Kevin G

I have seen some big differentces in peoples base timing.... I just like to see what everyone is running and what mods have been done.

I personally had a 383 L98 with ported TFS heads, Lingenfelter. 219, 219 cam(straight up) and superram. For the life of me, I couldnt go past 8 degrees base timing or would get serious pinging and lose uper rpm power.....

Mark_ZZ3

I run 8-10. I don't recall now which, but I would have to look at the timing mark to recall.

I am running Edelbrock 6089 (64cc) heads and have a static compression ratio of 9.75:1. Premium gas. No pinging.

Although, I live at 2400 ft altitude, so that is a big difference.

I don't recall ever hearing a ping, but a scan shows the knock count, so it must be working.

What compression ratio are you running? What Prom?

Mark.

TRAXION

Timing set to 6º BTDC but then I have it adjusted via the MSD adjustable timing control to 9º BTDC.

Tim

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TRAXION's 1990 IROC-Z
Best Time = 12.587 @ 107.97mph (1.710 60ftr) on the long runner setup.
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels. Stock Wheels. No Weight Reduction.
Gunning for NA 11's with the MiniRam II and Hooker LT Headers.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org

quickL98

iTrader: (2)

mines at 10 degrees

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87GTA 355TPI,A4 shooting
for low 12'

IROCKZE

Mine's at 10, but I live at 5500ft. I wonder if 12 or more would work? I do run premium....

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85 IROC,tpi,t-tops,fully loaded,black with red l/s "camaro" interior,91 Bose system, Fastchip,TES,AFPR,K&Ns,92 police 700r4

"The devil drives a Camaro"

FJK

12 degrees, 88GTA, 5.7L, no mods except 200F coolant sensor, 89 octane fuel

Fredzep

iTrader: (1)

8-10 on my L98 w/76cc Heads. I haven't really tweaked it yet (<2K on Motor), but I think it is close to there.

Fredzep 90 GTA 350 5spd

kream-

mine is set to a max of 2 degrees btdc...
here in wichita kansas we only have 91 octane...
not to mention my stock tpi is strangling the zz4... and i dont have an afpr...
hopefully when i get those two things straightened out i can bump it up a bit more

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17 from Wichita, KS (previously newbieZ28)
1988 Iroc-Z ZZ4 tpi, ttops, 50k miles on chassis (edelbrock tes, stock tpi) free mods etc coming soon after first 1/4 times!
1985 Z28 LB9 option [STOLEN!] Click here to see

http://thirdgen.bawx.org
K.I.S.S - Keep It Simple, Stupid.

Jed

12 degrees BTDC. Edelbrock heads, 60cc chambers. No problems running 93 octane. I'm pretty sure my pistons are dished 4cc's.

How did Tim get his computer to make the little degree thingie?

raven350

Mine is at 0 degrees. When I was at 6 degrees I ran a best of 14.2... then I dropped it down to 0 and it ran a 13.8

Going up in timing just made it worse...

0 degrees initial = 36 total at 3000 rpm's

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Sportsman II 72 CC heads, Pete Jackson gear drive, Performance Resources chip, Edelbrock 1 5/8" headers and Edelbrock cat back exhaust, hi-flow cats, Trans-go stage 3 shift kit, Vigilante 9.5" 2800 stall convertor, SLP cold air induction, SLP roller camshaft, 24lb ADS injectors, AFPR, 3.45 rear end gears, and other goodies...

Mike89GTA

8*, what Ed Wright recommended

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4 bolt 350, 10.4:1 Compression, Edelbrock Aluminum Heads 6085, LT4 Hot Cam /w 1.6 full rollers (Crane), Scat Crank, SLP 1 3/4" Headers, SLP Cold Air Intake, Crane AFPR, 48mm TB, ported plenum, stock runners, Accel Super Ram intake manifold, 95Z #24 injectors, stock fuel rails, T5 Tranny, 3.45s, 9 bolt rear, 4 wheel discs, BFG Comp T/As rear, SZ50s in front, Alston SFCs, ES Trans Mount, ES front A-arm bushings, ES front sway bar end links

90IROCK

im running 13 degrees, my mods are chip, exhaust, and afpr

Lounge Lizard 6

8* BTDC w/ZZ4, ported TFS G1 heads, Crane 2032HR 214/220 cam, chip, 24# inj's, TPIS Bigmouth, ported plenum and SLP runners.

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Mike

'90 IROC-Z, 5-speed, ZZ4, Trick Flows
Moderator SEThirdgen

P J Moran

I'm running Edelbrock heads on a new short block. I've determined the CR to be nearly 10.0:1. I've backed off my timing from 10*, to 8*, to the current 4* and I still get some detonation (I think it's lessening, though). I guess I'll keep backing it off until it quits. How far can I go? Should I have to go this far? Could my ADS chip be causing the problem? I think I still have my original chip, should I try plugging it in to see what happens?

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'87 IROC 5.7l TPI - original owner!

Ed Z28 350

I'm new to these boards (and message boards in general) Anyway, I run mine at 10 degrees. I live in Miami and run 93 octane with no pinging.

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1986 IROC, 1992 Body Kit, 1989 5.7 IROC Engine, Crane Cam, CVX Exhaust, ADS Superchip, 24# FoMoCo Injectors, !Cat, 3:42 Gears, Modded MAF & Airbox

88SS6SPEED

iTrader: (2)

I run at 10 degrees with no problems, I've tried 8 and below with no good effect.

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88 Monte SS 355 TPI/LT-4 HOT CAM/AFR Hydra-rev/ T-56 6-Speed

Mark 89Formula

Kevin, I think the real question is how much total timing people are running, not base timing, where total timing is the BASE TIMING + PROM ADVANCE. Unless everyone is running the same PROM timing curve, comparisons are apt to be meaningless and potentially misleading.

For instance my custom PROM commands a maximum of 30 degrees of advance at WOT. Add my base timing of 6 degrees and you get 36 degrees of total timing. FWIW, I've run @ base timing values of 4 and 8 degrees on a Dynojet and lost power compared to 6 degrees.

My car likes 36 degs total timing with the current heads, cam, and intake. Yours might like something different.

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89 Formula 350, Accel Tri-Ys, 3" SLP, chip, Jacobs, SLP cold air, Probuilt tranny, Vigilante, 3.27s, Spohn torque arm & LCAs w/brackets, GW Subs

Alpine406

im running like 44 or 45 total timing
id have to hook up the laptop to fond out for sure.
it varies with the dfi to RPM, but its 43, 44, 45 all over.
i got afr 190 w/65cc, superram, 224-236 @ .050 525 LIFT
runs fine on 89 and up gas.
goes 12.70`s and better on e.t. streets or slicks on motor

Kevin G

Hey, thats a very good point Mark.

raven350

I agree with Mark.

My Performance Resource chip has 36 degrees into it. So I ahd to set my timing at 0 degrees to get my total of 36 degrees at 3000.

Worked like a charm...

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Sportsman II 72 CC heads, Pete Jackson gear drive, Performance Resources chip, Edelbrock 1 5/8" headers and Edelbrock cat back exhaust, hi-flow cats, Trans-go stage 3 shift kit, Vigilante 9.5" 2800 stall convertor, SLP cold air induction, SLP roller camshaft, 24lb ADS injectors, AFPR, 3.45 rear end gears, and other goodies...

DownUnderIROC

I set my base timing by doing some test runs with the AutoXray scanner, and looking at the amount of retard (degrees) from the knock sensor. With 6 deg base I was getting 5 to 7 deg of KS retard, at 8 deg it was worse. BTW I am running 92 octane R/M fuel.

I backed it off to 4 deg, and now I am seeing only 1 or 2 degrees of KS retard. This gives me the highest TOTAL timing, around 35 deg TOTAL at WOT.

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1987 Chevy Camaro IROC-Z
1998 Ford Falcon XR8
My IROC-Z in Sydney, Australia.
Thunder Down Under home page.