The Project Pad

Well here is your answer for load-based dwell and VEMS. I'd really like for someone to make a new, stable firmware available for us 3B vems guys **hint hint!!!!!**

http://195.159.109.134/vemsuk/forum/ind ... 018.0.html

Thanks jcarrick. Do you guys mean F5DPOR or is it FD5POR? Its listed as the former on Apikol's site.

I believe its F5DPOR, my bad

Hey lox, are you still running in disty mode or did you move over to the coils yet?

Also, this is coming from my MegaSquirt background so I am not sure how useful this information is to you but in MegaTune for VEMS is there a reset count at the bottom? When the car cuts out, does the reset count increment? If so, this can be caused by electrical noise usually caused by coils.

On my last megasquirt build I had this issue and I added a few capacitors to the board in strategic places which ended up correcting the issue. Again, I don't have a VEMS unit yet, however I will be obtaining one very soon so I will be able to help out more on the topic.

Nick

Thanks for the input Nick. I believe it does, but I'm not sure if it records anything like that in logs.

I am almost certain it records resets in the logs.

OK, I'm just not sure where..

it should show ECU run time on the bottom of the graphs, resets as in restarts are marked in the progress bar.

Attachment ( 20594 ) : New Bitmap Image.jpg

Er, OK so I threw some BKR7E's in just for the hell of it to see what they'd do before I spend $17 per plug.

First run I did (and didn't log) was with the BKR7 plugs (gapped to .026) and the same exact settings as the previous logs. Same result. Two misfires. One somewhere in the 5k range, and one shortly thereafter somewhere in the low 6k range.

Next I tried a new map. Only thing changed besides a little fuel tweaking was 4ms of dwell. It was previously 3.5ms.

The car responded well to this. It pulled very cleanly up until about 6700 where it had a hard misfire like the car would do lower in the rev range consistently before. It can be seen in each pull I made for the same log.

The really funky thing is that I got two ECU resets this time. One when cruising low RPM and one in the middle of a pull. You can see the one in the pull in this log (also notice the lean spike right at 6700).

Here you can see the two resets (bottom bar) and the reset from the pull.



and here is the log better scaled (was all effed up because of the resets)

Are you in disty mode or coils? Your dwell time should be as low as
possible without misfire. Have you tried setting the running dwell to something like 2.0 and see what it does? It's possible that you're overheating the ignitor.

On a side note, have you check with mark at efiexpress to see
if he's got any ideas?

Tried new plug wires?

Sam

YGM, just replied to your PM Chris.

Sam is right on, I'm beginning to think you might have some arcing going on between the plug wires and the head. carefully check the ends of the spark wires and look for any burn marks or pin-holes. Arcing like that wreaks havoc with electrical systems.

The wires were new from Marc a few months ago.

The car is not running with the dizzy. Its coils. I know the dwell should be as low as possible, I'm just playing with it at this point to try and diagnose whats going on. I have indeed spoken with Marc. He is the main person I have been dealing with regarding this issue. I like to post it here as well because it leaves room for a second opinion. He is thinking plug wires too FWIW.

Find another set of wires to throw on there, these sound similar to issues I've had before that were wire-related.

Sam

Thanks for the input. I'm going to pull the wires off tomorrow and inspect them. I wont write them off even if I don't find anything visually though. Its just so weird that something so simple can potentially cause such problems.

I was glad to hear they have a lifetime warranty. Thanks Marc! If this is indeed the issue, you two are geniuses.

Eh, I had a shady set of wires I think caused me to blow a motor. Call it learning through experience :wink: .

Sam

I looked at the plug wires today and they were fine. Seems like plugs are at fault again. I was using F6DTC's recommended by Apikol :tard:

The resistored BKR7's still give problems but who knows. I'll be getting some F5whatevers and new plug wires just to be very thorough. Again, thanks to Marc. Amazing service. I'll do it nice and scientific like and do just wires, and then if that doesn't fix anything I'll add the new plugs to the mix or the other way around.

Good luck man. Keep us updated for sure. I want my VEMS naow. lol.

I'm about to order a treadstone intercooler (as I've mentioned here multiple times) because its the only core with the right specs that will fit as far as I know.

Does anyone have a hookup on them?

Can't wait to get new plugs, etc.

loxxrider wrote:Can't wait to get new plugs, etc.

ships out tomorrow morning

BKR7E's for me in every car I own(ed), never had a problem.

Whats the IC all about?

Yeah...me too. They have always worked great at high boost, etc.

Everyone says these cars just dont like anything but bosch plugs

The IC is all about me trying to get the Holset on the car finally. Not sure if you are familiar with my plans, but for now I intend to use the Holset and make 350or so awhp and then maybe throw in some rods and up the boost to make 400-450awhp. This isn't my ultimate goal however.

After this point, lots of expensive goodies are required to hold more power. Tranny will have to be O1E, I'll want a tubular header, new intake manifold, and probably pistons and rods. Turbo choice is something that will get me into the 700whp or so range. Precision 6262, t67, gt4088, borg warner 3 series, etc.

I'm not one for wasting money on redoing things to accommodate my future goals, so I'm doing everything I can to make the ~400whp build easily transfer into a double that.

Thats where the intercooler comes in. In order to achieve my power goals efficiently, the core will have to flow 1200CFM or so and piping has to be 3" in order to keep air speeds inside the piping below mach 0.4. The size of the core has to be substantial when those requirements are taken into account, but vertical flow intercooler cores cool more air per volume so a vertical core is the best choice for the application...especially when you consider that its much easier to do same side in same side out end tanks. The configuration of the intercooler in question is about the most efficient design you can have. End tanks on top and bottom, same side, vertical core, etc.

I did my research in Maximum Boost if you couldn't tell.

Basically its the only IC that fits the bill for what I want to do. I'm doing the same with injectors. They are way overkill for my current status, but they will work just fine and will be perfect for the higher horsepower phase. Exhaust manifold is pretty much the only thing right now that I'm buying which is not included in my ultimate goal...but it kinda has to be that way.

Is that what you wanted to know?

Installed new plugs today. No dice. Car died during a pull and then the next pull resulted in horribleness.

Then tried new wires along with the new plugs. Seems like problem is solved. I wont have the time to test the car out over the next week because I'll be going home for spring break and the car isn't coming with because the tire (to fix my bubbled sidewall) got sent to my billing address instead of my shipping address

Car has stupid boost leaks like usual. I'm not even going to try and track them down this time. This is why I got Hargetts. SO worth the money. I can't wait to get them on.

loxxrider wrote:Yeah...but vertical flow intercooler cores cool more air per volume so a vertical core is the best choice for the application...especially when you consider that its much easier to do same side in same side out end tanks. The configuration of the intercooler in question is about the most efficient design you can have. End tanks on top and bottom, same side, vertical core, etc.

THIS?

I want to squeeze one into my Coupé.

Yes, thats the exact one I'm getting

you might want to look into the smaller version though. This one is good for like 800whp.




You'd want the trv185 I think.



here is the 185





Better yet is an ebay core in that size. I would have done that if ebay offered a core the size and configuration I need.


http://www.siliconeintakes.com/product_ ... 6ad0077845