red02Hawk

iTrader: (9)

ok i picked up one of my copies of gmhtp the other day and i noticed an article where they swapped a gen IV crate motor in a 2001 z28. They didn't use the the map sensor on the front of the intake, instead they used the vacuum port on the rear of the intake. My question is if the computer is getting a full overhaul tune anyways, cant i use the map sensor at the front of the intake and just adjust the values??

sroach20

iTrader: (31)

it would be fine, i had to move mine to the front and retune.

fbam

iTrader: (1)

Why do you need to retune? What would be the result if you didn't retune?

sroach20

iTrader: (31)

dont know if it makes a difference front or back. i had to redo mine because i went from a stock lq4 to an l92/ls3 setup.

Mike454SS

iTrader: (4)

You need to re-tune the engine because it's a different engine...they're both 1-bar MAP sensors...their calibration is the same.

red02Hawk

iTrader: (9)

ok, so the census here is that its the same MAP sensor, i mean it does have the same part# on it, but it is in a different location so the values it will read will be different than if it were located in the back of the intake? Just trying to figure out why GMHTP would go through all the trouble to put another sensor on the rear of the intake when you have a perfectly good one on the front.

sroach20

iTrader: (31)

you have the same map, the ls3 uses the different one.

fbam

iTrader: (1)

OK, so am I an idiot for using sensor safe silicone and putting my ls1 map sensor in the front of the manifold?

sroach20

iTrader: (31)

which intake did you use, ls3 or l76?

fbam

iTrader: (1)

I have an ls3 manifold. The sensor almost fit but not quite, so I used some silicone to ensure it wouldn't leak...at least I hope it wont.

sroach20

iTrader: (31)

do like i did this: get an ls3 map sensor and pigtail from the dealer, you can get a 5mm bolt from lowes or home depot to hold it down. the only difference in the wiring is for the outer wires, they just swap around and the center one stays put.
https://ls1tech.com/forums/generatio...ap-sensor.html