My 535is Turbo Buildup Thread! - update 11/26//09

[mooseheadm5]

cvillebimmer was getting spark blowout at something like 10psi, but he had other tuning issues, too.

[Brad D.]

Blowout isn't a biggie until you get up and over 1 bar. Might as well try for at least .030" at 12 psi.

It is at 0.030". I checked my records and that is what it's set at. Not sure why I was thinking 0.028".We shall see how it goes.

[turbodan]

cvillebimmer was getting spark blowout at something like 10psi, but he had other tuning issues, too.

If you're running a stock gap I guess thats possible. Could be a lot of other things too.

[cvillebimmer]

cvillebimmer was getting spark blowout at something like 10psi, but he had other tuning issues, too.

If you're running a stock gap I guess thats possible. Could be a lot of other things too.

I was blowing out spark at 9psi with a stock coil. I put in an MSD and no more blowout.

Soon after the switch to MSD, I discovered that I was one tooth retarded in my cam timing. I'm not well versed enough to provide an intelligent reason, but my hunch is that with proper cam timing and a stock coil I wouldn't have had blowout with the stock coil.

[turbodan]

I dont remember the gap I was using at the time, but I was running over 20 psi with the stock coil back in '07. I want to say .025" but I dont think that would have been possible. I expected to be able to increase the plug gap with the MSD CDI, but I was disappointed to find I could go no larger than I was already with the stock components.

I came to the conclusion that the MSD may be able to produce more spark energy, but the stock ignition components weren't able to handle the higher voltage and would arc if you started to really push it. I'm still running the MSD because it takes the load off of the coil driver in MS, but I dont think I'd bother with it if I were to do it over again.

Blowout at 9 psi is pretty bad. I dont even think I had to gap down the plugs at that boost level. Something definitely wasn't right there.

[bornagain]

i know this is kinda old but i was reading up...

Anyway my little story for over a month i was running bkr6e-11's with no blow out at 7.5 psi and gm wasted coil setup, and no blow out. I was running this til i realized i didnt grab -8's i had grabbed 11's and that is when i changed them after i realized that the -11 meant .040 gap not the .032 gap i thought i had grabbed. I almost want to put them back as the car was running stronger with the bigger gap. I just feared as they wore they would slowly degrade and then i would get spark blow out. or run too hot.

[slow5]

your car looks awsome, its comin out good... im turboing mine and i was lookin for advice on fuel management

[Brad D.]

your car looks awsome, its comin out good... im turboing mine and i was lookin for advice on fuel management

Thanks. If you haven't already I would read through the turbo FAQ and the Megasquirt FAQ. If you don't find answers to your specific questions, feel free to ask for clarification.

[slow5]

also i was wondering how you ran the iacv, and i really like your collector piece yo made and was wondering if you would be interested in makin me one obviously if i paid you haha i just think yours came out awsome and i like the position that it puts the turbo....

[e30-m30_kid89]

Sorry to bump this back up but I was wondering if you were still using the 42lb injectors @ 12-13psi and what does your duty cycle look like. I have a chance to get some 42lbers at a steal and I have a 13psi tial spring collecting dust on my shelf..

[bornagain]

do the math, we know your capable. haha i believe he is still using the 42lb'ers and running 8 - 10 psi. Still hasnt done his clutch last i heard.

Not that this is definitive or really helping but looking back on a previous data log the most i hit was 58% with 62lb'ers but with a 2.5 bar reg(makes them closer to 58lb'ers) and 10lbs of boost.

[e30-m30_kid89]

do the math, we know your capable. haha i believe he is still using the 42lb'ers and running 8 - 10 psi. Still hasnt done his clutch last i heard.

Not that this is definitive or really helping but looking back on a previous data log the most i hit was 58% with 62lb'ers but with a 2.5 bar reg(makes them closer to 58lb'ers) and 10lbs of boost.

Nice, where did you get your injectors from? I'm tempted to just get a set of 55-63lb injectors from racetronix and be done with it, plus new parts are always a plus!

[bornagain]

i got them through my friends shop and they are 62lb/hr high imp, and i think i paid about 60$ each but that was with a good deal.... and im in canada with you, so it was nice not to have to deal with shipping and duties and all that fun jazz. If you would like i can find out how much for a set and shipping and send some to you. Ohh and they are accel which are a seimens injector and are direct plug and play.

[Brad D.]

That is correct. My lazy butt (more like way too busy) still hasn't done the clutch yet but have been daily driving the car at 12 psi. I am almost at 80%DC on the 42lbers at 6400rpm. I am totally comfortable running them to over 90% which means I have a bit of headroom left in them. I could also raise the fuel pressure to gain a bit more flow. For now though they are supplying enough fuel to keep the party fun.

[Scottinva]

Vidoes or it didn't happen!

[turbodan]

do the math, we know your capable. haha i believe he is still using the 42lb'ers and running 8 - 10 psi. Still hasnt done his clutch last i heard.

Not that this is definitive or really helping but looking back on a previous data log the most i hit was 58% with 62lb'ers but with a 2.5 bar reg(makes them closer to 58lb'ers) and 10lbs of boost.

You're running severely rich on that log. You would do well to lean it out to 12.5:1. The engine would also be easier to tune with smaller injectors. If you weren't drowning it with fuel you'd be using less than half of those 62lb'ers. 42lb'ers would probably be better for you.

It also looks like you've got some enrichments kicking in under boost. Your PW and DC shouldn't have those dips. It'll be a lot smoother under boost if you get that worked out, and it'll be a lot less likely to suddenly detonate for no reason.

This is what you want everything to look like, nice and smooth:

[turbodan]

I could also raise the fuel pressure to gain a bit more flow. For now though they are supplying enough fuel to keep the party fun.

I prefer to run smaller injectors at a higher pressure than larger injectors at reduced pressure.

[Brad D.]

I could also raise the fuel pressure to gain a bit more flow. For now though they are supplying enough fuel to keep the party fun.

I prefer to run smaller injectors at a higher pressure than larger injectors at reduced pressure.

I agree. Higher pressure also yields better atomization as you already know, which is beneficial in several ways, compared to a lower pressure.

[bornagain]

well the injectors were for the big picture which i have not gotten to just yet but am getting there. As for the enrichments, i was having alot of problems with noise in the wiring, that is why i have a brand new 12' foot diyautotune wiring harness with all new connectors. I have a few other plans, including new fuel pump and new regulator running atleast a 3 bar reg. And it is just richening up at the high end which i knew about but couldnt change as my friend had borrowed my tuning cable and i dont run the car that hard very often.

[Scottinva]

Proper grounding is such a major issue, i've especially encountered this with the Innovate lc-1 on multiple vehicles. Where the gauge and megasquirt would read differently due to ground issues.

[turbodan]

well the injectors were for the big picture which i have not gotten to just yet but am getting there. As for the enrichments, i was having alot of problems with noise in the wiring, that is why i have a brand new 12' foot diyautotune wiring harness with all new connectors. I have a few other plans, including new fuel pump and new regulator running atleast a 3 bar reg. And it is just richening up at the high end which i knew about but couldnt change as my friend had borrowed my tuning cable and i dont run the car that hard very often.

You would most likely be better off with the stock harness unless its beyond repair. What you're attributing to noise is more likely be due to improper settings in Megatune or bad grounds. The stock loom is very well shielded where needed. I do just fine with the stock wiring.

Notice how it seems to be dropping a fixed percentage of your PW? That says "its in your settings". I dont see any significant noise in the RPM, MAP or coolant/air temp readings.

[WildKarrde]

Just got done reading the thread, cool project!

[Brad D.]

Wow, I haven't seen this thread in a while. A quick update which isn't very exciting - the car is running well at 12psi and has been since this thread was updated. It's crazy to think that the last post in this thread was 2010. Time flies when you are having fun.

[thrty8street]

What are the lengths of the oil feed and oil return lines? ( I am also doing a top mount build)

[Brad D.]

What are the lengths of the oil feed and oil return lines? ( I am also doing a top mount build)

I want to say my feed line is 36" +/- a couple of inches. My return line has a flexible teflon lines stainless line that is about 8" long with a couple of inches of stainless tubing connected by Swagelok fittings. Hope that helps.

[Coldswede]

Wow, I haven't seen this thread in a while. A quick update which isn't very exciting - the car is running well at 12psi and has been since this thread was updated. It's crazy to think that the last post in this thread was 2010. Time flies when you are having fun.

Brad did you ever put that new clutch in? If so we need a report on how you like it .

[Brad D.]

Wow, I haven't seen this thread in a while. A quick update which isn't very exciting - the car is running well at 12psi and has been since this thread was updated. It's crazy to think that the last post in this thread was 2010. Time flies when you are having fun.

Brad did you ever put that new clutch in? If so we need a report on how you like it .

I did finally put the clutch in last summer. It has been great. Pedal feel is basically like stock and engagement isn't touchy at all. All in all I would highly recommend that clutch for anyone wanting great driveability with good holding power.

[dakal]

a great build. lots of info for my future build.

[GrayGohst]

Good read.

[daniels635turbo]

What no video!!!