5.0 IROC Z lsx swap
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Posts: 2,042
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From: So Cal
Car: 87 IROC-Z
Engine: LsX
Transmission: MN12 6speed
Axle/Gears: 3:42
5.0 IROC Z lsx swap
just another lsx swap that ill be finishing up. should be completed within time
1989 irocz tgo member 5.0 IROC Z
02 ls1 engine with 50k miles
complete pull out with all accessories in place.
90 fast intake and matched TB
243 heads (take offs)
VRX4 comp cam springs
katech timing chain
t56 fbody transmission
MGW billet shifter
4th gen t56 pedals and hydraulics
LS7 clutch kit
SPOHN LSx motor and tranny mounts
01 fbody manifolds
slp Powerflow exhaust kit !!
4th gen dual fans
summit aluminum radiator
4th gen power steering cooler
4th gen tb cable non tcs
4th gen fuel tank and 255lph walbro
02 camaro ebony dashboard
fully functional 4th gen cluster
hvac system will be coming along fully functional heater and air conditioning
the car sits on 18" black c5 z06 wheels
supported with koni yellows, sport line coils
heres the car


1989 irocz tgo member 5.0 IROC Z
02 ls1 engine with 50k miles
complete pull out with all accessories in place.
90 fast intake and matched TB
243 heads (take offs)
VRX4 comp cam springs
katech timing chain
t56 fbody transmission
MGW billet shifter
4th gen t56 pedals and hydraulics
LS7 clutch kit
SPOHN LSx motor and tranny mounts
01 fbody manifolds
slp Powerflow exhaust kit !!
4th gen dual fans
summit aluminum radiator
4th gen power steering cooler
4th gen tb cable non tcs
4th gen fuel tank and 255lph walbro
02 camaro ebony dashboard
fully functional 4th gen cluster
hvac system will be coming along fully functional heater and air conditioning
the car sits on 18" black c5 z06 wheels
supported with koni yellows, sport line coils
heres the car


Last edited by TPI TERR; Jul 2, 2011 at 12:22 AM.
Thread Starter
On Probation
iTrader: (9)
Joined: Feb 2005
Posts: 2,042
Likes: 2
From: So Cal
Car: 87 IROC-Z
Engine: LsX
Transmission: MN12 6speed
Axle/Gears: 3:42
Re: another lsx swap



k member will be notched for the ac.
well be adding a plate by the master cylinder area. (the car is originally auto)
well be looking for small parts along the way
more to come soon
Last edited by TPI TERR; Jun 28, 2011 at 12:48 AM.
Joined: Dec 2008
Posts: 2,540
Likes: 0
From: Norwalk, CA
Car: 91Z28
Engine: 5.7 ls1
Transmission: 4l60e
Axle/Gears: 3.42
Re: another lsx swap
Wow it's gonna look nice just like yours, you guys have a third gen crew were you live since I see your car and another one in the back.
Senior Member
Joined: Aug 2006
Posts: 807
Likes: 2
From: Ontario, Canada
Car: 1991 Trans Am GTA
Engine: LSX (swapping)
Transmission: 4L60E (swapping)
Axle/Gears: 2.73 Posi 10 Bolt
Re: another lsx swap
You have so many nice 3rd gens in your area! I love the white with black wheels!
Thread Starter
On Probation
iTrader: (9)
Joined: Feb 2005
Posts: 2,042
Likes: 2
From: So Cal
Car: 87 IROC-Z
Engine: LsX
Transmission: MN12 6speed
Axle/Gears: 3:42
Re: another lsx swap
yea its gonna be a fun car.. ill have to test drive it from time to time make sure its running properly.
Trending Topics
Junior Member
Joined: Jul 2009
Posts: 47
Likes: 0
From: Germantown, TN
Car: 1986 IROC-Z
Engine: LS2
Transmission: T56
Axle/Gears: 3.23
Re: another lsx swap
Is the A/C system operational? If so, how did you wire it/make it work? Just had an '05 GTO LS2 installed in my '06 IROC. The shop tells me that they won't be able to get the A/C working properly.
I accidently erased their email to me, but it was something about how the computer turned on the compressor. I've got the compressor to work but I had to jumper the high pressure switch plug. They're using the 3rd gen two pin switch. I've read the 4th gen three pin high pressure switch needs to be used. They've also told me that they talked to Hawk's and Hawk's said they don't know of anyone having a working LS2 A/C system in a 3rd gen car.
Getting cruise to work in a DBW system is another issue I'm not giving up on.
Any help in these problems would be appreciated. Thank you.
I accidently erased their email to me, but it was something about how the computer turned on the compressor. I've got the compressor to work but I had to jumper the high pressure switch plug. They're using the 3rd gen two pin switch. I've read the 4th gen three pin high pressure switch needs to be used. They've also told me that they talked to Hawk's and Hawk's said they don't know of anyone having a working LS2 A/C system in a 3rd gen car.
Getting cruise to work in a DBW system is another issue I'm not giving up on.
Any help in these problems would be appreciated. Thank you.
Thread Starter
On Probation
iTrader: (9)
Joined: Feb 2005
Posts: 2,042
Likes: 2
From: So Cal
Car: 87 IROC-Z
Engine: LsX
Transmission: MN12 6speed
Axle/Gears: 3:42
Re: another lsx swap
Chill e. Yes my a/c is operating correctly..but I feel like my high pressure switch isn't working properly..Anyways I'm not too sure on the ls2 or dbw. I'm working with the ls1 set up and ecms are completely different if I got the ls1 compressor to work I'm sure the pin lay out on the ls2 etc is similar and can get anycompressor to kick .
Last edited by TPI TERR; Sep 21, 2010 at 04:15 PM.
Joined: Dec 1999
Posts: 3,544
Likes: 19
From: WI,USA
Car: 89 FORMULA 350, 91 Z28 Convertible
Engine: ls1, LB9
Transmission: t56, Auto
Axle/Gears: S60/ 3.73
Re: another lsx swap
Is the A/C system operational? If so, how did you wire it/make it work? Just had an '05 GTO LS2 installed in my '06 IROC. The shop tells me that they won't be able to get the A/C working properly.
I accidently erased their email to me, but it was something about how the computer turned on the compressor. I've got the compressor to work but I had to jumper the high pressure switch plug. They're using the 3rd gen two pin switch. I've read the 4th gen three pin high pressure switch needs to be used. They've also told me that they talked to Hawk's and Hawk's said they don't know of anyone having a working LS2 A/C system in a 3rd gen car.
Getting cruise to work in a DBW system is another issue I'm not giving up on.
Any help in these problems would be appreciated. Thank you.
I accidently erased their email to me, but it was something about how the computer turned on the compressor. I've got the compressor to work but I had to jumper the high pressure switch plug. They're using the 3rd gen two pin switch. I've read the 4th gen three pin high pressure switch needs to be used. They've also told me that they talked to Hawk's and Hawk's said they don't know of anyone having a working LS2 A/C system in a 3rd gen car.
Getting cruise to work in a DBW system is another issue I'm not giving up on.
Any help in these problems would be appreciated. Thank you.
its not hard to do at all!
did they swap in the eng harness and leave the ls2 a/c ends? (psi sensor and a/c clutch pigtail) since the its a ls2 a/c did you have the bcm installed too?
Last edited by 88 350 tpi formula; Sep 21, 2010 at 07:44 PM.
Junior Member
Joined: Jul 2009
Posts: 47
Likes: 0
From: Germantown, TN
Car: 1986 IROC-Z
Engine: LS2
Transmission: T56
Axle/Gears: 3.23
Re: another lsx swap
They had to get/make another set of wires for the high press sensor. They said they wired it exactly like a 2000 Camaro system, but it wouldn't kick on the a/c compressor at all. Then they reinstalled the 3rd gen high press sensor. The a/c kicks on but then goes off; acting like there's not enough freon. A friend of mine checked freon and found that the condensor (new 3rd gen) seems to be hot. He cooled it off with water and pressures were good. We're thinking I may need to get a fan on the front side to help keep it cool. This and re-installing the 4th gen high press switch will hopefully do the trick. Oh yeah, the bcm was not installed. Anyone have any thoughts?
Member




Joined: Jul 2002
Posts: 255
Likes: 9
From: Humid Houston on the Texas coast
Car: '86 Z28
Engine: SDPC TPI 350
Transmission: WC T5
Axle/Gears: 3.23 posi
Re: another lsx swap
They had to get/make another set of wires for the high press sensor. They said they wired it exactly like a 2000 Camaro system, but it wouldn't kick on the a/c compressor at all. Then they reinstalled the 3rd gen high press sensor. The a/c kicks on but then goes off; acting like there's not enough freon. A friend of mine checked freon and found that the condensor (new 3rd gen) seems to be hot. He cooled it off with water and pressures were good. We're thinking I may need to get a fan on the front side to help keep it cool. This and re-installing the 4th gen high press switch will hopefully do the trick. Oh yeah, the bcm was not installed. Anyone have any thoughts?
the A/C Request comes to it via the BCM. Unfortunately from what what I have researched the BCM talks to the PCM in GM HSLAN via the PIM. Which means there is a need for the PassKey transmitting key and all that module synching BS. I am running into these exact same limitations in planning my LS2 swap.
Mike
Thread Starter
On Probation
iTrader: (9)
Joined: Feb 2005
Posts: 2,042
Likes: 2
From: So Cal
Car: 87 IROC-Z
Engine: LsX
Transmission: MN12 6speed
Axle/Gears: 3:42
Re: another lsx swap
They had to get/make another set of wires for the high press sensor. They said they wired it exactly like a 2000 Camaro system, but it wouldn't kick on the a/c compressor at all. Then they reinstalled the 3rd gen high press sensor. The a/c kicks on but then goes off; acting like there's not enough freon. A friend of mine checked freon and found that the condensor (new 3rd gen) seems to be hot. He cooled it off with water and pressures were good. We're thinking I may need to get a fan on the front side to help keep it cool. This and re-installing the 4th gen high press switch will hopefully do the trick. Oh yeah, the bcm was not installed. Anyone have any thoughts?
Last edited by TPI TERR; Sep 29, 2010 at 02:00 PM.
Thread Starter
On Probation
iTrader: (9)
Joined: Feb 2005
Posts: 2,042
Likes: 2
From: So Cal
Car: 87 IROC-Z
Engine: LsX
Transmission: MN12 6speed
Axle/Gears: 3:42
Re: another lsx swap
a bit off track were looking for a t56 bellhousing etc for the project. engine has been awaiting with the mounts. were planning on taking out the old dash and test fitting the 4th gen dash.
but anyone aware of lt1wiring.com are they still in business or what?
but anyone aware of lt1wiring.com are they still in business or what?
Thread Starter
On Probation
iTrader: (9)
Joined: Feb 2005
Posts: 2,042
Likes: 2
From: So Cal
Car: 87 IROC-Z
Engine: LsX
Transmission: MN12 6speed
Axle/Gears: 3:42
Re: another lsx swap
harness was bought off of tgo member pocket. quality stuff!! looks really good.
ls7 clutch kit off the typical deals on the ls1tech sponsor sales along with the bell housing.
aluminum radiator and all the nice 6an fittings for the fuel are awaiting.
t56 tranny and shifter was recently purchased.
the only things i need as of now are t5 pedals a lot better than the t56 pedals.
t56 torque arm mount that goes in the back .
clutch master cylinder assembly with reservoir.
everything is going to be assembled in one piece. the day its ready to go i will be pulling out the stock tpi. as of now i am parting out a 01 ws6 which will supply me with much of the wiring that is necessary for this project to be done right and look right. pin for the cluster gauges, headlight switch, h vac controllers, evap, and most importantly the fuel pump wiring.
hes excited to drive this car with the new motor. hes stepping up to some real power


ls7 clutch kit off the typical deals on the ls1tech sponsor sales along with the bell housing.
aluminum radiator and all the nice 6an fittings for the fuel are awaiting.
t56 tranny and shifter was recently purchased.
the only things i need as of now are t5 pedals a lot better than the t56 pedals.
t56 torque arm mount that goes in the back .
clutch master cylinder assembly with reservoir.
everything is going to be assembled in one piece. the day its ready to go i will be pulling out the stock tpi. as of now i am parting out a 01 ws6 which will supply me with much of the wiring that is necessary for this project to be done right and look right. pin for the cluster gauges, headlight switch, h vac controllers, evap, and most importantly the fuel pump wiring.
hes excited to drive this car with the new motor. hes stepping up to some real power


Joined: Dec 2008
Posts: 2,540
Likes: 0
From: Norwalk, CA
Car: 91Z28
Engine: 5.7 ls1
Transmission: 4l60e
Axle/Gears: 3.42
Re: another lsx swap
Nice i really like following your threads man love the lsx swaps im probably gonna ask u within a year to do one for me too lol.
Senior Member
iTrader: (2)
Joined: Jan 2007
Posts: 733
Likes: 1
From: jackson new jersey
Car: 1991 camaro vert
Engine: ls1 soon
Transmission: t56 soon
Axle/Gears: moser 12bolt 4.10 soon!
Re: another lsx swap
U should open a shop man lol lsx swap shop! Lol depending on where I'm stationed in the next year or so I might have u do one for me to lol
Thread Starter
On Probation
iTrader: (9)
Joined: Feb 2005
Posts: 2,042
Likes: 2
From: So Cal
Car: 87 IROC-Z
Engine: LsX
Transmission: MN12 6speed
Axle/Gears: 3:42
Re: another lsx swap
Haven't had much time but we have the motor assembled. He practically bought every sensor and misc parts that were missing.
Last edited by TPI TERR; Jun 28, 2011 at 12:23 AM.
Member
Joined: Aug 2006
Posts: 169
Likes: 0
From: Gällivare Sweden
Car: 1989 Iroc
Engine: LS2
Transmission: GTO T-56
Axle/Gears: 4:th gen Auburn with 3:73
Re: another lsx swap
That car is gonna be super nice. How does the firewall plate that youre intalling to prevent firewall flex look like? And do you mount it on the inside och outside of the firewall? I made one for my car out of 2mm thick aluminum, and mounted it on the inside of the firewall. My plate is approx 7x3,5". But I´m not sure if it´s doing anything to prevent it from flexing ;-)
Cool with those black wheels. I actually ordered wheels just like that from Toms Wheels 5 years ago in 18 all around, but they got them damaged, so I ordered the chome versions instead, otherwise my white -89 would have looked almost exactly like that.
So what do yuou think. I will be in California in between July 25-aug 5:th, will there be any 3:rd gen stuff going on?
Cool with those black wheels. I actually ordered wheels just like that from Toms Wheels 5 years ago in 18 all around, but they got them damaged, so I ordered the chome versions instead, otherwise my white -89 would have looked almost exactly like that.
So what do yuou think. I will be in California in between July 25-aug 5:th, will there be any 3:rd gen stuff going on?
Thread Starter
On Probation
iTrader: (9)
Joined: Feb 2005
Posts: 2,042
Likes: 2
From: So Cal
Car: 87 IROC-Z
Engine: LsX
Transmission: MN12 6speed
Axle/Gears: 3:42
Re: another lsx swap
to do list:
degree cam
install harmonic balancer pulley
notch and extra k member for oil pan clearance and a/c area
mount engine on k member
install transmission onto engine
pull out tpi engine and trans
sell the mighty tpi and bolt ons
route fuel lines
install fuel pump 255walbro/ modify lines
prep engine bay for paint
install all accessories cai
lay out the harness
pull out 3rd gen dash and get started on 4th gen dash!!
buy/ fabricate egr block offs x 2
reinforcement plate for firewall
exhaust & dyno tune
to buy list:
buy pcv rear line * any one have a gm oem p/n??
catch can
autometer fitting for water temp gauge pn 2277 & pn 2259
1/8 fitting for oil pressure sending unit
y pipe merge
buy 1/8 shim for clutch
rear section of slp lm1
distribution power blocks
and thats about it. everything else is in tact and awaiting
degree cam
install harmonic balancer pulley
notch and extra k member for oil pan clearance and a/c area
mount engine on k member
install transmission onto engine
pull out tpi engine and trans
sell the mighty tpi and bolt ons
route fuel lines
install fuel pump 255walbro/ modify lines
prep engine bay for paint
install all accessories cai
lay out the harness
pull out 3rd gen dash and get started on 4th gen dash!!
buy/ fabricate egr block offs x 2
reinforcement plate for firewall
exhaust & dyno tune
to buy list:
buy pcv rear line * any one have a gm oem p/n??
catch can
autometer fitting for water temp gauge pn 2277 & pn 2259
1/8 fitting for oil pressure sending unit
y pipe merge
buy 1/8 shim for clutch
rear section of slp lm1
distribution power blocks
and thats about it. everything else is in tact and awaiting
Thread Starter
On Probation
iTrader: (9)
Joined: Feb 2005
Posts: 2,042
Likes: 2
From: So Cal
Car: 87 IROC-Z
Engine: LsX
Transmission: MN12 6speed
Axle/Gears: 3:42
Re: another lsx swap
summit radiator * need block off plugs

re do evap line

re do pcv

finish prepping the fast intake for paint

re do evap line

re do pcv

finish prepping the fast intake for paint
Thread Starter
On Probation
iTrader: (9)
Joined: Feb 2005
Posts: 2,042
Likes: 2
From: So Cal
Car: 87 IROC-Z
Engine: LsX
Transmission: MN12 6speed
Axle/Gears: 3:42
Re: 5.0 IROC Z lsx swap
i rarely post on this but i got a lot of emails and pm.
owner of the car has been having fun with the swap. brakes and diff are next.
few months and hasnt ran into issues.


owner of the car has been having fun with the swap. brakes and diff are next.
few months and hasnt ran into issues.

Thread Starter
On Probation
iTrader: (9)
Joined: Feb 2005
Posts: 2,042
Likes: 2
From: So Cal
Car: 87 IROC-Z
Engine: LsX
Transmission: MN12 6speed
Axle/Gears: 3:42
Thread Starter
On Probation
iTrader: (9)
Joined: Feb 2005
Posts: 2,042
Likes: 2
From: So Cal
Car: 87 IROC-Z
Engine: LsX
Transmission: MN12 6speed
Axle/Gears: 3:42
Member
iTrader: (1)
Joined: Aug 2010
Posts: 486
Likes: 0
From: MD
Car: 88 Iroc-z
Engine: ls1
Transmission: t56
Axle/Gears: 3.42
Re: another lsx swap
Thread Starter
On Probation
iTrader: (9)
Joined: Feb 2005
Posts: 2,042
Likes: 2
From: So Cal
Car: 87 IROC-Z
Engine: LsX
Transmission: MN12 6speed
Axle/Gears: 3:42
Re: 5.0 IROC Z lsx swap
Forgot bout this thread
Small clip at initial start up no tune

Been a few months since it got tuned . Running strong no issues .
Car needs some gears . Need to get better pics when the owner has a chance .

Just finished up some work on another ls powered iroc last month
Small cam headers 4g dash & cluster t56 nice lil project
Small clip at initial start up no tune

Been a few months since it got tuned . Running strong no issues .
Car needs some gears . Need to get better pics when the owner has a chance .

Just finished up some work on another ls powered iroc last month
Small cam headers 4g dash & cluster t56 nice lil project
Last edited by TPI TERR; Dec 10, 2012 at 02:40 AM.
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