3 inch exhaust, first impressions

Ok, I have an urge, pull the trigger and install 3” exhaust from turbo to end into my 1HZ 80 with DTS turbo.

First impression rather mixed. Actually they did very good job and even straitened a bit my exhaust by running it inside rail rather then factory outside setup.

I would not say that car start jumping from the line as V8 Commodore, but I definitely gained something. Although it does not appear that I gain much power, now it gets delivered in much smoother and easy manner.

Most noticeable is turbo behavior – before upgrade (it was 2.5” piece from turbo to flexible link and stock 2” after that) I really have to flog it to make 7+ PSI boost and it happens on 4-th or 5-th with some load like accelerating uphill. Now it came to 5-6 PSI very easy and very fast on 3-rd and on some extend on 2-nd. Cannot really judge how good is that – from one hand it obviously unleash some horses, but from another engine going to work harder from now on.

Another very subjective notice is that temperature of gases at exhaust tip appears to be a bit hotter. Again, cannot decide is it any good – probably it due to increased boost or due to bigger pipe (i.e. less area vs volume) and therefore hot gases going out without giving too much temperature to pipe. Hmmm… Probably I should stop relaying on boost and install pyro-sensor.

Now I am incredibly excited to test if it gets any influence on fuel consumption.

Conclusions? Too early. But now I have gut feelings that although original 2” setup definitely inadequate for turbo setup, 3”propably a bit overkill and it would be just nice with 2.5” and some extra dough in pocket.

Cheers
Serg