Constant throttle stumble.

[Einspritz]

11 hours ago, irdave said:

The pump is a 5 series, 6 cylinder pump, so here's to hoping it's big enough! 

Don't hope, make sure!

 

Hate to say it, but if it is the common replacement for a Tii then in my view, it is insufficient in pressure and volume, for even a 2 liter; though the S14 requires a bit lower pressure. IIRC ~85 lbs.? of course you will only note that it is insufficient at elevated RPM/loads.

 

You will need at least a 12AWG wire and 10AWG would be sufficient overkill to eliminate the suspectability that the pump isn't receiving enough voltage and current to provide whatever specification it is supposed to provide.

 

Why not use the pressure pump specified for the S14?

 

Of course to be thorough, also check your FPR as well, by doing the tests with a vacuum hose and pressure gauge.......

[Dudeland]

Another thing to check is to make sure the cam sensor is working properly.  From what I read it needs to be indexed to  the crank. I read is every time the cam sensor triggers, it then tells the ECU to count the revolutions on the crank to then fire the injectors accordingly.  If it is out of phase, it would fire the injector when the valve is closed. 

 

I found this out when researching how to have sequential injection in the M10.

 

Regards

 

[Dudeland]

P.S yes I need a bit of engine porn...

 

[AustrianVespaGuy]

5 hours ago, Dudeland said:

Another thing to check is to make sure the cam sensor is working properly.  From what I read it needs to be indexed to  the crank. I read is every time the cam sensor triggers, it then tells the ECU to count the revolutions on the crank to then fire the injectors accordingly.  If it is out of phase, it would fire the injector when the valve is closed.

This. . . doesn't actually matter that much.  Ideal phasing for sequential injection allows you to run a little leaner at cruise since you're not 'leaving much fuel behind' in the track or on the back of the valve, but that's about it.  Batch fired engines run just fine, and as soon as you add some throttle, the time the injector is open becomes longer than the intake valve is open anyway.  At this point it's all the same game of loading up intake tract with the right amount of fuel, and then waiting for the valve to open up and suck it all in.

Point being spark timing is critical while spark amount (dwell) isn't so much, but for fuel it's the opposite and amount is WAY more important than the timing!

[irdave]

20 hours ago, Dudeland said:

P.S yes I need a bit of engine porn...

 

Need to re crinkle the valve cover. There's a lot of things I told the car I'd do if it ran right. It's running right, I've got some stuff to do!

[irdave]

Strut tops moved back to have the proper 10 degrees of castor. Engine is further back and lower than typical s14 swap, using E30 subframe...

 

Stock s14 air oil separator typically runs into the airbox. I had put a little filter on the end of the hose and capped everything else off. Made a huge oily mess all over the side of the engine. So I ran a hose from there around the side of the engine bay, used the power steering reservoir because I had it laying around. Works perfect now. My car has been mad at me for a while.

 

Coil on plug really is a tidy solution.

Edited October 8, 2021 by irdave

[irdave]

Some follow up thoughts on tuning...

 

I found some different numbers for flow for the e30m3 injectors, some places listed at 240ish, some 260ish.  Which is possibly based on fuel pressure.  But realizing that in my situation, with a bunch of used stuff, that number is a tuning tool.  My stock injectors always felt like they were putting in too much fuel for any given situation.  So I bumped up to 260, then to 255, in the software, and it feels better than it ever has- not to say everyone with this injector should use 255, but just to say that it adjustable. 

 

I understand how to determine dead times empirically, but if anyone has Bosch data for the 0 280 150 201 injector, I'd love the numbers- just to see how far off I am.

 

Thanks again.

[ray_]

Maybe look this direction....

 

https://www.fiveomotorsport.com/1680cc-bosch-ngi2-0280158827/#:~:text=This is a high resistance,resistors or a resistor box.&text=Dead Time (Latency)%3A,each flow-matched set).

[irdave]

7 hours ago, ray_ said:

Maybe look this direction....

 

https://www.fiveomotorsport.com/1680cc-bosch-ngi2-0280158827/#:~:text=This is a high resistance,resistors or a resistor box.&text=Dead Time (Latency)%3A,each flow-matched set).

 

Yeah Ray, totally.  I found those guys, and maybe even RC- they have a set at 310 or so.  I was also just thinking about the 944? pressure regulator to bump the pressure a touch...  Those above list a time of 0.55 at 14v, which is the relevant number.  But they don't do that for the ones that are like the s14 injectors...  https://www.fiveomotorsport.com/makes/buick/fiveomotorsport-255cc-24lbs-porsche-bmw-original-equipment/

 

My thought is that I need to buy another set, either stock-ish or just bigger, that are fresh, then I can get mine cleaned- then I have a spare set that's known good.  Kinda' freaks me out not having a spare of something...

[ray_]

Look here, too...

 

https://forum.s14power.com/index.php?threads/s14-2-7-norwegian-edition.7710/live&page=5#post-100383

[irdave]

1 hour ago, ray_ said:

Look here, too...

 

https://forum.s14power.com/index.php?threads/s14-2-7-norwegian-edition.7710/live&page=5#post-100383

 

Yeah Ray, that's getting it.  John's forum is a bit more tech saavy- I need to remember that.  Thanks.

[jimk]

1 hour ago, ray_ said:

Look here, too...

 

https://forum.s14power.com/index.php?threads/s14-2-7-norwegian-edition.7710/live&page=5#post-100383

I"d sign on there but I don't know the trivia. 

[ray_]

2 hours ago, jimk said:

I"d sign on there but I don't know the trivia. 

You can use my credentials

[irdave]

2 hours ago, ray_ said:

You can use my credentials

 

Could you imagine showing up somewhere and saying,"Ray said it's ok that I'm here."  Maybe ok getting in line for ice cream, but beyond that?