Several issues since F28 install, some seam unrelated

kinkyllama · Post by **kinkyllama** » Sun Aug 19, 2007 8:00 am

jidasas wrote:Oh...so the rubber seals the crack and no more spark...er leak. I didn't even think that you might be able to seal the box back up.

Jimmy

No no, I just got it so the spark isn't hitting anything. It's still cracked, so hopfully thats the cause of bad performance.

My speedo seams to be more much much better now that I blocked the spark from grounding, but not perfect. It bounced around 2-4mph for a few mins out of about 35min of driving.

Post by **PrecisionBoost** » Mon Aug 20, 2007 4:56 am

Ignition coils (especially damaged ones) can cause crazy amounts of interference.... which may cause any number of issues with the ECU.

I wouldn't be surprized if the vehicle speed sensor wiring is getting some noise (interference) from the damaged coilpack.

Other sensors that are "pulse based" such as the crankshaft and camshaft sensors may also be getting "noise" induced into them.

Some of the circuits are shielded.... so it won't affect the shielded ones... but I can't remember off hand which are simply twisted pair and which ones are shielded.

Hmmmm... for some reason I think the speed sensor was a shielded cable..... which means it's definitly sensitive to electrical noise (which is why they shield it in the first place)

The only problem is that the shielding only goes so far..... up near the actual sensor itself it won't be shielded and it is possible to get EM field interference.

With all the luck you've had... I sure hope that a new coil pack will get you fixed up and running good again.

Chris

kinkyllama · Post by **kinkyllama** » Tue Aug 21, 2007 4:22 am

PrecisionBoost wrote:Ignition coils (especially damaged ones) can cause crazy amounts of interference.... which may cause any number of issues with the ECU.

I wouldn't be surprized if the vehicle speed sensor wiring is getting some noise (interference) from the damaged coilpack.

Other sensors that are "pulse based" such as the crankshaft and camshaft sensors may also be getting "noise" induced into them.

Some of the circuits are shielded.... so it won't affect the shielded ones... but I can't remember off hand which are simply twisted pair and which ones are shielded.

Hmmmm... for some reason I think the speed sensor was a shielded cable..... which means it's definitly sensitive to electrical noise (which is why they shield it in the first place)

The only problem is that the shielding only goes so far..... up near the actual sensor itself it won't be shielded and it is possible to get EM field interference.

With all the luck you've had... I sure hope that a new coil pack will get you fixed up and running good again.

Chris

Cool, that's encouraging to hear!

Yeah, we'll find out Wensdayisshh when the new one should come in.

oh and I only got 155miles on a 14 gallon tank!!

Post by **PrecisionBoost** » Wed Aug 22, 2007 12:42 am

I think Tom has you beat on the "poor fuel mileage" challenge..... last night he found out his wideband isn't throwing out a signal so the ECU is dumping massive amounts of fuel into the engine.

I would bet he's almost getting gallons per mile

He said he had to drop the fuel pressure to a miniscule 5psi just so that it would run !!!! (he needed the engine running to see if the voltage coming off the Innovative wideband was moving around...which it wasn't )

Even before the wideband sensor failure he was running super rich ( 8:1 A/F ) most of the time.... since he wanted to be carefull until he managed to get the car tuned on the dyno.

We tried some street tuning but his Greddy E01 changes the digital display so quickly that it's really hard to see the A/F.... it needs to be logged on a dyno chart to get a really good idea as to where fuel needs to be trimmed or added.

I also noticed that the E01 has a bit of a delay at times.... kind of bugs me.... I'm glad I bought an analog A/F gauge

The only time it gets into a "regular range" of 12:1 A/F is under WOT with 7psi of boost.

But the good news is that the car is quick.... even in it's untuned state and him letting off at 7psi of boost and 4000 RPM he managed to keep up with my Mazdaspeed3 pretty well.... I killed him in 1st but after that it was close.

I kind of expected that he might kick my ass once the engine is tuned (since his car weighs about 1000 lbs less than mine

) but my limited slip differencial sure makes a difference..... I will easily have him by a car length or more in first gear before he can hook up.

Of course once he beats me I will be forced to modify my MZR to ensure that he doesn't get too cocky

kinkyllama · Post by **kinkyllama** » Wed Aug 22, 2007 4:23 am

PrecisionBoost wrote:I think Tom has you beat on the "poor fuel mileage" challenge..... last night he found out his wideband isn't throwing out a signal so the ECU is dumping massive amounts of fuel into the engine.

I would bet he's almost getting gallons per mile

He said he had to drop the fuel pressure to a miniscule 5psi just so that it would run !!!! (he needed the engine running to see if the voltage coming off the Innovative wideband was moving around...which it wasn't )

Even before the wideband sensor failure he was running super rich ( 8:1 A/F ) most of the time.... since he wanted to be carefull until he managed to get the car tuned on the dyno.

We tried some street tuning but his Greddy E01 changes the digital display so quickly that it's really hard to see the A/F.... it needs to be logged on a dyno chart to get a really good idea as to where fuel needs to be trimmed or added.

I also noticed that the E01 has a bit of a delay at times.... kind of bugs me.... I'm glad I bought an analog A/F gauge

The only time it gets into a "regular range" of 12:1 A/F is under WOT with 7psi of boost.

But the good news is that the car is quick.... even in it's untuned state and him letting off at 7psi of boost and 4000 RPM he managed to keep up with my Mazdaspeed3 pretty well.... I killed him in 1st but after that it was close.

I kind of expected that he might kick my ass once the engine is tuned (since his car weighs about 1000 lbs less than mine ) but my limited slip differencial sure makes a difference..... I will easily have him by a car length or more in first gear before he can hook up.

Of course once he beats me I will be forced to modify my MZR to ensure that he doesn't get too cocky

Thankfully on that! Sadly I think I'm still getting better gas milage than with my SUV.

8:1 afr!? jesus!!! What will he likly run once it's tuned?

That's def good to hear it's that quick. Ehh I can't seen Tom being a very cocky person though. Too bad he didn't go with an LSD I know he was considering it.

Post by **PrecisionBoost** » Wed Aug 22, 2007 5:07 am

Well.... Tom and I work together and spend a day here or there hanging out ( usually coffee and apple berry crumble on a busy "place to be" street called whyte avenue )..... so you might say I know him better than anyone else.

He might seem humble on the phone but trust me.... as soon as he beats me he's going to gloat all day long for a week.... ok... make that a month

It's all in good fun.... we like to bug each other.

I think the LSD thing was put to the side due to timing..... he really wants this project to be over so he can enjoy his ride ( I'm sure you know exactly where he's coming from as someone who hasn't driven his car much in the last year)

We are just in the works of me selling him one of my Lanos's and he's selling me his "daily driver Lemans" so I hope to catch up to him over the winter and have a Lemans chassis up and running by spring.

My youngest daughter is now 12 weeks old..... so things are starting to relax around the household.... so I hope to start spending a bit of time on projects again in the next month or two.

Chris

exist3nce · Post by **exist3nce** » Thu Aug 23, 2007 6:33 pm

Hey kinky

I just saw this thread today! Great to hear that its in and driving.

I am curious about the speedo problem. What did your shop do for the speed sensor on the 6 spd? Did they just swap in the one from the D20? Does it fit? Or did the F28 come with its own ? The speed sensor on my D20 died for no apparent reason about 3 months ago, so I wouldn't call those sensors "reliable".

I don't know if you have taken the whole speed sensor assembly apart, but on the D20 theres 2 pieces to it. One is the plastic piece that has an arm with a gear that reaches down into the trans to connect to one of the output gears. The other is an electronic piece that that screws on top of the first piece to measure the RPM and output it as a reading on your speedo. You might want to double check both pieces. Make sure no teeth are missing and that the whole unit isn't loose or anything.

I'll be needing a 6spd soon too

Keep us updated !

kinkyllama · Post by **kinkyllama** » Sat Aug 25, 2007 10:29 pm

Well replaced the MSD peice and it's better, but far from perfect. It's still lacking power big time, and sounds very different at higher rpm. I'm going to try to reset the ECU but I dont expect that to change anything. The speedo doesn't work all the time still either, but I just need the power back to dyno my headers and whatnot.

exist3nce wrote: I am curious about the speedo problem. What did your shop do for the speed sensor on the 6 spd? Did they just swap in the one from the D20? Does it fit? Or did the F28 come with its own ? The speed sensor on my D20 died for no apparent reason about 3 months ago, so I wouldn't call those sensors "reliable".

I have no idea what they did with that part of it. I wasn't very involved with the 6sp swap cuz of all the crap that happened with my house getting robbed

Post by **PrecisionBoost** » Sun Aug 26, 2007 8:25 am

Are you running some type of wideband A/F meter??

I'm trying to remember what you have installed for management.... you have an SMT6 or SMT7 right?

kinkyllama · Post by **kinkyllama** » Sun Aug 26, 2007 7:20 pm

PrecisionBoost wrote:Are you running some type of wideband A/F meter??

I'm trying to remember what you have installed for management.... you have an SMT6 or SMT7 right?

No I do no. But we will probably test the afr and all the guys doing my headers are going to look everything over tuesday.

Yes I do, it def should be messed with. The only thing we did was put on the new fuel pump and 44lbs/hr injectors and tune it to lean them out as much as possible, then a week later I put in leggy injectors cuz it wasn't even drivable.

kinkyllama · Post by **kinkyllama** » Mon Sep 03, 2007 7:43 am

Okay since I replaced the crack coil the cars more responsive, and has a tad bit more power but still not nearly close to what it used to be. The speedo also works perfectly now.

I scanned the CEL and it was just the CAT as I had though. My last tank of gas I got nearly as good gas milage as I used to get...but it's very inconsitant.

ughhh, any other ideas? I'm going to replace the spark plugs tonight but I don't expect that to clear things up, maybe just a tad. What are you supposed to torque the spark plug too anyways?

Also gonna change the oil Tuesday, it's pretty dirty and a bit low. So that might also make a slight difference.