Electromaro

i have installed an lt1 into my 87 z28 and i need the ac to work. can anyone give me some advice on how to hook it up. i need the lines to go straight out the back. and i'm not sure how to hook it up to the condenser. are there any factory lines that solve this problem. thanks

TexasLT1

try and find a CarQuest catalog, they have a number of a/c fitting adapters in there that you can turn and use to have the hoses come out pretty much any direction you want them. But did you do an f-body lt1 swap? when I did mine, if the hoses came straight out the back of the compressor, they hit the crossmember in about 3 inches. what swap did you do?

Trans Am#5

Another question is do you have an F-body lt1 or vette lt1? If it's the 'vette one, the compressor is on top and will be much easier to work with.

Electromaro

i have a 97 z28 lt1. will the 3rd gen condenser work, or do i have to get a 4th gen one?

Trans Am#5

I believe a condensor is a condensor. As long as it is 'plumbed' properly, it should work just fine. I bought a new oem condensor for my '87 Trans Am and am going to find some lines to make it connect properly to the Vette Lt1 condensor. I believe it shouldn't be a problem after I find the proper fittings.

Electromaro

right. well that was my concern. if the fittings were different. also i have a questio about fuel delivery. i had a carbuerated lg4. is there an in line pump that i could use so that i wouldn't have to replace the gas tank?

Trans Am#5

You don't have to replace the entire tank. You would just have to add an elctric fuel pump in there to the float assembly. This is what I did and the wiring was already there for it. As for adding an in line....that I can't help you with. All in all, it wasn't that tough. You'll need an extra pair of hands and get the tank as empty as possible. Air tools help also. An Lt1 or even TPI pump will work and if you do decide to go this route, get an oem GM pump. I've read that they are more reliable then the stuff you can get at Autozone or Pep Boys.

bluepastu

I still doing the convertion on my 87 iroc(was 305, auto, carb.d). I found that there is a fuel pump in the tank. I dropped the tank and put in a tpi(not knowing that there was one already in the tank). tip that i can share is that for the power steering pressure line you can use the 95 impala ss line(it goes from the power sterring pump to the stock 87 gear box). works PERFECT! no mods at all. for the fuel lines i moved the in/out-puts hard lines to the center of the fire wall(just above the trans) and used tpi hose and hose clamps to the in/out-lets of the intake. no issues so far.
email if U have any other questions.

i'm looking to do the a/c connections next. what p/n can i use on the line to the a/c pump?

Trans Am#5

Funny you should mention that Blue....I was suprised to also find a pump in my tank and it too was a 4bbl car. A mechanical pump on the block and this one in the tank...I wonder why. Maybe my 305 needed a LOT of fuel

Electromaro

blue: so all i really need is a 3rd gen tpi pump? and it will fit in my carb feeding tank? and the existing stock carb lines will fit on the new pump? then just make a couple feet of lines to go into the intake? what size 6an fitting can i use to connect into the intake?

thanks guys

Zepher

iTrader: (1)

They make -6an to LT1 quick connect adaptors for $40. Makes for an easy connection. I can post some pics tomorrow of the ones we are using on my friends LT1 swap.

on my intake for the feed, I used a -6an to 3/8 compression fitting.
The -6an to 5/16 compression fitting for the return is back ordered from everyone, so I still need to do something about that.

I'll take pics of both setups so you can choose.

bluepastu

Electromaro,

so all i really need is a 3rd gen tpi pump?
-I'm running the 3rg gen tpi pump in mine, i was able to crack the lt1 and put it in gear and no issues. My understanding is that the request by both lt1 or 3rdgen tpi systems is about equal.

and it will fit in my carb feeding tank?
-I went to the GM dealer and used the 3rd gen tpi pump. However when i pulled the tank down, there was all ready one in there(what psi- I don't know). If I had to do it again I'd leave the tank alone, crack the lt1(once everything is connected) and see if the carb pump can hold up, if not then change it to the 3rdgen tpi pump IMO.

and the existing stock carb lines will fit on the new pump?
-Mine did.

then just make a couple feet of lines to go into the intake?
-There are line all ready in the tank that hold the current carb pump.

what size 6an fitting can i use to connect into the intake?
-the stock lines on the car is 3/8 out of the gas tank and into the intake. and 5/16 return from teh intake and back to the gas tank.



Also I had electric leading to the gas tank, which i didn't know until i dropped the tank and found out what i was dealing with.

hope this helps. let me know if I can answer anything else.

bluepastu

TexasLT1

could you post the carquest fittings you used? also which hose lines did you use?

I'm using the lt1 from a 95 impala ss. I'm kinda figuring that the 87 lines will work(there just a bit to long). but maybe the fitting would help in other ideas. LMK thanks

Electromaro

zepher, yeah i'd like to see some pics. thanks

blue, thanks man, that was really helpful. as far as the ac lines, i just got to rig something up somehow. either way i can deal without ac for a while and still drive it.

can anybody give me a rwhp estimate with this setup.
lt1
slp headers w/ a.i.r.
pollution controls kept
underdrive pulley
k&n cold air setup
t-56
spohn cross member and torque arm
limited slip rear w/ 3.73 gears
hotchkins sub frame connectors

Zepher

iTrader: (1)

Here are the 3 styles of fittings,

These two use the stock plastic clips to hold them on,

The ones on the left are for rubber lines with clamps and the ones on the right have -6an male ends.

This is the comression style fitting I am using on my rail,

Zepher

iTrader: (1)

You should be seeing 250-275

TexasLT1

sorry man, I long ago forgot the part number to it. I can tell you what it looks like though, its a steel plate about 1.5" X 4" with two holes in it for the fittings and a smaller hole for a bolt. the fittings are two aluminum L's that are about 3" on each side. You can turn the L's any direction you need them. To connect the lines we took the stock lines, cut the metal fittings off of them and left enough of the hard tube to be able to hose clamp them inside regular rubber hose. The pressure line is now a braided stainless line, however, because after taking it off a couple of times the hose clamps no longer held it onto the fittings, and we kept having it blow off when the system was about 75% pressurized. The new stainless line hasn't had any problems. I'm afraid I don't have and can't get any photos of it, the car is at home and I'm away at school.

Electromaro

does anybody know what to do about the power stearing return line?

TexasLT1

I ended up using part of the existing hard line that runs underneath the radiator support. I cut the line where it loops back towards the steering box and ran a piece of rubber hose from there to the reservoir.

Thirim

return PS line, I used fuel injection pressure rubber line.. It has a bit of braid in it.. They say regular rubber gas line won't take the ATF .. but mine is fine.

five7kid

iTrader: (14)

You do realize this thread is almost 5 years old. . .

Thirim

lmao. I do now. haha

socal

http://www.docsblocks.com/default.asp

http://www.hotrodair.com/

http://www.classicautoair.com/

we used doc's but heres a few

socal

yes very old got me too haha