mikejenkins

It's time to change belts... is it okay to take the airpump off If I already took off my cats and replaced them with 3" pipes for both the down and mid.

FormerPorscheGuy

Yes, you can remove your airpump if you have a mid pipe.

wanarace74

ahhhhh if you are going to remove the stock cat and install a mid pipe, u MUST replace the stock ecu with a pettit or and other aftermarket. no bakc pressure when the computer expects it is bad bad bad...! you will have aboost spike and plow your rear seal.. just a little fyi for ya.

Sesshoumaru

iTrader: (1)

just watch your boost.

if you keep it stock your fine (which is the hard part).

mikejenkins

Thanks fellas... just got the POWER FC ECU and commander installed along with a boost control kit for the PFC... Gutted the exhaust and intakes... Ready to go prime time... just need tuning help now... Please check out my other thread titled "Power FC not talking to Boost control Kit". Thanks for the input again!

JONSKI

If you have an aftermarket ECU, open exhaust and never need to worry about passing smog tests, then by all means eliminate the airpump. You can also eliminate the ACV, EGR, their solenoids, and some pipes and hoses that are rendered useless without the airpump (of course some might argue that they were useless even from the factory).

Ghostrider7

so you can't put on a pulley kit unless you have a down pipe and midpipe or you will get boost spikes?

JONSKI

You don't need a pulley kit to eliminate the airpump.

Boost spikes are caused by overloading the wastegate (i.e. opening the exhaust and intake too much). You combat boost spikes by porting the wastegate or restricting the exhaust.

rynberg

And what's the point of installing a pulley kit on a close to stock car? God, what a waste of money....

mikejenkins

Thanks for the inputs fellas. Appreciate them... once I get my underboost problem figured out now I should be all set!

1st to 3rd

To reduce pump cavitation. Granted, this only applies to a very limited number of owners but ya asked.

rynberg

Which only happens above 7k rpm......this is never a problem except in a "road race" type of track event.....and I've never seen anyone post anything comparing coolant temps at the track pre/post underdrive pulley install.

mikejenkins

can't we all just get along?

David Beale

Well, according to the Mazdacomp catalogue, above 6000 RPM (but who's counting - when I'm up there I usually don't have time to watch gauges anyway).

mikejenkins

Just got the Greddy pulley kit... It takes about 30 minutes to install (Including the front belt as well) It took me an hour from start to finish because I had to run to discount auto parts to get the front belt. It does come with a belt that is only big enough to take out the air pump. sO if anyone gets it and the want to keep the pump they will have to get two belts for replacement. It also comes with japanese directions (easy to follow from the pictures though). This was the easiest evolution I've ever done on my RX-7. Finally a mod that isn't a pain in the a-s!

mikejenkins

I must say that there is a noticeable difference with the pulley kit installed! It is awesome!