Could you handle more boost after upgrading your MAF?

[Boostian]

I was running a stock AC DelCo MAF and the car ran fine with O2 readings at ~810 at WOT and zero knock. This was at 15-16 PSI.

Installed my LT1 MAF and translator last night and besides the whole car idling and running a little smoother I did a few WOT runs in 3rd and noticed O2's are back up in the 830's with zero KR.

Anyone else get similar readings after install? The translator switches are set up for the 3" MAF (dial #3).

Oh, and it was about 10-15* warmer today also(than last time I tuned).


From my iPhone

 

[earlbrown]

Technacilly it shouldn't matter... In real life the upgrade to the more modern MAFs come with a host of positive side effects that shouldn't be there.

When the translators first came out many many people reported wheelspin knock going away.

 

[Boostian]

Yea I'm never one to grab hold of a placebo effect, only reason I upgraded is to get rid of the weak links before I move to alky (still have to do the IC).

I just found the readings weird today post-install.


From my iPhone

 

[earlbrown]

It can never be bad to change over to a more accurate higher responding sensor. ESP one as important as the MAF.

 

[jasjamz]

Just thinking out loud... If WOT fuel is set to a certain amount, and you lower/restricted the amount of air going in...wouldn't that raise the 02 readings...just think on it...

 

[we4Mateo]

The temp probably has more to do with the higher O2 readings than the MAF. Hot air is less dense so it'll be richer with static wot fuel delivery like your TT chip has assuming the boost level is the same. The stock MAF isn't restrictive enough at 16-17psi to "flow" more at the same boost level with a new MAF. The narrowband is a crap shoot anyway; my car is set up at 10.5:1 AFR and the NB will read anywhere from 730 to 820 at the top of third despite the same actual AFR. The NB tells you "safe enough" but provides no real AFR reading.

 

[Boostian]

The temp probably has more to do with the higher O2 readings than the MAF. Hot air is less dense so it'll be richer with static wot fuel delivery like your TT chip has assuming the boost level is the same. The stock MAF isn't restrictive enough at 16-17psi to "flow" more at the same boost level with a new MAF. The narrowband is a crap shoot anyway; my car is set up at 10.5:1 AFR and the NB will read anywhere from 730 to 820 at the top of third despite the same actual AFR. The NB tells you "safe enough" but provides no real AFR reading.

Yea I follow. I know true tuning with the NB is like doing math with an abacus. With my mods it just doesn't make sense to go WB yet. I've got more learning to do cause my mind, WB is useless for me now w/o logging software and true tuning abilities like an XFI system. And I'm not looking to get into all that yet. My goal is to see how much safe power I can get without alky after I upgrade the IC, then add alky and run conservative with that also.


From my iPhone

 

[we4Mateo]

Yea I follow. I know true tuning with the NB is like doing math with an abacus. With my mods it just doesn't make sense to go WB yet. I've got more learning to do cause my mind, WB is useless for me now w/o logging software and true tuning abilities like an XFI system. And I'm not looking to get into all that yet. My goal is to see how much safe power I can get without alky after I upgrade the IC, then add alky and run conservative with that also.


From my iPhone

I run a WB and Bailey chip now but TT chip before and I never would have nailed my fuel delivery without it. I picked up 40rwhp and 100 lb/ft of rwtq on a dyno with no changes other than adding a wideband and pulling fuel back safely.

 

[HouTX87]

I run a WB and Bailey chip now but TT chip before and I never would have nailed my fuel delivery without it. I picked up 40rwhp and 100 lb/ft of rwtq on a dyno with no changes other than adding a wideband and pulling fuel back safely.

Nice tuning results! With Bailey chip are you referring to a Gen 2 translator setup I'm guessing? I had to go back from a 6.1 chip to a 5.7 TT chip because I haven't had time to sort out issues with my wideband install. Sorry, I don't mean to hijack this thread.

 

[we4Mateo]

Nice tuning results! With Bailey chip are you referring to a Gen 2 translator setup I'm guessing? I had to go back from a 6.1 chip to a 5.7 TT chip because I haven't had time to sort out issues with my wideband install. Sorry, I don't mean to hijack this thread.

Nope, I run an extender chip with old school translator. I love TT chips and I love running an MAF but the extender chips reads airflow at WOT unlike the static fuel delivery in a TT chip at wot. Problem I was having was when I locked my TC, the boost would pick up 3psi. With the TT chip, I was rich with TC open and a little lean with TC locked b/c of the extra flow from 3 extra psi, but fuel delivery was static. Now my AFR is constant at any boost level at WOT as both chip and alky add or take away fuel based upon boost. If it's hot, I turn the translator down to run leaner, if it's cool out, I turn the translator up a notch to deal with the extra air, but I never have to adjust fuel based upon changing my boost level anymore.