when running DPFI boosted
04-22-2004, 09:51 PM
#1
0.0 BAR
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Join Date: Apr 2004
Posts: 21
when running DPFI boosted
alright i've been planning my turbo setup and i just got a deal of an IHI RHb5 and since i'm putting it on my dx which has DPFI it only has 2 injectors and so the IHI Rhb5 is running around 8 psi. so for the injectors since there is only 2 injectors should i go higher than 450cc? i was planning to just use a FMU but it is at 8psi (so i've been told) but if i grab a afc with higher injectors opposing the 450cc will i be good? unless there is a way to tone the boost down? oh yeah and i'm on a low budget turbo setup just planning to spend probably around 500 thanks! oh yeah and i don't want to convert to mpfi because it will be more time put into this car and i really don't want to do anything to this car i can't detach but if i turbo i can "detach" later and use it for future cars. also i went to the FAQs section and the "lower the boost" link isn't working 
04-22-2004, 10:21 PM
#4
3.0 BAR
Join Date: Jan 2004
Posts: 2,238
Re:when running DPFI boosted
have you seen what the dpfi injectors look like? when i did my swap i took them out, they look in now way shape or form like a dsm injector. not sure how you plan on working that out. i suggest the mpfi swap. cost you about 150 bux in parts and then you have a lot better, easier fuel system to work with.
04-22-2004, 10:31 PM
#5
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Join Date: Apr 2004
Posts: 21
Re:when running DPFI boosted
yeah i would take the mpfi route but i really not wanting to spend money on that because i'm getting another car soon and this is just for experience for turbo. checked homemadeturbo and this guy used 2 480cc Bosch Injector KIT SDS. his turbo is the same one i am getting but i'll be using an intercooler instead of water injection. is there any injector that will allow more fuel to be injected using dpfi?
04-23-2004, 02:53 AM
#7
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Join Date: Aug 2003
Posts: 3,930
Re:when running DPFI boosted
Spensers mini right up on adding more injectors for turbo fuel control.
1.Go to junkyard and get a couple cold start injectors(best bet would be a old toyota maxima, or any other fuel injected toyota). you have to use cold start injectors cause they have a %100 duty cycle. get the attached fuel line, and the clips.
2. Go to Napa, Buy a pressure switch, I don't know the exact name or the part number, but what it is, is a alittle switch that turns on when it reads say 1 psi,you can get ones for say 3 psi, 4 psi, ans so on, buy a couple of them. swindle the ugly women at the front counter to let you read through the books, you'll find it.
3. mount the cold start injectors some where on the intake pipe, or intak manifold, Run the fuel lines from the fuel somewhere, this is very hard, lol.
4. drill a hole in the Intake manifold and mount the pressure switch for 1 psi, hook it up to a injector, mount a couple more switches and injectors for various pressures,
5. don't boost too much and get that bad boy on a wideband, or EGT or anything, jeust add more injectors if it leans out, and remove a injector if it's too rich, you can also play with the configurations a bit, and have 2 injectors come on at say 2 psi, instead of just one.
Thats the cheapest way of going at it, and it's not bad fuel control, your clutch will slip like mother ******, and you'll probly blow your engine up, but thats what it costs being canadian, oops I mean ghetto. lol
1.Go to junkyard and get a couple cold start injectors(best bet would be a old toyota maxima, or any other fuel injected toyota). you have to use cold start injectors cause they have a %100 duty cycle. get the attached fuel line, and the clips.
2. Go to Napa, Buy a pressure switch, I don't know the exact name or the part number, but what it is, is a alittle switch that turns on when it reads say 1 psi,you can get ones for say 3 psi, 4 psi, ans so on, buy a couple of them. swindle the ugly women at the front counter to let you read through the books, you'll find it.
3. mount the cold start injectors some where on the intake pipe, or intak manifold, Run the fuel lines from the fuel somewhere, this is very hard, lol.
4. drill a hole in the Intake manifold and mount the pressure switch for 1 psi, hook it up to a injector, mount a couple more switches and injectors for various pressures,
5. don't boost too much and get that bad boy on a wideband, or EGT or anything, jeust add more injectors if it leans out, and remove a injector if it's too rich, you can also play with the configurations a bit, and have 2 injectors come on at say 2 psi, instead of just one.
Thats the cheapest way of going at it, and it's not bad fuel control, your clutch will slip like mother ******, and you'll probly blow your engine up, but thats what it costs being canadian, oops I mean ghetto. lol
04-23-2004, 08:32 AM
#8
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Thread Starter
Join Date: Apr 2004
Posts: 21
Re:when running DPFI boosted
yeah that really seems like alot of work, isn't there injectors that will fit the dpfi manifold? it's only 2 injectors i would have to buy haha. i will only be running 7psi and i figured if i have 480cc injectors or greater it would be equivilent of running 4 stock ones and i will be using the afc most likely.
04-23-2004, 01:14 PM
#9
3.0 BAR
Join Date: Aug 2003
Posts: 3,930
Re:when running DPFI boosted
the injectors that are in the DPFI manifold are fucked up looking, there not the same as other injectors, I doubt you can replace them with higher flow ones. So the way I see it, is either got MPFI, or do what the cold start injector thing, you really only need one or two cold start injectors.
04-23-2004, 01:40 PM
#10
1.5 BAR
Join Date: Dec 2002
Posts: 1,330
Re:when running DPFI boosted
i currently working on a project with dpfi. ill have pics up sometime next week. i just used a fmu. the boost will probably be around 6psi (carb spring) non-intercooled. i figure i'll get 2 weeks out of it before the motor eats ----.
