ne_12

alright here goes



"According to the official Mazda test procedure, boost should be as follows:

Drive to third gear with normal acceleration

Accelerate from 35 MPH at WOT until passing 4500 rpm

A slight and smooth increase in power should be felt at approximately 4500 rpm. This will be about 65 MPH..."



alright now my question, if you have added the following- dp, high flow cat, cat back, intake, resized wastegate orifice- would the 2nd turbo kick in still at 4500 or would the timing be off due to the upgrades. the reason that i am asking is that my 2nd turbo kicks in at around 5000 or so in third gear and is strong as hell so might i have a vaccum leak or is the timing off due to upgrades? i know people on this forum know a hell of a lot more than me, and if anyone with similar mods has the same characteristics or different?

Sinful7

are you running a boost controller?

9BASE3

Your transition should be at 4500 no matter what.. Unless you alter it with a PFC..



Someone correct me if I drank too much coffee..

Sinful7

unless he's running a boost controller t'd to the wastegate and precontrol.

edit: then the precontrol won't open till it feels full boost.

9BASE3

Ah yes.. Roger that!

ne_12

so chances are i may have a vaccum leak? anyone with similar setups have this problem?



i was going to hook up my profec b spec 2 this weekend but ran into the age old discussion of wastegate only or w/g and precontrol, which is the best way to plumb the b spec 2?i know alot of questions, sorry

maxcooper

Check the butterfly valve in the y-pipe. Mine was sticking and causing the transition to be late. I replaced it with one I bought used and it fixed the problem. To test, take the hose off the actuator and use pressure (or vacuum, I can't remember) to open the valve. The mechanism was sticking on mine, holding it up in the middle for a moment. It should open smoothly and quickly.



-Max

ne_12

thanks ill have to try that this weekend n ill let you guys know if anything changes

Rx7aholic

IF I remember correct at startup the rod should move I think to closing point and st shut off it return's back to open position.