JET951

if you want more power, start with a turbo. otherwise you will always be chasing your tail, unless your car is built to a class. as a few of our customer cars are. going standalone in my opinion is a complete waste of time. This of course is my opinion.
As patrick says be careful with numbers. one dyno is not what the next dyno will produce.
what would i do? well if i were after the fastest lap times i would sell my 944 turbo and buy a radical. but i like to make our 951 faster and thats what brings a smile to my face, when i can compete with gt3's thats what i feel its all about.
$1000au wont even get you a base tune in any standalone. then plan another $1000au for each additional tune at the very least.
We bought a vitesse stage 3 knowing that it works, its performed flawlessly on our car for 3 years with no problems and has several lap records.
if you want to take your s2 to the next level, then cams and exhaust are the way to go. it will not be cheap, just dont expect the same performance gains as a turbo.

HJK

If it's a street car, I don't know if i'd go full stand alone. For me it was ok, since the car was stripped and we replaced all wiring, so that took care of wiring for the Motec.
The dyno numbers are just that, numbers, all I know is that we stepped up power with 15hp after installing the bigger injectors and re-tuning the engine. We'll be doing that again this week to tune in the new FPR, TPS etc. I just dont know if it would be worth the hassle for a daily driver.

H

fast951

To get the most out of your S2, you must tune it. The S2 MAF + our software gained approx 10-17hp across the board (based on a before and after on pump gas). We are not concerned about peak numbers. The area under the power curve is much more important to us. So is throttle response.

We work with front runner serious racers, they bring their cars from all over the USA to get them tuned. Tuning is the only way to get the "most" out of a engine. Obviously, some cannot travel thousands of miles to tune their cars, which is why we came up with a PiggyBack solution so they can alter the tune we supply.

Having tuned many S2s in various configurations, some are supercharged. The first thing I would concentrate on is the health of the engine. A worn out engine will not make any power no matter what. Plugs, plug wires, cap & rotor, fuel injectors, AFM, knock sensors.. all must be functioning properly to get any power out of the engine. A healthy engine might make more, a worn out engine will not make the power and should be refreshed first.

Don't expect huge numbers. The more power you want to get out of your engine, the more expensive it gets.

Eric_Oz_S2

It is a street car, but not a daily driver. It's getting more track orientated all the time. Already have installed stiffer springs, coilovers, 968CS sway bars. Next is race seat then LSD. I don't want to rip out the interior. I would like to increase power to around 240hp to get near class limits, get more driving experience and then finally install a supercharger.

Do you kow what sort of AFR you are getting at WOT with those bigger injectors (on the last dyno)? Was the extra hp achieved much higher in the rev range?

Mark944na86

John, this is a little ambiguous: When you say "10-17rwhp across the board", are you talking about a 10-17hp increase in max hp? Or are you talking about an increase of 10-17rwhp across the whole rpm range ("area under power curve")?

HJK

When/If we're dynoing this week i will pay some more attention to those details and will revert. The way my guy works, is he hooks the laptop up to the motec. the car has got a wideband o2 sensor and they just fiddle with that laptop for hours. If I have the chance to be at the dyno i will look for your numbers.

Henk

fast951

Power gains were observed across the board, across the RPM range (at WOT of course). The area under the power curve!

Mark944na86

So, is the 10-17hp increase you refer to an increase of max hp? Or are you saying at all parts of the power curve (say 3000rpm) you will see an increase of somewhere between 10-17hp?

fast951

The chart I have did not start till 3000rpm. As a example, at 3400 RPM we saw 8hp gain and 12 lb-ft. @3800 RPM we saw a gain 12hp and 16 lb-ft.. @5100 we saw 15 & 15. (at he crank - this was on 100+K miles engines).

On a fresh engine we saw much higher numbers. Numbers also differ between stock and non stock exhaust & headers.

As mentioned already, the above are just numbers. You use a different dyno, the numbers will be different.

fast951

To get the fastest lap time, I would concentrate on suspension, brakes and driving skills. The extra 10-20hp will not make a huge difference, unless you are getting 100% out of your car.
I have tuned a class winner S2 that made below average power, as the engine needed some attention. The car was a front runner because it was setup correctly and the driver was a hot shoe.
I also tuned S2s that made amazing power (for a S2), but ran mid-pack as the setup and the driver were still improving.

Having said that, we all want more power

Rogue_Ant

meh - it is just a software change... MAP sensor is not hardware dependent.

Eric_Oz_S2

John, what sort of power do you call amazing? Is that similar to the 17hp you mentioned earlier or much higher? In your experience, is there much to be gained by either swapping the cat for an aftermarket hi flow or cat delete in conjunction with your MAF and dyno tune?

Dubai944

Another cheaper option is a piggyback. I ran a Haltech Interceptor last year when my car was naturally aspirated. Although there are tuning limitations it was enough to allow needed adjustment for cams and bigger injectors, exhaust etc. Very simple install and easy to tune.

The Haltech even ran fine with my initial low boost supercharger install, but once I upped the boost the MAF was maxed out and limitations in fueling control started to show up. I have now gone to a Motec standalone and MAP for more tuning control.

Eric_Oz_S2

What sensors does the Haltech intercept? Does the Haltech allow ignition timing adjustments? Is the fuel control done by altering the AFM signal?

What sort of improvement did the Haltech give you for the NA configuration?

HJK

Eric,

You live in the land of Motec! Why don't you have some one have a look if they can use your existing wiring, get a second hand M4 and a few sensors and of you go, plenty of flexibility for the future, turbo charge, supercharge, anything goes. If you have a bit of interest yourself you get the connecting cables and the software is a free download from Motec website, they even give training there! man, a world opens up.....

H