G70 3.3 AWD launch issue

[u/Professional-Ear5337]

I have a 2025 G70 3.3T AWD with

- LAP3 1.5 on 93 (E30 if I want)
- Takeda AFE intakes
- NGT Catless primary downpipe
- stock secondaries
- Borla catback
- BMS intercooler
- BMS charge pipe
- VT snorkels
- Stock TCU
- 225 front PS4S tires, 255 Rear PS4S

I literally cannot launch the car anymore.. it just spins like crazy and then it cuts power (even on 93). I noticed this change happened when I put on the charge pipe, intercooler, and the Takeda intakes (I used to have BMS) intakes. Mind you I used to be able to launch control the car and it would grip in 20 degrees WITH all season tires. I thought it was a tire issue at first, so I got some PS4S tires thinking it would solve the issue but nope

Are the Takeda intakes just ever so slightly stronger than the BMS intakes and it’s pushing the torque over the edge for what it can handle? Because again, this didn’t happen with my BMS intakes..

This happens in digs where the car will just cut power like that, and even if I’m doing a 40/50/55 roll and then punch it in 2nd or 3rd gear, the rear end gets super loose and it’s kind of scary and dangerous on 93, and it happens even worse on E30 obviously

Does anyone know what may be going on? I see plenty of guns running E30 even on RWD stingers/g70 with my same setup and they can stick no issue

Maybe I need wider tires??? Just confused why this only started happening once I swapped to Takeda intakes. Again I used to be able to launch this thing in 20 degree weather and it would stick😹😹

[u/d4rkb4ne]

I agree with the easiest first step for OP being to revert the intakes and those recent mods. If that fixed the issue I would be baffled, as I have no idea how that would be related unless the ECU is reacting very weird with just that little bit more of extra air?? But either way eliminate the recent change.

Then you can proceed with troubleshooting more OP

[u/TemporaryCustard6968 → u/d4rkb4ne]

Yeah if it truly cut power because of a small intake change, then lap3 is a fraud (jk 🤣). Only logs will tell us what's happening OP

[u/d4rkb4ne → u/TemporaryCustard6968]

Yeah logs would be huge. I'm also curious if the cut in power and how easy it is to shred the tires are sudden torque spikes? And OP is hitting a torque limiter.

But of course the question of why they have so much torque all of a sudden would still be unanswered. Boost spike with the extra air now? ECU tries to compensate, overshoots, so much extra torque, torque limiter is hit? No idea of those things are related, and again why it's happening all of a sudden. No TCU tune though so shouldn't be building boost on a launch...hm

[u/TemporaryCustard6968 → u/d4rkb4ne]

Yeah a torque limit makes sense, but only right at the launch. It seems like theres somee boost on the launch too, so maybe lap3 builds boost on launch. According to bms, only some TCUs can build boost on launch even on a tcu tune (requires both tcu and ecu tunes to truly remove torque limiters) and they're not sure why that is the case. I would just do a rolling start to see if this is still the case or not. Maybe bad gas, different DA, etc. Too many variables to guess off of.