Originally Posted by
Canada1
Hello karlos,
At what rpm was the boost surging?
With the electronic boost controller you should be able to tailor the boost curve
vs. RPM.
You should be able to plot your engine airflow demand on the 60 trim compressor map you posted.
Also take a look at this turbo calculator:
http://www.squirrelpf.com/turbocalc/index.php
It is quite good.
I input a 1.6 engine, and 250 hp, and .55 bsfc, and 1 psi intercooler boost loss.
I also mapped the 60 trim T3 with these parameters.
It looks like 4000 rpm before you can be at full boost (over 18 psi)
Cheers
It is surging from 4000rpm which is where is where it was making 21psi.
Originally Posted by
crazycage
give it more pre load mate
I will try mate!
Originally Posted by
Rob_DOHC
Looking good Karlos, sounds like a headfuck to me but im glad you got it fitted.
Have you given you boost controller a re-set... is it self learning? could it be interfering etc.?
Rob.
Yeah I have adjusted it, started at a bar and worked up, dont use the self learning function.
Originally Posted by
Karl
Hello,
A 60 trim compressor wheel and basic 1600cc engine generally surge above about 18 psi. The correct compressor wheel for that spec engine on a 0.48 turbine is preferably a 50 trim if you want a BIG mid range boost spike without surge, or a 55 trim for a recommended held 22psi. The 60 trim compressor wheel is I'm affraid a very poor wheel in general.
The only other option is to use a different cam, but assuming everything else is correct, essentially you've got the wrong spec turbo!
Ah thats interesting Karl!
The engine is a stock CR 1600cc with forged internals, you worked my head for me (stock valve size, but stainless with bronze guides), a newmans off the shelf RST cam and lifters, stock valve springs, and stock manifolds but I have a custom inlet on it's way!