Evening folks. I have a 2014 EVO X GSR, I have 91 octane / E85 maps (but I’m always on E85 and never have switched to 91 to any reason). When I’m going about 5-10mph wether is a parking structure or my apartment complex my evo starts jerking back and forth so I give it gas to speed up some. Another issue is that on cold start the car turns on fine, but after it’s warm and I stop anywhere let’s say i have to give it gas while turning the ignition for it to start and i have to wait for the car to run. My tuner tells me it’s because i have big cams that my car jerks and i have big fuel injectors which is why i have to gas it when i turn it on for a hot start. I’ve spoken to other evo owners and they don’t see to have those two issues being the jerking and giving the car gas to start up. Any info you guys may have on what i can do or what’s causing this is a big help.

My set up Is 555 WHP 498 Torque
3071R turbo, tubular manifold, all bolt ons, bigger intercooler, 450 walbro fuel pump, 2000 cc fuel injectors. Mivec delete, GSC cams, springs, valves and retainers. Also have a catch can.

 

This can be any number of things. There are many details to your setup that could affect this. The tune is a big one, given the large injectors. The fuel pump setup could also be causing drivability issues if it is running full power or if it is over-running the FPR. So knowing your FPR and fuel return setup, your fuel pump power setup, and details on your injector tuning params would be needed for anyone to even take a guess at what's up.

 

Have you tried starting basic and just replacing the fuel relays? That's something odd that is cheap that can break that can cause weird issues - I'd rule that out if you're confident with your tune and other bits

https://www.kozmicmotorsports.com/pr...pump-relay-kit

 

I will look into these specifics. Thank you.