Dsm Link and MAF-T question on venting =/

[Joe-GSX]

Ok I am wanting to vent to the atmosphere on my 2g GSX with my greddy RS.. (Please do not flame me) Here is what I understand by reading the FAQ's and other threads.. You'll easily run too rich because our dsms are recirc'd stock.. So here's my question, If i get dsm link and I install the greddy RS BOV can I tune it and Idle just fine and not be too rich when I shift, or do I also have to go through the whole Maft crap too??

 

[DoyoFCT]

if you haveee to vent, it will be ok to drive, but dont expect the tune to be perfect...and expect some drivability issues, 2g's seem to handle it better than 1g's in my experience.

some cars handle it better than others for some reason.... but its not as bad as some ppl will make it out to be.

 

[Boo5t_Addict]

MAF-T in blowthrough is the only way to vent correctly on a DSM. Seriously, that's it. Look at it this way, that just gives you two ways to tune, and then you can really fine tune your setup. I believe MAF-T is tuned in 5% increments, but seeing as how it's 4:30 a.m. eastern time, and I've been hitting the bottle (girl dumped me, but I can't feel feelings, so it's all good), I may be wrong. But yeah, the mass air flow translator in blow through setup is the only safe way to vent. This way, the blow off valve is before the mass air sensor, and you engine won't be metering air that isn't in your engine. If venting is a must for you (and I understand, it does sound cool, I don't care what anyone says), then you gotta use a translator, and set up the GM MAS in blow through. Biggest thing is, this'll help you take care of your car.

 

[eclipseGSTud]

Boo5t Addict, is correct about you having to use the GM MAFT in blow through set-up to vent properly. Looks like you are running stock injectors so just set the GM MAFT for 450cc injectors and zero out the rest of the knobs and use DSMlink to tune for the rest. Your money would be better off spent on getting other mods, but if you really want to vent to the atmosphere then do it properly with the GM MAFT in blow through setup. Oh, and sorry to hear about your girl troubles Boo5t Addict.

 

[c4uldr0n]

I run DSMLINK w/ GM MAF-T in blow through, works slick!

Check out this page to get your LTFT's set properly with GM MAF-T + DSMLINK
http://www.jeffgst.com/gmafcalibration2.html

Check out this page to get your GM MAF-T calibrated (wot)
http://www.jeffgst.com/gmafcalibration1.html

After you get those done, DSMLINK + GM-MAFT will work great and you will have the nice "feature" to vent

 

[Boo5t_Addict]

Oh, and sorry to hear about your girl troubles Boo5t Addict

Lol, thanks bro. In time I won't even care, it just sucks for now. I just had a moment of drunken weakness, hense speaking of it in my post. Alcohol only makes things worse.

To the OP, the links that c4uldr0n posted would be very helpful for you. Good luck in your endeavors, man.

 

[illegal99si]

get the gm maf and maf-t with the dsmlink and youll run fine without recirculating

 

[JayRolla]

Or speed desity with something like aem can do it. Maf-t/dsmlink setup is pretty much the best bet if you dont want anything quicker than 10's. Now my buddys are having problems running e85 with dsmlink but thats the 1600cc injectors he is trying to tune.

 

[Boo5t_Addict]

True, speed density with AEM would definitely be the way to go. But AEM is expensive, and a lot of shops aren't as skilled with tuning AEM EMS as much as they'd advertise. I can't give any firsthand accounts, but I can say that whatever tuning method is chosen, you should call around to some shops and see who is familiar with what if you're getting a shop to do the tuning for you. Good call on the AEM, JayRolla, I totally forgot about that.

 

[JayRolla]

I know its expensive I was just mentioning another route of doing it.

 

[RMeadows]

I run DSMLINK w/ GM MAF-T in blow through, works slick!

Check out this page to get your LTFT's set properly with GM MAF-T + DSMLINK
http://www.jeffgst.com/gmafcalibration2.html

Check out this page to get your GM MAF-T calibrated (wot)
http://www.jeffgst.com/gmafcalibration1.html

After you get those done, DSMLINK + GM-MAFT will work great and you will have the nice "feature" to vent

Thank you SO much for those links. Will really come in handy when my DSMLink arrives

 

[Joe-GSX]

Thanks everyone for all the replies! They are really helpful! Looks like i'm gonna go out and spend about $400 on the whole blow through/MAFT install. One last Q though, what do I do with my stock intake pipe if I install the whole blow through set up??Do i replace it with an aftermarket intake that is basically just straight pipe?

 

[talon187]

i mean dsm link and maft are nice but really pricey if you ask me depnds on what your goals are you could also run afc2 and maft or toss the maft and get vpc and gcc if you can also vent correctly with vpc but they are alittle hard to come by. i have friends running 11s and 10s with vpc and gcc its all up to you

 

[talon187]

blow threw has to be put in the intercooler piping. you can put it in the intake pipe if you want but you wont vent correctly that way

 

[Joe-GSX]

So in other words don't mess with my stock air intake piping correct?

 

[MrBoxx]

The GM MAFt setup needs to be installed in the upper intercooler pipe, post-BOV and pre-TB (blow-through mode) in order to vent correctly. Putting the MAF in the intake pipe, pre-turbo, is just the same as your stock MAS.

DejonPowerhouse makes some nice MAFt IC pipes, as the stock pipes won't work without some coupler modifications and they're still a little restrictive.

 

[c4uldr0n]

the idea to vent is to blow off unmetered air, so you want the new GM MAF-T combo to be hooked up between the BOV and the throttle body. I would get a 2G throttle body elbo and custom make the upper intercooler charge piping, the dejon kit is "nice" but custom will be less expensive if you can do some of the work yourself.

 

[Joe-GSX]

the idea to vent is to blow off unmetered air, so you want the new GM MAF-T combo to be hooked up between the BOV and the throttle body. I would get a 2G throttle body elbo and custom make the upper intercooler charge piping, the dejon kit is "nice" but custom will be less expensive if you can do some of the work yourself.

Yeah well I already ordered the piping so i'm SOL.. ..

I understand that its all on the UICP.. when I was asking about my stock intake pipe is.. Well, our cars are recirc'd stock so when I vent to the atmosphere, what happens to the hose and all going back into the intake pipe?? Will there just be a big whole where it was? ### that can't be healthy.. Maybe i'm picturing how the whole MAFT is set up wrong.

 

[MrBoxx]

You need to find a proper sized plug for the recirculation hole on the intake pipe, but if you do that, you need to be EXTRA careful to make sure that said plug cannot, repeat CAN NOT, get sucked into the intake stream. You can probably imagine what would happen if a 1" diameter chunk of plastic or metal or whatever you use as a plug fell into the compressor inlet and got eaten by the compressor wheel.

The other option is to purchase a new intake pipe with no recirculation bung. Forced Performance sells an amazing-looking 4" intake pipe (needs a reducer coupler if you're going to a small inlet turbo) or ExtremePSI sells a very nice intake pipe that looks exactly like the Injen intake. It will bolt up to almost any turbo up to big 16g size or so without the need for extra couplers. If you have the funds, I highly recommend going this route as opposed to making a plug for the stock pipe, if only for safety's sake.

 

[talon187]

or you could be like im waiting to install mine untill my bushur fmic goes in. you could do a front mount and install the gm sensor then i used a cap that fit over the intake tube to block it off to vent and then i used a zip tie to make it wouldnt come off

 

[Joe-GSX]

You need to find a proper sized plug for the recirculation hole on the intake pipe, but if you do that, you need to be EXTRA careful to make sure that said plug cannot, repeat CAN NOT, get sucked into the intake stream. You can probably imagine what would happen if a 1" diameter chunk of plastic or metal or whatever you use as a plug fell into the compressor inlet and got eaten by the compressor wheel.

The other option is to purchase a new intake pipe with no recirculation bung. Forced Performance sells an amazing-looking 4" intake pipe (needs a reducer coupler if you're going to a small inlet turbo) or ExtremePSI sells a very nice intake pipe that looks exactly like the Injen intake. It will bolt up to almost any turbo up to big 16g size or so without the need for extra couplers. If you have the funds, I highly recommend going this route as opposed to making a plug for the stock pipe, if only for safety's sake.

Well thanks for answering my Q. I think i'll take your advice and go the safest route.. I really don't think i'd trust a plug that much!

 

[talon187]

you can.. you need one that fits over the hole not in it mine goes over the lip.. so it could never get sucked in ill show you a pic

 

[talon187]

look in my gallery theres a pic in there

 

[talon187]

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[JeffGST]

Or speed desity with something like aem can do it. Maf-t/dsmlink setup is pretty much the best bet if you dont want anything quicker than 10's. Now my buddys are having problems running e85 with dsmlink but thats the 1600cc injectors he is trying to tune.

MAFT+DSMlink is good for much more than 10's.

With DSMlink, once you activate Fake MAF, the GMAF is completely ignored after the switchover point and the ECU calculates duty cycle using the VE Table. There is no limit to the amount of power that can be made with DSMlink.

I ran numerous 10 second passes with E85/1600cc/GMAF/DSMlink combo.