944crazy

Hey guys, I've been toying with the idea of going for a full standalone set-up in my 951. I have been talking to Raceboy about his VEMS plug and play, and it looks like a great option.

Just wondering who else on here has got it, and how do you like it?

V2Rocket

Will let you know maybe this weekend.
Don't have much free time to install it yet.

Aivar88

vems on my s2 NA, got 207 rwhp (afm delete, 100cpsi cat, dansk exhaust. everything else is stock). although conf is not perfect yet, hopefully its getting there.

shortyboy

Please document install and impressions with a thread! Please and Thank You!

944crazy

That's a nice amount of power for an n/a!

So what about it isn't perfect yet?

Aivar88

winter -20c startup is not perfect yet and some other minor things, nothing major. possibly a little more hp now, since before there was a little play in accel.-cable to TPS and it didnt fully open but thats just maybe. in future sometime will dyno again and will see then.

333pg333

-20c ?? Crikey!!!

I think the VEMS solution looks good.

Aivar88

a little costy but a nice thing to have if you want to play around, get some extra hp and delete some crap like afm whatsoever. but id recommend it only if you know how to tune, i dont so ill have to depend on raceboy for a while . plus its nice to keep your interior stock looking and get all the info you need on your android phone via bluetooth. ;p

AlphaOmegaPower

Good enough for a 16v stroker running a 67mm?

Voith

Why not it is a standalone so it will handle whatever you throw at it as long as it is set correctly.

944crazy

Wow, I'd be lucky to hit 0°c here...so that shouldn't be a problem. Did you have any problems with initial startup, or using the autotune feature at all?

Aivar88

youll have to contact Raceboy for questions about tuning and specifics... he made the install and tuneup since i dont have knowledge for it as far as i know autotune works pretty well.

Tiger03447

Odonnell and Dougs951 both run Megasquirt..heavily documented here and are willing to help with the install. Check out their threads..

V2Rocket

you know i hadn't really thought about it until now, but I paid as much for the VEMS as i did for my Subaru....

odonnell

Even a "cheap" standalone setup (like Megasquirt) is going to run in the $1000 ballpark after you get everything you need, can be less if you're junkyard savvy and willing to do 100% of your work and tuning. Or don't pimp it out with stuff like different coils and injectors.

Getting a dyno tune is $500 around here for spark and fuel maps (reputable place). If VEMS comes with a tune already set up (by a reputable dude, which Raceboy is) AND it's PnP, in my eyes it's worth at least $1750, maybe more, depending how important PnP is to you. You have just have to be bothered to spend the cash.

Re: cold starts. Temperature changes are the achilles heel of speed density tunes, there are 3 main things you have to adjust. 1) the cranking pulse curve: it essentially adjusts how much fuel is used during cranking as a function of coolant temperature. 2) warm-up enrichment: same thing, except with the car running and not just cranking. It will start high and taper down as car warms up. Cold engines don't atomize fuel as well so this is crucial. 3) Air density correction. Probably the most important here once the engine is running. It scales the fuel based on the air density (which it calculates via air temp). The only way to tune these is to have the car operate in the conditions you want to tune, and adjust them as needed.