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Post by spud on Jan 4, 2022 9:24:01 GMT -8
Ok so for new years we got some freezing weather, i made good use of that by yanking out my noisey 2.87 axle, tearing it down, tearing apart a 2.87 matador axle for the gearset to swap into the javelin axle housing, installing the matador gearset with a timken install kit, reassembling the axle, installing it with new brakes, brake lines and parking brake cables, 85-140 gear oil, and road tested it last night. Nice and quiet. Racing season starts feb 27. Probably swap it out for the 3.15 axle then. Going to assemble a 3.31 axle soon. Still have a mta-1 cam to swap in. Tons of stuff to do in two months. Maybe i can get the 304 down to 14.5s this year?
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Post by Captain Awesome on Jan 4, 2022 11:15:36 GMT -8
Getting into that alum headed Blowpar wedge territory.
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Post by sc397 on Jan 4, 2022 15:37:45 GMT -8
Racing season starts Feb 27. LOL! You are a lucky Dude Spud. On that day most of us Michiganders will be wishing we were any place else. Maybe I should make a trip to Texas!
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Post by spud on Jan 4, 2022 15:53:02 GMT -8
Extreme motorsports park never shuts down, except for bad weather conditions. You can get track time almost any weekend. The TMCCC has its first scheduled race feb 27 there. Its 1/8 mile but i like that. Extreme is a great place any time. We are lucky to have it!
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Post by spud on Jan 12, 2022 16:07:19 GMT -8
Ok so update on 2.87 2.0 rear axle. Pinion seal crapped out bigtime and its puking. Ho hum. Demotivation syndrome. Thats what happens when you clean and paint shit. Might should have just put the 3.15 back in … in hindsight. In other news i got a care package from A Rick Jones care of ARJ enterprises inc containing some steel shim 304 headgaskets. Also a new name for my automotive misadventures…” SPUDINSKI MOTORSPORTS”. Which i think is very cool. Thanks Rick! 😎
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Post by spud on Jun 12, 2022 15:14:15 GMT -8
Well its been awhile and i got off track of this thread. The javelin has moved forward. I bought a a/f ratio control from innovate motorsport. Its a digital control that evaluates a oxygen sensor, and can interface with datalogging devices , fuel injection control and a/f ratio displays. I use it to drive a digital a/f ratio display. I also hooked up a vacuum gauge and have used them to make changes in my fuel delivery and ignition system. I went this direction because i felt like i had exhausted my abilities to tune based on reading spark plugs and the five senses. I felt like there is more power and efficiency to be had, i just was unable to find it with my lack of perception. I previously had a autometer a/f ratio gauge, which was vague and inaccurate, and was not specific, and did not tell the actual a/f ratio. It wasnt much help. The new a/f fatio display is much more helpfull. It led me to this- changing out my old allison ignition to an MSD ignition. I wanted to think the allison worked well. It did way better than points. But it was lacking, particularly at idle for unknown reasons. I went msd this week and it was a dramatic improvement. Yeah, i was delusional. I have msd ignitions on my race car and 401 javelin, but i put them in with new engines so i didnt realize or appreciate the difference msd makes. The msd cleaned up my idle dramatically, and allowed me to lean out the idle considerably with no misfire. The msd worked with changes in the advance curve tuning for better throttle response. The msd has improved the tendancy of rich, noxious idle exhaust gasses. So thats all a move forward. I have begun to make changes in fuel metering, due to the help of the a/f ratio display. It helps to have a defined a/f reading when changing fuel metering. I did not know how bad my old tune was, it was pretty rich. Leaning it out has found more power and mileage, and it is easier not flying blind. Alcohol blended fuels are “ tough to read” on the sparkplugs so carburetor changes are a much clearer proposition with a correct and accurate a/f ratio reading. The a/f ratio display also highlights how random and innacurate fuel metering is with a carburetor. So i sit here impressed by modern electronics. A big win with multiple spark capactive discharge ignition, and a big win with an accurate a/f ratio display. Eeking out more power and better milage and drivability. I went with the very affordable msd “ street fire” control, which is less than half of a 6AL and more compact. It has a built in rev limiter, which is adjustable with internal dials. I also bought the cheap summit billit distributer. Which is an msd billet clone. I put about 150 miles on them this weekend and the distributer gear is still like new and both worked flawlessly. Also in the pipeline are new NGK irridium plugs. And as always i am experimenting with this avs/2 and will likely try a holley 575 street avenger. Still waiting on my modified 304 heads to be finished. Which when installed will likely “ change the tune”. But i’m better equipped to deal with it effectively. You see a project like this is never done.
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Post by landbarge on Jun 12, 2022 16:15:08 GMT -8
Nothing like a good wide band meter.
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Post by spud on Jun 18, 2022 5:47:23 GMT -8
The old 304 got 18.7 mpg average on the last tank,all City driving in rush hour traffic. I think it might top 20 mpg on the open road.
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Post by landbarge on Jun 21, 2022 5:23:34 GMT -8
Think if you need better numbers than that, you need a Toyota. I decided to see how good the metering isn't on this 53 year old AFB. I've got an AEM wideband a/f on its way from Summit
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Post by spud on Jun 21, 2022 8:17:31 GMT -8
I have an innovate motorsports digital gauge. It works well. I had a autometer gauge it , it had three colors. I didnt really know where i was with it, but the innovate reads digits so its readable. I adjusted idle mixture to range around 14 ish. It doesnt start and idle well when cold but works good when warm. It has a tendancy to heat up the coolant when idled extensively however. It might be better a bit richer. I changed the metering rods and jets to about 14-15 at cruise. I get about 12 when in power mode ( below 7 inches of vacuum) and still tinkering with wide open. I think i went too small on the secondary jets cuz wide open ranges abot 13-12.5 ish. The one area i cant do anything with is just off idle, i think it pulls fuel from transistion passages and always runs rich there. It leans out gradually untill your in cruise mode. Cruising at 14-15 is as good as it gets on the hiway. I have a random misfire ar idle still, the msd helped it some maybe, i think i might possibly have some valve seal hiccups causing what i’m hearing. When you have a stock cam idling silky smooth at 21” of vacuum you hear stuff like that i guess. It is more fun to drive around not using as much gas, but its current tune has lost some wide open power. I’m pretty sure the secondary jets will fix that when i change them back. I do have even better torque off idle.
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Post by spud on Jun 21, 2022 8:39:17 GMT -8
Another thing i find interesting is the msd ignition appears to have changed the response of the idle mixture screws. After the msd i readjusted them much more closed. They are currently about a half turn out. Before they were about a turn out, and it does idle better. I think the multiple spark helps combustion at idle. After i installed the msd i recurved it, and i might be a touch conservative with 36 degrees at wide open, but i honestly think i was overdoing it with the last curve. You cant “have it all” with an analog distributer curve. I think i’m gonna leave it alone since its working in cruise and full power conditions. The 304 seems to tolerate too much timing without pinging, but that can fool you into an over agressive ignition curve that loses some power. 32 degrees at idle is too much and gives a rougher idle. I am now idling at 30 successfully. I have 14 initial with 16 vacuum on full manifold vacuum. I get full mechanical advance at around 24-2500, so i’m cruising below 52 degrees total somewhere since i generally an poking along at 2200-2300 rpm. If i’m really flying above 2400, i should have full advance at 52 degrees. It works fine.
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Post by landbarge on Jun 21, 2022 8:44:15 GMT -8
With the MSD, I'd try tossing more gap at the plugs. May help a little in the leaner areas.
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Post by spud on Jun 21, 2022 8:52:48 GMT -8
I havent experimented with that. I have been studying it and most dont feel its a big advantage, and caution against making it harder for the spark to jump the gap, because the msd has so much energy it might jump spark to somewhere else. I run ngk v power plugs, and the v notch in itself opens up a window for a bigger spark “ kernel”. The plugs are not new, but not old. I havent looked at them lately. I bought some new ngk irridium plugs but havent tried them yet. I still plan on changing the heads in the not so distant future.
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Post by landbarge on Jun 21, 2022 9:11:14 GMT -8
Good plug. That's all I've been running for 20+.
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Post by PHAT69AMX on Jun 23, 2022 11:27:17 GMT -8
Spud, at hot idle, how many turns opened from fully closed is the primary Idle SPEED screw?
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