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1988 Grand Prix 2.8 to 3100 swap


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Posted

Actually, I have a 3100 from a '00 Malibu.

Is there a whole lot of difference between the two motors?

 

shouldn't be, they are both N-bodies of the same generation...

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Posted

Actually, I have a 3100 from a '00 Malibu.

Is there a whole lot of difference between the two motors?

oops! info is still the same.

Posted

It is if I want too.

 

I have taken enough crap about my car from another guy on the 660 forums. If you dont have any constructive advice or suggestions, please don't reply.

 

Thank you.

Posted

that is a kinda down on heels car....

 

 

 

but, i see alot of issues to worry about...

 

you do have the better rear EXHAUST manifold. You could grab a dowpipe from a 97and up Gen 1 or 1.5W...

 

EGR: you need to make or use an adapter to allow you to use the OBD1 EGR (unless you are going OBDII?)

PS pump: I don't think it will swap, you may need to get one from a 3100

coolant bypass pipe it missing, you need it.

Alternator: could go either way. either get and use a 3100 one and the 3100 bracket, which will require changing the alternator plug (not hard) or use your 2.8 alt and it;s bracket, it is will mount up, which it may.

 

 

Posted

I got a new style alt on my LG5.

 

the old ones are not worth putting back on your car.

Posted

Actually, the car has a brand new alternator. The previous owner needed a heavy duty one for his sound system.

Posted

Oh BTW,

Will my 2.8L exhaust manifolds fit the 3100? I would really like to use the stock exhaust location.

I've heard that I would have to have a exhaust shop custom fab a downpipe if I used the 3100 manifolds. I want to stay away from that if possible.

 

Yes, you can use your 2.8 manifolds if you want. I used the TGP manifolds on my 3400 heads. Just takes a little time with a carbide burr and a die grinder. They will bolt right up, the exhaust port shape changed to a D shape from circular which is what you need to grind. Here's mine, hogged out.

 

ry%3D480

See if you can find which one I started on one upside down... :redface:

Posted

Personally I would use the newer manifolds, they were made for that motor. Maybe I missed something but why would you need custom manifold/downpipe to use the 3100 ones? Couldn't you just have an exhaust shop wield to the back of the downpipe to hook up to the old system?

 

It is if I want too.

I would've done it to my first car, which was a base model '90 GP LE. I give him props :cheers: You should take a picture of the digi dash, I've never seen one in a GP.

Posted

Ok, More pictures.

 

4009461072_49048fe5ce.jpg

This is the interior. Yah, I know it needs work.

 

4009460936_d5c0ec2661.jpg

This is the rare part-digital dash.

 

4008695503_2dc51cce30.jpg

 

Posted

I bet. You said your's was a '90 Limited Edition coupe, right? It would have had more options on it than mine.

The only options mine has is the digital dash, A/C, and automatic transmission. Other than that, it is plain as vanilla. :razz:

Posted

It was an LE, but all it had was power locks, A/C (not that it worked), and auto trans. Mine had column shift, and 60/40 bench seats. Red w/ gray cloth.

Posted

60/40 bench seats.

 

WOW, i've seen maybe 2 in person that had bench seats...

Posted

Any more progress? I will try to take lots of pic's when I start my 3400 swap tomorrow night!

Posted

Well, I got the radiator drained. I got a new driver's seat installed.

I went to work on it last night, but the trunk was locked and I didn't have my keys. I know, it has a trunk release handle inside the car, but like so much of that car, it's broken.

 

On a lighter note, I might be getting a new truck on tuesday.

2004 Ford F150 - 4.2L V6, 5 spd. tranny, 124,000 miles. One helluva truck! :burnout:

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