Electromotive Group Forum Index

Here to promote one of the most sophisticated EMS's known to man!
 
Home   FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups    CalendarCalendar   RegisterRegister   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Welcome
Welcome to Electromotive TEC Group!.

Noob TEC troubles
Goto page Previous  1, 2
 
Post new topic   Reply to topic    Electromotive Group Forum Index -> TECgt
View previous topic :: View next topic  
Author Message
Jon@EMI
EMI


Joined: 26 Feb 2008
Posts: 144
Location: Manassas, VA
PostPosted: Fri Jun 20, 2008 3:16 am    Post subject: Reply with quote
You can run the low impdeance injectors in sequential just fine. Without a cam sync, the injectors may or may not be in phase. This is not usually a big deal. It certainly won't effect power, but it my have an effect on idle quality. When the pahsing is off, the AFRs may read funny and the idle may be a bit rough. I have several dealers that regularly run sequential with no cam sync quite successfully.

How much fuel pressure are you running now? An adjustable FPR may help, but i don't think that's really what you need to do. You should be fine on what you have. I don't think throwing more money at this project is what you need to get things right.

Maybe I just need to be more clear on what it is your having trouble with. You said earlier that you were able to get he engine to rev through the RPM range. It evidently starts well enough that you haven't mentioned it yet. Is the idle rough? rich? inconsistant? unstable? does it idle or do you need to actively keep it running? Does it stall when you try to drive it(if you have driven it)? How much timing are you running at idle? I can't see the car so I may be missing something obvious. Could you post a datalog of it running showing the problem your try to work out? Maybe also a copy of your program.
_________________
Jon
Project Engineer
Electromotive, Inc
jon at emi.cc
www.distributorless.com
Back to top
SATAN
Newly Aquired


Joined: 14 Mar 2008
Posts: 32
PostPosted: Wed Jul 02, 2008 4:25 am    Post subject: Reply with quote
Crab Spirits wrote:
Can I still go sequential with these low impedance injectors? How does it know which is TDCC and TDCO without the cam sensor? Does it just guess?

I was also thinking about getting an adjustable FPR and try leaning it out that way. Mad Sad


You cant run full sequential without running the 120-4 cam wheel. The ecu has no idea what is what with the crank trigger wheel. EDIT: oops, just read the above post. I'm a dumb ass.

I have been reading everything Jon has been saying, and I can't really suggest anything further than what he has said. He is FAR more knowledgeable at the Electromotive than I am. It is very odd to me that with the radical changes like you are doing to the IOT that you cannot get your car to idle above 11.x:1.

Jon, Crab Spirits and I both run the same engine (VG30ET) in the Nissan Z31. Difference is, he runs the the TECgt and I run the older TEC2 HOWEVER, I run batch fire with 860cc injectors. I can get my car to idle at 14.7 or leaner if I want at 700rpm. I can't remember my TOG and IOT at the moment, but it is somwhere around 7 for TOG and... shit, cant remember IOT. The minimum turn on time is set as low as I can at 1.3ms. Basically what I am saying is that he should not have ANY problems as far as his injectors being to big.
_________________
Back to top
Jon@EMI
EMI


Joined: 26 Feb 2008
Posts: 144
Location: Manassas, VA
PostPosted: Wed Jul 02, 2008 1:45 pm    Post subject: Reply with quote
SATAN-
Go ahead and see if you can get your numbers from your program. That'll give him somewhere to start.

Crab Sprits-
I think once you have a good starting point for TOG and IOT, you're going to have a much easier time of the whole thing.
_________________
Jon
Project Engineer
Electromotive, Inc
jon at emi.cc
www.distributorless.com
Back to top
SATAN
Newly Aquired


Joined: 14 Mar 2008
Posts: 32
PostPosted: Sat Aug 23, 2008 4:20 pm    Post subject: Reply with quote
Jon@EMI wrote:
SATAN-
Go ahead and see if you can get your numbers from your program. That'll give him somewhere to start.

Crab Sprits-
I think once you have a good starting point for TOG and IOT, you're going to have a much easier time of the whole thing.


Thats just it though. Yesterday I was playing with my new setup and I can run anywhere from a 6 TOG to an 8 TOG. I just pull the IOT as much as I need to to get it to sit around 14.7.

I did have problems at first though cause my minimum injector turn on time was set at 1.3ms. I dropped it to 1.1 and it had no problem controlling it at that point. I don't really understand how it can control them at 1.1ms when the minimum is supposed to be like 1.3ms but hey, it worked. The TEC units are not peak and hold are they? I didn't think they were anyways.
_________________
Back to top
Jon@EMI
EMI


Joined: 26 Feb 2008
Posts: 144
Location: Manassas, VA
PostPosted: Mon Aug 25, 2008 2:59 am    Post subject: Reply with quote
The TECII do have peak and hold drivers. In fact, the driver in the TEC2 was carried over to the TEC3. That still doesn't completely explain why you can go all the way to 1.1ms for the minimum on-time.

That is working because the injectors don't jump to just completely off at on-times under the specified minimum. What happens is the fuel flow relative to the dutycycle begins to drop off. In other words at 50% dudtycycle, the injectors are in fact delivering 50% of thier rated flow rate. Or at least really close to it. But at lower than minimum on times, let's use 1% as an example, it may be deliver .7% of the rated flow instead of the expected 1%. This can be accounted for if you're expecting it, but it can start to drop off really quickly. We have a dealer that did big horsepower Supras with 160lbs injectors. He would oftern use this effect to make them idle at very reasonable AFR's.
_________________
Jon
Project Engineer
Electromotive, Inc
jon at emi.cc
www.distributorless.com
Back to top
Crab Spirits
Newly Aquired


Joined: 17 Mar 2008
Posts: 12
PostPosted: Sat Aug 30, 2008 8:59 pm    Post subject: Reply with quote
Just to update, I did the rewire to sequential. I'm getting what I want at idle and response is more crisp as well. Thanks.
Back to top
Jon@EMI
EMI


Joined: 26 Feb 2008
Posts: 144
Location: Manassas, VA
PostPosted: Sun Aug 31, 2008 3:37 pm    Post subject: Reply with quote
Good to hear! Let us know how things finish up.
_________________
Jon
Project Engineer
Electromotive, Inc
jon at emi.cc
www.distributorless.com
Back to top
Display posts from previous:   
Post new topic   Reply to topic    Electromotive Group Forum Index -> TECgt All times are GMT
Goto page Previous  1, 2
Page 2 of 2   

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum