Installed MAF Translator. Spool time unchanged, and fuel cut?

[Dan2]

I have a 92 TSI AWD with a Big16G w/ 6cm housing, stock SMIC, stock lower IC pipe, stock intake, hard upper IC pipe & bigger t-body elbow, larger compressor outlet, full 3" exhaust from DP to tailpipe (TR&D catback) with a test pipe and an Evo manifold. No porting anywhere. Stock injectors, no AFC, 255 lph fuel pump.

I took off my slightly hacked 1G MAS today and installed the MAF Translator along with a 3" LT1 MAF right onto the stock intake, everything set to 0 on the dials (I am sure I set all the dip switches correctly). It has a honeycomb but I ran it without an air filter to test it out. I have a Profec B to control the boost, set about to the middle on the "Balance" knob.

I expected a major drop in spool time but I didn't really notice one (I did a 2nd gear punch test and a 4th@55 MPH test, and they appeared almost exactly the same as with the MAS). The BOV, turbo, and intake are significantly louder and it appeared to pull a bit harder. It definitely seemed to launch a bit harder unless I got lucky on that one, and it seemed to spool a little faster between gears. I know the turbo will spool faster when I put a hard intake and lower IC pipe, but after reading "750 RPMs sooner", I was somewhat disappointed that it didn't make a significant difference.

I also hit what appeared to be fuel cut, but I think it was my injectors maxing out; does this sound possible? I don't know if it feels like fuel cut, but anyway I was running 19 PSI w/ stock 450cc injectors on a Big16G -- pretty dumb eh? Datalogger read 24 ms pulse cycle (about a 120%+ duty cycle I think) -- guess it's time to install my 550s. I was running about 96 octane (mix 91/100) and saw no knock, good timing on the logger.

One other thing I noticed -- the throttle-lift surge (where most turbo cars lunge forward off the throttle) is much more noticeable now.

 

[$lacker]

I believe the drastic improvement in spool time generally comes from people that have been running an AFC to tune, which has rpm based tuning and can flood the car at WOT while trying to spool

 

[Dan2]

What about the apparent fuel cut? Is it the injectors?


I'll install the AFC soon too

 

[Silent2g]

you need some injectors!

 

[GSX4LIFE]

#1, you have a 6cm B16G. How much faster do you want ot spool??? If your not seeing full boost by 3300rpm with the stock setup, your tuning, engine, turbo are to blame. Dont expect another 750rpm with such a small turbo. #2, you absolutely need injectors. If you were infact running at 120% duty cycle, your beyond maxed out. At 100% your injectors are fully static(open). Get the 550s, and tune it correctly. I would say you should be able to pick up 100-200rpm quicker spool. Perhaps, being able to hit full boost at or jsut under 3000rpm. Honestly, if you need to spool quicker than that, get a 14B.

 

[Tallen]

you will get quicker spool mostly by being rid of the stock MAS and MAS tube...

 

[Ramchargers]

You certainly have tuning issues. If you need help call me 888 293 7267
Mike Licht
ramchagers

 

[Dan2]

Just curious but what kind of tuning issues could I have? I am running no AFC yet, stock injectors, stock longblock, stock timing, etc. There isn't much to tune. I know my car isn't knocking, timing advance is good, and I'm only running ~15-17 PSI with about 96 octane gas.

Until I install the injectors and AFC I shouldn't worry about it, I suppose. I'll check for boost leaks tomorrow. Thanks for all the replies so far.

 

[Ramchargers]

With the translator installed you have tuning power just as if yu did have an AFC. Do you have some sort of logger? you need one
Mike

 

[Dan2]

Originally posted by Ramchargers
With the translator installed you have tuning power just as if yu did have an AFC. Do you have some sort of logger? you need one
Mike

Well I don't think it's a good idea to turn up (or down) the fuel with stock injectors. Once I get them that's a different story, but for now there isn't anything to tune.

As I mentioned earlier, I have a datalogger (Pocketlogger to be exact) and I said I have 20 degrees timing advance and 0 knock through 1st->4th gear pulls. The base timing is set correctly. I might have some boost leaks so I will look into that tonight.

 

[L2RTSiAWD]

As others have said you abslutley need injectors.

 

[Dan2]

I know. I'm ordering some ASAP

 

[nine5raptor]

Originally posted by Dan2


Well I don't think it's a good idea to turn up (or down) the fuel with stock injectors.

tuning with stock injectors is just like tuning with any other injectors, you just have a different base setting.

My car has really woken up with the maft. I have only done a little bit so far, but how does 15 psi, 12 deg timing, with at least 5 psi by 2500 sound, compared to 13 psi, 6 deg timing, and 5 psi at 3200? My car is so much more fun to drive now

I just needed to lean it out a bit (with stock injectors) btw 02's are still .94-.96

 

[Turbo Lag]

Originally posted by Dan2


One other thing I noticed -- the throttle-lift surge (where most turbo cars lunge forward off the throttle) is much more noticeable now.

Now that I have the translator installed the throttle surge is horrible when I press down or release the throttle at mid to high rpm. Is there any way to rectify this?

 

[Tallen]

Originally posted by Turbo Lag


Now that I have the translator installed the throttle surge is horrible when I press down or release the throttle at mid to high rpm. Is there any way to rectify this?

tune it...got rid of mine via a few datalogs. if youy dont have any way to log data...well jsut guess

 

[MaxBoost]

I'm getting major lift surge as well. Can't seem to eliminate through tuning, but I need a little more practice I guess. I am seeing 5psi at just over 2000rpm with a big 16g though. And fairly sure that Im still hitting fuel cut with the defense switch set to on. I know there are some intake leaks and I need injectors badly. Some 660s and a logger are on the way. Overall Im pleased. I nice benefit is painless removal of the MAFT flilter combo to do other shstuff.
That stock 1g excuse for a MAS was giving me a headache.

 

[Tallen]

are you using the 3" MAF? if so try switching the switch to the 3.5" setting....then reset everything to zero and start over

 

[JayHass]

That 750rpm number came from a STOCK MAF/intake tube to a MAFT installation.

Just like we notice a nice increase in boost response from a hacked aircan, silencer removal and hacked MAS you get the same results by removing all that and sticking a MAFT on, only a little bit more.

On a car with all the "free" mods done, don't expect 750rpm IMO. Maybe a couple hundred rpm at best.

 

[MaxBoost]

I was able to eliminate my throttle lift surge problem. Leaning out the base mid and high did it for me even with stock injectors! The sad thing is I thought clockwise leaned things out on the mid and high dials. Spool time is shorter now Hope that pocketlogger gets here soon. Shouldve read the manual!:laugh:

 

[Turbo Lag]

Originally posted by JayHass
That 750rpm number came from a STOCK MAF/intake tube to a MAFT installation.

I had a stock setup on my car before installing the MAFT. My car spools up at least 600 rpm sooner after the install. Crusing at 2000 rpm in 5th gear and punching it, I'm at 18psi at 2900 RPM. Gigantic improvement. Just need to get rid of that throttle surge now.

 

[MaxBoost]

Id really like to know why Im hitting fuel cut with the MAFT defense switch on when my car is tuned well with no knock and good trims, etc. I havent put in my new injectors yet, but you shouldnt need to with a product that advertises less/no fuel cut. This product is awesome, but Im not so sure it is a way to avoid fuel cut with stock injectors.

I just wanted to ad that customer service is very good from Ramchargers.

 

[EvoSix]

There's an update being released. I'm not sure on the details but its on the yahoo group. I was also getting fuel cut when i had dip switch 3 "on." Turning it off seemed to put back things to normal.

 

[Dan2]

Think it's safe to lean the high throttle by 5% or so on stock injectors? I figure that way the car wouldn't be as rich and it wouldn't be pushing the injectors as hard. I would of course check it w/ datalogger, but just curious what you guys think...

I want to make the turbo spool faster and get rid of the throttle lift surge, but when someone says "tune it" that's not specific enough for me. What's causing these conditions -- running too rich maybe?

Thanks.

 

[nine5raptor]

im running -10% mid -10% wot and +20% idle on stock injectors. these give me the best #'s on the PL

 

[Dan2]

nine5raptor: I tried those settings and they seemed to help. The P/W is down on the injectors, and the O2 seems fine (.88-.90). Fuel trim Hi still reads 81%... which is rich, right?

Stock injectors and -10%... but the fuel trim still says 81%. How could it still be that rich?