Boost dropping off

[TWC]

2021 Supra with 1700 miles

had the car tuned and running perfect with downpipe only and e40, decided to add an intake a couple months ago,after the fact and weird stuff seems to be happening now. It did seem a little bit slower after intake but I thought it was in my head.

datalogged my car and showed tuner, air flow is down from 1380 kh/hr to around 1200. Boost is also dropping off. I took the armaspeed intake off and put stock back on but nothing has changed on the data logs, so now I’m thinking it wasn’t t

I installed a boost logic catback a few weeks ago but I’m going to say that’s not related

the only reason I logged it was because a cel came on Sunday for the car running lean. I’ve cleared that and it hasn’t come back yet, all fuel trims are normal

I have never touched any of the boost lines or charge pipe. Any ideas what’s going on?

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[black_sedan]

wondering if your ethanol content might be off. too much ethanol and the fuel system could be maxed out for a second sending you into a limp mode and cutting boost.

 

[TWC]

wondering if your ethanol content might be off. too much ethanol and the fuel system could be maxed out for a second sending you into a limp mode and cutting boost.

So my ethanol was at e45, I took it down to 39 this morning but didn’t see any improvements, i was thinking what you were. The car is maxing out back pressure that the tuner set it to and trying to close the waste gates to make more boost, but the boost isn’t coming in. After messing with the charge pipe, my mass air flow went up from 1220 to 1270, the target is 1350 which it was easily making before I put the armaspeed on.

Tuner and another tuner are stumped and keep saying it’s a boost leak so I’ve got no idea lol. Unless there’s a tiny crack in the charge pipe for some reason or the o ring broke.

 

[MYA90SUPRA]

So my ethanol was at e45, I took it down to 39 this morning but didn’t see any improvements, i was thinking what you were. The car is maxing out back pressure that the tuner set it to and trying to close the waste gates to make more boost, but the boost isn’t coming in. After messing with the charge pipe, my mass air flow went up from 1220 to 1270, the target is 1350 which it was easily making before I put the armaspeed on.

Tuner and another tuner are stumped and keep saying it’s a boost leak so I’ve got no idea lol. Unless there’s a tiny crack in the charge pipe for some reason or the o ring broke.

Make a boost leak kit. Buy silicone coupler to fit over the intake side of the turbo get an air compressor, some fittings and Guage and pressure up your intake system and use soapy water.

 

[black_sedan]

strange, that you would be leaking boost especially when the intake only replaces the parts on the inlet side of the turbo... Looks like the charge pipe doesnt get touched.

 

[Abomb210]

Check your Intake Air Temps. You might be getting hot up top and Supra’s tend to pull boost when IATs are above a certain temperature. I had this same issue until I went back to stock intake. Once I figure a good heat shield I’ll put my MST back on. Hope this helps

 

[Abomb210]

Sorry just seen you put your stock back on. Now I’m not sure. You might have a separate issue

 

[TWC]

If anybody was wondering, my turbo fins got damaged from debris that must have gotten in when I swapped intakes. I have since put a big turbo kit on

 

[Zupra1776]

If anybody was wondering, my turbo fins got damaged from debris that must have gotten in when I swapped intakes. I have since put a big turbo kit on

Thanks for updating this. I just ordered an Armaspeed and was thinking about this exact thing when I was watching an install video, I'll likely go through everything with a shop vac before and after removal, and again during install to make sure this doesn't occur.

 

[mrd]

Did you mod before break in? lol

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