DirtyDeeds Posted January 1, 2017 Share Posted January 1, 2017 ok guys here in the next month I'm going to be starting working on my 87 mj again and I'm re-doing the whole fuel system to prep it for a Eaton M90 supercharger!! i want to ear some opinions on fuel injectors. i red a few forums that sat the Volvo injectors work best in the renix jeeps and the 4 hole bosch seams to be the most popular option. so i wana hear what results you have gotten with what. also, has any one used the bosch 12 hole injectors? and if any ones got a boosted 4.0 out there lmk how your rig is set up!! Link to comment Share on other sites More sharing options...
desbennett004 Posted January 1, 2017 Share Posted January 1, 2017 What kind of boost will you be running, and what will your AFR be? That's were I would start. Sent from my SM-N900W8 using Tapatalk Link to comment Share on other sites More sharing options...
DirtyDeeds Posted January 1, 2017 Author Share Posted January 1, 2017 well without pulleys the m90 maxes out at 9-12 psi max, so supper low. no matter what ill need better injectors. as far as AFR I'm still trying to figure out a good way to adjust it. Renix doesn't leave much options as far as that. later down the road a ecm will come in but thats a ways down the road. but at the low boost ill be running the factory set up should be able to keep up. Link to comment Share on other sites More sharing options...
DirtyDeeds Posted January 1, 2017 Author Share Posted January 1, 2017 oh any tips on how to adjust the fuel peddle? it sits low and bottoms out after like to inches. the cable dosent seem to be adjustable in any way ether Link to comment Share on other sites More sharing options...
mikekaz1 Posted January 3, 2017 Share Posted January 3, 2017 Bend the pedal. The throw should only be a few inches. Sounds like it's correct. Link to comment Share on other sites More sharing options...
cruiser54 Posted January 3, 2017 Share Posted January 3, 2017 http://cruiser54.com/?p=438 Link to comment Share on other sites More sharing options...
DirtyDeeds Posted January 5, 2017 Author Share Posted January 5, 2017 http://cruiser54.com/?p=438 thanx thats a huge help there!! i noticed one of the comments mentioned putting a 90' ECU in his 87 XJ. would there be any real benefit to doing this? obviously the 90' ECU would be tuned for the High Output engine, so what would be the end results? Link to comment Share on other sites More sharing options...
cruiser54 Posted January 5, 2017 Share Posted January 5, 2017 http://cruiser54.com/?p=438 thanx thats a huge help there!! i noticed one of the comments mentioned putting a 90' ECU in his 87 XJ. would there be any real benefit to doing this? obviously the 90' ECU would be tuned for the High Output engine, so what would be the end results? Not tuned for the HO. That's another story. Put an 89 to 90 ECU in it. You'll love it. Link to comment Share on other sites More sharing options...
DirtyDeeds Posted January 5, 2017 Author Share Posted January 5, 2017 http://cruiser54.com/?p=438 thanx thats a huge help there!! i noticed one of the comments mentioned putting a 90' ECU in his 87 XJ. would there be any real benefit to doing this? obviously the 90' ECU would be tuned for the High Output engine, so what would be the end results? Not tuned for the HO. That's another story. Put an 89 to 90 ECU in it. You'll love it. any tips on where to get one? i don't trust the junk yard for electronics, and ant tips on replacing it? never really looked at it but just a glance. Link to comment Share on other sites More sharing options...
HOrnbrod Posted January 5, 2017 Share Posted January 5, 2017 Got a plan how you're going to tune the M90 on a Renix system? Link to comment Share on other sites More sharing options...
DirtyDeeds Posted January 5, 2017 Author Share Posted January 5, 2017 Got a plan how you're going to tune the M90 on a Renix system? well the m90 is a small low boost supercharger, in the thunder-birds where this version is from and even the gran ams that use them they use the same computers as the none boosted models. in "theory" the factory set up should be able to keep up. its only going to be running 12psi max anyways and I'm going to use a blow off valve and start at 6psi and work my way up in testing. I'm re doing the whole fuel system and have a 125psi fuel pump, o in theory if the o2s run lean the ecm should open the injectors more and with me new fpr I'm using i should be able to meet the necessary fuel requirements, I'm still trying to figure out if ill have to do anything with timing or not yet. at such low boost i don't expect ill have to retard timing any. Link to comment Share on other sites More sharing options...
cruiser54 Posted January 5, 2017 Share Posted January 5, 2017 I did a Miata with 10 pounds of boost from a supercharger and had to have timing retard, an auxiliary fuel pressure regulator, knock sensor, and an in dash O2 sensor reading. . Link to comment Share on other sites More sharing options...
mikekaz1 Posted January 5, 2017 Share Posted January 5, 2017 whats the difference between the 87 and 90 ECU? Link to comment Share on other sites More sharing options...
cruiser54 Posted January 5, 2017 Share Posted January 5, 2017 whats the difference between the 87 and 90 ECU? 9 horsepower. Link to comment Share on other sites More sharing options...
DirtyDeeds Posted January 5, 2017 Author Share Posted January 5, 2017 I did a Miata with 10 pounds of boost from a supercharger and had to have timing retard, an auxiliary fuel pressure regulator, knock sensor, and an in dash O2 sensor reading. . well i plan on having a wide band AFR gauge no matter what to monitor my AFR, and I'm already going to have a aftermarket boost referenced fuel pressure regulator that can do 3-65psi and having a custom fuel rail made, I'm also planning in running both a inrtcooler and a fuel cooler as well. the only thing i havent figured out is retarding/advancing timing if i need to and doing a knock sensor if i need one. how do you adjust timing on the 4.0? do use a timing light and turn the distributor or what i havent ever looked tbh Link to comment Share on other sites More sharing options...
mikekaz1 Posted January 6, 2017 Share Posted January 6, 2017 whats the difference between the 87 and 90 ECU? 9 horsepower. Ooooo. Fancy! What is it just programming updates? Link to comment Share on other sites More sharing options...
HOrnbrod Posted January 6, 2017 Share Posted January 6, 2017 well i plan on having a wide band AFR gauge no matter what to monitor my AFR, and I'm already going to have a aftermarket boost referenced fuel pressure regulator that can do 3-65psi and having a custom fuel rail made. the only thing i havent figured out is retarding/advancing timing if i need to and doing a knock sensor if i need one. how do you adjust timing on the 4.0? do use a timing light and turn the distributor or what i havent ever looked tbh By using an external controller wired into the ECU harness, like A Unichip or Split Second FTC. But that ain't going to work with a Renix. That's why I asked you above how you are going to tune it........... Link to comment Share on other sites More sharing options...
DirtyDeeds Posted January 6, 2017 Author Share Posted January 6, 2017 well i plan on having a wide band AFR gauge no matter what to monitor my AFR, and I'm already going to have a aftermarket boost referenced fuel pressure regulator that can do 3-65psi and having a custom fuel rail made. the only thing i havent figured out is retarding/advancing timing if i need to and doing a knock sensor if i need one. how do you adjust timing on the 4.0? do use a timing light and turn the distributor or what i havent ever looked tbh By using an external controller wired into the ECU harness, like A Unichip or Split Second FTC. But that ain't going to work with a Renix. That's why I asked you above how you are going to tune it........... so my options then to prevent knock are going to be with octane and fuel/air temp. hmmm from what I'm reading the ecu controls all the timing through the cps tht said theres no way the ecm can adjust timing based on sfr or be changed... that will take some thought. well if there wasnt road blocks on custom projects they wouldnt be fun right? :laughin: Link to comment Share on other sites More sharing options...
cruiser54 Posted January 6, 2017 Share Posted January 6, 2017 well i plan on having a wide band AFR gauge no matter what to monitor my AFR, and I'm already going to have a aftermarket boost referenced fuel pressure regulator that can do 3-65psi and having a custom fuel rail made. the only thing i havent figured out is retarding/advancing timing if i need to and doing a knock sensor if i need one. how do you adjust timing on the 4.0? do use a timing light and turn the distributor or what i havent ever looked tbh By using an external controller wired into the ECU harness, like A Unichip or Split Second FTC. But that ain't going to work with a Renix. That's why I asked you above how you are going to tune it........... so my options then to prevent knock are going to be with octane and fuel/air temp. hmmm from what I'm reading the ecu controls all the timing through the cps tht said theres no way the ecm can adjust timing based on sfr or be changed... that will take some thought. well if there wasnt road blocks on custom projects they wouldnt be fun right? :laughin: https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=boost+timing+retard+control Link to comment Share on other sites More sharing options...
cruiser54 Posted January 6, 2017 Share Posted January 6, 2017 My Miata had an ECU like a REnix. It was a 1990. AFPR to increase fuel pressure under boost. No new fuel rail needed. It fits into the fuel return line to the tank. It had an add-on knock sensor that would retard the timing before detonation occured. Link to comment Share on other sites More sharing options...
Ωhm Posted January 6, 2017 Share Posted January 6, 2017 O2 sensors operate within a range of authority, that is, they can only control PW so much. Link to comment Share on other sites More sharing options...
DirtyDeeds Posted January 6, 2017 Author Share Posted January 6, 2017 My Miata had an ECU like a REnix. It was a 1990. AFPR to increase fuel pressure under boost. No new fuel rail needed. It fits into the fuel return line to the tank. It had an add-on knock sensor that would retard the timing before detonation occured. I'm only making a custom fuel rail so i can have -8 AN treads on each end and so i can place my regulator on my return side of my rail and eliminate oem regulator that probably wouldnt reference boost well. and from the basic search you turned me on to retarding the timing shouldnt be a issue ether, just have to find the right controller. Link to comment Share on other sites More sharing options...
DirtyDeeds Posted January 6, 2017 Author Share Posted January 6, 2017 this is the timing control I'm looking into, but i have to get with MSD and find the right ignition control to match it, but it should solve that problem. knock sensors ive seen a few kits around $200 that seem good. anything else i need to touch base on? https://www.msdperformance.com/products/rpm_and_timing_controls/timing_controls/parts/8680 Link to comment Share on other sites More sharing options...
HOrnbrod Posted January 7, 2017 Share Posted January 7, 2017 I did a Miata with 10 pounds of boost from a supercharger and had to have timing retard, an auxiliary fuel pressure regulator, knock sensor, and an in dash O2 sensor reading. . Was this your Miata? Do you drink Heineken? :rotfl2: Link to comment Share on other sites More sharing options...
gogmorgo Posted January 7, 2017 Share Posted January 7, 2017 Or was is this one? meKColX.mp4 Link to comment Share on other sites More sharing options...
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