Myxalplyx Posted September 8, 2005 Share Posted September 8, 2005 I got this quote from another thread: SPFI cars, like yours (it's a Loyale) have only one injector in the throttle body.MPFI cars (1985 GL-10, XT's, and all turbo cars) have one injector per cylinder. They also have a special intake manifold and heads that differ from carb/SPFI cars. Is it possible to put the throttle body of a single fuel injected car on a fuel injected turbo model and then use the extra injector as extra fuel? I understand the intake manifold and heads being different but maybe the throttle body can possibly be fitted. Just a thought! Link to comment Share on other sites More sharing options...
mattyg41383 Posted September 9, 2005 Share Posted September 9, 2005 I dont have an answer, but that is a pretty slick solution. A little cleaner than the cattywompus way i did my 5th injector. Link to comment Share on other sites More sharing options...
Myxalplyx Posted September 9, 2005 Author Share Posted September 9, 2005 I dont have an answer, but that is a pretty slick solution. A little cleaner than the cattywompus way i did my 5th injector. Yeah, but your way works. Speaking of your way....I'll be sending you a PM. Link to comment Share on other sites More sharing options...
Do It Sidewayz Posted September 9, 2005 Share Posted September 9, 2005 problem being is that the SPFI fuel injector is made to flow enough fuel for the EA82 by itself. I think you will find it too large for an extra injector Link to comment Share on other sites More sharing options...
oddcomp Posted September 9, 2005 Share Posted September 9, 2005 not if the pulse width is controlled correctly instead of just either on or off Link to comment Share on other sites More sharing options...
Do It Sidewayz Posted September 9, 2005 Share Posted September 9, 2005 not if the pulse width is controlled correctly instead of just either on or off agreed...however 2 smaller injectors is better than one large in this application Link to comment Share on other sites More sharing options...
kingbobdole Posted September 9, 2005 Share Posted September 9, 2005 I've been to lazy to look at my parts... I was thinking of doing this (since Rick actually brought it up) to my soon to be turbo XT6.... I would think you could add the injector to the existing TB and then wire up the SPFI computer to share all the output of the stock computers sensors then it would also be self correcting.... I just wired up the SPFI for my wagon... I could do it again.. just gotta go dig in the backyard for my parts and glue them togather:drunk: Link to comment Share on other sites More sharing options...
archemitis Posted September 9, 2005 Share Posted September 9, 2005 the only big problem i see is that the spfi injector is a huge bottle neck. it chokes down to about 1/3 the size of the wide open throttle body. i dont think runing the complete spfi computer for the single injector would work, you dont need any extra fuel untill you hit boost, and the spfi wouldnt know this. you could put the spfi computer on a boost activated switch, to turnon only when the car is under boost... but then it seems just as easy to wire up a fifth injector in the manifold. i think its too much complication, when all you realy need is a boost switch, a home made controll module, and a bosh cold start injector. http://www.thedodgegarage.com/turbo_extrainj.html that seems way cooler Link to comment Share on other sites More sharing options...
kingbobdole Posted September 10, 2005 Share Posted September 10, 2005 i dont think runing the complete spfi computer for the single injector would work, you dont need any extra fuel untill you hit boost, and the spfi wouldnt know this. i think its too much complication, when all you realy need is a boost switch, a home made controll module, and a bosh cold start injector. I disagree with this. Firstly the SPFI can cut fuel completely and would do so, but I think you might get the "dueling banjos" effect where the two fuel systems would try and overtake each other for which was running the show. It does seem complicated, but would result in a more managabe fuel correction instead of just dumping "A" amount of fuel into the engine at "This" time. Link to comment Share on other sites More sharing options...
BoostedBalls Posted September 10, 2005 Share Posted September 10, 2005 Just go with the 5th injector, I've been running mine for a long time and it works great and is way simple. maybe use two maller ones and stage them closely. I'm about to instal a 6th injector to come on at 19-23 psi. My single injector has kept my engine together at 19psi and I'm running 14.20 seconds in the 1/4 pretty consistantly. Same with my gl-10 last year, it had 200k on the engine. Link to comment Share on other sites More sharing options...
archemitis Posted September 10, 2005 Share Posted September 10, 2005 Just go with the 5th injector, I've been running mine for a long time and it works great and is way simple. maybe use two maller ones and stage them closely. I'm about to instal a 6th injector to come on at 19-23 psi. My single injector has kept my engine together at 19psi and I'm running 14.20 seconds in the 1/4 pretty consistantly. Same with my gl-10 last year, it had 200k on the engine. yar! a time tested method. Link to comment Share on other sites More sharing options...
Myxalplyx Posted September 10, 2005 Author Share Posted September 10, 2005 Just go with the 5th injector, I've been running mine for a long time and it works great and is way simple. maybe use two maller ones and stage them closely. I'm about to instal a 6th injector to come on at 19-23 psi. My single injector has kept my engine together at 19psi and I'm running 14.20 seconds in the 1/4 pretty consistantly. Same with my gl-10 last year, it had 200k on the engine. You need to start selling this for us dumb people (like me). Link to comment Share on other sites More sharing options...
kingbobdole Posted September 16, 2005 Share Posted September 16, 2005 Strange question.. and thread slight hijack...... Has anyone ever turbo'd an SPFI car? Seems like you could take the regular turbo stuff and just drop it on.... ... ... and since my wagons freshly converted to SPFI... so its lower compression.... and I have said turbos/manifolds and such..... Link to comment Share on other sites More sharing options...
oddcomp Posted September 16, 2005 Share Posted September 16, 2005 umm bob.. the spfi/carbonated hehe cars are higher cr than the turbo cars so dropping turbo on a stock spfi block would result in a high comp turbo motor and with out being able to re adjust the stock ecu to fuel it correctly you can look forward to melted pistons and such .. Link to comment Share on other sites More sharing options...
archemitis Posted September 16, 2005 Share Posted September 16, 2005 umm bob.. the spfi/carbonated hehe cars are higher cr than the turbo cars so dropping turbo on a stock spfi block would result in a high comp turbo motor and with out being able to re adjust the stock ecu to fuel it correctly you can look forward to melted pistons and such .. not true, several people have used the spfi block (9.5:1)compression with turbos with no problem. you can safely turbo 11:1 compression as long as its tuned properly. the increased compression does not warrant any ecu or fuel adjustments. only boost. the spfi computer wont give you enough fuel because it wasnt designed to be turboed.... but since its a hotwire it will take "some boost" without problems though i think 4 lbs is about the tops with the stock spfi stuff, and no other mods. its been done a couple times;) Link to comment Share on other sites More sharing options...
kingbobdole Posted September 16, 2005 Share Posted September 16, 2005 not true, several people have used the spfi block (9.5:1)compression with turbos with no problem. you can safely turbo 11:1 compression as long as its tuned properly.the increased compression does not warrant any ecu or fuel adjustments. only boost. the spfi computer wont give you enough fuel because it wasnt designed to be turboed.... but since its a hotwire it will take "some boost" without problems though i think 4 lbs is about the tops with the stock spfi stuff, and no other mods. its been done a couple times;) Yeah.. Roni/Cutie-ru/my girl friend has Steves old 9.5:1 Turbo XT... running the stock EFI system... no issues at all... Maybe at sea level without intercooled, but I dount that I'll have problems with a carb block as I'm pretty sure the carb has lower compression the the EFI blocks... but still higher then the turbo compression... I plan to only run "some boost" mostly for the fuel milage:rolleyes: Link to comment Share on other sites More sharing options...
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