I am open for suggestions on a issue I’m having, when vtec tries to engage the motor just goes into a fast stutter and never recovers until I let off the throttle..... which I do immediately of course. I’ve went through almost everything , including pulling my distributor apart and redoing all connections and wiring, and adding more than enough fuel for the vtec engagement. Everything I’ve done has not changed the results, I’m starting to think I might have a bad ECU since about 5% of the time vtec will actually engage. It almost sound like distributor cross fire. Frustrating

My oil oil pressure is above 60psi
my temp is above the required threshold for engaging
‘I installed all New vtec gaskets including the center cam girdle o ring and dial
I’ve verified all plugs are correct
software says vtec is engaging

tomorrow I’m going to remove the vtec solenoid and make sure it’s clean and also manually test it and make sure it will trigger when power is applied. It’s acting like the fuel and timing gets adjusted but the cams never lock, but since the car has engaged probably before I’m ruling out the rockers as the issue more than likely

I did a half assed video review for those that don’t want to back track through this whole thread. I’m not the best at speaking so overlook my poor choices of words

Looks like my buddy might have found my stuttering/shutdown problem. With the higher compression and large cams, come to find out I’m maxing my injectors out way early. I wasn’t even considering that since I’m 4psi lower on my boost levels and had a little more duty cycle to go before I pulled the motor. At 6000rpms my graph showed I hit 99% duty cycle and that’s when I hit the wall. My A/F was fine right up to that moment. I have a set of 2200cc injectors that should be here tomorrow and that should change everything. I disengaged vtec and found out the vtec had no bearing on the problem and sent my data logs to my buddy, he found it pretty quick thankfully, I should know for sure over the next few days if I don’t freeze first trying to do the installation

I’ve always loved this car, there is just something about it. I’ve bought and fixed up and sold multiple civic’s and CRX’s but this was my first Honda and the car that I learned everything on

I only switched to e85 today which increased the problem. I did a short tune on E85 so the swap over to the large injectors would be easier...... corn sure smells funny lol. But the car running out of fuel tells me the car is making more power already.

not sure yet, I’ve got a bad habit of keeping parts for spares

Dude amazing work! It sounds like you just need a solid tune then just enjoy this bad boy! You guys have me motivated just got a new clutch on the way for my car to get out and rip around and build my extra motor!

I’ve been running 450cc injectors for a long time, I thought I would be fine with them for my basic tuning to build some maps since I only had a 7 pound wastegate spring installed. I never guessed the higher compression and the aggressive cams would add that much fuel to be able to make the injectors run out that quick. The graph don’t lie and I’m glad b18apwr knows his stuff, my new injectors was supposed to be here Saturday but the winter storms have delayed them until tomorrow or Thursday. The tuning charts showed the injector peaking out around 80% but the data log said otherwise

yes, you would need to decrease the fuel map since the injector would be flowing more fuel per cycle due to higher pressure. The thing you need to be careful with is some injectors don’t like going above certain levels without losing its ability to atomize the fuel properly

‘most of the better injector companies usually do, 60-70 is the most common range that I see most of them say is the limit