Highlander944

Hey guys, I'll make this quicker.

I did a search looking for RWHP gains from chip and MAF/MAP upgrades. I was a bit surprised to see that rarely did any 944T dyno at the Porsche rated HP. Is the Porsche rated HP not rwhp? Seems odd that the non S puts out 190-200 and the S puts out 220... both about 10% less than manufacturer specs.

Continuing on that thought how can any shop claim 310RWHP from stock injectors when installing a MAF or MAP kit? I understand how the more free flowing kits can and do add low end HP/Torque, but peak, IE w/ boost should be similar for a stock turbo, right?

So I guess, getting a 944T to 300HP involves, Better air flow, Bigger Turbo, new injectors, "getting 15-18psi of boost", would that be correct? Looking at the dyno charts posted around this site, it would seem 300 rwhp is somewhat difficult to achieve, is that correct?

Peter.

bronco951

all cars have there horsepower rated at the flywheel, not the rear wheels.

David Floyd

Not that hard to make 300rwhp, just a little cash.

Take a look here www.vitesseracing.com

OriginalSterm

horsepower numbers from a chassis dyno are usually at the wheels. you can do a rough calculation and figure 15% more hp at the flywheel.

Waterguy

The stock injectors and stock 2.5 bar fpr max out somewhere around 240-250 rwhp at 100% duty cycle, although I have heard higher numbers. You can get to 260-280 with a 3 bar fpr, and higher with higher fuel pressure. You can run stock injectors at 310 rwhp, but are unlikely to be able to maintain a 12.5:1 air/fuel ratio, so the question is how long does the engine last.

The stock turbo will theoretically make over 300 rwhp, although NZ951 is the first I have seen actually achieve it. IMHO the cheapest way to 300 rwhp would be: upgraded wastegate, testpipe, 55# injectors, Guru 18psi chips/3 bar fpr/ manual boost controller at 18psi. This should do it for about $800. The MAF or MAP increases efficiency and tunability, but is not strictly necessary. Keep in mind though that wonderful saying, "fast, cheap, reliable: pick any two." For example, your turbo will be spinning at 130,000 rpm or higher, and won't last long. At 18 psi on pump gas, your tuning better be perfect or there goes your head gasket. How hot is your oil? etc, etc.

turbo951fan

HP stated from the manufacturer are flywheel, dyno HP are rwhp

ninefiveone

Yes and no. There's a lot to be gained from better engine control. MAF/MAP kits do more than provide better air flow, they also do a better job of metering airflow which allows for better tuning. Stand along engine management alows for all of that plus more discrete control over engine parameters (i.e. even better tuning). NZ951 has nicely demonstrated what can be accomplished with standalone and some other mods but still on the stock turbo.

But standalone can be daunting for some folks and bolt-ons offer another path to power.

superjet.1

The Link standalone plugs into all stock connectors does take a day to install but can be done by most do it yourselfers and im going to preprogram them for fast and easy start up. But it will still invove some dyno tunning in most cases.