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Stock 360 output |
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5798 |
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Posted: Nov/06/2018 at 4:45am |
Updates here:
http://www.theamcforum.com/forum/aussie-gremlin_topic96598.html Thought I would start a new thread given that it’s not really stock anymore, never was in hindsight, now 12.3 @ 111 mph, so definitely sorted out a few issues. |
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I've finally given up drinking for good...........now I only drink for evil.
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WhatISit
AMC Addicted Joined: Aug/07/2017 Location: Phoenix, AZ Status: Offline Points: 0 |
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Any updates?
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5798 |
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Out she comes: |
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Red20
AMC Addicted Joined: Jan/29/2013 Location: Oceanside CA Status: Offline Points: 1556 |
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There’s no doubt a well tuned carb can perform extremely well and in terms of WOT dyno numbers or fuel economy numbers, and if done right, will match the performance of EFI. But that’s the exception, not the rule. And I’d like to meet the guy who can tune a carb to beat both fuel economy AND performance numbers at the same time with the same tune. But what a lot of folks don’t realize is that even the best “wide band tunes itself” bolt on EFI system (90% of them throttle body carb replacements) isn’t just magic right from the get go. There’s still some tuning involved to get the max performance and efficiency people are hoping for from these things. That said, I’ve run both and I really value the experience and engine knowledge I gained from learning to tune my EFI setup. I’m running a carb now in the Hornet and though it seems to run fine, I am itching to hook up an O2 sensor and gauge. I learned enough with EFI the know there’s no doubt I’m leaving a lot on the table. There’s a lot you can do with a vacuum gauge at idle, but how much of my daily driving is done at idle?
Well, that’s a departure from the theme of your thread, WesternRed, sorry bud. And I’m sure I’m preaching to the choir here with this audience. Just stuff that was on my mind. |
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1969 Javelin SST "Screamin' Banana" - Totaled Feb 2018
1973 Hornet Sportabout X "yellajack" - 360/727/TracLoc DAILY DRIVER |
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70amcpwr
AMC Addicted Joined: Feb/16/2011 Location: Moultonboro NH Status: Offline Points: 1485 |
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Carbs are easier, they can't "compensate" for your adjustments, you change it and it works or it doesn't.
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70amcpwr You just can't fix stupid.
SOLD 1970 BBO Javelin, wifes 73 AMX 360 4spd. Next project 1969 AMX |
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5798 |
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I only got around to finally downloading the Sniper configuration just before the last night out and still don't know what most of it means. I have a lot of learning to do there, but I'm sure it's really no different to learning how to tune a carby properly.
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Red20
AMC Addicted Joined: Jan/29/2013 Location: Oceanside CA Status: Offline Points: 1556 |
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I had all kinds of issues at first with the QFI system. From the factory, there was an entire line of zeros across the VE table at 2100 RPM so it would stumble as I accelerated through 2100 RPM. Also, I was getting a crazy rich spike on deceleration on the order of about 10:1. And the TPS, though functioning, had a lag that wouldn’t give me a “pump shot” unless I double pumped the throttle when going WOT. Lots of little issues, so I bolted on a Quick Fuel SS 680 and shelved it for a Jeep project that never materialized and ended up selling/trading it for a TCI converter eventually. I like everything about the QFI carb except for the lack of a choke pull off. They just slot the back side of the choke blade to allow some air to be pulled past when the blade is closed. No adjustability at all other than opening rate. Makes it a pain in temperate weather. It would probably work ok in actual cold weather.
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1969 Javelin SST "Screamin' Banana" - Totaled Feb 2018
1973 Hornet Sportabout X "yellajack" - 360/727/TracLoc DAILY DRIVER |
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Red20
AMC Addicted Joined: Jan/29/2013 Location: Oceanside CA Status: Offline Points: 1556 |
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I’m not a VE table expert, but I found with the Quick Fuel QFI system I used in the past that if I looked at the areas of the table where the biggest % of corrections were being made, I could increase/decrease pulse width in those areas to get the base map closer and reduce the amount of correction being applied. A few weeks of honing the base map helped a good bit as the computer wasn’t trying to do so much work. And yes, fuel enrichment settings helped. There was fast and slow throttle enrichment, decel cutoff, etc., etc. to work with. Adjusting AFR targets to be ideal across the range made a difference also.
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1969 Javelin SST "Screamin' Banana" - Totaled Feb 2018
1973 Hornet Sportabout X "yellajack" - 360/727/TracLoc DAILY DRIVER |
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5798 |
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I hindsight I shouldn't have advanced the cam and spent a bit more time on tuning instead. I'm surprised that nobody mentioned "lean bog" from the sniper data log posted a couple of pages back when the new cam was installed. The EFI only self tunes up to a point, some stuff still needs a bit of manual help like acceleration enrichment (equivalent to Holley pump shot). Had a little bit of a tinker with that on the last night and that's how I got a bit of 60' back, but it was still far from perfect.
I don't think the Sniper really offers anything more than a well tuned Holley in terms of fuel and air delivery, but the data logging feature is pretty impressive and it's something I've got to put a lot more time into understanding once everything else is a bit more settled. |
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Red20
AMC Addicted Joined: Jan/29/2013 Location: Oceanside CA Status: Offline Points: 1556 |
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I gotta say it again - I enjoy the “figure it out” nature of your thread here. Guys like myself don’t have much in the budget to make power and speed with dollars, so it’s an exercise in budget conscious tinkering to do more with less and strive to understand the car as well as possible. I added an additional full sized leaf with the eyes cut off and clamped all of the leafs forward of the rear axle after talking to an old timer once and was amazed at how much better my Javelin hooked up. Didn’t cost me a dime as I carefully removed and reused leafs and leaf clamps from another set of leaf packs I had lying around.
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1969 Javelin SST "Screamin' Banana" - Totaled Feb 2018
1973 Hornet Sportabout X "yellajack" - 360/727/TracLoc DAILY DRIVER |
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