I gotta remember that wine-cork-w/-a-smaller-hole trick.
Thanks for the research!However, I always thought a lean idle would help saving fuel. Too bad it makes the car stall.
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| 4G37/4G63 SOHC: Possible upgrades for 4G15 ECU http://www.4g61t.org/forum/viewtopic.php?f=17&t=6396 |
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| Author: | socrateez [ Thu Dec 11, 2003 9:30 pm ] |
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Ive had some idle issues which ive tracked to two things. First was a bad O2 sensor connection. The second is that with the 4g37 injectors and MAF, the idle was way lean. It caused some surging and hesitation problems. Engine would stall when cold. Seems that the 4g15 ECU doesnt supply enough fuel for idle and part throttle with this setup. WOT is great. Since i dont have a SAFC to adjust fuel curves, i adjusted the amount of unmetered air by installing a plastic cap with a hole drilled into it into one of the bypass tubes. I had to try a few different size holes to find one that worked. Much better now! Seems the stock MAF would not supply enough unmetered air while the 4g37MAF supplys a little too much with the 4g15 ECU. I hope that 4g37 ECU will solve these probs. ( as soon as i get one ) |
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| Author: | The Ethereal [ Fri Dec 12, 2003 4:45 am ] |
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I gotta remember that wine-cork-w/-a-smaller-hole trick. Thanks for the research!However, I always thought a lean idle would help saving fuel. Too bad it makes the car stall. |
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| Author: | socrateez [ Fri Dec 12, 2003 7:43 am ] |
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It was waaay lean! Wouldnt even register on my A/F ratio guage! If i put my thumb over one of the holes it would shoot up. I have it set now so that it runs towards the lean side of stoich when at idle. Seems to run stoich when cruisin and rich when the pedal meets the carpet
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| Author: | The Ethereal [ Sat Dec 13, 2003 6:58 am ] |
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Great, this is the way it has to be. Woah I can't await to get that stuff myself. I may have a shot at a wrecked 4G37. |
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| Author: | Berserko [ Sat Dec 20, 2003 5:34 pm ] |
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To let you know I've got a line on a 4g37 ECU and injectorws we'll see in a few days I'll let you know my findings... |
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| Author: | socrateez [ Sat Dec 20, 2003 8:33 pm ] |
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Right on Berserko! My work doesnt have any at the moment.  I have noticed that the car seems to pull harder when its loaded with people than it did before. Top end seems to improve slightly. Anyone got a cheap SAFC?
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| Author: | danrfxt [ Thu Mar 18, 2004 11:09 pm ] |
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i have all i need here 4g63 sohc maf, injector, throtle, body, ecu (wreked 2000gtx) can i first try injector, thotle body and maf w/o the 4g63s ecu. and i got two question for you guys isnt possible to hack the 1.5 ecu or something like that? and is the 4g63s ecu will fit on my 4g15 8v? |
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| Author: | Berserko [ Fri Mar 19, 2004 7:10 am ] |
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If you don't run the ECU tou'll be running stinkin rich on a 4g15 ECU as for the ECU there is a VERY small percentage which are Eprom if it is then you can modify your ECU code... if not your stuck... I could check my mitchells but I think it will work fine G4CS (4664 SOHC) and 4g37 are the same wiring I'm willing to bet that 4g63 SOHC is the same too... BUT I HAVE NOT VERIFIED MYSELF SO TAKE MY OPINION FOR WHAT ITS WORTH.... |
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| Author: | The Ethereal [ Fri Mar 19, 2004 7:36 am ] |
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IMO it isn't worth to hack the 4G15 ECU, as EPROM versions of them are almost non-existant and the fuel maps are rather crude. While I haven't checked the 63 SOHC ECUs yet, I hope their fuel maps are somewhat moer sophisticated due to larger engine and injector size. |
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| Author: | Berserko [ Fri Mar 19, 2004 10:17 pm ] |
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Drum Roll.... The results are in.. I swapped in my 210cc injectors tonite along with mt 4g37 ECU I've had a G4CS MAF in for months and a 4g37 TB second crank it started (first crank was rebuilding fuel pressure...) and it ran pretty well now I have been running the car lean for a few months it was even more gutless than your average 4g15 putting the injectors and ECU definetly brought in more bottom end but I think I lost a bit up top but I only ran the car for like 5 mins so I might not have let the ECU larn everything idle was good and solid (maybe even a bit low)really surprising I thought it would idle high... But all in all I'm very happy with the mod we'll see how thirsty the car is at the pumps I'll keep you guys updated... |
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| Author: | danrfxt [ Fri Mar 19, 2004 10:39 pm ] |
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i own the mitsubishi haynes repair manual covering all four-cylinder models 83 thru 93 it seem that electric diagram are the same for all of those? is it really worth it to change all this, how many hp did you guy expect from this mod with the 63 sohc's stuff??? i'ts not very important for me cuz i probably gona do it. it's not really like i gona have to buy this stuff i already got it all in my back yard why not try! but i still a litlle bit septik about my capacity to do it all my self cuz im kind a newbi |
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| Author: | Berserko [ Fri Mar 19, 2004 10:44 pm ] |
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Its all easy stuff the ecu is 2 bolts the MAF 3 clips and a hose clamp, the TB is 4 bolts and a hose clamp. Could all be swapped in an hour and a half need help ask hear I'm sure someone could help.... |
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| Author: | danrfxt [ Fri Mar 19, 2004 11:18 pm ] |
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should i reset the ecu before i instal it on 1.5 and should i try to get a beter ignition coil ? |
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| Author: | Berserko [ Sat Mar 20, 2004 8:26 am ] |
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You need to pit in the 4g63 ECU so it will be pre reset for you.. |
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| Author: | danrfxt [ Sat Mar 20, 2004 2:44 pm ] |
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i just removed evrything i need from my 63 sohc the ecu, tb, maf and injectors there was 3 plug on the ecu 1-[+amp g] 2-[-amp g] 3-[-amp h] duno if it's lookin like the 37's but maybe this will help you telling me ? |
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