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Old 04-18-2004, 11:14 PM   #1
scoobyimprza
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Default For those with their EGT probe in the uppipe

Alright, tonight I installed red top 280cc injectors on my EJ18T. I previously had purple top 370cc injectors. I switched because the car was so horribly rich at idle; something had to be done. Anyway, my EGT probe is in the uppipe and is very responsive. I've always been careful with my temps, which were easy to regulate on the 370cc injectors. I always took location into consideration and played it safe, assuming the temps I was getting were lower than actual temps.

When I put the 280cc's in tonight and retuned it, I couldn't keep my temps down at WOT. They went to 1400F with ease. I'm wondering if anyone has any numbers when using the uppipe to read the temps. Idle is around 600F and is very stable and smooth.

Would a higher flow pump put more fuel out or a different FPR? I'm using a stock FPR and a WRX fuel pump.

Thanks for the help,
Brent
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Old 04-18-2004, 11:43 PM   #2
lotusTT
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fuel pump by itself won't add more fuel, FPR will though. Just make sure you're pump can handle the pressure the FPR is set to.

My probe is in the uppipe, and I usually idle around 600F-700F, cruising is around 8-1100, and WOT is about 1300-1400. I'm running pretty rich though, so don't take these numbers for being completely accurate.
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Old 04-19-2004, 12:11 AM   #3
scoobyimprza
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I was idling close to 800 before, but it seems to be more stable now closer to 600. At WOT before, I was between 1200-1300. After tuning and coming home, I popped the hood and the engine bay seemed to be hotter over all.

I'm gonna put some injector cleaner in the tank and work on some other things that may actually resolve the fuel issue. If not, I'll look into a regulator. What about the lines on the fuel rail itself? Is it possible that the EJ18 rails are too small?

Brent
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Old 04-19-2004, 07:43 PM   #4
ImprezaRSX
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it's not the rails.

It's the smaller injectors. I would bet my tranny and my marriage that the extra heat is from running lean.

if you are too rich at idle, you need to fix the idle fueling without leaning out the rest of your rpm range.


what sort of engine management are you running??
You may need an RRFPR, but if you have something you can tune with you shouldn't have needed the smaller injectors in the first place.
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Old 04-20-2004, 01:17 AM   #5
scoobyimprza
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I knew I was running lean. I've fixed the fuel problem, but please refer to my other thread for part 2.
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