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Z32 Maf, injectors, programming, etc..
LAN... I've been wondering something for awhile, and *yes this is off topic... deal with it* (you can PM me the answer if you'd like)
I understand the basics of ECU decoding, however I in no way could do it myself. I've done some research specifically regarding the DSM ecu, and found how time consuming this process can be. I'm not sure if you've looked into products such as "Hondata" and "DSMlink" however I was wondering if this was even in the realm of possible. (laptop adjustable E-prom. basically lets the end user control most aspects of the stock ECU. PM if you have any questions about the tech) I know you probably don't want to put the time into it, as SVXes don't exactly have the most lively aftermarket, but if this was something that could be done with some basic programming and modified hardware, I think we could really get these cars preforming at a level beyond most peoples dreams. This would allow tuning with larger injectors, timing maps, really the possibilities are almost endless. Let me know if this is way out of our league as far as cost effective or even possible. Thanks
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Greg 97 Red SVX LSi clean 96 Black SVX LSi beater 90 Red Eclipse GSX track ho 99 Ford F250 work horse My Locker |
#2
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It's out of the league of the current market that's for sure. Both in price and in doability. The svx ECU isn't as easy to tune as others out there. It's a better ECU than the others but it has more things that need to be adjusted when fuel injectors need to be changed. Some of these things are particularliy hard to adjust. I make a point of only releasing products that I am confident people will have success with and I'm confident end user tuning for the svx right now would be a dissaster. I think with the stage 2v5 software out now that we've met the needs of pretty much everyone for the time being. There are those who insist on trying other things but if they come around they will find that the stage 2 software is all they need. This doesn't mean end user tuning will never be. Should the community develop to where it's a viable product to release then I will revisit the decision.
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#3
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The Z32 MAF will read 400HP of air right, so are the stock fuel injectors now the limiting factor?
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2005 Legacy GT 2002 WRX VF22, Pinks, big TMIC and turbo back 128,*** miles My WRX's Cardomain Page |
#4
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-Chike
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"Wise men talk because they have something to say; fools, because they have to say something." - Plato 2013 Cosmic Blue 5spd Evo X GSR 2006 Galaxy Gray 6MT RX-8 (sold) 2006 Steel Gray WRX TR (sold) 1996 Brilliant Red SVX L (sold) |
#5
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The z32 maf meter will read more like 550hp of air. The fuel injectors are the limiting factor but someone, I think bill or tom has tested them at higher fuel pressures and found that they perform well on up through 60 something psi. This thread is about pistons though....let's not hijack it.
People are finally going to cc the heads of both the ej22 and the svx; that's definitely someting we should keep on track on. It's about time. This year is looking great for the svx; people are actually doing stuff instead of debating it. Quote:
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#6
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Tom and I have both run 9 lbs of boost on the factory injectors. 9 lbs is way more than 300 hp.
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#7
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I agree with you 100%. Stuff is actually getting done this year. Keep up the great work Mike! -Chike
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"Wise men talk because they have something to say; fools, because they have to say something." - Plato 2013 Cosmic Blue 5spd Evo X GSR 2006 Galaxy Gray 6MT RX-8 (sold) 2006 Steel Gray WRX TR (sold) 1996 Brilliant Red SVX L (sold) |
#8
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I think a 6mt and a 300hp figure is more than enough. We still want to drive a reliable engine (lasting) with an acceptable fuel consumption. For most of us those cars are for daily usage.
We shouldn't forget these factors.
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Danny 1994 Silver SVX in hybernation, awaiting for the monsterous awakening (Lebanon) 1967 Mercedes-Benz 250SL Euro Specs, Hard/Softtop, White/Red. Under Complete Restoration 2013 Mercedes-Benz SL350 Euro Specs, White/Red. Mint... Another step into SL Collection. |
#9
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-Chike P.S. I never realized you're on the stock injectors LAN??? I thought the prototype used the nismos?
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"Wise men talk because they have something to say; fools, because they have to say something." - Plato 2013 Cosmic Blue 5spd Evo X GSR 2006 Galaxy Gray 6MT RX-8 (sold) 2006 Steel Gray WRX TR (sold) 1996 Brilliant Red SVX L (sold) Last edited by Chiketkd; 12-08-2005 at 01:58 PM. |
#10
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ya, this is a hijacking allright...... lol
you are correct about the bsfc on a supercharger being better than on a turbo. You are also correct that the stage 2 software will let you run higher duty cycles on the injectors. There is also a third factor that lets the injectors handle higher power--well for most of us: the automatic transmission. RPM is the largest contributor to when the fuel injectors will max out. The higher the rpm the less time the fuel injector has to deliver the fuel. At 6500 rpms there is a lot of time to deliver fuel, something like 18 ms. I don't remember the # for sure off the top of my head but I believe I calculated the base injector pulsewidth on a stock svx with factory injectors and software at max load to only be about 8ms. The stage 2 software further reduces the base injector pulsewidth calculated at higher load levels allowing you to achieve the correct fuel delivery by raising the fuel pressure rather than driving the injectors to higher duty cycles where they would overheat. Stage 2 does well for higher load levels from superchargers, turbos etc and stage 2 allows na cars to runner higher rpms to get more power. The limits of the injectors will most easily be reached by those attempting to run turbos at high rpms (so don't do that). Quote:
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#11
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Okay, end of hijack! -Chike
__________________
"Wise men talk because they have something to say; fools, because they have to say something." - Plato 2013 Cosmic Blue 5spd Evo X GSR 2006 Galaxy Gray 6MT RX-8 (sold) 2006 Steel Gray WRX TR (sold) 1996 Brilliant Red SVX L (sold) |
#12
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split and moved some posts to keep the piston thread on track and keep this good discussion going.
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. |
#13
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Quote:
-Chike
__________________
"Wise men talk because they have something to say; fools, because they have to say something." - Plato 2013 Cosmic Blue 5spd Evo X GSR 2006 Galaxy Gray 6MT RX-8 (sold) 2006 Steel Gray WRX TR (sold) 1996 Brilliant Red SVX L (sold) |
#14
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So-
Got my maf from Walter today. Will be ordering the stage 2 tomorrow. intake/exhaust setup: custom butcher exhaust K&N filtercharger (need to clean it) Intake silencer removed Will bumping up the fuel pressure at this point be worth anything on my setup or a waste of time for now.
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. |
#15
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I don't think you need to adjust the fuel pressure, as the Stage 2v5 chip will richen the afr similar to the stage 1v4 (or is it v5). With your mods and the Z32 MAF, your afr will probably remain nice and rich in the upper rpms. If you ever add a mod such as performance camshafts, then bumping up your fuel pressure will be needed. -Chike
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"Wise men talk because they have something to say; fools, because they have to say something." - Plato 2013 Cosmic Blue 5spd Evo X GSR 2006 Galaxy Gray 6MT RX-8 (sold) 2006 Steel Gray WRX TR (sold) 1996 Brilliant Red SVX L (sold) |
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