Safe boost pressure. - Alfa Romeo Forum
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(Post Link) post #1 of 9 Old 19-02-18 Thread Starter
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Safe boost pressure.

Hello everyone,
I've been searching for information about safe boost pressure of stock turbo 1.9JTD 8v but without luck. It's a GT1749v if I'm not wrong.
What is safe boost pressure for 24/7? I was wondering for 1.4bar.
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Hello,

1749v from 8v 110/115 can boost 1,2-1,3bar safe with stock exhaust at medium revs. My experience is 100.000kms with 1,27 and 70.000kms with 1,37 without issues. There are people with 1,5 or 1,6 without issues too. I probably will config 1,47 when de-precat, this because I don't want to spin turbo over 190.000 rpm sea level or 195.000 rpm in the mountain. It is "safe" limit for me.
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(Post Link) post #3 of 9 Old 20-02-18 Thread Starter
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Quote:
Originally Posted by ceecao View Post
Hello,

1749v from 8v 110/115 can boost 1,2-1,3bar safe with stock exhaust at medium revs. My experience is 100.000kms with 1,27 and 70.000kms with 1,37 without issues. There are people with 1,5 or 1,6 without issues too. I probably will config 1,47 when de-precat, this because I don't want to spin turbo over 190.000 rpm sea level or 195.000 rpm in the mountain. It is "safe" limit for me.
How much of fuel are you injecting for those values?
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83mm3 at medium-high revs.
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(Post Link) post #5 of 9 Old 20-02-18 Thread Starter
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Wow, so it seems to be lower than 14.7 AFR. Have you also adjust N75 valve? Because when I'm injecting 69mg of fuel since 1750RPM and 70mg at 2000RPM I'm getting overboost a lot (2473mbar for a while, desired one is about 2300).
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Nope, my AFR min is 16-15.5 sometimes (I said mm3, not mg).

Yep, you need to adjust N75.
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(Post Link) post #7 of 9 Old 20-02-18 Thread Starter
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Right, my mistake.
I have made something like this. What do you think? OFC check it if you want

https://mega.nz/#!1IYhzTSI!a75suMJHY...V7GNKref8lddZs
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I did see it. Looks like ok, nothing dangerous. Some notes:

- Rail desire is ~1390 bar but others rail maps-limiters are 1350. It could work irregular.
- You changed N75 sport maps only. Well, typically those don't work, you should log it or change normal-eco and transient maps.
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(Post Link) post #9 of 9 Old 21-02-18 Thread Starter
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Thank you for explanation
I will do changes on the rest of n75 maps, and I have totally forgotten about SVRL. After this I will do logs and share results
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