building boost at what RPM

[MAZDA_SPEED]

Driving around the msp. and I notice it pulls harder after 4,000 RPM. no boost controller, all stock except a FMIC. and It also builds boost after 3,500 rpm.
which is why im writing this. is this correct? building boost after 3,500 rpm?

 

[harrisonchang]

bone stock, mine pulled around 3-3.5
after light mods, pulls around 3.

I would say that's normal.

 

[Rush]

It all depends on what you have done.

With all my mods, mine tended to build boost earlier -- basically from the second I 'got on it' until about 3700RPM. Then the boost would hold somewhat steady till about 5000RPM, then crash.

 

[MSP4G63]

Since I bought the car stock 7-7.5 psi at 2000rpm but no power lol kicks in hard after 3500 and holds all the way to rev limiter 7200rpm without slowing down or falling on its face.

 

[MAZDA_SPEED]

I see. So, something isnt wrong with the car. I havent had time to drive the msp, so i couldnt tell if there was a change. Thanks.

 

[Mazdaspeed2oo35]

Stock MSPs Build boost at 2500 Rpm, but considering you have a FMIC That makes it boost later do to the amount of Core and piping the turbo have to fill. Id say you should be making boost at around 3000-3200 Rpm not more than that..

 

[StealthWyvern]

Stock MSPs Build boost at 2500 Rpm, but considering you have a FMIC That makes it boost later do to the amount of Core and piping the turbo have to fill. Id say you should be making boost at around 3000-3200 Rpm not more than that..

hm... and here I thought my boost issue was just due to the big fmic of the perrin. I dont build full boost tell about 4-4.5k

 

[Mazdaspeed2oo35]

hm... and here I thought my boost issue was just due to the big fmic of the perrin. I dont build full boost tell about 4-4.5k

Thats ******* insane Daniel.. Not even my 35R turbo takes that long with a FMIC in it.. you should check your ride out cause there is something really wrong with it.. Having a FMIC makes you drop the preassure and you loose some PSI and gets a little laggy, but not near those Numbers of yours.. 4-4.5 K rpm is just wrong...you should check the duty cycle setup for the boost selenoid of the Greddy E-01, i know if you dont have that setup right that s*** will be so laggy is not even funny, thats why until i find out how to damn set mine up im using MBC, with it the boost is insanely responsive almost no lag, and i mean no lag at all, but with the greddy s*** takes so long to build boost

 

[StealthWyvern]

Thats ******* insane Daniel.. Not even my 35R turbo takes that long with a FMIC in it.. you should check your ride out cause there is something really wrong with it.. Having a FMIC makes you drop the preassure and you loose some PSI and gets a little laggy, but not near those Numbers of yours.. 4-4.5 K rpm is just wrong...you should check the duty cycle setup for the boost selenoid of the Greddy E-01, i know if you dont have that setup right that s*** will be so laggy is not even funny, thats why until i find out how to damn set mine up im using MBC, with it the boost is insanely responsive almost no lag, and i mean no lag at all, but with the greddy s*** takes so long to build boost

Stock boost on stock pcm..... I've read other people getting the same results with the turbolife fmic as well.

Edit: I know I need to do a boost leak test but for right now my boost holds steady and my needle doesnt flutter like a typical boost leak causes. I just haven't had the time to do one yet.


Edit: I want to downgrade my current FMIC to something a tab smaller and put a crash bar back in this thing.

 

[Ricktalife]

from what i remember, with the stock turbo manifold the power would die out around 5-5.5k but with the steedspeed manifold it seems to hold its power till redline.

 

[MSP4G63]

I must have a freak because even with the stock manifold mine would pull all the way to 7200rpm, and no putting a front mount on your car will not increase boost lag to where you can feel it or for it to even show up on the dyno. The increased time for the turbo to fill up the space in the longer piping and the front mount if I remember correctly from a test they did on a DSM forum I used to hang out at was less then 0.1 seconds and there kit had longer piping and a bigger core then the perrin/turbolife. If your car isn't building boost at around 2000rpm with a T25 then something is wrong with your car even second gen DSM's came with regular T25 not dual ball bearing, even SR20's and they all build boost at 2000rpm there's no power but the boost should still build up that fast.

 

[MAZDA_SPEED]

I see, so at 2000 rpm i should start seeing boost. I have a boost gauge, and i only see boost after 3500-4000 rpm..so help me out here. what should i look for? oh and I can only here the turbo spool around the same rpm.

 

[Metallic36]

Mine starts at 3K with the FMIC, but continues to build after that. I'd say maybe around 2K-2.5K with complete stock setup for boost.