Misfire when shifting quick or power shifting
 

My SS has a K and N SRI, catless dp, and a trifecta tune. If I shift quick from 2nd to 3rd it almost always cuts out until I let out of it. The harder you shift the worse the misfire. Normal driving is fine. Only codes I've got is P0300 from it. Any ideas?

Are u trying a no lift shift? U need to do it just right or ull get exactly what ur getting. U don't have to shift hard just fast and time it properly, u have milli seconds to complete it or it will not work. I'd advice u not to do that on tune unless u wanna buy a new tranny. If its on stock clutch it's safer, but still most guys won't recommend it. How exactly are u trying to do this shift? Explain

Welcome to the LNF.

Make sure the car is fully warm and make sure you do NLS correctly.

No power shifting

A no lift shit is a power shift. Right foot on the floor, throw clutch in, shift, let clutch out without moving your right foot. I'm not physically shifting to the point I'm trying to break the shifter off. By harder I mean faster. I'm getting the car right around 5600-5700. I can feel when the car needs to be shifted. It does it whether I NLS or just shift quick letting off and back into it but its worse NLS shifting. It didn't always do this and I've had this happen after the car had been on the road for an hour. I remember coolant temps at 189 when it done it once. It used to spin through 2nd from a 40 roll and chirp going into 3rd, now I just get the stumble.

It's in the same realm, but you have to hit it perfectly and only above 6k rpm.

Isn't PO300 random misfire? Might take a glace at your plugs just to make sure. Also I think for NLS to function correctly you have to be in competetive mode and shift at red line (could be wrong I just never try to NLS unless I'm in competetive mode)

P0300 is a random misfire. I honestly couldn't tell you the exact rpm I've been shifting but I've used the same technique for 45k miles and I've just recently started experiencing a problem. I did change the plugs not long ago. Maybe the gap isn't exactly right. I bought a set that were suppose to be pre gapped for it once before and it wouldn't run at all in boost.

As I said, it has to be above 6k rpm for NLS to work properly. How many miles?

I'd adjust technique
Check gap
What plugs are you using now?
Do you get misfires any other time?

I would def look at the gap again, doesn't take to long, should be at 32 for tuned not the stock 35

Vince has said his tune is not ment to be NLS'ed. I had the same issue when I tried. I would recommend not doing it with the tune on.

Sounds like your clutch is starting to slip because of nlsing on the tune. Also shifting below 6000rpm doesn't help the clutch or nls at all.

When your clutch slips on nls it will throw missfire codes, and also stutter/stumble. It's happened to me when my clutch started slipping so I simply don't nls on tune.

Besides, a tuned stock turbo drops power at 5500rpm, by 6000rpm it's barely above gms1. You are better off not nlsing and shifting around the 5800-6000 mark.

It does it even if I don't NLS. Any quick shift into 3rd causes a misfire. Quick shifts just gives a slight bog/stumble though. Honestly my tune seems to fall off above 6k like the car pulls out of its power band. I can get more rpm out of the stock tune which I don't really understand. No misfires any other time car runs great. I'll check plugs and watch closer to exactly what I'm doing when it does it.

Get rid of trifecta tune.

Also NLS and power shifting are similar but different.

Trifecta tune is fine, just sounds like you need to do some data logging. Has this happened since the switch from warm weather to cold?

The general consensus here is that most tuned cars have a bit of a misfire issue when you try to power shift and NLS. It's also not entirely suggested because of higher boost levels. It's a good way to rip 3rd gear apart.

ur shifting to early. shift at about 6k. don't listen to the get rid of trifecta talk, its a good tune. only people who have issues with it is the people who get an aggressive tune on stock turbo or other dumb crap. iv never had issues with mine, going on 4 years. and iv never had issues nlsing unless I didn't do it right.

I had this problem but I had bent valves. Replaced valves and problem went away. Valvetrain is garbage in these cars. springs are weak and lash adjusters are junk. I blew all these parts. Replaced all and boom! NLS perfect

That's not fair, generally the only time we see that kind of issue is if you over rev. Most of us don't take our car to redline often.

Or when people put the rev limiter to 7k or more stock. There is a reason it is where it is

Yes valvetrains that can handle an increase of power from 260 hp to 400 at the crank with a bolt on and tune are complete crap.

Go buy a mustang.

i have the same problem, im putting in 82# valve springs to see if that fixes it, i will let you know.

Lol. Maybe people are just stupid and rev to high or miss a shift. Maybe your valves were just dirty. Can't see a car even idling properly while having bent valves.

right?