Boost not noticable until very high RPM

benman49

Member
:
2003 Orange MSP
Hey im pretty new to this forum and so far everyone has been very helpful. When im driving, i cant notice any boost unless im at a very high RPM and even then not so much. Does anyone know why this might be happening? Any input would be great, thanks.
 
It depends how you drive the car. Are you fairly easy on it in the lower gears and when you get into 4th or 5th you feel some boost? I typically am in boost at around 2500 and up from 2nd gear. But I am gassing it pretty hard. Do you have a boost gauge?
 
are u talkin about after 5500 rpm? mymsp leans out at 5500 and i get a "boost" of power to redline...off course when i dynoed they hear pinging so i dunno...get a boost guage
 
AutoBox said:
are u talkin about after 5500 rpm? mymsp leans out at 5500 and i get a "boost" of power to redline...off course when i dynoed they hear pinging so i dunno...get a boost guage

Were you getting pinging at stock boost in the higher rpms? Cause I do on hot days, and some people say they can boost 10-12 psi with no pinging at all...
 
you know, it actually depends on throttle position too. if it's open just a crack, they you aint gonna boost obviously. if it's like open all wide, then more injestion, more exhaust gas, more boost.
 
I dont have a boost guage yet, and it happens after 5500 rpms.. Also, i hear a rattling noise sometimes with full throttle
 
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stock boost and all..no mods besides a dtt......its the tuning...on my dyno at 5500 i go from sub-11 a/f ratio up to 13 range....but u do feel a kick of power because of the leanin fuel.....def dont stay up there long....i run shell 93 or sunoco 94 always until i can tune that bad ecu

and an thx for bring this up berman..i though i was the only one that noticed this issue
 
benman49 said:
I dont have a boost guage yet, and it happens after 5500 rpms.. Also, i hear a rattling noise sometimes with full throttle

Rattling? What kind of rattling? At high RPMs only? and only at full or near full throttle??

**this is very important**
 
i use premium gas. the rattling happens only at high rpms with full throttle or near full throttle. the rattling sounds like there is something loose like a nail that is bouncing around under my hood.
 
edit ^^^ posted @ same time


Take it in to the dealer ASAP, do NOT push the car hard at all until you do so. Tell them your car is pinging, even with premium gas.
 
but is the rattle when you shift, or during rpm climb?
if it is when you shift that could be the muffled turkey. it sounds more like a rattle with the stock airbox
 
Pinging puts ENORMOUS stress on the moving parts of an engine...ping too bad or ping too long, and a rod and or piston can shoot out of the block
 
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