Backfire after tune?
 

So a friend of mine has a 09 370z AT and he pops flames like crazy when his car is warmed up and he is in sport mode (slap shift) and he shifts at like 7,500rpm he pops flames. Like big flames. Not just little spits of flames. And I was wondering how he does that when everyone on here says NA automatic can't do it. He said he didn't plan for it to happen when it does it just does. He has UpRev tune, non catted / non res test pipes, full cat backs, and stillen G3 intake. I have basically the same mods as him but I have pulleys from NST. And no tune for another month or so. I've heard my car pop before but never seen a flame. Is that something a tune can do? Where it runs a little rich? I also drive a 7AT. Mine is 2011. Only difference in our cars is I have light weight pulleys and no tune. I wanted to have a 2step map for when the car was parked to do, but was told by UpRev themselves it was not possible. If that's the case. Then how come I can get on Instagram right now and see multiple videos of just that. 7AT having their fuel cuts and restore altered to where they're popping flames. Not an actual 2 step launch control but it cuts/restores fuel to where it dumps fuel into the exhaust and 2step flames come out.

Instagram < There's a link Straight from Nismo's page. They claim its NA headers exhaust and tune. I may be a little F&F but I want my car to do that and need to tell the tuner to do so. So if anyone knows how that's achievable. I'd love to know. Thanks.

Everyone in Dubai is about pops and flames lol

Straight pipes, rich mix and retarded ignition (look up anti-lag tuning) will do that when the exhaust is hot.

I don't wanna run rich when driving since these cars already run rich and it's dangerous. Just 1 map that does that since they offer 5 different maps. I wanna have 2 step (flame pop) tune lol, race tune, stock, valet and a conservative daily driving basically just my stock map with a little tuning to help gas mileage if possible.

I have straight pipe. A non resonated cat back exhaust. I have non catted non res test pipes, Takeda stage II intake NST pulley Kit and that's about it wngine wise. I'm going to get UpRev in about a month. And have talked to one dealer that offers to try a flame popping map like one shown above. So I'm going to let him do it. He just doesn't assure it will 100% work. But I'm seeing it done. So I know it works. I just need to know what to relay to him to get him on the same page. He's obviously got an idea of how to do it. I just need to know what else to tell him.

So I got the straight pipe part down, I just need to have him tune that one map for it to run rich, and retard the ignition to where it basically cuts and restores the fuel at the right intervals to allow it to get in the hot exhaust and pop!?

I want more of a neutral flame pop like this > Instagram < instead of running rich and burning up my internals. Lol

You don't run it rich across the entire map, you only tune it rich and retard ignition when the throttle is closed at high revs ;) Fuel is generally injected for a second or so before it is cut when you lift off, that's when the popping and banging can happen. And guess how much tuners here in Dubai charge to do that and make it seem like they invented a new ECU just to do that for you.

PS: Running rich (within reason) doesn't melt anything. It's running too lean that you want to avoid because that's when EGT's sky rocket and valves start melting on a boosted car especially. You actually tune a boosted car rich to cool down combustion temps.

i have straight pipes........and my own uprev cable :stirthepot:

Video's or it never happened! haha

well here's the thing lol

i don't know if mine does it or not as is. i need to strap the gopro on it soon and go for some runs.

if not i honestly do not feel comfortable re-tuning my own car to run rich. i don't know the software enough (nor want to mess up my car) to go and play with the tune from AAM.

but i wouldn't mind throwing some flames to be honest :stirthepot:

i do need to grab a nice mic for the gopro though. my exhaust is way to loud for a gopro internal mic.

Can you not save the map from AAM and keep it as backup in case you screw up?

You'll only be adjusting a portion of the fuel and ignition tables that AAM didn't touch. The high rev - low load region. AAM (and tuners in general) only adjust low rev/load for driveability and fuel economy and then high load across the rev range for power. The high rev low load area is generally untouched.

i'm sure i could. i bought the cord and never really experimented with it out of fear :shakes head:

i didn't want to touch anything they did. especially after putting down the highest NA numbers (at the time maybe still the highest) on their dyno and then running my personal best ET the next day.

but a little backfire does sound nice.....and now the straight pipes feel like i need re-tuned honestly. low end TQ seems missing.

Here's what my power cut and ignition maps look like. It's all we do here man haha

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Well I called an UpRev tech. He said its not possible to "cut" ignition. I can only delay/retard it. He said if the car shifts at 7,500 you can run it rich from 6,500 to 7,500 and have a delayed/retard ignition and it would send most of the unburnt fuel down. It won't be as big as a complete fuel cut. But it's safe because you still have an delayed ignition and fuel cut. Fuel cut being the 7,500 rev limit obviously. That's what he told me word for word. So where your map shows "ignition cut" I can't do that :( I can only delay it so it ignites later and sends a decent amount of gas into the exhaust. But there will still be som fuel ignited. But will still allow plenty to safely enter exhaust. What software are you using to have an actual ignition cut?

I swapped out a few exhaust components a while ago and before the ECU figured out what happened, I was getting backfires surprisingly frequently. Funny how normal traffic stays the hell away from you when your car's doing that, but higschool aged kids flock to you. I take it everyone in Dubai is stuck in teenage boy racer mode? :rofl2:

Hey now I'm 20 and want pops :( guess I haven't grown out of it just yet.... But to me it just makes the car look so more aggressive and mean! I don't want one of those "flame thrower" type mods. Lol I just wanna tune it rich and delay ignition enough to get pops here and there. I hear pops with just my test pipes, but I don't think I'm getting flames. If I am they're not big or noticeable.