Search found 141 matches

by blundar
Mon Sep 27, 2021 12:49 pm
Forum: Tuning Support: Making it Run
Topic: Auto-tune does not produce good results
Replies: 13
Views: 3653

Re: Auto-tune does not produce good results

If I understand you correctly, Nik, you're asking how much energy is needed to make the crankshaft spin before the engine actually starts doing the work of spinning the transmission? Frictional losses, accessory drive, lots of stuff go into this. I am going to go out on a limb and say "single d...
by blundar
Mon Sep 27, 2021 4:39 am
Forum: Tuning Support: Making it Run
Topic: Slides from a Tuning Class I once taught
Replies: 0
Views: 3327

Slides from a Tuning Class I once taught

I taught this class several times. Most of the folks in attendance knew how to turn wrenches but did not have a lot of prior tuning experience. The class was aimed at the Moates QuarterHorse for EECIV Ford applications, but I spent a day going over things that were general tuning concepts. The secon...
by blundar
Mon Sep 27, 2021 3:31 am
Forum: Tuning Support: Making it Run
Topic: MAF vs Speed Density, why do we prefer which one?
Replies: 21
Views: 5228

Re: MAF vs Speed Density, why do we prefer which one?

If I had to pick a MAF or a MAP sensor, I'd take a MAF any day of the week. MAF is inherently far more accurate for metering airflow in conditions where you can achieve or nearly achieve laminar flow. Choose your MAF wisely, mount it wisely, filter it as little as necessary. You know airflow. No gue...
by blundar
Sat Sep 18, 2021 3:09 am
Forum: Dev: Hardware
Topic: Hellen 125 Honda K
Replies: 3
Views: 1006

Re: Hellen 125 Honda K

Everyone except me seem to think DBC K series are hot shit.

I am more of the DBW persuasion. So I will be tackling the 06-14 pinout(132). If it ends up a parallel effort to a Hellen, cool. If you end up tackling DBC connector/pinout(125), cool.
by blundar
Fri Jul 02, 2021 4:25 am
Forum: You and your build
Topic: '71 240Z w/ '82 280ZX L28 MRE project
Replies: 19
Views: 4124

Re: '71 240Z w/ '82 280ZX L28 MRE project

https://forums.hybridz.org/topic/115112-rb-efi-system-retrofitted-on-a-l28et/ There's a thread about putting a Z32 ECU on the L28ET. I wonder if you might be able to steal a few tricks to use to get a better engine speed sensor set? The nissan CAS are essentially optical hall effect. I'm jealous of ...
by blundar
Wed Jun 30, 2021 6:02 pm
Forum: You and your build
Topic: Rotary engine Rx8 in Florida
Replies: 66
Views: 11080

Re: Rotary engine Rx8

Translating from Andreyish (which is an unusual blend of jumble, english and russian): -You have been told to do certain specific things (use a certain bundle, use the ini retrieved from the rusefi controller to configure TunerStudio, take a screen capture showing sequence of events leading up to pr...
by blundar
Wed May 26, 2021 6:06 am
Forum: You and your build
Topic: 1997 Ford F-150 5.4 E4OD
Replies: 44
Views: 10647

Re: 1997 Ford F-150 5.4 E4OD

Part of the reason half bridges are used for higher speed switching vs. FET+diode is that the non-switched FET can act as an active flyback path, which is often termed synchronous rectification. The losses from a fully-on FET are current * Rds(on) whereas losses from diode are current * Vf. Combine ...
by blundar
Wed May 26, 2021 6:02 am
Forum: You and your build
Topic: 1997 Ford F-150 5.4 E4OD
Replies: 44
Views: 10647

Re: 1997 Ford F-150 5.4 E4OD

Another note: High-speed Schottky diodes are generally a good choice for the flyback diodes for relatively low switching speeds. Reverse voltage only needs to be margin of error > Vsupply which will give a great selection of parts. They're generally pretty fast. Be mindful of both PEAK and AVERAGE c...
by blundar
Wed May 26, 2021 4:45 am
Forum: You and your build
Topic: 2004 BMW 760 N73 "A big mistake"
Replies: 176
Views: 39999

Re: 2004 BMW 760 N73 "A big mistake"

stefanst wrote:
Wed May 19, 2021 3:23 am
blundar wrote:
Tue May 18, 2021 10:45 pm
I nickname this car "sauerkraut"
Sauer = pissed, unhappy.

So, a pissed German? (not the English-English pissed)
yep... We can rename it when it's less pissed
by blundar
Wed May 26, 2021 4:41 am
Forum: You and your build
Topic: 1997 Ford F-150 5.4 E4OD
Replies: 44
Views: 10647

Re: 1997 Ford F-150 5.4 E4OD

Talking with dbh on slack, I have a rather strong feeling that the lack of a gate drive resistor in the circuit is to blame for component death. 6A (specified by MCP1407) is a *lot* of gate drive current for casual switching. The MOSFET doesn't specify Rgate so ASSuming it to be around 1ohm puts the...
by blundar
Tue May 18, 2021 10:45 pm
Forum: You and your build
Topic: 2004 BMW 760 N73 "A big mistake"
Replies: 176
Views: 39999

Re: 2004 BMW 760 N73 "A big mistake"

I nickname this car "sauerkraut"
by blundar
Mon May 17, 2021 4:25 am
Forum: Tuning Support: Making it Run
Topic: Idle tuning, Part 1
Replies: 11
Views: 7682

Re: Idle tuning, Part 1

With cable throttle, the throttle stop is an important factor affecting the minimum amount of air that can go through the throttle. When it closes, the throttle rests against the stop, but that doesn't mean that it restricts airflow completely. It's generally a good idea to adjust the throttle stop ...
by blundar
Mon May 17, 2021 4:09 am
Forum: Tuning Support: Making it Run
Topic: Cranking / starting part 1
Replies: 3
Views: 5041

Re: Cranking / starting part 1

Edited for clarity / more information Dec14-2021 DB For a rule of thumb, the the cranking RPM limit should be about 2.5x the fastest speed "starter" spins is a good estimate (i.e. 120 x 2.5 = 300 RPM). The cranking RPM limit is the speed at which the ECU stops using "cranking" lo...
by blundar
Mon May 17, 2021 3:33 am
Forum: Tuning Support: Making it Run
Topic: Cranking / starting part 1
Replies: 3
Views: 5041

Cranking / starting part 1

Again... it was asked to preserve some slack discussion on getting appropriate settings for cranking and starting the engine. Much like idle, this can be kind of tricky and there isn't an instrument you can put on an engine like a wideband for cranking. Overall strategy: -You need to get the motor s...
by blundar
Mon May 17, 2021 2:58 am
Forum: Tuning Support: Making it Run
Topic: Idle tuning, Part 1
Replies: 11
Views: 7682

Re: Idle tuning, Part 1

Automatic transmission special notes: Air changes slowly. There is a HUGE difference between PN and D airflow with an automatic transmssion. Once drive has been engaged, the torque converter and pump have to be spun. This is a much larger load on the engine. Strategy for tuning: 1. Map out airflow r...
by blundar
Mon May 17, 2021 2:44 am
Forum: Tuning Support: Making it Run
Topic: Idle tuning, Part 1
Replies: 11
Views: 7682

Re: Idle tuning, Part 1

Addendums for Special cases. if using a very light flywheel or torque converter, adjust the "normal" timing initial target HIGHER and pull down further with timing. Applying a higher idle entry can help too. Prepositioning / "dashpot" can also help prevent RPMs dropping too fast....
by blundar
Mon May 17, 2021 2:15 am
Forum: Tuning Support: Making it Run
Topic: Idle tuning, Part 1
Replies: 11
Views: 7682

Re: Idle tuning, Part 1

Overall general strategy: 1. You need a solid foundation to build on. Idle is built on top of general motor operation. The quality of your tune in terms of fuel and ignition close to / around idle will have a huge impact on idle quality. Try to get fueling in the region around idle tuned to a CONSIS...
by blundar
Mon May 17, 2021 12:35 am
Forum: Tuning Support: Making it Run
Topic: Idle tuning, Part 1
Replies: 11
Views: 7682

Idle tuning, Part 1

It was asked to preserve some of this so... Let me preface this that idle tuning is probably one of the HARDEST parts about making an engine run really well. It's not something like fueling that you can measure with an instrument(s). There's always more than one way to make an engine idle at a given...
by blundar
Fri May 14, 2021 1:48 am
Forum: Tuning Support: Making it Run
Topic: how does auto mode tb work
Replies: 1
Views: 1738

Re: how does auto mode tb work

I think you have a couple things confused but there is documentation on ETB auto configuration:

https://github.com/rusefi/rusefi/wiki/Electronic-Throttle-Body-Configuration-Guide
by blundar
Thu May 13, 2021 12:03 am
Forum: Tuning Support: Making it Run
Topic: EFI Part numbers and sources READ ME
Replies: 5
Views: 3291

Re: EFI Part numbers and sources READ ME

Ford Racing sell many of the injectors that are used OEM on Ford vehicles. They're generally pretty damn cheap, of extremely known origin and widely available. https://www.summitracing.com/search/part-type/fuel-injectors?N=brand%3Aford-performance-parts&SortBy=Default&SortOrder=Ascending&...
by blundar
Wed May 12, 2021 11:45 pm
Forum: Tuning Support: Making it Run
Topic: Honda D/B/H trigger patterns (Most Distributor Hondas)
Replies: 4
Views: 2254

Re: Honda D/B/H trigger patterns

The schematics that Honda used for decoding their VR sensors is available if you wanted to copy something that's literally been used hundreds of thousands of times. This would mean using the sensors inside the Honda distributor. You'd probably want to run coil on plug since it isn't 1995 anymore. ht...
by blundar
Wed May 12, 2021 11:37 pm
Forum: Tuning Support: Making it Run
Topic: Honda D/B/H trigger patterns (Most Distributor Hondas)
Replies: 4
Views: 2254

Re: Honda D/B/H trigger patterns

If you want to throw money at the problem to solve it, T1 has sold a special cam gear that has 13 rare earth magnets pressed into it for ~15 years. The cam gear has 12 magnets of one polarity evenly spaced for a "crank" signal. The cam gear has one magnet of the OPPOSITE POLARITY for a cam...
by blundar
Wed May 12, 2021 11:29 pm
Forum: Tuning Support: Making it Run
Topic: Honda D/B/H trigger patterns (Most Distributor Hondas)
Replies: 4
Views: 2254

Re: Honda D/B/H trigger patterns

One partial solution is the CKF or Crank Fluctuation Sensor. This sensor was added to some US market OBD2 vehicles. The CKF sensor has the same waveform as the CKP (crank) sensor, i.e. the high tooth count engine position sensor. It is thought that the CKF sensor was added to aid in misfire detectio...
by blundar
Wed May 12, 2021 11:22 pm
Forum: Tuning Support: Making it Run
Topic: Honda D/B/H trigger patterns (Most Distributor Hondas)
Replies: 4
Views: 2254

Honda D/B/H trigger patterns (Most Distributor Hondas)

Distributor Hondas present a slightly unique challenge for rusEFI. From the factory, 88-01(ish) D, B, H and F series engines came with distributors with ***3*** VR sensors inside. One wheel (crank / CKP) fired at 8 or 12 pulses/crank rev (16/24 teeth in distributor, spinning at camshaft speed. 95+ v...
by blundar
Sun May 09, 2021 11:02 pm
Forum: Tuning Support: Making it Run
Topic: Honda K24 ETB TPS issues
Replies: 14
Views: 4551

Re: Honda K24 ETB TPS issues

https://rusefi.com/online/view.php?msq=504

That appears to be his tune, Andrey.

I don't see an APP setup. That's kind of a requirement for DBW... I don't know how well things are going to configure if you don't..
by blundar
Sun Apr 25, 2021 3:16 am
Forum: You and your build
Topic: 1997 Ford F-150 5.4 E4OD
Replies: 44
Views: 10647

Re: 1997 Ford F-150 5.4 E4OD

dbh... https://www.ti.com/lit/ds/symlink/lm2903b.pdf LM2903/393/etc are about as basic bitch of a comparator as you can get. page 4 of datasheet covers voltage inputs: you can go from 0 to 36V BUT it is good practice to limit your input voltages to GND < Vin < Vsupply Comparators are *very* sensitiv...
by blundar
Sun Apr 25, 2021 2:59 am
Forum: You and your build
Topic: 1997 Ford F-150 5.4 E4OD
Replies: 44
Views: 10647

Re: 1997 Ford F-150 5.4 E4OD

it got sad, Andrey. It's what happens to depressed PCBs.
by blundar
Thu Apr 08, 2021 5:16 pm
Forum: You and your build
Topic: MRE Honda K sequential cam trigger configuration.
Replies: 18
Views: 4493

Re: MRE Honda K sequential cam trigger configuration.

MRE would have been awesome to use for my RB20DET I6 but it would have required a lot of fiddling because 6cyl. Sometimes certain engines just aren't a good fit. MRE is intended for the "easy" use cases - 4 cylinders, not too much VR, not too many engine position sensors. A floppy cam moto...
by blundar
Mon Mar 01, 2021 3:53 am
Forum: Dev: Hardware
Topic: Wideband Controller: Fully Custom, no ASIC!
Replies: 130
Views: 44545

Re: Wideband Controller: Fully Custom, no ASIC!

Update: a friend of mine has a contact at Bosch Motorsport which confirmed that the "17025" ( 0 280 017 025 ) sensor which is commonly available matches the Bosch Motorsport PDF data. Waiting to see if he will deny or confirm some of the other part numbers (17212, 17263, 17323) we have on ...