DIY_EFI Digest Monday, November 29 1999 Volume 04 : Number 666 In this issue: Anti-lag functions and throttle position mapping Re: Will there be a list?? TRD Supercharger Re: DIY_EFI Digest V4 #658 FW: New web site - progress ? private news server RE: Date: Mon, 29 Nov 1999 05:50:01 -0000 RE: Questions on ECU6 See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Mon, 29 Nov 1999 09:11:18 -0500 From: Rodney_L_Wiggins@xxx.com Subject: Anti-lag functions and throttle position mapping I have two questions I'm hoping someone here can help me with. First, Does anyone know of any of the current aftermarket EFI companies offering anti-lag functions like on the WRC ralley cars? I understand the computer just altered fuel and ignition timing during shifts to fire while the exhaust valve was opened. The result was that some of these cars could produce 15psi of boost at idle. The amount(?) of anti-lag was cockpit adjustable. Second, and more importantly, I'm having a bit of trouble with my Porsche 944 turbo. I've replaced the stock, very restrictive, flapper box with a large hot wire MAF using Split Second ARC-2 to filter the signal. The car also has a larger turbo, headwork, nitrous etc. The problem I'm having is the large turbo is apparently causing some sort of pulsation in the MAF. The resulting "noise" is causing some off-idle drivability problems. Once I apply more than 1/4 throttle, the signal to noise ratio improves and the car seems to perform fine. I was in the process of putting together a simple op-amp circuit to either limit maximum voltage from the MAF sensor when throttle is less than 1/4 or so, or replace the MAF signal with an amplified throttle signal up to 1/4 throttle. I realize the latter wouldn't compensate for load. My question is, is there anything on the market that I could use instead of making it myself? Prefferably something digital. I've been told that I'd have to buy a complete EFI system. Which might be worth it if I could also get Anti-lag and boost-control functions. Does my solution make sense? Any input you could provide would be very helpfull. The car has any early form of Bosch Motronic. Before some recent modifications the car was dynoed at 320 rear wheel HP without nitrous and 395HP 435TQ with nitrous. Thanks in advance, Rod Wiggins ------------------------------ Date: Mon, 29 Nov 1999 09:26:05 -0500 From: jsg@xxx.com Subject: Re: Will there be a list?? | Well, this is 11/26, and I though 12/1 was the ending date. Anyone have any | clues about what to do, about continuing the lists??. | Grumpy No, it's not like that. There is no hard date, but it is time to find a new home.... john gwynne ------------------------------ Date: Mon, 29 Nov 1999 09:43:16 -0500 From: Scott_Hay@xxx.com Subject: TRD Supercharger Re: DIY_EFI Digest V4 #658 Ed, The Vf is similar to GM's block learn and what everyone now calls fuel trim. The voltage ranges from 0v to 5.0v in .5v incriments. This value is based upon the ECM's learned fuel adjustment over time. If there is no adjustment to the base fuel schedule, it will read 2.5v. If the mixure is too lean and the injectors need to be richened, the voltage will increase in .5v steps up to 5.0v and lower than 2.5v if the mixture is leaned out due to a rich 02. I am not sure how reliable this number will be for WOT tuning as there is a time element to determine this voltage. It should be a good number for regular driving though. I will try to find out more for you from TRD. Scott Date: Tue, 23 Nov 1999 12:32:46 -0500 From: "Robert Wimmer" Subject: Re: TRD Supercharger Ed: 1) Your right that the stock FP on the 3.4 engine is 38-44 psi. I'm intending to install a FMU (rising rate FP regulator) along with the supercharger to increase the pressure to the 60 to 65 psi range. My major worry is how to set up the FMU so it does not boost the FP prematurely. 2) Do you know the range of the Vf signal and how it relates to either air or fuel flow? 3) I think the "Boost a Pump" you mention it triggered by boost pressure, not RPM. But I assume it could be modified to also trigger off of RPM. What I think is necessary for the best driveability and performance would be to raise the FP in two stages. First, increase FP 1/1 to compensate for manifold pressure, and let the AFM and ECU control A/F. When A/F starts to lean out at high RPM, increase FP to 60-65 psi. 4) I have traded e-mails with two of the 4Runner Webringers with TRD superchargers. They have solved their driveability problems by switching to aftermarket injectors, AFM and ECU. This solution is out of my price range and I am not sure it is necessary. Thanks, Bob Wimmer >>> 11/22 3:40 PM >>> >> This assumes a fuel rail pressure of 60-65psi. Is this correct? << It was my understanding that EFI pressure ratios were lower - like closer to 45psi. I may be wrong as I am more familiar with the 22RE than the later V6 engines. >> 2) Is there a way to determine when airflow will exceed the MAF and ECU's ability to maintain the proper A/F mixture at stock fuel pressure? I would like to have some idea when (RPM @WOT) to begin boosting fuel pressure prior to installing the supercharger. << Im curious if the later EFI systems still use the Vf trim signal. If so - this will give you a real close look at what the OEM EFI thinks is going on and how much adjustment is still avail (or NOT avail as the case may be). See if there is a connector marked "Vf" in the check connector box next tothe fuse box in the engine compartment >> 3) Is there a simple way to increase fuel pressure based on boost pressure and engine rpm? I would like to avoid running overly rich, due to increasing fuel pressure based strictly on boost, while still within the MAF control range. << I think there is a "Kenne Bell" "Boost a Pump" device that does this. Most people on this list appear to want to build their own decives from chips though. >> I guess if I'm really lucky, one of the list's readers will have installed and "dialed in" one of these TRD superchargers. << Check out the 4Runner Webring. There was at least one site that had a TRD "dial in" description. Try starting at the bottom of this page - fascianting Toyota stuff There is a 4Runner specific ring but I cant find it right now Ewong TIA, Bob Wimmer ------------------------------ Date: Mon, 29 Nov 1999 17:53:18 +0100 From: =?iso-8859-1?Q?S=F8ren_Nedergaard?= Subject: FW: New web site - progress ? FYI - -----Original Message----- From: Søren Nedergaard Sent: 26. november 1999 10:23 To: 'efi332@xxx.edu' Subject: New web site - progress ? Very soon we will see december pass by. I think it's time to decide where we would like our new web site to be hosted. Setting a deadline for the decision at the 10'th december seems reasonable to me - - what do you think ? My offer regarding Sunsite i still avaliable and im in the process og arranging the practical stuff with the staff at Sunsite. Due to vacation and christmas i'll have to have a decision latest on the 14'th december. Best regard Soeren Nedergaard ------------------------------ Date: Mon, 29 Nov 1999 09:31:27 -0800 From: "Frank M. Lin" Subject: private news server Yes, news server makes a lot of sense! Especially with all these web based boards going around (extremely slow). For a web site I'm maintaining (theoldone.com) I've been thinking about running news server off my box (b16a.com). Although I haven't had much time to looking at setting it up. I think someone recommended a news server called cyclone or something. If anybody has pointers to where I can find more info about setting a news server up, please let me know. Hmm, I can probably host the diy_efi news server while I'm at it too. - -- Frank M. Lin | http://www.g-speed.com/pbh Honda related tech files frank@xxx.com/pbh/fastest drag registry Field Electronics, Z.Speed, NASA, skunkworks http://www.g-speed.com The T.O.O. Archive, Endyn - Energy Dynamics http://www.TheOldOne.com ------------------------------ Date: Mon, 29 Nov 1999 10:15:32 -0800 From: "Al Lipper" Subject: RE: Date: Mon, 29 Nov 1999 05:50:01 -0000 The A/C was for an increased idle speed when air conditioning was turned on. I never used it, but the input is there for those who wish to. Al > -----Original Message----- > From: Daniel Yap Min Yi [mailto:duagu@xxx.com] > Sent: Sunday, November 28, 1999 9:42 PM > To: efi@xxx.org > Subject: Date: Mon, 29 Nov 1999 05:50:01 -0000 > > > hi al, about the Y1 12mhz..i forgot to look at the datasheet of the 80C51 > included in the ECU6 zip. anyway i realized it was a crystal. sorry to ask > you a lame question. > but could i ask you another lame question, why is the A/C On signal > connected to the external timer port for the 80C51?in the > ECU6.bas theres no > mention of it. > just to let you know, i wont be building the circuits for the fuel pump > relay and the output 1 as its running on compressed gas. > Thanks. sorry to take up your time. > ------------------------------ Date: Mon, 29 Nov 1999 10:47:12 -0800 From: "Al Lipper" Subject: RE: Questions on ECU6 > > Hi al, > just wanted to ask, if a wide range O2 sensor is needed for ECU6? No, it is a conventional heated EGO sensor. A wide range sensor would be nice, but they're a bit too expensive still. > what are these parts? > Y1 - 12 mhz It's a 12 Mhz crystal > L1 - inductor This is a 1uH (micro-Henry) coil (must handle at least 20v) > F1 - 1.2A A 1.2 amp glass mini-fuse > U11 - 4049 A CMOS hex inverter. Yes, this is the complete part number. They are very common. > and is there a manufacturer for this MOSFETD P ECG2984..2987 I think I mentioned in another inquiry that the MOSFET P is actually an ECG2371 or IRF9540. ECG numbered parts are available at most electronic supply stores and even TV repair shops. > for the capacitors, if i use electrolytic capacitors, are there > silkscreens on the board to indicate direction of flow? I've updated the ECU6.ZIP file on the web site - it now has the silkscreen in it. Thanks for the notice on that. > the part 28F010 is a AMD IC EEPROM? does it have a particular suffix like > AM28F010-150EI? or 150FI or 150PC? It's not an EEPROM, it is a flash memory. The suffix indicates the speed, package and temperature rating. Try a 120C3PC. > Al ------------------------------ End of DIY_EFI Digest V4 #666 ***************************** To subscribe to DIY_EFI-Digest, send the command: subscribe diy_efi-digest in the body of a message to "Majordomo@xxx. A non-digest (direct mail) version of this list is also available; to subscribe to that instead, replace "diy_efi-digest" in the command above with "diy_efi".