CR headache

[1988GTU]

Just started a 1996 3100 build for my 94 Grand Prix. Engine has roller cam/rockers, and a rediculous dished piston that I am told yeilds a CR of 8.8:1. Would like to boost CR to about 9.5:1 and get a little hotter cam. Any suggestions?

he never said what trans he was using

But yes he could most likely use OBD1 and $1FA code to run the E trans.

A 94 GP comes standard with a 4t60sleeezyE.
Why go through all the hassle when an obd2 swap for a GP of that nature isn't really that hard?

[Superdave]

he never said what trans he was using

But yes he could most likely use OBD1 and $1FA code to run the E trans.

[1988GTU]

Not with a 4t60EEEEEEEEE

[Superdave]

or OBD1

[1988GTU]

Thanks for the info, checked the website,looks good. These camshafts an upgrade to the factory roller? Also, while the engine is a 96, it will go in a 94, so whatever cam I use must get along with the 94 computer.

Then you will be advised to stay 90% stock and nothing internally should be tampered with. Swap to OBD2 and start tuning.

[aedden1]

Thanks for the info, checked the website,looks good. These camshafts an upgrade to the factory roller? Also, while the engine is a 96, it will go in a 94, so whatever cam I use must get along with the 94 computer.

[1988GTU]

head decking, thinner hg's, longer rods, swapping the crank out. I think (assuming you used a 2000+ 3100 motor) you can swap in a 3400 crank.

Be careful, you don't want to fall out of the quench area.

3400 crank is identical to the 3100, 3.1, and 3.4 DOHC so that wasn't good info. Stock compression is supposed to be 9.5:1 but I am not sure if any of those numbers on our calculator are wrong.

I have comp roller cams on wot-tech, with a listing for all the lobes. I also offer a cam selection service, which is free after purchase of a cam. For a 96 you are looking at something around a 206 duration .480 lift cam, since you will need a 97 ECM to do tuning. I know that cam will work with your stock ECM. You should get a 3400 throttle body (56mm) as well, as its a solid upgrade over your stock 52mm unit.

I wasn't sure about some facts so I sorta gave me disclaimer.

[SappySE107]

3400 crank is identical to the 3100, 3.1, and 3.4 DOHC so that wasn't good info. Stock compression is supposed to be 9.5:1 but I am not sure if any of those numbers on our calculator are wrong.

I have comp roller cams on wot-tech, with a listing for all the lobes. I also offer a cam selection service, which is free after purchase of a cam. For a 96 you are looking at something around a 206 duration .480 lift cam, since you will need a 97 ECM to do tuning. I know that cam will work with your stock ECM. You should get a 3400 throttle body (56mm) as well, as its a solid upgrade over your stock 52mm unit.

[aedden1]

Looks like I had some bad CR data. According to this sites CR calculator I have a 9.36:1 CR. Thats ok, But still need info about performance cam for factory roller setup. Engine is a 96.

[1988GTU]

head decking, thinner hg's, longer rods, swapping the crank out. I think (assuming you used a 2000+ 3100 motor) you can swap in a 3400 crank.

Be careful, you don't want to fall out of the quench area.

[aedden1]

Just started a 1996 3100 build for my 94 Grand Prix. Engine has roller cam/rockers, and a rediculous dished piston that I am told yeilds a CR of 8.8:1. Would like to boost CR to about 9.5:1 and get a little hotter cam. Any suggestions?