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Old 10-13-2022, 06:39 PM   #21 (permalink)
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Quote:
Originally Posted by Ecky View Post
Fuel pressure is a good bet. It's tuned for around 50psi. If you wanted to do a 5-10 minute drive with logging running and send it to me, I'd be happy to push some tweaks and we can see how it does.
I'm using a stock RSX fuel sending unit, which is supposed to produce 47-53 PSI according to a quick Google search, so the fuel pressure shouldn't be off enough to cause this much of a problem. Driving with that tune for 5-10 minutes wouldn't really be possible because it's almost impossible to keep running and might not run at all once the engine is hot. It stalled about 5 times in the maybe 1/4-1/2 mile I drove it in my neighborhood and seemed to get harder and harder to restart every time, so I didn't even try to pull out onto the highway and get it up to speed.

Maybe the problem has something to do with my engine still having the stock cam gear? Looking at the low speed cam angle tables it doesn't look like the cam should have been trying to advance beyond 25 degrees in the short time I was driving it, but it seems like that's the only other significant difference between our engine setups.

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Old 10-13-2022, 06:41 PM   #22 (permalink)
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Originally Posted by EcoCivic View Post
I'm using a stock RSX fuel sending unit, which is supposed to produce 47-53 PSI according to a quick Google search, so the fuel pressure shouldn't be off enough to cause this much of a problem. Driving with that tune for 5-10 minutes wouldn't really be possible because it's almost impossible to keep running and might not run at all once the engine is hot. It stalled about 5 times in the maybe 1/4-1/2 mile I drove it in my neighborhood and seemed to get harder and harder to restart every time, so I didn't even try to pull out onto the highway and get it up to speed.

Maybe the problem has something to do with my engine still having the stock cam gear? Looking at the low speed cam angle tables it doesn't look like the cam should have been trying to advance beyond 25 degrees in the short time I was driving it, but it seems like that's the only other significant difference between our engine setups.
The cam gear shouldn't be a problem, it just won't use the tables if it can't advance it any farther.

I'll whip up a few changes this evening and send you a variation you can try, with a higher idle and some fueling changes.
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Old 10-13-2022, 07:51 PM   #23 (permalink)
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Originally Posted by Ecky View Post
The cam gear shouldn't be a problem, it just won't use the tables if it can't advance it any farther.

I'll whip up a few changes this evening and send you a variation you can try, with a higher idle and some fueling changes.
Good to know. Since this is my first aftermarket ECU setup, I wasn't sure what would happen if the cam timing table went over 25 degrees.

Cool, thanks. I don't think the idle speed is the problem since it's set higher than what I set my base map to and it runs bad even above idle. Something with the fuel could definitely be a problem, but I'd have to get an exhaust and o2 sensor before I could do any fuel tuning. That will probably be my next project, I just need to figure out which header will work for my setup.

Edit: Does your K24 still have the thermostatically actuated air bypass valve on the intake manifold? I removed mine since I broke it shortly after buying the engine and it seems to be unnecessary from the research I did. Since that valve closes completely at somewhere around 170 degrees coolant temp and I only got up to 130-140 degrees on my brief test drive, that may be a factor during warmup if yours was tuned with that valve in place.


Last edited by EcoCivic; 10-13-2022 at 08:00 PM..
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