rotary>piston

Hey, I was considering getting a large street-port for my car (89 N/A). Does anyone know what kind-of power gains should be expected? And does it make passing emissions harder?

ChainSawOnSteroids

you should expect around 160-180 to the ground(approximate) without upgrading anything else,

but you should upgrade your fuel delivery to 720cc secondary injectors, and get a decent fuel pump from an FD or maybe even a TII, from there the power will grow, but again N/A is something you shouldnt expect GREAT power from unless you want to spen a lot of money,,,just get a TII

for that extra kick

ChainSawOnSteroids

let me correct myself,,,,not only will you need money, but youll lose all drivability with a high powered N/A, to me its of no importance as i dont care if the car yanks back and forth at cruise and idle but i drive alone so no one to appologize to(weekend car) so HIGH power+driveability=turbo

pengaru

Why would you lose all driveability on a high powered NA?



Bucking car? Sounds like tired motor/trans/diff mounts, driveline slop, and/or dead spot on TPS/misadjusted TPS ...



The only things I can think of that would make a heavily modded NA less drivable than a Turbo would be the exhaust noise, the Turbo has a muffling effect so it's a bit more tolerable when running open exhaust... emissions would be an issue for both....

vosko

you lose a little low end torque but N/A's have no torque to begin with. i personally don't think you will care once you get up in the rpm range

mazdaspeed7

Thank you.



If anyone thinks a high powered n/a isnt drivable b/c its making more power, then whoevers car that was needs to take a step back and look at what they've done wrong. There is no reason a high powered n/a will suffer drivability problems if its done right.



I do agreee about you with the exhaust noise. My car is LOUD. Time for a new exhaust...





Back to the porting. You will lose some low end, but keep your 6 ports operatoinal, and you wont think twice about it. It really is worth it.

ChainSawOnSteroids

i meant drivability as in overlap, and a bridged motor will jump while idling or cruising, is that not so? for some that would be undriveable(old people)

SpecialT

It would idle like a cammed 5L, you know the guy at the lights who's car sounds like it's gonna die. That'd be you! But after you start moving who cares!! As far as passing emmisions. . .could it get any worse!!!