Thread: raised the boost to 12.5 lbs and now im missfiring?

I mean either way though bored out or not he is still pushing the limits of it and coming dang close, i mean he could start with the basics like the plugs, but it seems like he doesnt know his setup very well, i mean do you have an afpr, i would assume because he mentioned the jwt ecu for 370's at 4bar but you can run a 4 bar setup at 3 bar easily without problems. i ran my calum 4bar program at 3 bar for a couple days at 10psi boost until my afpr came in and even wot had no detonation.

We could use more specifics of the setup. but i wouldnt trust even a bored stock maf to go much over 250whp its still cutting it close. I would say your fuel and maf setup is limiting you right now and would suggest upgrading.

hahah i know my set up, just ask the questions, just because i didnt know my gap plug off the bat doesnt mean i dont know my set up. my gap plug was .30 so i left it at that. I figured i was either maxing out the injectors or the maf, but just wasnt sure, i didnt think i was that close to 290 until i searched some other threads and saw someone with 300whp trapping 1mph higher than i am now.

hope you have a 255 fuel pump and check for boost leakes i had the same issue now im runing 18 psi .

I'd close the gap a bit and see what happens first. Its so easy. I bet Ashton has your issue pegged though.


What does your last Dyno look like ?

Um, not to state the obvious here, but maybe another coil might sort it? I had the same coil on my turbo engine for ages, and it wouldnt hold ignition with boost over 14psi, grabbed a random coil from my spares pile, and 22psi no probs. ANY sr20 coil will do, they are very good coils when they go, no need for flash aftermarket stuff, but once its gone, misfires are for sure.

yeah could be the coil. i run my plugs gapped to .32 and 19psi spike and i get no misfires during that spike, crazy amounts of power and torque, then holds 12psi easily to redline no misfires. btw i solved my first gear hesitation/misfire problem, my maf had a pretty decent leak on the circuit board cover on top of the z32 maf. JB welded the crap out of it and the car is sooooo much smoother. Partial throttle hesitation and missfire is gone also, also moved my bov into my fenderwell away from my maf. pretty much solved it.

I checked all the easy stuff like leaks, never though of the coil, but i figured if it was the coil it would do it at 11psi also. Yes I also have a 255 walboro. I'm just going to start going with a bigger set up, I wouldnt be doing this because I HAD the fastest car out of my freinds until my body started throwing a 100 shot at his mach 1, another freind picked up a turbo civic hatch at 16psi(260whp but his car weighs like 2100lbs) and another freind is supercharging his prelude. So now i gotta go bigger lol

If you are running 111mph then you are making somewhere around 260-270whp. The bored MAF, 370's @ 4 bar is only good for 280 and thats maxing it out. I would just leave it @ 11psi until you get A)bigger injectors and B)bigger MAF. I ran 12.9 @ 111mph on street tires and was making around 260-280whp at the time. Your setup without cams is around 250whp, the s4's are giving you about 20-25 more. Get you some 555's and z32 maf, turn it up to 18lbs and you will make 350 easy.

Thats exactly my plan, well not 18lbs haha, i thought the t28 lost its effiency that high?

My boy has a GTi-R swapped classic, stock T28 and he made 330 WHP on it. Hit him up if you want, DxPxE