The sotkc injectors are 17 lbs/HR and are running at 80% duty cycle on a stock engine. By tuning the ECU to extract more power and then adding a CAI (not filters in the engine compartment) you will put too much of a strain on the injectors and run into a lean state over 4800 RPM.

Jump on a dyno and get some A/F ratios taken if you have this set up. One of two thngs will happen: you will have over 200 RWHP at around 4500 mark and then lean out, or you'll get a full run and barely break the 200 RWHP mark.

17 lbs injectors are good for about an extra 13 HP on these engines, safely.

 

TVT:

Where can i get these 17 lbs injectors?

So with these injectors, single CAI, and ecu re-map i should be over the 250Bhp.

Shaynan

 

You already have 17lb injectors... you need more than 17 for more power.

 

Oh I see... I will continue my quest to pass the 250bhp mark!

 

I had more than 250 crank hp and you definately don't need an extra or different injectors to get to that power level, like, not at all. These injectors have gone up to 275hp on a benz owned by a guy at SI and he had no problems.

 

The second calculator down on this page can help you determine which size injectors you need to achieve your horsepower goals.
http://www.rceng.com/technical.aspx
I calculated 22.5 lb per hour injectors to get 250 crank horsepower at a safe 80% duty cycle. You should note that our cars have about 58 psi fuel pressure.
Also, I pulled this off another thread. This is the injector other mercedes 3.2's run

 

So here's the question...If you swap the Benz-Bosch 0-280-156-072 injectors into a NA Crossfire without any other mods, what happens ?

Will the ECU just adjust in "closed loop" mode and run 'em at a lower duty cycle ?

If so you would just see a little richer mix at wide open throttle and cold start right ?

That sounds OK to me...

Slim

 

Thats the theory. At low throttle positions the ecu should adjust to run stoichiometric. At WOT you should get richer and more power. The only thing is that eventually the ecu will adjust the maps for open loop based on the closed loop conditions. At least that is another theory. If all this is true than I think the best way to get a richer mixture is to simply trick the ecu into thinking the car is running on the lean side by adding or removing resistance to the O2 sensors. This in theory should have you running rich all the time(and get poor gas mileage). Or , you could add a seventh injector etc etc etc......
There is probably a hundred way to address this situation. Some will work better than others.

 

Those injectors you note are for teh supercharged car and will not run in our cars. You will be so rich I doubt the engine would start, and if it did would flood shortly afterwards.

There are no bolt in injectors made for the MB cars that will work on our cars, you've got to be creative and do your research.

 

Why don't you just share with us the injectors you put in your car? Or is that classified TVT information? LOL.

 

These injectors will bolt on and will work with a piggyback computer to alter the maf signal. Most european and american car injectors will bolt on with little to no modification. They just have to be high impedance and the flow that you are looking for. By no means was I telling anyone they should put these injectors on their NA. If you read my previos post I said a 22.5 lb/hr injector would be ideal for the minor flow improvements you are going to get with the NA 3.2.

 

You can use just about any injector, just clip the plugs and rewire them onto the stock plugs.

 

Sorry, didn't read your post, but yeah, what he said. You could probably run the stock ecu and just throw on an upgraded fuel pump.

That's all besides the fact though, I made like 210 whp is my car with just an ecu upgrade, that's basically 250 crank hp (like 245 actually). Just get the pullies from evo sport or whoever and you are at 250.

 

Xed did you ever run the quarter with your car? if so what were the results with your tune?

 

Funny how those last comments kinda shut this thread down, lol.

I never ran the 1/4, there aren't any near my house, but I did run the 1/8th. I'll see if I can find my slip, it wasn't a great time, I had all weather tires but still managed to pull off a 2.1 60'. But from the top of my head I think I was running 9.6-9.9. I think it had another .3 in it, but it was my first and only time at the track in this car.