NAVEAV8

Hi guys, i have on my backyard an LT1 5.7 1999 and LM7 5.3 2003, which will you choose to make an offroad swap (NISSAN 1980 6SPEED MANUAL TRANS 4X4)

i am planning on using the original ecu

what do you think about those engines?
whats the best for you?

Thanks for your responses

sickspeed

I've run several LT1's and right now I have a 94 camaro setup in my wife's 70 camaro and a 5.3 in my 68 firebird and the LT1 camaro runs off and leaves my firebird. It's just a lot torqueier motor, and for off road, that's what you want. Just keep water off that opti-spark.

Irish350

iTrader: (14)

ive had 2 lt1 cars and as much torque as they provide 'off the shelf' i prefer to not deal with the opti/etc if i dont have to. Since theyre both iron it levels the playing field, but i think since the lm7 is part of the ls family youll have a much better time modding it, which i assume youd do (i would if i was doing a nissan swap ... especially on an off road truck )

also, adjusting valves blows

NAVEAV8

THANKS guys, finnally im getting lm7 on it. hope to have not much problems with opti spark, what else do you think about lm7, check out my ride

jonathan_ed3

iTrader: (4)

I like it! Keep us updated.

Pocket

iTrader: (22)

Go with the LM7, it's a much better platform to build up

BTW, thats not a LT1, or even a LTx engine. Its a vortec headed SBC. Notice the conventional location of the distributor. LTx engines moved it forward behind the balancer. Those CPI vortecs were not known for major power

TTLS1GP

iTrader: (10)

+1

the spider injection has it's issues.

That engine looks like ones found in late 90's trucks.

xx_ED_xx

iTrader: (17)

5.3 and i dont even like ls motors

NAVEAV8

finally took out the 6 cyl engine, by now we are fixing some parts and modifing trans and clutch, got some trouble on geting flywheel but finally bougth one of 4.8 engine thats the same for 5.3 and 6.0.

i think will have some new trouble adapting throtlle to a mechanical one and waiting for start it, do you think engine will start with original ECU???? or will have to buy some open ecu like haltech or motech , etc

deuce4935

iTrader: (2)

You need to have original lm7 PCM modified, such as vats turned off and any emissions equipment you don't wanna run. Be sure to keep front O2's turned on.

NAVEAV8

Hi guys, finally we modified all fitment and transmission stuff, so LM7 is on the way. we had to cut a little bit of firewall to make transmission stay in original position. by now our homework is make it run with original ecu, hope to have not much trouble on this, we have sensors and pedal with tac module , take a look, any comment is welcome

NAVEAV8

Hi guys, im having some problems when starting LM7 with original ecu on my 4x4 swap, it seems to be a problem with anti theft system , we are using maf, o2s, and other frequently used sensors, we have injection pulse, spark pulse and when we start it, it runs like 10 sec and then shut down, what do you think is going on? and what should i do? buy an open ecu is not an option right now.

thanks

Pocket

iTrader: (22)

VATS

Find a local tuner and turn it off

Irish350

iTrader: (14)

that

its one of the first things a tuner will do usually

NAVEAV8

Hi guys, in your opinion what would be the correct gas pressure that i must have at the tank pump of this, running the 5.3 LM7 . thanks