 1.57 to 1.60 60ft wit my 383 going 11.30@120

jerr6

iTrader: (1)

I have kinda similar setup. 3680lbs. 3500 stall 3.73 gears. Full street car. Run 11.80s @116. I have 35 degrees timing. And I'm under or right at 10:1 compression

Racereg76

jerr6 how quick do you have your 35 degree coming in at what rpm im new to tuning with this ls motor i have read it different from older sbc

jerr6

iTrader: (1)

I'm pretty sure it's all in by 2500rpms

ZONES89RS

iTrader: (25)

This sounds like I'm getting old, but I think my LQ4 with stock milled heads and a Trex cam went 11.18 at 121 in my 89 RS. That was a 1.55 60 foot, car was 3450 with me in the seat. Seems you should get more out of it. Wonder if you have a converter issue or something else?

Doug G

Mine ran best with 36*....but you'll need to see what yours wants

Here are a few slips. #218 car

32*......34*......36*........38*(detonation and got out of the grove )

baronsmith98

iTrader: (2)

Doug did you make multiple passes with each timing setting or just make one at 32 and one at 34 and so on?

jerr6

iTrader: (1)

This is on street radials too and a terrible 1.8-60' time. Bump up the timing at the track till u stop gaining mph. Make sure you are getting WOT at carb. Sounds stupid but I found out my gas pedal was bent. Went .20 faster after I fixed it

TXsilverado

iTrader: (18)

What does your timing curve look like? my best times came from a flat timing table. It also drove better on the street like that.

jerr6

iTrader: (1)

What rpm are you shifting at ?

Racereg76

I have my timing curve at 30 flat out starting at 2000rpm I try both 28 and 30 no change in mph et or 60ft I am shifting at 6000

jerr6

iTrader: (1)

I shift at 7000-7200 on completely sbe 05 lq4.

TXsilverado

iTrader: (18)

what's your timing below 2k? I would run mine at 31* flat from 1,000 RPM to redline.

Doug G

1 each...time limited
Almost hot lapped...just enough time to load up new table and off again.

Racereg76

Below 2000 initial is at 20 and ramps up to 30 by 2500

Racereg76

I also have ngk tr6 plugs gap at .35

TXsilverado

iTrader: (18)

I always run tr55 gapped around .55 for n/a combos. you're good for a shot of nitrous with that plug.

Racereg76

Quick update guy thank you for your input now I have a good starting point went to the track again today I bump the timing up to 34 degrees and gap the plugs to .45 and the car picked up went 11.52 first time shot shifting at 6000 rpm