project Z24 SS *omg an update?*

isaachayes · Posted: Sun Jul 13, 2008 9:18 pm Post subject:

Scott's giving up burning chips? Grab a FIV.

scott0999 · Posted: Thu Jul 24, 2008 12:13 am Post subject:

ok so I got some speed bleeders and a -6AN quick disconnect for the fuel feed line

I plan on starting on the headers this weekend and hopefully make some decent progress

88ragtop · Posted: Thu Jul 24, 2008 5:03 pm Post subject:

fallenz24 · Posted: Wed Aug 13, 2008 11:59 pm Post subject:

Any updates?

scott0999 · Posted: Thu Aug 14, 2008 7:07 am Post subject:

nope havent felt like working on it lately

autotech1117 · Posted: Tue Aug 19, 2008 5:08 pm Post subject:

hey scott, a little late in the conversation of what happened to your engine, but my input on that is the #4 piston being as clean as it is has to be a head gasket problem. coolant in the combustion chamber during ignition steam cleans the pistons and the amount on all the others looks normal. as for the valve if you are still running the 3400 fuel pressure regulator check it for leaking out vacuum port as thr hose runs to the map sensor and into the upper plenum right next to....... you guessed it #4 intake runner. when i rubuilt my sisters montana 3400 we found a bad/melted intake valve and didn't catch it then six months later stared having an extended crank and thats when we found it. i would just recommend checking it as to avoid problems in the future. hope this helps some

scott0999 · Posted: Tue Aug 19, 2008 6:15 pm Post subject:

the HGs were fine, and the burning valves was because of basically no backpressure in the exhaust

isaachayes · Posted: Wed Aug 20, 2008 7:13 pm Post subject:

No back pressure? Uhm, you had a turbo on there! LOL Unless you were driving N/A with no manifolds!! lol.. If they were burning then it's too lean and the EGT are too high.

scott0999 · Posted: Wed Aug 20, 2008 8:01 pm Post subject:

fallenz24 · Posted: Wed Aug 20, 2008 11:20 pm Post subject:

scott0999 · Posted: Thu Aug 21, 2008 7:14 am Post subject:

well whatever I have ls6 springs, lapped the valves, and a wbo2..

phenolic · Posted: Thu Aug 21, 2008 8:26 am Post subject:

Yea I would def say lean condition or valve train issues.

I have seen a situation arise when valves were burnt and the engine had the following:
5 angle valve job
machine fit valve to head seat
Proper springs with proper cam/lifter combination
Slightly rich tune (for error reasons)

Just about all the exhaust valves burnt. Later found out the stems on all the exhaust valves were SLIGHTLY bent holding them open just a tad.

.02

scott0999 · Posted: Fri Oct 03, 2008 6:37 pm Post subject:

figured I'd give an update

back to the valve thing.. it could of been from using the stupid flat shims. I have the LS1 shims in there now to keep the springs centered. there was some bent valves.

anyways I got a megasquirt to broaden my tuning horizons

I got the build it yourself kit. with many hours of soldering and lots of help from 91z24 I got it running

its nice how you can disable the o2 sensor at idle. these cars actually like 12.5 AFR at idle which is basically impossible with the stock ECM unless you run open loop. it also supports WBO2 which im taking advantage of. and no thats not just WBO2 logging, full WBO2 support

im still using the stock ECM for all functions except fuel and spark (VSS, A/C ect)

I also made an effort to fix my vacuum line setup a bit. I really like how the plenum-> FPR turned out

the MS has an onboard 2.5 MAP sensor, so I did a stock MAP delete too (check the pics lol)

from this:

to this:

harness adapter:

finished product:

new plenum->FPR vac line

wheres that map sensor again? lol

my plans next are to get a LSD and then the new turbo setup will begin

enjoy.

isaachayes · Posted: Fri Oct 03, 2008 7:39 pm Post subject:

Yeah just copper shims and no seats would allow things to get ugly I would think, and if the valves were bent then there you go that will burn em up.

Why did you go MS? What's the main reason?

I could assemble a MS myself easy, and probably if I had a spare ECM, and body harness make it to where it's a plug and play into the car, that you could remove and reconnect stock ECM if needed at any time. (of course I'd run it piggy back) but I'd need a base tune to get me going and some how get a wideband installed (maybe in stock location until it's dialed in and tuned for good?) since it's my DD. It would suck tuning for a few hours, then re-connecting the stock ECM back up for next day at work LOL. I have provisions to run dual sensors on the motor for both ECMs already (head has temp sender, and 3wire CTS, plenty of vacuum ports for another MAP, etc). That will be a project after exhaust is done probably. And the last "bolt on" to make this car faster with the stock engine.

Does MS1 do knock? If not I could use the piggy backed stock ECM and read that to see if I get any, but it wouldn't retard timing though.

My 3500 plenum vacuum ports consist of:
Stock port my Alternator -> (capped)
Evap port -> Transmission modulator/Vacuum ball
Throttle body -> FPR
Throttle body -> (capped)

I have enough for a vacuum gauge (not installed yet) and a 2nd MAP with no T's

I would leave the stock MAP in my case since the ECM needs to read load to control the automatic trans. (same for CTS as TC won't lock if reads cold)

LOL @ the FPR line. That's just funny.

But is cool and works! For the MAP you should run it UNDER the coil pack bracket so it looks better. Or run the line off the port by the alternator through the passenger side firewall as that's where the ECM is anyways.

So was it easy to mod the MS1 for spark control? Do you have full control or just something basic? The MS1 looks way easier to build than a MS2 and it's cheaper.

I wonder if there is any 3100/3400 base tunes out there for MS? I guess one could always view the 3x00 fuel and spark tables from DHP or whatever if someone had access to that and then plug in the same values into MS. In my case I'd start with a LG8 large port 3100 since that is what mine almost is aside from the 65mm TB & 3500 top hat it wears.

Looking good, bout time you had some progress! Need to get that thing boosting again soon!

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