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Boost in second gear

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Steerfromdarear

Member
Joined
Oct 7, 2017
I've had a t3 turbo fitted and now a holset 3rd 4th ans 5th boost come in nice and early but in second gear it's very close to redline what can I do to improve this
 
Congratulations. You have a gigantic turbo on a small engine. It is performing exactly as designed.

You can...
  1. make the engine more powerful... bigger cam, larger valves, ported head.
  2. add more cylinders
  3. install a smaller turbo
  4. add nitrous oxide
  5. do nothing, sit back and enjoy the ride.
 
740atl said:
Congratulations. You have a gigantic turbo on a small engine. It is performing exactly as designed.

You can...
  1. make the engine more powerful... bigger cam, larger valves, ported head.
  2. add more cylinders
  3. install a smaller turbo
  4. add nitrous oxide
  5. do nothing, sit back and enjoy if you c
Click to expand...
You never know what people's going through in life I try to help people when I can not be useless and hurtful
 
Steerfromdarear said:
You never know what people's going through in life I try to help people when I can not be useless and hurtful
Click to expand...
Hurtful? Seriously?

You have a gigantic turbo on a small, not very powerful engine. You've learned the lesson that every 4 cylinder turbo owner (self included) has learned since they brought The Great Turbocharger down from The Mountain. Big turbo small engine=high rpm only.

My suggestions are spot on when it comes to improving your situation. Sarcastic? Sure, I grew up in the 80's... but spot-on.

You can choose NOT to be offended or hurt.

I'm going to add a #6 to that list above... build your engine with lighter internals so it can handle more than 6000rpm before the rev limiter kicks in. If your turbo lives from 4500rpm on, build your engine to be good up to 8k.... jus be sure you have the non-explody type flywheel.
 
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Steerfromdarear said:
You never know what people's going through in life I try to help people when I can not be useless and hurtful
Click to expand...
It seems to me that he answered you question in detail. Sometimes, the truth hurts. Turbos aren't magic. They have to be properly sized for the intended application/desired power band.
 
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I also found this out the hard way too, I don't have so much a spool problem but a too much volume compressor stall at 26-27psi boost. It just can't take in anymore air and it stalls the turbo.
 
Steerfromdarear said:
I've had a t3 turbo fitted and now a holset 3rd 4th ans 5th boost come in nice and early but in second gear it's very close to redline what can I do to improve this
Click to expand...
Unfortunately there are some people on this forum that do not know how turbo engines work but they like to talk shit....often its best to ignore them hehe, I will help you if I can.

This is a b230 right?
What turbocharger are you using exacly?
What cam and head are you using?
Do you have a twinscroll turbo system?
Have you pressure tested the system from turbo to intake?
Have you inspected the wastegate valve for leaks, and the the manifold it self?
Have you checked the cam timing?

BTW for people that think that big turbochargers+small engines=high boost threshold, the boost threshold for my HX40 is 3600rpm on a b23 with 531(klr t5 cam), and the transient response is almost as good as my 5cyl t5r with 19t.
 
Lol needs a safe space. Google would have covered this but I enjoyed the laugh at OPs expense, spoon feeding only please. I wish the mods would be harsher on this stuff, waste of everybodys time but at least this last moron knows how a turbo motor works, good grief. No patience for demanding ignorant puppy cocks here my bad
 
volvo240e+t said:
Unfortunately there are some people on this forum that do not know how turbo engines work but they like to talk shit....often its best to ignore them hehe, I will help you if I can.

This is a b230 right?
What turbocharger are you using exacly?
What cam and head are you using?
Do you have a twinscroll turbo system?
Have you pressure tested the system from turbo to intake?
Have you inspected the wastegate valve for leaks, and the the manifold it self?
Have you checked the cam timing?

BTW for people that think that big turbochargers+small engines=high boost threshold, the boost threshold for my HX40 is 3600rpm on a b23 with 531(klr t5 cam), and the transient response is almost as good as my 5cyl t5r with 19t.
Click to expand...

NJGreenBudd said:
Lol needs a safe space. Google would have covered this but I enjoyed the laugh at OPs expense, spoon feeding only please. I wish the mods would be harsher on this stuff, waste of everybodys time but at least this last moron knows how a turbo motor works, good grief. No patience for demanding ignorant puppy cocks here my bad
Click to expand...
Big man behind a keyboard 🤣
 
Steerfromdarear said:
I've had a t3 turbo fitted and now a holset 3rd 4th ans 5th boost come in nice and early but in second gear it's very close to redline what can I do to improve this
Click to expand...
Steerfromdarear said:
You never know what people's going through in life I try to help people when I can not be useless and hurtful
Click to expand...

Use some punctuation. Your writing is damn-near impossible to understand.
 
The engine is a system, if you just go around buying parts you think are cool you will surely end up disappointed. The easiest thing you can do is probably a smaller a/r turbine housing. Making the actual engine part of the engine make more power will also help you as previously discussed.
 
volvo240e+t said:
Unfortunately there are some people on this forum that do not know how turbo engines work but they like to talk shit....often its best to ignore them hehe, I will help you if I can.

This is a b230 right?
What turbocharger are you using exacly?
What cam and head are you using?
Do you have a twinscroll turbo system?
Have you pressure tested the system from turbo to intake?
Have you inspected the wastegate valve for leaks, and the the manifold it self?
Have you checked the cam timing?

BTW for people that think that big turbochargers+small engines=high boost threshold, the boost threshold for my HX40 is 3600rpm on a b23 with 531(klr t5 cam), and the transient response is almost as good as my 5cyl t5r with 19t.
Click to expand...
We don't think it, we know it. Large turbos on a small displacement engine = high boost threshold, period. That's why the engine build needs a plan including the goals and every component to be used has to be part of that plan.
 
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