I recently have been having problems with my single program superchip. it is detonating like crazy at low rpm when its in 3rd or 4th gear. My question is can i run a 4# lower, 90mm mass air, cold air intake, oil breather, boost bypass without the chip. I took out the chip and there was no detonation at all. Can i beat on the truck with out the chip? By the way my Service engine soon light is on because i have a 99L with a 90 mm

 

i ran a 4#er sans chip for a while with no problems. i got one soon after i dynoed it ad saw my a/f. i wasn't too lean, but i was on the tip in, where it can be dangerous if i did detonate. i never did have any audible detonation.

are you running breathers on both sides? if not then running just one would lean you out more becuase of the unmetered air entering throught he breather.

 

Is it possible you just got some bad gas?
Have you tried adding some octane boost?

 

I have been running my 01 with a 4# lower and no chip for well over a year now. No problems whatsoever.

 

there is NO WAY you can run a 4# pulley and a 90m MAF on a '99 lightning without a chip.!!!!!


I did it for a day (installed it at home and drove 1 hour to my tuner) and HE screamed at me for running the 90mm MAF.
it has a different meter then the stock 80mm.

my A/F ratio was in the 13's.
Extremely lean.

The reason your SRS light is on is because you are LEAN, and I mean dangerously lean.

If you don't put a chip in there today you are an idiot if you continue to drive it.

go have someone pull the srs code, I betcha it sas TOO LEAN ON RIGHT AND LEFT BANK...

it's not the pulley you have to worry about it is the maf. the maf and o2 sensors are both used to calculate the a/f ratio, now your maf is all screwed up until you get a chip.

 

yeah, VERY bad idea. I know some people say they've ran a 4lber with no chip, but honestly, dont do it, you will burn something up. I guess technically, if you drove conservative, and never hit boost, you would be ok, but if I were you, I would not take the chance.

 

D00d, some people on here would run an 8# with no chip if someone else told them that they have been doing it for over a year. What they don't tell you is things like:

a. But, I don't drive it every day.
b. But, I hardly go WOT.
c. But, not all stock PCM calibrations are the same -- mine just happend to be really rich in stock trim.
d. But, it's only been running with these mods for 1,000 miles.

etc. etc.

I think just the fact that you have to ask means that you have some sort of clue that this isn't a good idea.

If I jumped off a bridge and lived would you?

Talk to your tuner... please?

--Steele

 

-I race mine with 4# and no chip
-I drive mine every day with 4# and no chip
-I have checked my A/F and it is 12.5:1, same as stock

But mine came with the 90mm maf. On a 99-00, changing the MAF and pulley may be a little dangerous, although I know a couple of people who have done it with no issues.

Not all Ls are exactly the same and may respond differently.

But as far as MY truck.... everythings A-OK

 

12.5:1 is safe?
Your stock PCM calibration was 12.5:1?

Do you have dyno sheets that you can post? Or should we all take your word for it?

--Steele

 

geez, how many times have we been through this...

With factory timing, 12.5:1 is safe... that's how they come from the factory... but when you add a chip, the timing is advanced making a 12.5:1 A/F ratio unsafe so more fuel is added to fatten up the A/F.

 

You're the boss!

 

Don't take my word for it. I am just telling you what I have learned over the past couple of years of Lightning ownership, mainly from people on this board.

I did NOT dyno my truck before I installed the pulley, but several people on here have and have posted thier results, and they have seen A/F ratios in the mid to high 12 range, bone stock.

I DID dyno my truck AFTER the pulley was installed, and mine was also running in the mid 12 A/F range (see pic, sorry poor quality). This means the PCM was doing it's job by adding fuel to compensate for the increased airflow.



But again, I am speaking from what I have learned and from my personal experiences, so take what I say with a grain of salt.

Sammy

 

I ran my truck (2000L) for about a week or so with a 4lb lower, 90mm maf, breathers, efan, etc etc..

It pulled like crazy to 120!
My check engine light came on because of the 90mm MAF, but it didn't detonate.

I've even seen a Lightning run 12's with a bigger pulley & no chip!
That was Sixpipes @ Hallsville Tx.

 

My .02 cent is that you take the MAF off and put your stock one back on there. I think you will be fine then. But your really need to talk to your tuner.

 

I wouldn't say fine, but mch much safer