rage2

This is a continuation of the 951 mod story thread.

Got the 72# injectors installed last night. Took a calculator and divided my rpm fuel settings on my SDS and it was dead on (except for idle). Added a bit more fuel at idle and the car drives like a stocker. Fuel map changes took less than 5 minutes (I'm addicted to standalone fuel management, anyone considering Mass Air Flow should consider this route instead!)

Perfect idle, can't tell it's been modded until driven hard. I was hoping the car would be more powerful but it doesn't feel that fast. It definately is a lot faster, ran with a benchmark car (SLK 32 AMG) and pulled away at a better rate than before. Car runs out of road really quickly. I think it's because the torque curve is so flat that gives the illusion that it's not that quick. I believe Danno had the same issues with his car, which dyno'd at 340rwhp. One thing for sure, I really need new brakes, and should stop testing the car on winter tires =). Seat of the pants power measurement : I'm guessing I'm running around 400-430hp.

Starting to get some knock at 13psi, so looks like I have to work on some spark timing now. Won't have time until next week to play with that. Also hoping to get some dyno runs to get a real measure of the power I'm making. My goal is 18psi on pump fuel, 22psi on 110 octane for short runs such as drag races, and to spank my friend's Viper ACR by a large margin. The quest continues...

Luke

What was the price of the sds?

rage2

SDS EFI EM-3F $1100US (4 cylinder fuel and spark)
3 bar MAP sensor $85US
upgrade to backlit programmer $55

This removes everything between your turbo intake and air filter. No more restrictions! The MAP sensor sits in the intake manifold past the throttle body to detect pressure. Fuel is calculated using rpm, throttle position, manifold pressure, and temperature as input.

Your base map is done on a rpm curve. Manifold Pressure and Temperature are maps to modify that base map based on engine conditions. That goes for both fuel and spark.

The mass air flow is easier to install, but the SDS (or any standalone EFI system) will be a hundred times more flexible in tuning.

Dan87951

Wow $1100! Where did you purchase your system from? Did you do the install yourself? All that hard? Let us know a little about how the system works, benefits, tuning ability.

Luke

.......hmmmmm maybe I'll have some money left over from my tranny rebuild? (wait.. I just bought a MAF... crap!)

Mike B

Here is the link to SDS (Simple Digital Systems)

If only money grew on trees

TurboGuy

Rage,

What injector duty cycle are you getting now under full load ? 18PSI on pump gas will knock for sure.

rage2

Dan87951, I bought it straight from SDS at retail prices. They're in the same town as me so I just went to their warehouse and picked up what I needed. The install was done by my mechanic. He said the toughest part was getting the wiring done. Not really tough, just very time consuming. He got all the wiring right on the first try without going over his work =). As for the benefits, check out the site, it's got everything you need to know.

13psi, at redline, 61% duty cycle. Lots of room to play. I was told we could probably get away with 18psi by tweaking the spark timing a bit. We hit 13psi without much retard.

adrial

How long did it take the mech to install it?

thanks,
Adrial

Danno

Darn, I was hoping that was CANADIAN-dollars!