As my research on tuners continues I have narrowed it down to three. <img src="graemlins/jumper.gif" border="0" alt="[jumper]" /> S Car Go is one of them. Has anyone had any experience with them? Any feedback would be appreciated. <img src="graemlins/xyxwave.gif" border="0" alt="[bigbye]" />

 

I think the cheapest and safest way is to ship the engine to Germany and let it here done.
It will cost you $1000 more on shipping but you will have an engine build by a shop that has experience with them and this will safe you a lot of headaches.
It is different if you already have a shop in the US that has experince with them.
be carefullthe 996 TT is not a 993 TT. So you need a shop that has a lot of experince with the new TT engine. The same apply for the GT3 cup cars.
The engine is not the same as on the 996 and far away from a 993 engine. This engine is similar to the GT1 Le Mans car and to the 996 TT engine.
I know only of Alex Job racing that can work on these cars. Maybe teh racer groups are good too.
Maybe some US Porsche drivers has more infos and can help you on that.

Konstantin

Konstantin

 

Great Choice! Rob King is a straight up guy!

 

S CARGO tunes the ECU itself, unlike the Unichip. I am not sure which is better. I think the Unichip program under same boost leans the car out more so than ECU tuning. According to their salesman at Racers Group, he told me without even dynoing the car, the car would require Additional Injectors, stating the car would surely run lean at 1.2 bar, even without headers. ScarGo told me, why put additional injectors, if the car is not running lean. SCG's clients haven't run lean yet, even with headers. SO, I am assuming tuning the Unichip to the same boost level as tuning the ECU leans the car out. Perhaps it is the way the Unichip works by "fooling " the ecu. IT however, is a very successful piggy back unit, however its better to replace the injectors rather than add IMHO. In Supra tuning, and Lingenfelters' Twin turbos, Hennessey's Twin Turbo Vipers, they increase the size of the injectors rather than add. Why re-invent the wheel or develop a "work around" when you can follow best practices. I know in Chad's car he has the additional injectors and hte car is running strong. However it is not the only way, and surely not the most cost effective way.

Scargo also suggests addressing the fuel with more efficient fuel pressure regulators/pump. They also do in house flow testing with the injectors.

Excerp from "Larger Injectors vs. Additional Injectors" Post I made back in May:
In my SUPRA, we replaced the 560cc injectors with 720cc and had the ECU control the larger injectors and increased size of fuel lines and replaced fuel pumps. Now, an ecu programmed to control larger injectors in my opinion is preferred over using AICs (additional injector controller)... UNLESS, the flow required for the power output is such that the injector duty cycles would simply be too low at idle, yielding uneven spray or essentially "dripping" fuel. I know that as injectors get larger and larger... at some point, it will start to yield roughness at injector duty cycles... but, I don't think w/ an expected output level of even 750HP or less, that our cars requires AICs for that reason. Also, if fuel is needed, then fuel pressure, pump, and fuel line size affect injector performance/specs greatly. Why not optimize rather than add? Its cheaper, and less noticable.

Duane, Keep an open mind, and I will let you know how the car is when I get it back from SCARGO. I was warned of the size of the company and its lack of "Glitter and glamour," but their overhead is your overhead. I could care less what the shop size is, as long as I believe there is good people there with good intentions, and great knowledge.

My 2 cents.

 

To get 600 hp or more safely from the car you need larger injectors. Stock injectors are running 18-19ms (max is 21-22ms) to produce the 550-600 "stage 4 power" offered by some tuners. This time is too long and if Bosch (or any) injectors run this duration for an extended time they will fail.

As we get to higher hp in these cars, the fact is that we need larger injectors and a larger or second fuel pump. There is only one right way to do this- larger injectors, better lines, addressing the fuel pump issue and programming the ecu appropriately.

The two incorrect ways to get extra fuel- injectors in the throttle body or extra injectors somewhere in the intake system, will result in non-uniform air/fuel mixtures to various cylinders. This is a greasemonkey approach and reflects someone either trying to save time, money or both and puts a motor at high risk of glueing. Don't let anyone pull this horsesh*t with your motor. Nobody has mentioned tuning with EGT's- thus there is no documentation that the car is running within safe limits.

A 3.6 boxer motor probably will run smoothly on any injector up to about 750cc.

 

When SCARGO tunes the motor, they hook up AFR and EGT guages as well. They also suggest LARGER injectors, and secondary fuel pump. This is a very similar recipe used in the surpra tuners, though they recommend a second STOCK class fuel pump. ANyhow, point understood. Thanks.