Another AFC install!

[4drboost]

Well, its in and working I think. I havent hooked my laptop up to it yet, and there is no other way to actually tell if I have it hooked up right, but it does feel alot better. I havent got on it yet, cause im scared sometimes, but under normal boost it feels stronger, and pulls harder with less bogging between shifts. The only weird thing, is for the first couple of startups, when the car is cold, it would idle realy bad, rough and low, then high, than low, but just for a minute, than it would smooth out and run fine. Do you think the ECU was just relearning or something? Oh well, time to hit the dyno and see what its got. Just thought I would share, I give it an A+

Ian

[ZMN BY U]

WHICH afc did you install

[4drboost]

Oh, sorry, DSM's AFC.

[tricky]

That's odd. I thought DSM's afc only kicked in when in positive boost
( >0 psi). PM boomergt, he's a local that has one and i'm sure he's more than willing to take a look at it with you

[peepsalot]

That's odd. I thought DSM's afc only kicked in when in positive boost
( >0 psi). PM boomergt, he's a local that has one and i'm sure he's more than willing to take a look at it with you
Yes, that's correct. If you get a chance to look at a map you can see this, the map is a table of fuel trim values with rpm on one axis, and manifold pressure on the other. In vacuum, all the values are 10 which means the fuel is kept stock. The map that comes with the AFC just leaves these values unchanged, but you still have the ability to adjust these values if you ever want to.

[lcruz64]

does anyone have an idea on how to tune for bigger injectors? Do you just reduce fuel all the way thru to fix idling?

[ZMN BY U]

I have had nothing but problems with this dsm afc im not very happy with it. Rough idle is a major problem i think the ecu learns of the afc and tries to correct the afc which causes a problem. I still get major hesitation and ive had this thing for about 6 months now. Not too impressed with it.

[speed1016]

have you took your car to a dyno yet? If not I would recommend doing so. Then you can send dsm your a/f reading and get it properly tuned. That will most likely solve your problem.

[4drboost]

Ok, so when they say you gain like 50 more torque over stock at 10psi, does that include the boost increase? Cause I was running 10psi before the afc, and it dosent feel THAT much different now. I mean, it does, the hessitation after shifts, or the bog is gone. I guess I was never clear on the dyno that DSM had.

[ForceFed]

Most of that gain is from upping the boost...not from the AFC....there is no way that AFC alone gave you 50 ft. lbs more....the upped boost did though.

[4drboost]

Ok, thats what I thought, so then I guess the AFC is doing its job.

[ZMN BY U]

speed i have dynod the car 4 pulls the best on 10 psi was 185 hp and 191tque at stock boost it was 160 whp and at 8 psi it was 172whp car is running very rich around 10 at 4000 through 6200 rpms.

[4drboost]

Just to make sure, im running 10psi with the AFC, but im using an MBC, so its spiking like 11 to 12 just for a split second, should this be ok? The AFC is tuned a little rich to componsate right?

[ZMN BY U]

yeh its rich alright you cant smell the dam fuel after you drive it for awhile. I can smell it after i cut it off everytime man.

[speed1016]

just curious what your af ratio was when you had 10psi? Thanks

[DSMConvert]

zmn at this point the only thing I can figure is that you got a bad unit...thus far we've sold 56 units, well at the end of april tallys, and we just had one that was bad....the guy was having the same problems, so we shipped him a new one asap and he said it runs perfect now...We haven't gotten the defective one back yet so I"m not exactly sure what was causing it, but he ran a voltmeter on it and it was outputting bogus maf signals to the ecu....we try our best to quality check these before they go out, 1 out of 56 is pretty good in my books, but its bound to happen that one will get out that will be defective....I'm out sick today so all my notes are at the shop on our corespondences but if you havent already completely unhook the unit and see if it makes a difference, i've had several different techs compare dynos, try to duplicate the results and even tear the maps completely apart and we come up with an "act of god" everytime, which with the MSP history doesnt seem like that far of a reach.... Now on the idle issue, we've had several people ask us if we could do something for the idle, being as both msps with and without our units have been having idling problems and we're currently toying around with a few maps that adjust the fuel trim at idle...the trick is to find a balance between being too lean at idle(the car idles 100 times better but then has the potential to go very lean initially if slammed off the line) vs. rich at idle(doesnt idle as smoothly but give good a/fs when slammed out of the hole) as we get further along with it i'll post up reports on here and on the website...

[noclue119]

Thx DSM looking forward to it.(2thumbs)

[speed1016]

outstanding. 1 out of 56 is a good rep.in my book also. Keep us posted. Thanks again for all the time and effort.

[CasopoliS]

Mine runs great, great idle, pulls great, easy tune. zmn you are the first I have heard complain.... I hope you get things working.

[speed1016]

dont know about the idle but everything else is a hell of alot better! MY best mod...well next to the internals!(alright)

[4drboost]

What about my spiking issue? Im still hitting 13psi and falls down to 10 quickly. Am I ok? The unichip spikes at 13. Maybe im just being to paranoid.

[CasopoliS]

What about my spiking issue? Im still hitting 13psi and falls down to 10 quickly. Am I ok? The unichip spikes at 13. Maybe im just being to paranoid.

Spiking is a funciton of the boost controller mostly, I would maybe try to lower it to a 12psi spike and 9psi flat during WOT at max setting. There is no need to risk those internals for 1-2 psi. I think I flat down to 8 now, and that is plenty fine for me. If you drive daily at 10, that might be pushing it.

[4drboost]

Oh, and for the idle thing, it just seems to do it while the O2 sensor is warming up. Once my car is warm, I could shut it off and start it, and it will run just fine, so its only on the first start when the car is cold. But I guess even DSM is having this problem too.

[otmsp]

Does anyone know when the FTC will be ready?