Estimate HP by Boost Pressure.

[dudamota]

Hi guys,


Please help me estimate my Camaro HP.


I drove my car on the dynamometer.
I was recording all using HP tuners and MPVI3 ODB2 interface.


510 Whp with 9,86 PSI of boost.










Or 627 HP





So later I drove my car on the street and I was also recording with HP tunners and I got 15,23 PSI of boost





With that being said how much HP my Camaro can reach with 15,23 PSI of boost ?


There is this guy who said it can be calculated / estimated


https://youtu.be/wA8z45lfFV0?si=AQzguFzgQf5DQnzz



Is that right ?


Formula = NA x (psi/14.7) + 1


My Bariometric Pressure was 12,9 that day.


Camaro SS 2013 5th gen NA = 400 HP
So = Formula = NA x (psi/12.9) + 1




Result = 400 x (15,23/12,91) + 1 = 873 HP


Any chances that would be true ?


I am using E85 fuel.




My Camaro description =


-1 Brian Tooley Racing (BTR) Stage 2 Twin Turbo Cam Kit - LS/LSX (Steel Retainers)
-2 Brian Tooley Racing (BTR) GEN 4 Car Basic DOD/AFM Kit - L99/LS3 6.2L
-3 Basic VVT Delete Kit 3-Bolt Cam Camshaft Gear NON VVT Adapter GM L76 LZ1 L99
-4 10-15 Chevy 5th Gen Camaro Chris1313 Racing Dual Fuel Pump 450 Walbro
-5 Fore Innovations F2i Fuel Pressure
-6 MAMBA LS OIL PRESSURE ADAPTER TURBO LS1 LS2 LS3 5.7L 6.0L 6.2L COMMODORE TURBO
-7 GM LS Swap Twin Turbo Oil Supply Adapter Dual Top Port 1/8" NPT LS1 LSX LS2 LS3
-8 LS & LT Engine Block Coolant Water Threaded Drain Plug GM LS1 LS3 5.3L 6.0L 6.2
-9 1997-2013 GM LS V8 Oil Port Adapter Block Off Plate Adapter Delete Plate LSX LS1
-10 GM Gen III LS3 LS7 LS9 Cam Swap Cam Position Sensor Delete Plug Block Off LSX LS
-11 LS Barbell Oil Diverter Pickup Tube Hold Down Gallery Plug For LS1-2-3 5.3 LQ4
-12 AEM 30-0334 X-Series Wideband UEGO AFR Sensor Controller Gauge -13 MPVI3 by HP Tuners
-14 GM 3 Bar LSA LS9 Supercharged MAP Sensor LS CTS-V Camaro Corvette 12592525
-15 Bronze Bushing Rocker Arm Trunnion Kit for GEN III IV V LS1 LS2 LS3 LT1 LS7 LQ9
-16 Oil Dipstick Tube Plug For Gen 3 4 5 LS1 LS3 LS2 For Cadillac For CTS -17 Billet LS Oil Pump Pick-up Tube Pipe Hold Down Support Brace Girdle LS1 LS2 LS3
-18 Melling 10296 Oil Pump with High Volume and High Pressure For GM LS-Series - USA
-19 Injector Dynamics ID1050X 1065cc LS3 LS7 LS9 ZL1 CTS-V LSA 6.2L 1050.34.14.15.8
-20 IWIS 3SR60-2 C7R Timing Chain for LS Applications 4.8 5.3 5.7 6.0 6.2 LS1 LS2 LS
-21 180 Degree LS3 Thermostat for 2007-later LS Car & Truck Engines 4.8 5.3 6.0L 6.2
-22 MSD Super Conductor GM LS Gen III Spark Plug Wire Set 8.5mm Universal 32079
-23 Pressure Gauge Watch 0-7 Bar 0-100 Psi Metal Horse
-24 Racing Fuel Flute for LS2/LS3/L99 8AN / AN8 engines - Black
-25 Turbo A50-2.63P Auto Avionics
-26 NGK 3690 TR7IX Iridium IX Spark Plug
-27 Conduite Térmico 15cm Titanium para Cabo de Vela - Spark Plug Sleeve
-28 Timing Chain Dampener Tensioner
-29 ARP Intake Bolt Set 430-2001
-30 Plug N Play 2010-2022 Camaro SS/1LE/V6 E85 Flex Fuel Kit

[DUSSTED]

You can kinda calculate crank HP using hptuners by logging the "delivered engine torque" and "engine speed(rpm)" parameters. Then make a new math formula that goes like this: (Torque PID x RPM PID) / 5252 and set up a graph to display that formula. That will give you an estimate of the crank HP if your torque tables are tuned correctly. You can also multiply it by .8 to account for drivetrain loss.

[dudamota]

Originally Posted by DUSSTED

You can kinda calculate crank HP using hptuners by logging the "delivered engine torque" and "engine speed(rpm)" parameters. Then make a new math formula that goes like this: (Torque PID x RPM PID) / 5252 and set up a graph to display that formula. That will give you an estimate of the crank HP if your torque tables are tuned correctly. You can also multiply it by .8 to account for drivetrain loss.

I will probably need to add those channels in my HP tuner VCM scanner before I record the log.


I guess they are not active or added when I recored my logs so when I try to create MATH using those channels they are in read.







Also a good video about this =


Thank you for the tip.

[dudamota]

So, Can someone confirm if I am doing the right math ?

- Alcohol Percent = 44,3%
- Max Boost Presure = 13,63 PSI
- Max Torque = 1132 lb.ft
- Max HP = 985hp










- Alcohol Percent = 61,6%
- Max Boost Presure = 14,07 PSI
- Max Torque = 1183 lb.ft
- Max HP = 1005hp

[bsn]

You really can't get an estimate just by boost-to many variables. Also remember boost is a measure of restriction. It doesn't look like you have done any head work. You get to a point where boost increases but the gain in hp starts to drop off. Exhaust can also create a gain in boost but restrict horsepower. You can have two identical cars except one is set up for optimal air flow. The one set up for optimal air flow will create less boost but make more horsepower.

[Batmanntexas]

Originally Posted by bsn

You really can't get an estimate just by boost-to many variables. Also remember boost is a measure of restriction. It doesn't look like you have done any head work. You get to a point where boost increases but the gain in hp starts to drop off. Exhaust can also create a gain in boost but restrict horsepower. You can have two identical cars except one is set up for optimal air flow. The one set up for optimal air flow will create less boost but make more horsepower.

Facts!!

[SSE 4 2SS]

To add to the above comment, bare in mind boost creates heat. Where you may gain 15 hp per lbs of boost at mild boost settings, the harder you push the boost, the more heat you create, which is a diminishing return condition.


Another variable, is where the boost map is for a particular turbo/s. If you stay out of the preferred areas, you can either struggle to make boost, or create too much heat in an attempt to do so.


For example, in my original set up, with 67/66 small frame turbos, we were sitting at 95°F at the start of a 1/4 mile, and upwards of 180° IAT's at the finish line... My later iteration, running twin 76/75's (mid frame) we were sitting 90°F IAT's at the start line, (ambient temps) and were in the 120° F range at the big end of a mile pass at WOT.


Why, because the bigger turbos were not working as hard to push the boost. Think a small desk fan in a room vs a decent size ceiling fan. The larger unit doesn't work as hard to move the same boost, but the trade off is the potential for spooling lag.


There are formulas to guide, but none of them are hard fast answers for all set-ups, or even within a similar set-up... You may make 15 HP per lb/boost at 5-8 psi, and less than 10 hp at 10-15 psi of boost, on the same vehicle...