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#21
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Just an FYI I think your engine is making more power than you give it credit for. Look at Caster1 build he did just a few weeks ago and look at his numbers. You should be up around there. I too am gonna run the holley sniper and wonder what my timing curve needs to look like. I am concerned about doing damage to the engine trying to get my timing set perfectly so before I really start driving it I am gonna take it to a chassis Dyno. Hopefully that step will get me my most return on investment. I have a lot of money in this build and plan on driving it about 8000 miles a year so I can’t afford to make errors
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468/TKO600 Ford thru bolt equipped 64 Tempest Custom. Custom Nocturne Blue with black interior. |
#22
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This is from FiTech tech responses:
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Changing the timing from the handheld is awesome! It sure beats smacking your head under the hood trying to tweak a distributor. I still want to map out the timing for the 5.3 in my GMC truck using my OBDII interface and Android app. I just haven't got around to it yet. I'm gonna bet there are some super smart engineering dudes who got paid a lot of money to figure this out.
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"...ridge reamer and ring compressor? Do they have tools like that?" |
#23
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Thanks for the response, Dale
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1969 428 Tremec 5 Speed U.S. Army Retired Retired Helicopter Pilot |
#24
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What engine are you running with those timing numbers and how is your engine setup? Dale
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1969 428 Tremec 5 Speed U.S. Army Retired Retired Helicopter Pilot |
#25
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I'd start with about 8 degrees cranking, 15 degrees idle, 38 degrees WOT, and 44 cruise with your setup. Increase the cruise in 2 degree increments up to 48, after it self tunes the fuel a bit (if you get pinging under light throttle, back it off to the previous setting where it didn't ping).
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"The Mustang's front end is problematic... get yourself a Firebird." - Red Forman |
#26
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Dale
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1969 428 Tremec 5 Speed U.S. Army Retired Retired Helicopter Pilot |
#27
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Shouldn't need that much crank timing as long as you have the proper amount at idle. That much timing can put a lot of unnecessary load on the starter, which will wear it out quicker. And it may even make the vehicle hard to crank over when hot, or the battery is really cold. Regarding your question about when to to have the mechanical all in: On a conventional distributor, if you bring the mechanical in too fast, you might end up having to limit the total you can put in @ WOT. For example, lets say the engine can only handle 35 degrees at 2500, but prefers 40 at 3000rpm, and your advance comes all in @ 2500rpm: If you set it to 40 degrees total, you'll have too much between 2500-3000rpm, which @ minimum means lost power, and worst case damage the engine. If you only set it to 35 degrees, then you've given up power from 2500 to max rpm. That's the beauty of a fully programmable system; you can create a load/rpm map that optimizes the advance at various points (with interpolation in between) for max power (and fuel economy) across the entire speed/load range. Holley's system appears to be a simplified version, letting you put in key points, and then it estimates the map from that. Not as accurate as creating a map from scratch by running an MBT sweep with a dyno, but probably a step above a conventional distributor. BTW, I'd start with the 38degrees max WOT, until the fuel learns. Then like the part throttle timing, if you want you can try adding more (I'd do 1 degree at a time). However, not all detonation is audible (especially when driving), and sometimes too much timing can still cause power loss without detonation. So best if you can do tune that portion on a dyno, where you can watch for power loss as well as listen for knock.
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"The Mustang's front end is problematic... get yourself a Firebird." - Red Forman Last edited by amcmike; 02-13-2019 at 07:49 PM. |
#28
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Quote:
Dale
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1969 428 Tremec 5 Speed U.S. Army Retired Retired Helicopter Pilot |
#29
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Just wanted to update this thread. I finally decided to put the Holley Sniper on my car. I used their Muscle Car sending unit and in tank pump so I did not have to run a return line and got their Hyperspark distributor for Pontiacs. Delaying a year was a smart idea because they now offer a Pontiac Hyperspark. I kept my Mallory 6AL ignition box and Mallory Coil. I also set it up where the EFI controls the timing. I ended up replicating the timing curve that was set up for the engine years ago. I am using 8 degrees cranking, 12 degrees idle, 36 degrees WOT, and 42 degrees cruise. I tried other settings but the car does best at these numbers. I am still fine tuning it a little to get rid of a rich condition during warm up, but WOW, now the engine responds and has the power that I thought it should have. I can be at 2000 RPM in second or third gear and mash it to the floor and my expensive sticky tires will instantly break and the car will start fishtailing. Very happy with the switch and adding the EFI. The Muscle Car sending unit module really made the install a lot easier. It is actually a fairly simple install, just requires a lot of preplanning and rewiring.
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1969 428 Tremec 5 Speed U.S. Army Retired Retired Helicopter Pilot |
#30
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Good work. Welcome to modern tuning. I enjoyed the education I got when I switched.
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'65 Tempest 467 3650# 11.30@120.31 |
#31
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Dale
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1969 428 Tremec 5 Speed U.S. Army Retired Retired Helicopter Pilot |
#32
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120 '66 Pontiac GTO - 389, 4 speed street cruiser |
#33
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It is amazing how much more responsive the engine is. In my case it untapped a lot of power that I wasn't getting with the carburetor. I know if the carburetor was tuned properly it would perform the same but I am not that good with carburetors. But it is amazing that with the same knowledge I was able to get the EFI running very well and now the engine is a beast..
Dale
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1969 428 Tremec 5 Speed U.S. Army Retired Retired Helicopter Pilot |
#34
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Another thing to remember with a good engine management system is it doesn't control JUST fuel. Timing is as, if not more, important to control.
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120 '66 Pontiac GTO - 389, 4 speed street cruiser |
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