Boost dropping in third

[striker_29]

I have my boost set to ~20-21 lbs and it spools up quickly to that in first and second gear, but about the time it hits third gear, It looses 5 lbs and drops to about 15 lbs. Obviuosly thats hurting me a lot on the big end, so I'm trying to find out whats going on there. Anybody got any ideas on what might be causing this?? TIA...Mark

 

[BM Computer Src]

If its a street chip thats normal. Race chips or alky chips typically do not reduce Wastegate DC in 3rd and 4th, but street chips do. Its to keep you from detonating with the increased load in 3rd and 4th gears.

 

[striker_29]

Well, its an Alky chip by J Testa. I just went back to a THDP and adj WG, from an ATR/Deltagate setup that I had. With the delta gate it was just the opposite, with a bunch of lag, but steadily climbing, especially in third. This was with the same chip, so Im just not sure whats going on.

 

[Scott231]

Originally posted by striker_29
Well, its an Alky chip by J Testa. I just went back to a THDP and adj WG, from an ATR/Deltagate setup that I had. With the delta gate it was just the opposite, with a bunch of lag, but steadily climbing, especially in third. This was with the same chip, so Im just not sure whats going on.

That's some pretty serious Apples to Oranges comparison comments there!

With a Deltagate, you don't use the ECM to control boost (assuming you hooked up both ports correctly). Now you are using the ECM with factory solenoid. Sounds like the chip is doing its job with a 75% boost reduction in third IF that is what Jim put on the chip. You could also be detonating and the computer is scaling back the boost as per the chips safety parameters.

So let's find the answer....what does your scan tool provide for data when this happens?

 

[striker_29]

Ok, I dont know if Jim put that in the alky chip or not. I can get some ds readings this evening, but my caspers knock gauge is not showing any knock at all while this is happening, so I dont think the ecm is pulling timing