Using stock fuel system on a 2.4L question

[my_gst95]

I was just wondering, is someone were to install a 2.4 setup on a stock fuel system, would there be any adverse effects? Would it run leaner, or would it be the same since the stock ecu requires x to intake, and x to output?

This doesn't really pertain to a dsm I'm using, just wondering as I'm increasing the bore of a project car I have. This car is an obd1 that has no means of a logging device like pocketlogger. So I'm not sure if I should install larger injectors to compinsate and just run extremly rich to compensate for the bigger displacement...or if it's possible to keep the stock fuel system til I can upgrade the ECU to a fully programable one.

Thanks~

 

[GVR4592]

What kind of vehicle is it? There is datalogging and tuning options for most vehicles, even if they are obd1. There are really too many variables to accurately answer your question without more information.

 

[my_gst95]

Its a 93 Impreza with a 2.2L Turbo engine swap. Originally it had a 1.8 n/a motor. I was going to use a safc with the larger injectors that came with the engine, but I couldnt find a logging device like pocketlogger. Only thing really available is ECU replacements which I don't have the money for at the moment. So I need something that'll get me by long enough to make the ECU upgrade. It seems feesable if the ecu is telling the engine to take 1.8's worth of intake, and 1.8's worth of fuel to burn, even on a bigger displacement motor, for it to expel the same amount, thus keeping fuel trims the same. If this is not the case, then I will put the 2.2L FPR and Injectors back and just try my best at safc guessing on an O2 and EGT gauge...ugh.

 

[GVR4592]

So are you using the N/A 1.8 ecu with the EJ22T? Probably not a good idea, the fuel and timing maps are going to be completely different. This thread is probably going to get closed so you are better of doing a search on http://www.nasioc.com/

 

[my_gst95]

Right thats why I didn't want to get too specific on the make/model. Since I've had many years on this board as a dsmtuner, I just thought I'd ask it in a way that would relate. But I won't get offended if it's closed (even though no where in the rules does it state that it has to be dsm-specific).

Anyway, if it remains open, my question still stays, as people i'm sure in our community have done a 2.4l swap but didn't get to upgrading their fuel or tuning mods right away. Seems like it would be the same concept since when we use the stock 2.0 ecu, it of course uses different maps/timing and we compensate via a safc or maft and logger.

I guess what I should really ask is, if the only change in a motor is it's displacement, does it cause it to run leaner if all other factors remain the same (air intake, fuel intake, timing maps)

 

[GVR4592]

The displacement isn't going to cause as much of an issue as the ecu that's tuned for an N/A application. I'm still not clear if you are using an N/A ecu, but if you are then you should just wait until you can get the proper ecu.

 

[my_gst95]

Ah sorry I should have clarified. Its the stock n/a ecu (thus the same timing maps). I don't plan on running it like this forever, nor do I plan on punching it. I only want to be able to daily drive it comfortably, until I get the upgraded ECU (Link +). Seems like it would drive smoother 'below' partial throttle if all fuel/air remains the same on the bigger motor, rather then having larger injectors on the stock n/a ecu and guessing on the safc (which probably won't be able to compensate enough since the injectors are MUCH larger).

 

[GVR4592]

It probably won't work, if it does you risk seriously damaging the engine. N/A is usually tuned for 12.5:1- 13.5:1 A/F at wot, that won't work on a turbo car. The timing maps are going to be way off for boost as well.