Search found 141 matches
- Mon Sep 27, 2021 12:49 pm
- Forum: Tuning Support: Making it Run
- Topic: Auto-tune does not produce good results
- Replies: 13
- Views: 17471
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...
- 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: 6953
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...
- 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: 20277
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...
- Sat Sep 18, 2021 3:09 am
- Forum: Dev: Hardware
- Topic: Hellen 125 Honda K
- Replies: 3
- Views: 4811
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.
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.
- Fri Jul 02, 2021 4:25 am
- Forum: You and your build
- Topic: '71 240Z w/ '82 280ZX L28 MRE project
- Replies: 19
- Views: 9585
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 ...
- Wed Jun 30, 2021 6:02 pm
- Forum: You and your build
- Topic: Rotary engine Rx8 in Florida
- Replies: 66
- Views: 31407
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...
- Wed May 26, 2021 6:06 am
- Forum: You and your build
- Topic: 1997 Ford F-150 5.4 E4OD
- Replies: 47
- Views: 28709
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 ...
- Wed May 26, 2021 6:02 am
- Forum: You and your build
- Topic: 1997 Ford F-150 5.4 E4OD
- Replies: 47
- Views: 28709
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...
- Wed May 26, 2021 4:45 am
- Forum: You and your build
- Topic: 2004 BMW 760 N73 "A big mistake"
- Replies: 198
- Views: 224982
- Wed May 26, 2021 4:41 am
- Forum: You and your build
- Topic: 1997 Ford F-150 5.4 E4OD
- Replies: 47
- Views: 28709
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...
- Tue May 18, 2021 10:45 pm
- Forum: You and your build
- Topic: 2004 BMW 760 N73 "A big mistake"
- Replies: 198
- Views: 224982
Re: 2004 BMW 760 N73 "A big mistake"
I nickname this car "sauerkraut"
- Mon May 17, 2021 4:25 am
- Forum: Tuning Support: Making it Run
- Topic: Idle tuning, Part 1
- Replies: 11
- Views: 29366
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 ...
- Mon May 17, 2021 4:09 am
- Forum: Tuning Support: Making it Run
- Topic: Cranking / starting part 1
- Replies: 3
- Views: 20995
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...
- Mon May 17, 2021 3:33 am
- Forum: Tuning Support: Making it Run
- Topic: Cranking / starting part 1
- Replies: 3
- Views: 20995
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...
- Mon May 17, 2021 2:58 am
- Forum: Tuning Support: Making it Run
- Topic: Idle tuning, Part 1
- Replies: 11
- Views: 29366
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...
- Mon May 17, 2021 2:44 am
- Forum: Tuning Support: Making it Run
- Topic: Idle tuning, Part 1
- Replies: 11
- Views: 29366
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....
- Mon May 17, 2021 2:15 am
- Forum: Tuning Support: Making it Run
- Topic: Idle tuning, Part 1
- Replies: 11
- Views: 29366
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...
- Mon May 17, 2021 12:35 am
- Forum: Tuning Support: Making it Run
- Topic: Idle tuning, Part 1
- Replies: 11
- Views: 29366
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...
- Fri May 14, 2021 1:48 am
- Forum: Tuning Support: Making it Run
- Topic: how does auto mode tb work
- Replies: 1
- Views: 3291
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
https://github.com/rusefi/rusefi/wiki/Electronic-Throttle-Body-Configuration-Guide
- Thu May 13, 2021 12:03 am
- Forum: Tuning Support: Making it Run
- Topic: EFI Part numbers and sources READ ME
- Replies: 5
- Views: 7459
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&...
- 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: 7565
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...
- 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: 7565
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...
- 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: 7565
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...
- 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: 7565
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...
- Sun May 09, 2021 11:02 pm
- Forum: Tuning Support: Making it Run
- Topic: Honda K24 ETB TPS issues
- Replies: 14
- Views: 8948
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..
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..
- Sun Apr 25, 2021 3:20 am
- Forum: You and your build
- Topic: 1997 Ford F-150 5.4 E4OD
- Replies: 47
- Views: 28709
- Sun Apr 25, 2021 3:16 am
- Forum: You and your build
- Topic: 1997 Ford F-150 5.4 E4OD
- Replies: 47
- Views: 28709
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...
- Sun Apr 25, 2021 2:59 am
- Forum: You and your build
- Topic: 1997 Ford F-150 5.4 E4OD
- Replies: 47
- Views: 28709
Re: 1997 Ford F-150 5.4 E4OD
it got sad, Andrey. It's what happens to depressed PCBs.
- Thu Apr 08, 2021 5:16 pm
- Forum: You and your build
- Topic: MRE Honda K sequential cam trigger configuration.
- Replies: 18
- Views: 9196
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...
- Mon Mar 01, 2021 3:53 am
- Forum: Dev: Hardware
- Topic: Wideband Controller: Fully Custom, no ASIC!
- Replies: 211
- Views: 586050
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 ...