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Old 11-04-2018, 05:30 PM   #1
955IsAlive
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Join Date: Apr 2018
Location: MN
Default Avoiding Boost Spikes B5254T2 \ K24 \ Stock ECU

I have a burned valve and a worn turbo in our XC90 2.5T.
Decided **k it, I'll drop a K24 in there and get a tune. But it'll be a few weeks before I'll be able to get that done.

I want to be sure I don't send the rods out the block. From what I understand, the stock ECU map won't react quickly enough to avoid the spikes.

Would looping the pipes at the TCV to keep the turbo at wastegate pressure help?
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Old 09-03-2019, 03:21 PM   #2
955IsAlive
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Join Date: Apr 2018
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Update..... K24 appeared to be well within adaptation of stock ECU and it had no issues whatsoever managing boost with it.
I had R injectors and MAF on there and fuel trims are showing -19% or so. It's got plenty of fuel. I have about 6000 miles on it so far.

If for some reason you felt compelled, or had to for a short time, I suspect the K24 with stock MAF and injectors would be within adaptation of the ECU, even though the K24 flows a bit more at a given PSI compared to the TDO4-14T. I may validate that theory before I get it tuned.
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