Best timing with the dual nozzle SMC set up?

Chris Taylor · 09-01-2002, 05:44 PM

I have installed the dual nozzle SMC alky. set up. I have a Jim Testa 19* chip I am running now. I was wondering what would be a good timing change to start with? I was thinking around 24-25* to start with. I assume that the fuel tables would need updating for the higher boost and timing levels.?

I know this will depend on my set up. I have the following:

.030 over hyps. file fit rings
TE-44
009's w/ Jim Testa's 19* chip
Power Plate
Ported irons w/ big valves
T&D 1.55's
Comp 212/212
Stock big neck I/C
3" DP w/ Deltagate
340 hot wired
Dual nozzle SMC w/ #10 Jets
Mod D5 converter 3000 stall

TIA

------------------
86 GN
87 T Yellow
87 T Silver

salvageV6 · 09-01-2002, 06:02 PM

Race Track or street daily driving?

24 is kinda high might get some KR there on the street.

Steve Wood · 09-01-2002, 06:02 PM

You may be able to get away with more timing. I have run as much as 24 degs on my car on alky and others have run even more.

One thing that I have noticed is that transitional knock can be a problem when running more timing. By this I mean that detonation may occur when standing on it from a cruise but not when hitting it from a standing start.

My MaxEfforts have variable timing in them which seems to help this problem. As I have two cars set up this way with slightly different timing curves, I cannot remember the specifics but....my son's combo is pretty close to yours and I think his car has something like 21-22-23 degs in the first 7 positions and 22-23-24 degs in the last 8 tw positions. These are wot timings and the first number (22 or 23) is in effect until the rpm hits 3000 rpm or so and then it begins to ratchet up to the higher number. This way, when cruising and stepping on it, the timing starts at either 21 or 22 degs and detonation is minimized/eliminated but timing kicks on up once the "Kick down" load has been absorbed.

From a low gear start, there was no problem and he could run 24 degs all the way as the load on the engine is much less in low gear.

I believe my car runs a degree less and the second set of tw positions is fixed at 24.

Many things affect the timing....turbo size, IC type, camshaft type, etc.....for some reason, larger turbos don't seem to stand as much timing as smaller ones....big cams reduce cylinder pressures at lower rpms, and so on.

Only way I know is to get Jimmy to make some different chips and try them.

Steve Hill, who I think still runs a similar combination, cranks it way up but he uses a bunch of aquamist nozzles and really fogs it in there...

09-01-2002, 05:44 PM	#1 (permalink)
Chris Taylor Registered User Join Date: Nov 2001 Location: NC Posts: 156	Best timing with the dual nozzle SMC set up? I have installed the dual nozzle SMC alky. set up. I have a Jim Testa 19* chip I am running now. I was wondering what would be a good timing change to start with? I was thinking around 24-25* to start with. I assume that the fuel tables would need updating for the higher boost and timing levels.? I know this will depend on my set up. I have the following: .030 over hyps. file fit rings TE-44 009's w/ Jim Testa's 19* chip Power Plate Ported irons w/ big valves T&D 1.55's Comp 212/212 Stock big neck I/C 3" DP w/ Deltagate 340 hot wired Dual nozzle SMC w/ #10 Jets Mod D5 converter 3000 stall TIA ------------------ 86 GN 87 T Yellow 87 T Silver __________________ 86 GN Sold 2/07/04 87 T Yellow Sold 87 T Silver

09-01-2002, 06:02 PM	#2 (permalink)
salvageV6 Registered User Join Date: Sep 2000 Location: Connecticut, USA Posts: 6,431	Race Track or street daily driving? 24 is kinda high might get some KR there on the street. __________________ WE4, 155K, Daily Driver, DBLBBGT70, 55lb.Inj., Pedophile DP, hollow cat.,Schertz Hi-Pro and 3200Protorque, Postons Headers, 2 1/2"SS Ultraflows and pipes, Ex.Ext. alky chip, EGT/Bilsteins, Boxed Cont. arms/Airbags/snubber,Blizzak snows, Nittos 275/60DR, 307, adj.reg./ SMC alky dual, 9 gauges,scamaster and D.Scan,BSTC, translator and 31/2"MAF, V4 inter. DYNO. TESTED!!! 11.93 @ 113.7 GN loaded, car #2. 115K miles. Accufab reg.,Scanmaster, Reds 100 chip, Mease downpipe, Mease 15row stretch IC, hollow cat., ATR ss. 3"crossflow, SMC alky., J.J. 62mm.T.B., RJC power plate, Bilsteins, Moog springs, HR Parts mount and rear arms, Nittos. "Some Cars Like Lots Of Fuel Pressure and Some Cars Are On Blocks." 12.4 @ 111

09-01-2002, 06:02 PM	#3 (permalink)
Steve Wood An American American Join Date: Sep 2000 Location: East of Eden, Texas Posts: 37,175	You may be able to get away with more timing. I have run as much as 24 degs on my car on alky and others have run even more. One thing that I have noticed is that transitional knock can be a problem when running more timing. By this I mean that detonation may occur when standing on it from a cruise but not when hitting it from a standing start. My MaxEfforts have variable timing in them which seems to help this problem. As I have two cars set up this way with slightly different timing curves, I cannot remember the specifics but....my son's combo is pretty close to yours and I think his car has something like 21-22-23 degs in the first 7 positions and 22-23-24 degs in the last 8 tw positions. These are wot timings and the first number (22 or 23) is in effect until the rpm hits 3000 rpm or so and then it begins to ratchet up to the higher number. This way, when cruising and stepping on it, the timing starts at either 21 or 22 degs and detonation is minimized/eliminated but timing kicks on up once the "Kick down" load has been absorbed. From a low gear start, there was no problem and he could run 24 degs all the way as the load on the engine is much less in low gear. I believe my car runs a degree less and the second set of tw positions is fixed at 24. Many things affect the timing....turbo size, IC type, camshaft type, etc.....for some reason, larger turbos don't seem to stand as much timing as smaller ones....big cams reduce cylinder pressures at lower rpms, and so on. Only way I know is to get Jimmy to make some different chips and try them. Steve Hill, who I think still runs a similar combination, cranks it way up but he uses a bunch of aquamist nozzles and really fogs it in there... __________________ ------------------ 'A government that is big enough to give you everything you want, is also big enough to take away everything you have.' - Thomas Jefferson I think one should worry more when people are lining up to get out of a country rather than into it. If they're sneaking in, we must be doing something right. The Chronicles of Zap, from the early 21st century www.vortexbuicks-etc.com

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode