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How much boost are you pushing?

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mazdamn02

Guest
Speak up MZR 2.3 DISI turbo peoples! How much PSI are you pushing?
I just got my boost gauge in thanks for jeff, jay and kind of tom but mostly jeff and jay. I find that I peak at about 19 PSI at 3000 rpm or so and it dips back to 16 PSI. Does that sound about normal for everyone? I just have a MS CAI so far...
 
mndsm

mndsm

I'M OFFENDED!
Sounds right. Judging from the dyno sheets @ LSE, the boost spikes when the car hits full throttle and the turbo spools, and then it bleeds back down.
 
A

aviateur

Guest
I used to peak at 21psi until I installed the race pipe. Now I peak at about 18psi and immediately settle to 15psi. It seems to be the same for 4th through 6th gear. Boost pressure drops off as RPMs go higher due to ECU programming.

I've read on the mazda3forums that our turbo can handle up to 15.7 psi continuously and run reliably which is why boost will peak as it spools up and then drop back to 15psi. I can try to find the info if anyone would like.

I'll also post the 4th gear boost vs RPM graph from the LSE dyno day.
 

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Jesse MS3GT

Jesse MS3GT

Querulous
aviateur said:
Let me know if you need help. I'm an expert now; ask Josh :)
Click to expand...
I really do.. Its sad lol. But I dont want to install it twice. I have the 3 gauge center dash pod, but I still need two other gauges, plus I want a car audio shop to fiberglass it and the vent piece into one... But I wont have money for that in a LONG time so i was thinking of doing what you did(steering wheel).

I just hate messing with wires, im scared shitless of shorting somethin out...
 
T

Turbotalon1g

Guest
SPike to 22, settles to 18psi

















oh yeah, thats on my talon. hahaha.
 
dmention7

dmention7

Hater
Normally, I'd spike to 8-9, then settle to about 7... but for the last few days I've been having trouble holding boost. I have to get up to around 4500-5000rpm at WOT to hit full boost, where I'd hit it at 2500-3000 before. I wonder if futzing with the BPV has something to do with it... maybe I should stick one of those spring compressers back in.
 
mndsm

mndsm

I'M OFFENDED!
Maybe, spring could be weak and letting it bleed off too quick. But it never did that before we put them in, so who knows.
 
D

Drumfreak

Guest
With my ebc turned on it spikes to about 11 and holds 7.5 to 8 in 2nd gear then 8.5 psi in 3rd and 9 psi in 4th gear. On a good day I can hold 9 to 9.5 psi in every gear. Only when the spool time is a little longer and the spike in very minimal. Thats when the car feels insane and the clutch starts slipping. And the boost holds all the way to redline always. With the ebc off it spikes to 8.5 and runs between 6 to 7.5 and sometimes 8 in 4th gear. I am taking the ebc out and selling it. Its not worth it to me to having 11+ psi spikes for 1 to 2 more psi to redline. Whats that, maybe 20 more hp?
 
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RockLobster

New Member
Damn guys, all these 20 or so PSI numbers.

20 psi and my motor would spit apex seals for my turbo to chew on like chicklets after a lead pipe to the face.

At least with mysetup it would. Ive heard of guys running 20-25 psi on a 13B rotary but, it takes some work. ;)
 
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RockLobster

New Member
Which he will do for perhaps 20-30k miles at most before he needs a rebuild. And perhaps a lot less depending on internals and tuning.
 
B

Blitzkid

Guest
gotta pay to play. ^^^

Im running 16psi currently...shooting for 25ish on c16
 
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Turbotalon1g

Guest
everyone has a friend thats doing something crazy.
i am currently running a 25psi spike settles 18psi at night it spikes to 30, highest to date is 32psi.
 
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