bymderek
Boosting 10 psi
ms2 experiments
Posts: 37
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Post by bymderek on Oct 31, 2018 20:20:29 GMT -5
maybe someone had a similar issue.. long story short: 1979 2.3L draw through turbo, did the swap to EFI with megasquirt 2extra... t04e turbo have 2 sets of injectors used first some 80 pound then downgraded to 33 pounds to see if idle was lets say friendlier. when it was a draw through it would run perfect at 10 degrees intial timming, after the swap I had to bump to 23 to hold idle.
car felt alright did some tuning on afrs and after 1 hard pull the turbo failed. the turbo shaft basically bent on the hotside due to high temp. it looked like a red ballon under the hood. hahaha
total advance timing 27 degrees. 12.5:1 afrs @15 psi 5800 rpms, as far as the log looked when it failed.
you think it could had jumped a tooth on the cam and this making this problems with initial timing and glowing everything on the hotside?
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Post by Stinger on Oct 31, 2018 23:22:25 GMT -5
It's almost certainly that the timing hasn't been set properly. The fact that you had to advance it so far to get it to idle is a dead giveaway, as is the glowing turbo and such. That's ALWAYS either timing being way off or AFR being way off.
How did you verify timing commanded by the ECU matches what's happening at the engine?
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bymderek
Boosting 10 psi
ms2 experiments
Posts: 37
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Post by bymderek on Nov 2, 2018 20:09:21 GMT -5
It's almost certainly that the timing hasn't been set properly. The fact that you had to advance it so far to get it to idle is a dead giveaway, as is the glowing turbo and such. That's ALWAYS either timing being way off or AFR being way off. How did you verify timing commanded by the ECU matches what's happening at the engine? I believe so, it makes a lot of sense right? well the distributor is locked out. setting on the megasquirt the trigger wizard matching it with timing lamp. probably it skipped a tooth or could be a tooth or 2 off since I changed the cam with a ranger roller cam and used the original cam pulley. might have to just do the flat bar and re mark the pulley to the aux pulley center. as for AFR's I use a aem wideband and it reads the same on mega as in the wideband gage. have used the same wideband to check other projects and reads ok. thank you for your help I always appreciate it!
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Post by Stinger on Nov 2, 2018 22:55:19 GMT -5
You need to leave the spout installed, change timing to "fixed" and 20 degrees in TunerStudio, then check what it's reading with a timing light. Ideally you turn the distributor rather than use the trigger wizard to make timing match. So you'd put the wizard back to the default value and adjust at the distributor. Once it reads 20 deg with a timing light then lock down the distributor and change back to "use table" in TunerStudio.
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bymderek
Boosting 10 psi
ms2 experiments
Posts: 37
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Post by bymderek on Nov 5, 2018 11:31:45 GMT -5
You need to leave the spout installed, change timing to "fixed" and 20 degrees in TunerStudio, then check what it's reading with a timing light. Ideally you turn the distributor rather than use the trigger wizard to make timing match. So you'd put the wizard back to the default value and adjust at the distributor. Once it reads 20 deg with a timing light then lock down the distributor and change back to "use table" in TunerStudio. that's exactly how I did it. no spout on my setup since its not a PNP. guess Ill simply check the cam position, start from there. still gotta wait for the turbo to get back so it will sit for a while haha thank you!
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Post by Stinger on Nov 5, 2018 13:15:31 GMT -5
You said you used the trigger wizard before which is not exactly the same as turning the distributor. Otherwise you're on the right track to verify cam and ignition timing again.
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bymderek
Boosting 10 psi
ms2 experiments
Posts: 37
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Post by bymderek on Nov 5, 2018 17:03:37 GMT -5
You said you used the trigger wizard before which is not exactly the same as turning the distributor. Otherwise you're on the right track to verify cam and ignition timing again. I was referring as it states on the mega manual.. but I do prefer turning the distributor to match instead of the offset...
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Post by arayaracing on Nov 28, 2018 1:09:49 GMT -5
did make sure that the wideband you're using is a 0~5v? If not, did you change the calibration in the software to compensate? I ran into a similar problem on a customers vehicle that was using an Autometer wideband that was a 0~4v. I only figured it out because I was on a chassis dyno and I had the dynojet's wideband hooked up and the one the PIMPxs was using. After a couple of pulls and logs I noticed the O2 readings did not match. I trusted the dynojet more than what was showing on the tunerstudio. After a quick google search of the voltage I realized that it operated on a different scale. I located the calibration tab (Tools) and change the calibration to match. After that I was in business!
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