P & IH & TB porting

[Aurora40]

I could easily feel it on my car. Marc H ported it and included a chip. It was noticeable the improvement, as well as how the power didn't drop at higher rpm. Stock it seemed to drop off around 6,500 or so, resulting in a natural inclination to shift. With the top end ported, I hit the limiter a lot until I got used to it.

I think having a ported top end is what made my exhaust change so noticeable too. I gained about 22whp on a Superflow just from a cat-back change. I suspect the number was that high because the exhaust was choking the porting a bit.

[Polo-1]

On my 92 Z , went from 325rwhp to 396rwhp. 100% stock to ported with headers and corsa (no head work). Night and Day difference. The power never dropped, it was still pulling at the rpm limiter. I think every Z should have this done (top end port work). They are so far off stock, and it makes the motor just pull to redline.

DO IT

[cuisinartvette]

Getting more air in is good as long as it can get out. All adds up at the end of the day.

[Locobob]

This has been discussed before:
http://www.zr1netregistry.com/forum/...hlight=porting

Will you feel the difference? everday driving = no, winding up to redline = yes.
90-92 models have more to gain from porting. Other breathing mods will complement a port job.
Personally I think every ZR-1 should have a ported intake, headers and free flowing exhaust, these mods really bring the LT-5 to life.

[XfireZ51]

Originally Posted by Locobob

This has been discussed before:
http://www.zr1netregistry.com/forum/...hlight=porting

Will you feel the difference? everday driving = no, winding up to redline = yes.
90-92 models have more to gain from porting. Other breathing mods will complement a port job.
Personally I think every ZR-1 should have a ported intake, headers and free flowing exhaust, these mods really bring the LT-5 to life.

Bob,

I'm hoping to experience this sometime in the next couple of weeks.
Been a long road so far but doing it yourself sure gives you a crash course on the LT-5. I'm certain Lgaff would concur. There are several of us doing this mod nearby and having people like Lee, and =Jeff= helps. Not to mention Pete, Al, ccmano and Don Yoakem.

[95ZR1#418]

Originally Posted by XfireZ51

Bob,

I'm hoping to experience this sometime in the next couple of weeks.
Been a long road so far but doing it yourself sure gives you a crash course on the LT-5. I'm certain Lgaff would concur. There are several of us doing this mod nearby and having people like Lee, and =Jeff= helps. Not to mention Pete, Al, ccmano and Don Yoakem.

I did mine. Allot of work to say the least, after doing one you realize that paying for it is worth the money in time alone let alone experience. You have to have many hours to kill to do it, & once you start only you are going to finish it unless your up for the humilation of carting it to a shop in pieces. But yes, you learn about LT5's and all the vacumm garbage, plenum & conections that all have to be reconnected or your right back in there. A great learning experience. Do all you can while it's apart, check all systems & clean it up....