got a question and hope someone can answer...

i have a 2.3 vtec prelude.. and wanted to know if it is possible to put the dsm 450cc injectors in with the vafc hack non turbo, the stock flowrate is 340cc to 345cc so i would be only 110cc or 115cc over stock.. an with the vafc i could lean it out alil bit.. so if anyone knows what im trying to get at our have done this.. please let me know.. thanx

 

You have a 2.3 Prelude? Is it the Jap. one from the Accord wagon, or just a head swap? W/ the numbers you gave, it sounds like you're using the JDM H22 injectors, which flow something like 340cc. I have a somewhat good grasp on how the VAFC hack works, so tell me if this is wrong:

The VAFC lets you tune down the flow rate by up to 40%. If you're using 340cc's, and wanna use 450's, tuning the 450's down 40% will put you about 270cc, so you could set the 450's to the stock injectors' flow rate.

 

some people think the h23 is vtec for some reason.. anyway h23 (prelude si motor) has i think 240cc and 92-96 vtec i think has 340 or 310cc.. anway i dont really give a **** but u have VAFC hack about anything

 

no.. its a head swap.. i took my block from a 93 and the head from a 98 prelude.. which in 98 they did a mid port and polish.. its not much.. but better than the ones in 95 and 96..

do you have a vafc.. cause i havnt gotten it yet.. its on its way got one off ebay, like i was asking so if i use the 450cc injectors and tune the flow down to 350cc er so.. or how high of a flow can i have without damaging my car is a question i hope i can get answered.. cause right now im using the prelude si injectors cause i have nothing else which is 240cc and its suck LEAN like crazy.. would the 450cc be way to rich since the stock is 110cc lower? or could it be alright?
im tempted to try it.. but fear to damage the car since im short for cash

if you got any info or know anyone that might be able to help me out.. id apprieciate it.. thanx

PreLude 2.3 Vtec hybrid

 

I think it should work out fine; but I don't see how your car could be harmed by running too rich, so if it doesn't work great, you don't have to worry about anything blowing. You may foul a set of plugs, but that's it.

 

Are you using the 5g H22 ECU or the H23 ECU? You need to use the H22 ECU, preferably OBD1, take the car to a dyno with wide-band O2 sensor, and dyno-tune with VAFC to get the air / fuel mixtures right (and safe). I'm not sure if the DSM injectors will work, but if I had to guess, they should with tuning. It will probably run too rich, even with the VAFC if you're still using the Si ECU.

 

what?! No offense, but you obviously have no clue what you're talking about...
If you mean he can't use a VAFC on an H23, you're right; that means he should use the SAFC, not switch out the freakin ecu's! Jeez, now THAT would not work! You should be able to use the 450's and tune them down and it should work great.

Oh, and Wannabe, how do you like that Phantomgrip LSD? I always wondered how well they worked on the prelude

 

Maybe I'm just dumb, but my understanding of the SAFC/VAFC hack was that it allowed the reading of boost on the stock MAP sensor w/o throwing a code.
How would it work to make a NA car idle (let alone not drive ultra-rich) with super large injectors?

 

oh. no.. i have a prelude si, but when i did the head swap..the ecu was swapped with a 93-95 prelude vtec ecu, the si ecu will not turn the vtec on, it doesnt have the wiring and chips for it its a must as if i was changing the whole engine from a h23 to a h22 you change the ecu,

i have a vtec head on a si block and with the vtec ecu so that way its kick the vtec on, only problem dont have the prelude vtec injectors which are 340cc/min, so im running lean cause the si injectors are 240cc/min

 

oh, and my bad about that last post of mine; i was at work and didn't pay attention to the fact that you said it was a head swap yeah, the H22's ecu is what you would use; Sorry!

 

just to through this out there, couldnt he use the H22 injectors and use the VAFC to increase the fuel flow especially if he isn't going boost. Thats what I did on my 90 lude with boost only I used the SAFC cause it was running really lean at 100% throttle so I added fuel at hi throttle rpms above 2,000.

 

Hey tofu2.3

how long have u had the 2.3 vtec motor. how was the reliability. Im considering doin the same thing but im having reliability issues.

 

getting pretty close to a year.. and believe me.. i drive hard.. im very hard on my car cause thats what i like.. i need a car that can handle the *** beating ill give it.. and i havnt had a problem yet.. its worth doing the head swap.. need pointers email