Hello
Im new to the 240sx world, I recently aquired a 93 model. I have a few questions that im hoping can be answered. I plan to turbocharge the ka24de, with the ultimate goal of ~300rwhp nothing more. Im new to the world of maf sensors and have been trying to find the best fuel system that would get me there.
I first plan to fabricate a simple system with the goal of ~200rwhp. Now can the stock injectors get me there? I read that the stock maf can go to ~250rwhp, but what about the injectors? On all my other cars, if the injectors are too small for desired hp a boost sensentive fpr is added, but in my searches i don't see anyone using one. Why? What size is the stock injectors (i read somewhere they are 270cc), also how large can the injectors be before the ecu goes crazy and cant compensate.As it sits right now for my inital goals of 200rwhp i am going with walbro 255lph pump, stock injectors, stock maf, and vortech sfmu (with correct rate gain for 12:1 A/F @ full boost). How does that sound?
For my goals of 300rwhp i don't know what to do. I read a lot of people using the jwt ecu remap, with corba maf, and 50LBS injectors, walbro pump, a s-afc for fine tuning. This seems like a good way because i like not having to worrying about fuel maps, rewiring, crank signals, and all those other headaches, but is there any other possiblitities. Could I just go with a piggy back, msd for ignition, cobra maf, and 50LBS? This way seems a lot cheaper.
For the fuel rail issue, i keep on reading differnet things. What size fuel injectors fit the fuel rail and when do you have to upgrade? If anyone has any suggests please comment I just trying to gather as much info on this car. Also another issue i keep reading mix answers on is can the cobra maf be used with the stock ecu and a piggyback or just the z32 maf?
Lastly what is different between the s13 and s14 engines in terms of fuel issue and turbo's?
JUST PICKED UP A 240SX need some information
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prophet_ca
- Posts: 5
- Joined: Sat Apr 17, 2004 3:46 pm
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prophet_ca
- Posts: 5
- Joined: Sat Apr 17, 2004 3:46 pm
I have been searching... A lot of these threads have good information, most of the replys are utterly useless though (A person would ask a question and by page 4 the thread is totally onto somthing else, or the thread just dies out)...
What i have learnt is that my intial setup will be fine, but for my second step im not sure. The piggyback topics have no real relevent information and some turn to pissing matches.
I guess i'll continue searching, thanks
What i have learnt is that my intial setup will be fine, but for my second step im not sure. The piggyback topics have no real relevent information and some turn to pissing matches.
I guess i'll continue searching, thanks
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prophet_ca
- Posts: 5
- Joined: Sat Apr 17, 2004 3:46 pm
thanks for the info, but i would rather build my own (would be a lot cheaper). I'm not new to turbocharging and I have lots of various parts laying around from previous projects. The only thing i would need to buy is the fuel pump, and i can tig weld my own manifold. I do thank you for referring me to that site because that manifold is pretty nice design (better than the log style i had planned). That kit is okay, but for that price i can fabricate the same thing and have money left over for suspension modifications.k6kicker wrote:you may just want to look into the iap kit...its rpetty reasonable and comes with EVERYTHING maybe you can even jump on the stage 2 and get some internals and all since im not too sure how the stock ones would handle 300 hp
Re: JUST PICKED UP A 240SX need some information
because they aren't very adjustable for fine tuning, and they aren't very reliable. Besides, they don't let you change the timing at all.prophet_ca wrote:in my searches i don't see anyone using one.(fmu) Why?
Quote » What size is the stock injectors (i read somewhere they are 270cc),[/quote] 270 baby
Quote »also how large can the injectors be before the ecu goes crazy and cant compensate.[/quote] anything bigger than 270 and your stock ecu won't be able to handle it without some sort of fuel management.
Quote »As it sits right now for my inital goals of 200rwhp i am going with walbro 255lph pump, stock injectors, stock maf, and vortech sfmu (with correct rate gain for 12:1 A/F @ full boost). How does that sound?[/quote] that sounds about right, I think the 8:1 fmu is the one to use. adjustable would be even better.
Quote »For my goals of 300rwhp i don't know what to do. I read a lot of people using the jwt ecu remap, with corba maf, and 50LBS injectors, walbro pump, a s-afc for fine tuning. This seems like a good way because i like not having to worrying about fuel maps, rewiring, crank signals, and all those other headaches, but is there any other possiblitities. [/quote] you probably won't need an safc if you get JWT remap. In place of the JWT you could go with an safc and a BTM but for the price it usually ends up being cheaper to get a retune, plus they do the tuning for you.
Quote »Could I just go with a piggy back, msd for ignition, cobra maf, and 50LBS? This way seems a lot cheaper.[/quote] cheaper? jwt ecu is like 500 if you pay full price (they go used for less all the time, mine was 300 and hadn't even been used). standalone (sds) starts at 900 or so with no options... and its a total ***** to setup at first.
Quote »For the fuel rail issue, i keep on reading differnet things. What size fuel injectors fit the fuel rail and when do you have to upgrade? [/quote] stock fuel rail, you can fit just about any nissan side feed. stock 270's, sr20/z32tt 370's, S15 440?, tomei/nismo 550's, tomei 720 (7something hundred anyway) or even the border 850cc sr20rail and injectors fit. Or you could get 50 or 72 lb top feeds and a custom fuel rail (mustang GT fits btw) for about the same price. You can defintely do a search on the various options listed above.
Quote »If anyone has any suggests please comment I just trying to gather as much info on this car. Also another issue i keep reading mix answers on is can the cobra maf be used with the stock ecu and a piggyback or just the z32 maf?[/quote] I think there are issues using a cobra mafs with something like an afc, as far as I know its a non nissan mafs and jwt does a lil sumthin sumthin to the computer to let them talk. Prolly best to stick with a Z32. And if you are switching to a piggback, don't be a doofus- use a ****ing map sensor and ditch mafs all together. Its what we would all do if we could anyway.
Quote »Lastly what is different between the s13 and s14 engines in terms of fuel issue and turbo's? [/quote]
um, huh?
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prophet_ca
- Posts: 5
- Joined: Sat Apr 17, 2004 3:46 pm
thank you...
Quote »because they aren't very adjustable for fine tuning, and they aren't very reliable. Besides, they don't let you change the timing at all. [/quote]How much of an issue is timing on a 93 240sx @ low boost, is it really agressive?
Quote »that sounds about right, I think the 8:1 fmu is the one to use. adjustable would be even better.[/quote]the vortech sfmu is adjustable, and i have used it before works flowless -- on map cars anyways...
Quote »anything bigger than 270 and your stock ecu won't be able to handle it without some sort of fuel management. [/quote]Okay can the ecu handle low fuel pressure then stock is 3bar right, what would happen if you went say 36lb/hr with 18-20psi and tuned the rrfpr according (just a hypothetical question)
Quote »cheaper? jwt ecu is like 500 if you pay full price (they go used for less all the time, mine was 300 and hadn't even been used). standalone (sds) starts at 900 or so with no options... and its a total ***** to setup at first. [/quote]Quote »I think there are issues using a cobra mafs with something like an afc, as far as I know its a non nissan mafs and jwt does a lil sumthin sumthin to the computer to let them talk. Prolly best to stick with a Z32. And if you are switching to a piggback, don't be a doofus- use a ****ing map sensor and ditch mafs all together. Its what we would all do if we could anyway[/quote]The reason i say it's cheaper is because i can get good deals on the stm6 piggyback. What voltage does the maf run on 5V, if so making the cobra maf "talk" with ecu wouldn't be that hard and an msd boost retard is fairly cheap. The ecu does better instead of hacking.
Quote »because they aren't very adjustable for fine tuning, and they aren't very reliable. Besides, they don't let you change the timing at all. [/quote]How much of an issue is timing on a 93 240sx @ low boost, is it really agressive?
Quote »that sounds about right, I think the 8:1 fmu is the one to use. adjustable would be even better.[/quote]the vortech sfmu is adjustable, and i have used it before works flowless -- on map cars anyways...
Quote »anything bigger than 270 and your stock ecu won't be able to handle it without some sort of fuel management. [/quote]Okay can the ecu handle low fuel pressure then stock is 3bar right, what would happen if you went say 36lb/hr with 18-20psi and tuned the rrfpr according (just a hypothetical question)
Quote »cheaper? jwt ecu is like 500 if you pay full price (they go used for less all the time, mine was 300 and hadn't even been used). standalone (sds) starts at 900 or so with no options... and its a total ***** to setup at first. [/quote]Quote »I think there are issues using a cobra mafs with something like an afc, as far as I know its a non nissan mafs and jwt does a lil sumthin sumthin to the computer to let them talk. Prolly best to stick with a Z32. And if you are switching to a piggback, don't be a doofus- use a ****ing map sensor and ditch mafs all together. Its what we would all do if we could anyway[/quote]The reason i say it's cheaper is because i can get good deals on the stm6 piggyback. What voltage does the maf run on 5V, if so making the cobra maf "talk" with ecu wouldn't be that hard and an msd boost retard is fairly cheap. The ecu does better instead of hacking.
I don't know the voltage, I'm using Z32. I also dont know the answer to the question about larger injectors with FMU. sounds like if the unit is adjustable you could play around with it to make it work... at that point in time you might want an safc to help. and once you spend that much....you are getting well into the point where you will want something better that will cost you about the same.at low boost (7 psi and under) retarded stock timing will be fine. Over that, on pump gas, you are playing with fire.