Well, since I got my SOS kit installed in May, I've been working to make sure everything is set up correctly. I'm a little on the conservative side, with AFRs in the low 11's. My AEM wideband indicates an AFR spike around 6000-6400 to the mid-13s (but immediately settling back to the 11s), but the tailpipe sniffer didn't see it and the powerband isn't wonky in that range, so it could just be my wideband My injectors all flow at 369-370cc with an excellent pattern.

My car is a 2002, with 74K miles, with CT exhaust. The SOS kit is a Stage 1 with the standard 6psi pulley.

It was HOT out today, humid and a little over 90F. I was literally pouring sweat even inside

The dyno's RPM reading seems to be off, as I was hitting the limiter/cut at a dyno-indicated 8600 or so (9K on the tach). Also, there's a bit of a dip after 8400, which could be the belt slipping a little, my stuck clutch slipping, the heat, or the AFR richening a little too much (think it was right at 11:1 at redline, maybe 10.8-10.9). I think it's more the first 3...I'm surprised the stock clutch is still holding up!

Pull was done in 4th gear. I had another previous one that made 238HP@7100 but I prematurely ended that to troubleshoot AFR so I didn't pop the motor. At the same RPM, on a hotter day, I'm pulling more than that now

Anyway, this is a Mustang dyno, so they do read lower than a dynojet (and maybe a dynapack?), but I'm VERY happy with the result. 305.5HP at 8400 indicated (but really, I think this is at ~8700 actual RPM) and 192TQ at right around 8000 indicated (8300 actual?). The boost indicated on my gauge was right at 5psi, although it got there by 8K, so maybe there is some slip.

I may be leaving 5HP on the table, but more importantly, there's probably a good bit of "area under the curve" I could recover at the top end.

All in all, good run?

 

Top end looks terrible, why didnt you change your clutch

 

it's not worn yet! After spending $6000+ already, I want to get few months before spending another $1500 on a clutch. Agreed, it needs to be done...I will probably be buying it very soon. Most likely going to go with the SOS clutch. It's not slipping in my daily driving, so I can live with it for the time being.

And, yea, looking at it more, I should be able to get +25HP at redline (reading ~285 now, probably could get it to ~310).

Does it look like clutch or belt slipping?

 

At such low boost, if installed correctly, id guess clutch, but easy way to tell is to get on highway, floor it, and see if rpms raise without going any faster

Not sure how that would look on a dynosheet, stopped intensely looking at s/c stuff when I decided on turbo

 

Your kidding me, 6k for ~100whp and you think that's good ??

I'd hope other future sc guys take a look at this thread.


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The kit was $4700 in a group buy. Add in gauges/wideband, a new soft-top, and some tools I got for this, and dyno time and that's $6000.

That power level is actually pretty normal (actually, better than normal) for the SC kits that are Paxton-based. The Comptech kit is right at $6K in fact...and it makes less HP.

I was researching a turbo kit, and decided against it due to heat issues and the fact that I'm not all that skilled yet. This is my DD...if I had another car I'd probably have gone turbo.

 

Congrats! My first dyno @10.7psi was only 326whp on a Dynojet. Yours looks good for 6psi. How's it feel on the street?

What's your VTEC set at? Many of us wind up moving it lower to get stronger midrange. Yours looks pretty solid; did you already do that?

 

Looks good, but id get a clutch. Also is your car stand alone or the jumper harness the stage one has? Ems and clutch would get you more power id bet.

 

I'm on the stock ECU with the S1 piggy-back/jumper harness or whatever the correct parlance is. Since I'm new to this, I thought it would be a good idea to keep the OBD2 while starting out. I realize this is sub-optimal and even at 6psi may gain even more with a standalone.

The piggy-back does have lines going to all 4 injectors (parallel to the ECU wires), the VTEC pins to activate the solenoid, and the MAP pins (to clamp voltage).

I believe the VTEC is at 4700RPM, over-ridden by the SOS module...and there is a small surge in the powerband at that point. Midrange is pretty good (well, better than stock)...but with the heat it is noticeably slower than it was in May when there were still 70 degree days. Now, it breaks 90 and rains a little each day, so it is very humid (FL). That lull right before 6000 feels like MORE of a lull than it really is. I would really like more midrange as I don't wind it up on the street all that much.

I do want to get an AEM EMS, 9-10lb pulley, and injectors sometime soon...I will probably just get it all from SOS as maybe they have a S2 upgrade kit, though none is mentioned on their site (and perhaps there will be a good baseline map too). After a clutch, at least. I may take it to a dynojet just to see what kind of numbers it puts out on one of those...the operator thought 320 or more would be the likely result. The place I took it to dyno pretty much just does V8 cars, so many had a hard time believing a "little 4 banger" could hit what it did with only 5 psi .

BTW, my gain was ~115HP...191 to 305.5 on the same dyno...so I got more than the ~100 that I thought I would with the S1. Perhaps with a better clutch and/or a cooler day it would have hit 310 or more...I could always find out in the fall I guess.

 

You can make over 500whp with the SOS supercharger. Just at low boost so only 300whp. Capable of much more power.