People with auto trans and BNR tune. I have a question.

[dtbrown]

Anyone else experiencing this? Been working on dialing in the throttle % with BNR tune and medium level throttle input while in boost I'm getting a very hard blow off from the diverter valve while still on the throttle but just backed off a bit. Doesn't happen at WOT just during medium acceleration while in boost. Doesn't happen all the time but when it does it's almost violent how hard it blows off the boost to the point while car jerks.

Also I'm getting TPS error p0121 but not exactly when this happens. So I'm assuming it's tune related as I have other tunes with less throttle input to comprable boost output with no issues. Any feedback is appreciated.

 

[Klisman]

P0121 sounds completely unrelated to what I'm about to ask but have you bypassed the BPV solenoid? I too have had an issue with blow off but this came after the bypass mod. I

 

[dtbrown]

P0121 sounds completely unrelated to what I'm about to ask but have you bypassed the BPV solenoid? I too have had an issue with blow off but this came after the bypass mod. I

Thanks for chiming in. Still running stock bypass setup. Been driving it more and think it's because of the amount of boost per throttle input %. I'm doing data logs to send in and will ask to take an extra 10% out of it. Hoping that'll take care of the issue.

 

[kennyg23]

I am having the same issue with my auto trans. i have bypassed the bypass, forge blow off (green spring)
but... i have a cel for p0171 right now and 5 pending codes p0121, p0238, p1101, p2227, p2261. this car is a nightmare for me and has been the whole time i have owned it. i have replaced the maf sensor the bypass valve solenoid and the waste-gate solenoid. and the upstream o2 sensor with no correction of the issues. let me know if you end up finding a solution.

BNR tuned
BNR 60# fuel injectors
BNR waste-gate
BNR LS7 Coil upgrade
BNR Throttle body Spacer
BNR cat-less down pipe
muffler delete/resonator delete
Racer x ported intake manifold (with pvc fix)
Spectre CAI
DDM works Silicone Charge pipes
Forge Blow off Valve (green spring)
Bypass the bypass

 

[SuperS13]

Are these turbo 1.4L engines with Auto trans? with boost creep/Bov bypass issues?

 

[SuperS13]

Just to let y'all know if your running boost on either a 6T30 or 6T40 6spd auto trans the 6T30 auto can handle 200hp and the 6T40 auto is 225hp anymore the clutch packs will slowly blow 2 smithereens. The 1.4L turbos are great with M42 6spd manual transmission which can handle 375-400hp. Anyways sounds like boost creep issue since your running bolt on mods and a hot tune with the stock bypass valve. The P0121 tps code is the ecu backing off the throttle because your getting boost creep from the stock bypass valve . I'd recommend a Zzp or bnr forged bov. How much boost are you running from Jerry's bnr tune? Did you send a parts list of what you have installed and what is stock to jerry at bnr? The stock bypass valve can only handle 12.5 psi boost before you run into boost creep issues (2 much boost pressure on back of diaphragm and cant open to release boost pressure and causes strain on intake side of turbine)