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hi everyone,

well, i have a situation i am hoping you guys can help me with. a couple of weeks ago my intake swallowed some water and BOOM...all of a sudden i was in the market for a new engine. i got one. i was able to find a 2002 ex engine (an upgrade from my dx non-vtec engine ). here is the deal, i sent the v-tec head to a machine shop to do some porting and milling and the possiblility of making a custome intake manifold with custom fuel rail and larger fuel injectors arose , so i decided to take it. but i have run into a snag...in order to do this i need to install a fuel regulator with a fuel return to the tank.

these are my questions:

1. will the ecu work properly with the fuel return set up or will i need an apex or some sort of fuel manegement system.

2. in earlier honda models i have noticed that when a v-tec head's exhaust ports are ported they tend to not like it. money being no object what modifications should i perform to the head for the best performance possible.

3. i plan to install a 65 mm throttle body..too big/too small ????

4. finally do those AEM bypasses really work?

i know its a lot of sh%t to ask all at once, but any input would be extemely appreciated.

 
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4. it works, but imo its pointless, but with you sucking up water, you had to of drove thru a big *** puddle, if your that worried about it, get a SRI

 
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u now have an excuse to go get a k20

 
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get a k20

 
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Guys. . .

From the sound of things, I'm quite certain he's already got the VTEC D17a. . . .

After all, he DID already send in the head for porting . . . .

 
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if you're doing this, are there other plans like a new cam? valvetrain? n/a mods, or boost? i can understand why you'd want to convert your fuel setup, but if its just because.....why do it? what are your goals out of this, just curious....

 
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You will have to do some serious modification to change from a returnless fuel system to a return fuel system. Then there is the ECU.
Good Luck

 
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i'll guessin you had a cold air intake, and thats how you sucked up the water ?? that sux bro, play it safe and get a short ram intake next time

 
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1) Are you using the EX ECU or the DX ECU? The DX ecu won't work at all because of Vtec. I would think you would need a FMU to run a return line system, but it has been done in other cars where you don't necessarily need it.

4) Yes they work, but like was said, might as well get a SRI.

 
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you must have drove through some serious water because the filter has to be completely submerged, which would be like a foot of water.... CAI's are fine, just dont drive in HUGE puddles...

 
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ive had problems with water in the intake too, never blown the engine though. if money is no object, buy a nsx zanardi edition, hahaha. seriously though, go for the k20a2. i would steer clear of any major mods like that on the d17a2 because it is a thin-walled aluminum block and you are asking for another destroyed engine.

 
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thanks for all the input...as far as for:
i plan to send my cam for a regrind and then i hope to get 75 hp of nitrous to go for a run in the mid 13's

 
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are you going to bore it, get forged high compression pistons, forged rods and a good crank, o yea your valves and spring... also you need to upgrade to a stage 3 clutch and maby a lsd

 
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can u tell us how you got the water in your intakee ?

 
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uh....drove in river?

 
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If you are using the stock fuel rail, you have to tap into the end for a return line an pressure/vacuum referenced fuel pressure regulator. You need to get all of the gas and fumes from the tank. It
s safer to just drop the tank. Tap it for a fuel line and install fuel line. Empty the fuel lines to the rail (pull pump fuse, let the engine run till it stops itself). Remove the regulator and pump unit. The regulator won't do you any good and you should just upgrade the pump anyway. Get rid of the regulator and you can change the pump to a 255lph probably. The only problem is that the stock ECU can't handle this. You need to get an engine management system. AEM's EMS is the cheapest and easiest to work with, and can control as much as you can plug. There are other's but they are super expensive like Autronic and Motec. You can call Cybernation and see what they used on the RSX to control the return, might not help you though.

Anyway, after saying all of that, you don't really need any return line or FPR to place bigger injectors into the fuel rail. You can even use the stock fuel pump if you want. There are people on this site that are turbocharged using only:
1. Bored out fuel rail to fit larger injectors
2. TPS relocation
3. Apex'i AFC or any kind of piggy-back system.


and they can keep their A/F ratios stable. Since it sounds like you are trying to go NA, it would definately work for you too... less tuning involved.

 
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Once before I got water in my engine but then I was smart enough to drain all the liquids from the engine and put new oil in it. I can tell cuz smoke was comming out of the exhuast and the vtec would sound all nasty and ish.