I just got a base map for my integra. And it idles horibble.. it revs up and down from 750 to 1200 r's and then shoots down to -500 and dies.. And when i give it gas and bring the rpms up it kina does the same thing and the revs sorta step up.

I was told by the guy who burnt the chip and he said that it was programmed for a GM 3 bar map sensor. My question is should i get a 3 bar map sensor or have him burn me a chip for my stock one?

I have the old chip it used to run when it was originally turbo'ed, before i had it and it runs the car pretty well. I dont have a wide band or anything, but at least i can move it in and out of the garage with a steady idle and i can rev it up just fine.. The wastegate spring is only at 4.5 lbs and i dont plan on going any higher than 6-8 pounds.

Its a OBD1 ls motor in a 92 DB1 integra, tb0356 from a 86 saab 900,2.5 intercooler piping, 3" Down pipe, DSM 450's and a chipped p28.. Stock map and fuel pump.

all help is appreciated!

eric

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Alpinestar03 &raquo;</TD></TR><TR><TD CLASS="quote">I was told by the guy who burnt the chip and he said that it was programmed for a GM 3 bar map sensor. My question is should i get a 3 bar map sensor or have him burn me a chip for my stock one? </TD></TR></TABLE>

well right now you need either or. If you buy a 3bar then that solves the problem plus you can use it in the future.

 

If the rom was made for a 3 bar map sensor, you must run it on a 3 bar map sensor

 

I understand that if it was programed for a 3 bar map sensor id need to run a 3 bar sensor.

but isnt my stock map sensor good up to like 12 pounds of boost? I dont plan on going much higher then what my wastegate spring is set at, which is 4.5 pounds.

Id hate to waste the money on something i dont need in stead of replacing my leaky oil pan or to save up for a wideband..

The fishy thing is, that my friend told the tuner that my setup was almost completly stock besides the dsm 450's. So im thinking that he programmed it for a gm 3bar, knowing it wouldnt run right with my stock map sensor so id HAVE TO buy one from him so hed make some more money off me... IDK i just dont trust people who i havent done business with.

I think i should have just gone through pherable..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Alpinestar03 &raquo;</TD></TR><TR><TD CLASS="quote">I understand that if it was programed for a 3 bar map sensor id need to run a 3 bar sensor.

but isnt my stock map sensor good up to like 12 pounds of boost? I dont plan on going much higher then what my wastegate spring is set at, which is 4.5 pounds.

</TD></TR></TABLE>

the resolution between the 2 are different. meaning 2.5 volts on the stock map doesnt = the map reading of 2.5 volts on the 3 bar.

you need to run the map sensor that the ecu is chipped for.

also is it a base map? or is it a decent chip someone put some thought into?

if it is a base map, it is just good enough to get you to the dyno and have it properly tuned.

 

oh, i know that i shouldnt run around on a base map.. I just need to get the car running so i can drive it to my girlfriends fathers body shop so i can start doing some cosmetic surgery..
I know the importance of having a poperly tuned FI setup. They guy who burnt me the base map does dyno tuning on a Mustang Dyno and will be doing a street tune for me once i get a wide band and more money.. I just need to drive it about 8 miles to the body shop.

I understand that the resolution is diffrent between the stock map sensor and the 3 bar, and that makes it run bad the way it sits. im just worndering if i should have him burn me another chip for my stock map sensor or if i should get a gm 3 bar. I dont see why i would need one that can take 44lbs of boost when my stock one can hanlde the smaller boost levels that im going to be running..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Alpinestar03 &raquo;</TD></TR><TR><TD CLASS="quote">I understand that if it was programed for a 3 bar map sensor id need to run a 3 bar sensor.

but isnt my stock map sensor good up to like 12 pounds of boost? I dont plan on going much higher then what my wastegate spring is set at, which is 4.5 pounds.

Id hate to waste the money on something i dont need in stead of replacing my leaky oil pan or to save up for a wideband..

The fishy thing is, that my friend told the tuner that my setup was almost completly stock besides the dsm 450's. So im thinking that he programmed it for a gm 3bar, knowing it wouldnt run right with my stock map sensor so id HAVE TO buy one from him so hed make some more money off me... IDK i just dont trust people who i havent done business with.

I think i should have just gone through pherable.. </TD></TR></TABLE>

also realistically if your using a stock map sensor when your tuner tunes the car they will have to put your boost cut at 10psi because the map sensor can't see 11psi, so you will probably be running 9psi. I would advise just getting a 3bar. If you really didnt want to do that just get a map that haas a stock sensor on it, but you can't run 12psi

 

yea, im only looking to run 4-6 pounds tops.. Im not looking to make more than 180-200 chp.

 

then get a stock map sensor map.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Alpinestar03 &raquo;</TD></TR><TR><TD CLASS="quote"> I dont see why i would need one that can take 44lbs of boost when my stock one can hanlde the smaller boost levels that im going to be running.. </TD></TR></TABLE>

nope........
3 bar = 14.7x3 = 44.1 - atmospheric pressure netting 28-29 psi

 

If you run a 1.75bar (stock) with a tune for a 3bar, and especially one with closed-loop disabled (O2 correction), your EMS will try to squirt 71% more fuel than is needed. At idle, it normally sees about 20" Hg vacuum, but with the 3bar, it thinks its at 13.6" Hg vacuum - and dump that much more fuel.

If you only need to get to someone's shop and WILL NOT boost, but have the same injector size as the last tune, you can use that old chip. The motor will be far more resistant to damage when you drive it like a granny in vacuum.

BTW on a gauge, 0psi is 14.5psi absolute. That what ManafoldAbsolutePressure sensors read as. They output as a 0-5v signal, which is why a 3bar on an ems expecting 1.75bar won't run well.

 

Be safe.

Either spend the money on the 3Bar and get the car running right, or spend the money to have it towed to the body shop. Don't drive it until it is proper.

Craig

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My tuner is gonna re burn me a new chip for my stock map sensor.. Thanks for all the help!!