Upping the boost

[chillinmcmillan]

I just got my boost gauge installed and I'm running 5 psi, I want to get a boost controller and maybe go with 8 psi just to be safe. What do you guys think, all my mods are in my sig and I always run on Sunoco Ultra 94 gas. I'm pretty sure I'll be safe but I just want to know what the experts think (you guys) Thanks!

 

[chillinmcmillan]

bump

 

[unwrittenLaw]

8psi shouldn't be a problem. but get a good boost controller, and listen for knock/pinging.

 

[Wiggles422]

being flashed i dunno if you should go much higher than 8

 

[chillinmcmillan]

I am going to go with this controller http://www.boostsciences.com/accuboost.html people on here say these guys make good stuff. I don't plan on running anything higher than 10 psi and thats only when I get some more supporting mods, but I think 8 should be ok with 94 octane, right?

 

[ChiMSP]

I went w/ a Joe P. MBC, it works just fine and its alot cheaper. I think you can run up to 9 psi w/o getting any fuel cut. If you're gonna boosting more you should get a Fuel cut deffenser and fuel press. reducer.

 

[Wiggles422]

Yeah supporting mods would make it much safer to boost more.

 

[Glowmunkey]

I'd get copper plugs, FCD and run 8 with no fear. Fuel pressure reducer is questionable on a flashed car, especially when upping the boost. Can anyone that's datalogged a flashed car with fuel pressure reducer chime in?

 

[irr5302]

Not put a FPR
8psi is safe

 

[jersey_emt]

You shouldn't need an FCD to run 8psi.

My car is running at 8.7-8.9psi without any boost controller (8psi with no mods, SMIC and hardpipes raised it a bit)

 

[03MSP]

You should be fine with that setup, some people run almost that stock, with no boost controller.

I am flashed and I run 10psi...on 92 octane, no pinging, no cut. My theory (be it an uneducated one) is that if you are running under the flow that spark cut hits, then you are in the area that Mazda deemed safe.

 

[StreakinOraNgeX]

with 94 octane, you should be plenty safe, possibly even moreso. I have only 91 octane here in cali and a higher knock resistance gas....will do what its supposed to do, especially with a conservative 8 psi boost.

 

[Spooled]

with 94 octane, you should be plenty safe, possibly even moreso. I have only 91 octane here in cali and a higher knock resistance gas....will do what its supposed to do, especially with a conservative 8 psi boost.

I don't understand. 91 octane has a higher resistance to knocking (it doesn't)? Or is there something in the gas that helps without raising the octane?

 

[DragonSpeed]

i have the accuboost mbc too with basically same setup as you and i'm running 9psi, sometimes spiking to 10psi, for about 2 weeks now with no problems. I use my msp as my daily too and haven't had any issues. I'm also flashed with injen cai, so i'd say you'll be pretty safe doing 9.

*sigh* it was kinda shameful when i told my car club buddies i got my mbc and they asked how many psi i'm pushing now, i was like "9..." and they laffed their asses off oh well, little do they know that 9psi is actually a big jump from 5, my car pulls much harder than it did at 5.

Anyhow, gl to you.

 

[Puckpimp71]

Let your Turbo breathe before putting more air in it... supporting mods are your friend. I know 8psi isn't much, but it's still higher than the 5 your car is used to. I'd at least open the exhaust a bit and get colder plugs as a precaution.

 

[chillinmcmillan]

ya I plan on going up to 6 psi for a week or so, then to 7 then to 8, not sure if doing that is going to make any difference but what the hell

 

[Glowmunkey]

You shouldn't need an FCD to run 8psi.

My car is running at 8.7-8.9psi without any boost controller (8psi with no mods, SMIC and hardpipes raised it a bit)

I used to hit the fuel cut at 8 psi in cold weather... I've heard of others having this issue as well.

 

[zzooomm]

People running 8 psi on pumped gas on mazdaspeed rods are bending them into a cresent moon shape. in cylinder number 4. Many Many have been to the dealer for rod replacements. $65 can cost you $4000 to $6000 if you arent careful. If you want more boost, at least upgrade the rods. Just keep that in the back of your mind. I just got my car running after three months. Total cost for block, gerdle, crank, pistons, rods, head work to fix bent valves, bearings $3800.00 No labor included Engine blew at 8 psi leaving the line normal, no racing.

 

[chillinmcmillan]

now in terms of taking the MBC off when going to the dealership, how easy is that? Can they tell that one has been on there if I take it off before I go?

 

[zzooomm]

They look for the glue line to be broken on the tee where it goes to the wastegate. They can also pull the amounto of boost that the car is running from the computer, so always clear the computer before taking it to mazda.