Slows2k

Kane, the PCM still "thinks" it's a 2.0L. The fuel requirements at idle won't be that much different between the 2. Considering the previous 440cc equipped car ( with no other engine management) would throw a P0172 at idle, It's a very good probability the 2.5 liter will too.

It doesn't really matter, as this engine will be run with the EMS in the end.

honda9krpm

CEL and running lean will not harm your engine per se. They are only there to stress you Juan. It's detonation that will harm your engine. Since your car is NA and you have not put it under much load during the break in, you might be safe.

Just hook up the AEM EMS and the injectors. Get the car to start, idle and wait for Sean. Just a tip, tune the idle with your ear not what you see on the AF gauge.

white_S2000@16

The 440cc on this motor will not run that rich it will run safely rich, as opossed to the way you are running now which is pretty dnagerously lean.I half to say the fuel requirements are completely different between the 2 i have run my motor on 575cc injectors wiht aboslutely NO TUNE ie straight off the stock ECU. which as it sounds quite crazy provides a very smooth A/F @ WOT. dont recomend trying it on the street though, as partial throttle driving will be VERY shitty. I do agree it will work out in the end with EMS. But with my experience the most critical time of this motor is the break in and i would have never broken it in with the stock injectors and the crappy AEM FPR.(i don't like AEM's FPR maybe its a personal thing??). I really am looking foward to see Juans reaction to the 2.5L when he gets to use vtec its quite awsome when you get it for the first time in 1st gear when you have to TRY to keep it going straight all the FI boys knwo what im talking about but its quite different when you get it from an NA motor.

p.s what 2.5L have you tried putting 440cc's on? im not trying to be a jerk just wondering whos your working on??

-Matt

S2000_Europe

THe break in process is finised I made 1000 km and 2 oil changes.

I am waiting for the 440 cc injectors to install it so Sean would have everything ready, we only have 15 hours to tune de car from 7:00 pm to 3:00 of the next day then ha has to leave to Germany.

While runnig the SC I put 550cc and stock ECU and got CEL in less than a minute. My car was smoking like a truck. I got pull away by the police because the smoke made by the S.


en the 18th Will post the results, hope to be very close to 300 Hp to the crank.



What I want ot know is which is the RPM limit? 8.000 or 7.500? bear in mind that we go at very high speed on motorways for long periods and I want ot know which is the limit.


Thanks to all for your inputs

Juan

Slows2k

I used to run 440's and a e-manage on a supercharged car. I know from first hand experience what 440's with a stock PCM will do at idle.

Kane also ran his car on 440's without the emanage to check the electrical connections. CEL is minutes, just from letting it idle.

Chances are I've worked on more cars than you have seen.

kane.s2k

I got a CEL for too rich before the fan ever turned on during a hot summer day. Running extremely rich during idle is really nothing good. Another 2.0L I worked on just got the 440cc injectors put in and then started without any injector correction on the e-manage. CEL in about 2 minutes also. A .5L increase in displacement is a lot so it MIGHT be ok and not run as rich as a 2.0L. I personally would definately not run the car until it got tuned to something safe. Low load or not, minute pinging still creates a lot of uncessary stress. Just leave the car for a few days (if you can)...or just drive on down-hills

honda9krpm

15 hours are pleny of time to tune the car.
It's not like brain surgery you know
Don't worry too much Juan......it will get there, just be patience

ultimate lurker

I may have missed it, but I believe that these are RC 440cc injectors, correct? If so, I don't think he'll have any issues for a couple reasons.

1) His engine is 25% bigger than stock. Stock injectors are 360cc, and 25% bigger would be 450cc.

2) RC440 injectors don't have the same response curve as a stock S2000 injector. They need a higher pulsewidth at small injector times to deliver a set amount of fuel than a stock injector.

I suspect that slapping the 440's in a 2.5 liter setup, even on the stock ECU, would result in relatively small correction factors at the ECU (about 10-12% I'd guess - well within standard operating specs).

If using the increased fuel pressure approach, you'll need about 40% more fuel pressure than stock, say 70 psi with the vacuum line to the regulator pulled.

UL

white_S2000@16

S2000_Europe

Shawn

I have installed a fuel pressure guage on the fuel rail. Do I need to pull away the vaccum line while the car is runing to increase the fuel pressure???

Maybe is easier if I show you my "Picasso". THe hose that Is pointed is the vaccum line?





Thanks