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Gremlin Traction Woes |
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PHAT69AMX
AMC Addicted Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5919 |
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What P.S.I. hot in the tires?
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5799 |
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I normally run 16-18 psi, did drop them to 14 last time when it wouldn't hook up and it didn't really seem to help.
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I've finally given up drinking for good...........now I only drink for evil.
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PROSTOCKTOM
Supporter of TheAMCForum Joined: Jun/20/2010 Location: Indiana Status: Offline Points: 2450 |
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Tom
Edited by PROSTOCKTOM - Oct/20/2020 at 6:19am |
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Molnar Technologies Full Service Dealer - Crankshafts & Connecting Rods
1969 AMC Rambler Rouge Race Car 1974 AMC Hornet Hatchback, Wally Booth Outlaw Nostalgic Pro Stock Race Car Project |
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XJ6
AMC Nut Joined: Jul/09/2020 Location: SW Status: Offline Points: 293 |
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Now that's what I'm talking about. I notice the front end actually squats on the line and it has way more suspension movement than mine. Would love to know what the suspension specs are on that thing. And here they are: Up front, the suspension is stock AMC with Viking double adjustable shocks. At the rear Caltracs traction bars, split mono-leaf springs, and double adjustable Viking shocks complement the Ford rear. |
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5799 |
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From reading one of the articles on that Gremlin, the Caltracs made a big difference, so that’s probably a consideration.
Looking for alternatives to the Opentracker spherical bearing conversion, maybe just order some Heim joints from Speed Motors. Does anybody make a tubular upper arm that works with the factory spring mounts?
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I've finally given up drinking for good...........now I only drink for evil.
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XJ6
AMC Nut Joined: Jul/09/2020 Location: SW Status: Offline Points: 293 |
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Looks like Control Freak offers a control arm kit that includes the Viking shocks |
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5799 |
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The control freak setup looks nice, but maybe overkill for what I'm trying to achieve.
Roll on with the quick fixes for now, front shock spacers: Gives me this much extension, which is about 1/2" more than before given other limitations that come into play. Hard to imagine it ever gets anywhere near this high on the track: Probably going to have to lower the front and look at some options to get rid of the rubber bits to loosen it up a bit more in slightly longer term. Also decided to knock out a new timing map to bring most of the advance in between 4000 and 5000 rpm, the boxed section is the only bit that really matters here. I can load this fairly easily on the night to see if it helps: Battery location will be the next in order of priority. I have put an enquiry in with the Aussie Caltrac distributor to see if they can supply some before looking further afield as they are not really that expensive in the scheme of things. |
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I've finally given up drinking for good...........now I only drink for evil.
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5799 |
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And the outcome was pretty much no improvement. Did manage to get one run where it hooked up, ran a 1.76 second 60' and 12.04 second 1/4 mile, I think mostly from roasting the tires a bit more than usual in the burnout. Here is the data log of that run, mostly to show that timing map worked as intended for anybody who is interested: This one below, I tried to ease it off the line gently and it lit up the tires almost immediately: |
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I've finally given up drinking for good...........now I only drink for evil.
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5799 |
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Back to more mundane stuff, started work on the battery re-location, a mate at work is going to zip it up for me:
Off the shelf is just too expensive down here in Australia, would be $150 for the plastic Moroso box and $260 for the Taylor aluminum one. I'm putting a rough plan together to build some front end components and will probably look at Caltracs for the rear. Also noticed the the rear sits maybe 1/2" lower on the drivers side, so I'm going to have to look into that a bit more.
Edited by WesternRed - Oct/23/2020 at 5:55pm |
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I've finally given up drinking for good...........now I only drink for evil.
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5799 |
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Well, what difference a week makes, track was much better last night, no tractions issues whatsoever. Put my original timing map back in and actually ran a PB 60' time of 1.679, mostly 1/8th mile runs, we have a heads up radial thing that I'm running in, but did a couple or 1/4 mile runs in as well with a best of 11.84, which is about a tenth off a PB. Running 7.5-7.6 in the 1/8th.
I'd say the most if not all of the improvement was track related, but a few things I did were:
Roasting the tires extra hard in the burnouts, so maybe I've finally worn the winter crust off, my new benchmark for a good burnout is if the cabin is full of smoke afterwards. Sometimes it can be a tricky car to hold in a big burnout, but I'm getting better at it, having a rev limiter now it a bit of extra piece of mind. Did cut half a coil off the front springs last weekend, which I can't see actually doing much in the scheme of things other than lowering the front of the car a bit, so it is a slightly more aerodynamic brick. Took the shock spacers back out too. Battery relocation didn't get completed, so something to look forward to for next time. |
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I've finally given up drinking for good...........now I only drink for evil.
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