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Well if you go look at the Dyno sheets, you will see a few runs on a non-stock 944. Not mine a friends.
But figure this that car had a 154 HP on tap and yielded around 228 on up to 240.
On say a car with 125HP at the wheels expect a minimum increase of about 40% to 50% @ 5 PSI, properly tuned you should see slightly more. This assumes a minimum gain of 8% or 10% per PSI.
128 HP @ the wheels + 40% = 179.2 RWHP
128 HP @ the wheels + 50% = 192.0 RWHP
LOW SIDE ESTIMATE: 51 HP GAIN @ 5 PSI
If you want to look at Flywheel HP lets assume the factory rating is slighty off do to the age and state of tune of your car.
155 HP + 40% = 217.0 HP
155 HP + 50% = 232.5 HP
Drive line loss is debateable Lets assume 20% Driveline loss.
217.0 - 20%= 173.6 RWHP
232.5 - 20%= 186.0 RWHP
If you run at 6 PSI, which is what the unit would be rated at, well then do the math 48% or 60%
COST PER HP:
Assuming you spend say 1200 for 51 HP
1200 for a unit and misc support ware to make it work (making a bracket, fuel, igntion, whatever you source or buy from me)
That is $23.51 per HP gained on the low side.
MORE NET HP and the price drops. Spend less and the price per HP gained drops.
When Calculating Power gains a lot of variables must be calculated.
As such I have a lot of formula and calculations and how to calculate all this including accounting for delat rise, etc on the website.
Some people will say that you can expect 10 HP per PSI, but thats usually less than actual in practice.
Lets talk Lower boost for a moment.
Lets say get a 6 or 8 PSI unit and then dump everything over 3 PSI, to be safe, then later you can increase HP as you go.
@ 3 PSI take the engines HP and add 24-30%, closer to 30%. Boost is funny, you have to allow or account for Delta/heat rise at lower boost levels you will see less heat, as such you can tune for more power do to the cooler and there for denser air.
@ 3 PSI
128 HP + 24% = 163.8 RWHP
128 HP + 30% = 166.4 RWHP
LOW SIDE ESTIMATE: 35 HP GAIN @ 3 PSI, not a lot, but again you are being safe.
128 HP is typical RWHP on a 944 NA, dyno after dyno shows 125HP-131 HP with 128 HP being typical on stock NA cars. Chipped, tuned, etc.. more Base HP.
More base HP before boost means more HP after Boost.
I will get into the driveline and brake discussion briefly, but remember I ran my car on boost for years without any issues till finally I grenaded the clutch. I drive like I stole the car, all the time.
Anyway I will get into it, but you have to wait till I get back from church. So say 2 Hours. See ya then. Remember more formula and specs are on the website. You can also post questions and comments over their.
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