My car has exhaust depot intake, solo street race exhaust, hks bov, and a bypassed stock "bov". Both before and after mods it always hit 17psi and sometimes 18 briefly. The other day I noticed it just will not go above 14psi anymore, even if I keep the pedal mashed to the floor. Any ideas as to why this is?
__________________ GXP Mysterious darkside l ebony leather with red
headliner l sport pedals l A/C l single disc Monsoon XM l chrome l no spoiler, onstar, smokers, or mayo
Ferrari F430/612 Scaglietti - Alfa Romeo 8C - Porche 911 Turbo - Lambo Gallardo Superleggera - Aston Martin Vanquish S/DB9/Vantage - Merc SL 65/SLK 55 - Tesla Roadster - Vette Z06 - Lotus Elise - Infiniti G35 6MT - BMW M3/3 series - classics - Chevy Nova - Camaro - Vette - Dodge Challenger - Pontiac GTO
yea i checked all the hoses. not sure what nut i'm supposed to check. I've never gotten in the 20s ever. But I know boost among owners seems to vary even on stock cars from about 17 to 24. i've never had over 18 but i've also never topped out at 14.
__________________ GXP Mysterious darkside l ebony leather with red
headliner l sport pedals l A/C l single disc Monsoon XM l chrome l no spoiler, onstar, smokers, or mayo
Ferrari F430/612 Scaglietti - Alfa Romeo 8C - Porche 911 Turbo - Lambo Gallardo Superleggera - Aston Martin Vanquish S/DB9/Vantage - Merc SL 65/SLK 55 - Tesla Roadster - Vette Z06 - Lotus Elise - Infiniti G35 6MT - BMW M3/3 series - classics - Chevy Nova - Camaro - Vette - Dodge Challenger - Pontiac GTO
If you are running a stock tune, you will only get the boost required to satisfy a preset amount of torque, then the ECM does its magic. Some need 17 psi, some only need 14, the less restrictive exhaust is allowing the car to make the same power with less boost.
Those that have the BSR or the Westers tune are seeing higher boost because the ECM cap has been altered.
__________________
It is Cool, Leather, XM, Monsoon and different! :)
But the part that doesn't make sense is that well AFTER my exhaust, intake, IC pipe upgrades, my boost hit 17. It's not as if it was hitting 17 right after my upgrades and then the ECU took a few days to adjust. But I suppose the ECU is the only variable it could be
__________________ GXP Mysterious darkside l ebony leather with red
headliner l sport pedals l A/C l single disc Monsoon XM l chrome l no spoiler, onstar, smokers, or mayo
Ferrari F430/612 Scaglietti - Alfa Romeo 8C - Porche 911 Turbo - Lambo Gallardo Superleggera - Aston Martin Vanquish S/DB9/Vantage - Merc SL 65/SLK 55 - Tesla Roadster - Vette Z06 - Lotus Elise - Infiniti G35 6MT - BMW M3/3 series - classics - Chevy Nova - Camaro - Vette - Dodge Challenger - Pontiac GTO
Okay this coming from a totally outside perspective. This means, I am not an expert on air pressure inside turbo IC piping. Is the newer IC pipe wider in diameter than the stock piping?
In physics, Pressure = Force / Area.
With a larger IC pipe, what used to be higher in PSI will now be lower, because the Area has increased while Force remains the same (with the turbo operating at stock specifications). With the smaller stock GM tubing, the area is smaller and narrower, hence greater pressure.
So without an ECU upgrade, you will see less PSI because the operating throughput for the airflow has increased at any given slice of the turbo piping.
But I suppose the ECU is the only variable it could be
And the atmosphere. We tune our drag car based on Density Altitude in an attempt to run the same time every time. It is amazing how much the performance changes due to weather.
__________________
It is Cool, Leather, XM, Monsoon and different! :)
If you are running a stock tune, you will only get the boost required to satisfy a preset amount of torque, then the ECM does its magic. Some need 17 psi, some only need 14, the less restrictive exhaust is allowing the car to make the same power with less boost.
Those that have the BSR or the Westers tune are seeing higher boost because the ECM cap has been altered.
How do you explain (many of us) cars with manual boost controllers putting out close to 300 hp at 23 psi?
You are circumventing the first control function that the ECM uses (Wastegate control) with your manual boost controller.
If you look at your own comments you are indicating torque management, with that said the first control would be a throttle control action, even before the boost is backed off, why isn't that implemented when the ecu sees the increased torque/hp from the mbc.
