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Some tuning issues on the ol sds em3e


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So i decided tonight that i was fedup of being inside for a full week because of my surgery in my chest last week, so i took the good ol lady out for a spin. Been a while since i pushed her hard but tonight was a good night to get my frustrations out! That is until i ripped it hard out of the toll booth and it fell on its face at full boost in first gear. Nothing was out of the ordinary so i decided to give it a pull from 4000 rpm in 4th and as soon as i hit full boost (15psi) it had the hicup and i let off, seems to do it in all the geArs except for 5th. Could it be that my sparks blowing out? The car pulls really well otherwise, i have a hard time keeping it straight with the colder temps outside. My timing retard is really conservative (id post the numbers but its too dark to see the damn screen lol. under full boost afr is showin 11.4 and egt is in the high 1200s. Im starting to think its not a tuning issue and it has to do with the spark blowin out. Plugs are indexed and gapped to .032. Unfourtunatley i cant pull the plugs at the moment since i can barely move my left side so im striking up a little convo on here to see what everyone thinks.
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.032 gap and indexed... he's the first person I've ever heard of on here indexing plugs. !

 

usually unheard of ...

 

Depending on how long you've run these plugs they may have opened up a bit. If nothing else has changed since you last run her. What else could it be???

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.032 gap and indexed... he's the first person I've ever heard of on here indexing plugs. !

 

usually unheard of ...

 

Depending on how long you've run these plugs they may have opened up a bit. If nothing else has changed since you last run her. What else could it be???

 

Haha i gues you could say im kinda old skool, i try to do things the correct way. Indexing your plugs takes a few extra minutes and it eliminates the possibility of a problem at high boost levels. Car is tuned for 21psi but i stay away from that on the street, the roads are too messed up around here and the car is stupid fast at that level. I forgot to add that i am running bpr8es plugs. I want to try and run 9s but im scared they wont clean at idle. It takes a while for the egts to reach the cleaning temp. Reason for that is so i can see if i could run less retard without getting spark knock. Currently im running like 24 degrees retard at 21 psi and im running 94octane! If i could turn back time i would of stuck to the 7:1 pistons but that was years ago.

 

You do have a good point with the gap opening with the heat, i will definitley look into that, like i said still not in good enough shape to be doin things under the hood:( hopefully the snow dont start comin down so i could solve this before the winter!

Its funny back in the tbi days and a log manifold with the hx35 and the whole electronics shabang goin on, id be running 1600's in the egt department And close to 13s afr at 20psi with bpr7es' with no spark blowout. I may have been running a tighter gap tho, sumthin like .028 iirc. But then again, airflow was no where near the same as mpi.

 

 

 

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Where are you pulling EGT from?

 

Id close up the plugs. When I ran 8's they liked mid .02X's anytime I was over 20psi.

 

Are the ground straps asking for a colder plug? I ran BPR8es plugs on straight 93 pump gas, 402whp/405wtq @ 20psi, 20deg adv, back in 2010 or 2011 on 8.0:1's. No ignition breakup with .025 gap.

 

When you say 24 deg retard, it means nothing without a stated base timing number as well..... ;)

 

why would you want 7.0? I love 8.6.

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Pulling it after the turbo for now, cant swap it in to the collector at the moment. Dont like to keep it there just incase it blows apart.

Havent been able to check the plugs recently but the the last time i checked the straps looked normal. Base timing is set to 35 degrees 3000 rpm n up iirc. Ill definitley close up the gap when im better. At 20 psi i am at about 12 degrees advance. I have to pull alot of timing to get no spark knock. Kind of makes me feel something is up with the 94 octane up here... Mind you its expensive as hell!

 

If i had the 7:1s instead of the 8s im pretty sure id see alot less problems, the raised compression on these cars seem to make them abit more prone to detonation in the higher boost area. I dont think i could run my car more than 24 psi on pump gas.

 

Where are you pulling EGT from?

 

Id close up the plugs. When I ran 8's they liked mid .02X's anytime I was over 20psi.

 

Are the ground straps asking for a colder plug? I ran BPR8es plugs on straight 93 pump gas, 402whp/405wtq @ 20psi, 20deg adv, back in 2010 or 2011 on 8.0:1's. No ignition breakup with .025 gap.

 

When you say 24 deg retard, it means nothing without a stated base timing number as well..... ;)

 

why would you want 7.0? I love 8.6.

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You guys must be gettin better gas down there than me. 94 is the best we have and its from petro canada (canada) second best is shell nitro + whatever its called but i believe its only 91 aswell. Im gunna try the shell one and see if the car acts differently. I have a feeling the octane ratings are way off Round here. Everytime i go accross the border into the us to fill my tank at sunoco, the gas lasts longer. Mind you its 50% cheaper.

 

What are you tunin with?

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No, that was strictly pump gas. That was before I went to my meth addiction.

 

why were so far apart? Well I live in TX and you live as a toy makin elf for ol St Nick. Also you have SDS............. Isnt that a disease? Starion Death Syndrome? Or.....Im me and you are you.....an elf with magic reindeer to afraid to go click click click......lol

 

No tellin. Lots of causes. How are you monitoring knock? How do you know its knocking? Have you been on a dyno? Not for a shootout, but invest the time and money to really evaluate things. Strap it down at 10am and dont come back off til something gives or 1am. Leave and do it again.

 

The day of those numbers, I made like 15 pulls. Everything worked out. Other times, Ive been on rollers making 20, 30 pulls because things seemed off to me. Just because mine ran more timing doesnt mean yours needs it. we have different engines.

 

Do you have a timing map?

 

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No, that was strictly pump gas. That was before I went to my meth addiction.

 

why were so far apart? Well I live in TX and you live as a toy makin elf for ol St Nick. Also you have SDS............. Isnt that a disease? Starion Death Syndrome? Or.....Im me and you are you.....an elf with magic reindeer to afraid to go click click click......lol

 

No tellin. Lots of causes. How are you monitoring knock? How do you know its knocking? Have you been on a dyno? Not for a shootout, but invest the time and money to really evaluate things. Strap it down at 10am and dont come back off til something gives or 1am. Leave and do it again.

 

The day of those numbers, I made like 15 pulls. Everything worked out. Other times, Ive been on rollers making 20, 30 pulls because things seemed off to me. Just because mine ran more timing doesnt mean yours needs it. we have different engines.

 

Do you have a timing map?

 

Lol! What you dissin Canada?! If your referring to its effin cold over here 8 months of the year your right! It sucks! Unfortunatnley its not easy to move to the us:( i would really love to but both my gf and i would have to get a job where they are willing to sponsor us.

I worked in waco, texas for a couple of weeks at the nsf test center doin some repairs on a filtration system we were testing to get approved. (Really not a place you want to work at. It was basically waco's sewage facility...) none the less i did enjoy having cold beers at the texas roadhouse every night! Haha

Ive yet to get any dyno time on mpi. Ive been putting it off forever. I can have access to one whenever i wish for as long as i want but i can never find the time.

 

I monitor knock through the sds with a factory knock sensor but i dont really use it. My car is quite quiet so im able to detect the knock with my big ears. Loll no seriously tho you hear it. Ive been workin on engines for a long time, its the second car that is computer controlled tho. I get what you mean tho, car drives differently every day. Not by much but enough to throw things off abit. Weather changes alot here. 1 day its 15 degrees the next day its 3 degrees, then the following week its 20 degrees. I see my self always playing with the iat values to get the car to run consistantly in all the temps. I find the sds standard values are not really all that perfected. Maybe my intercooler is not efficient enough to keep the air temps in a good margin.

 

Its true what you say tho, i do need to do alot of dyno time to get er right!

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