Boost Question

[Espo]

I have search/read about 100 past topics and am still confused?

Sorry if this is a stupid question.

I just installed turbo back system with split dump and high flow cat and found that my boost has gone from just over half on the stock guage to just under the full 7 which from what I have read I estimate to be around 12 psi. The car was fluttering a little in the high rev range so I guess it needs tuning which is going to happen as I am waiting for my pfc to arrive.

I thought I may be able to back the boost off with a manual boost controller so I installed it this afternoon romiving the standard soleniod and with the dail all the way down but the car is still running a similar boost and out of tune up top in the rev range.

What is controlling the boost level at the moment?

Is the actuater boost level still working but just effected by the exhaust system?

If that is the case does that mean the actuater spring need to be change for me to run a lower boost?

Trying to get my head around all this is fairly confusing.

Its my first skyline and first turbo so thanks for any help.

[paulr33]

freeing up the exhaust will reduce resistance on the system which will increase airflow and effiency, which is why you are seeing higher boost pressure, as long as it is sitting below +7 on the stock guage, more likely to be around +5ish on the stock guage then its ok and get a new ecu as soon as you can. you can't dial it down to less boost than the actuator unfortunately

[Espo]

Thanks Paul.

I did pick up on that in my searching but I didn't expect boost to go so high. I was only planning to have it boosted to twelve when it was being tuned.

[paulr33]

yeah it does sounds a bit high, have you been fiddling with anything else?

[Espo]

no nothing else, I better just drive it quietly until then.