2.5 performance

I have my 2.5 engine out of my 98 LGT to do Headgaskets. Is there any performance mods I should look at? Or do now that it was out? Has to be C.a.r.b. got to love California.

There isn't really anything you can do to increase the performance.

 

But since it is out Check the rear main seal for leaks (usually last the life of the car), replace the oil separator plate if it is plastic, reseal the oil pump check for loose screws and replace the o ring, replace the front crank seal and cam seals, etc. All new timing components including tensioner. Inspect the bores. Maybe split the block and replace the rod and main bearings and piston rings if you are feeling adventurous. Replace intake mani and exhaust mani gaskets. Replace the water cross pipe o-rings. New plugs. Valve cover gaskets. Check the oil pan seal.

So I'm stuck with a turd?

I'm pretty happy with my 2.2 with the correct timing and running properly and premium fuel. Plenty of guts and zip for daily driving. I can keep up with just about anything traffic throws my way. NOT SO when the car was out of time!

 

I would have thought there was a head swap or a head deck you could do to increase compression but no idea how that works out with the 2.5.

Yeah I've been reading a lot about these hybrid motors where there swapping the heads. Sounded sweet but I guess I'll just stick to resealing this beast up with new HG's.

I wonder what kind of head swap you could do. It would be tricky because you would need the correct sensors to go with the head and the right intake mani. Probably more trouble than it is worth.

You can "deck" the heads on just about anything but it requires adjustable cam gears to make up for the change in timing after a certian point. It dives into the "not worth it" category pretty fast. You'd need premium or blended street/race gas by that time, to keep it from pinging and custom cut pistons for valve clearance...

here are some relistic things that no one metioned yet,

 

delta cams

14 pound flywheel(stock is like 24)

1 pound crank pully(stock is 5)

cut up to 20 thou off the heads to safe

light porting

egr delete

 

you may get close to 200 bhp with all that. on c16

 

also here are some part numbers

806786040 rear main

806733030 front main

21114AA051 water pump

11810AA000 pvc

44011AC030 headers

4- 806732150 cam seals

12-13271AA051 rubber boltseal

12-800706630 bolts

2- 11044AA642 sti HG

You can go meth injected if you're swapping out the flywheel and crank pulley, most people do it on turbo, but it's also great if you want to get adjustable cam gears. It'll also make timing more reliable, as well as keep your motor clean.

 

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or, just buy a WRX.

 

swap in a twin turbo.

 

remove all of the interior, 4 doors and most of the roof.

 

So I'm stuck with a turd?

 

no, it's a subaru.

How about I steal a wrx sti and hide all the parts on my LGT

People do that all the time. Everything bolts right up. Takes about 7 hours.

 

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I'm on it

Add nawzzz

 

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here are some relistic things that no one metioned yet,

 

delta cams

14 pound flywheel(stock is like 24)

1 pound crank pully(stock is 5)

cut up to 20 thou off the heads to safe

light porting

egr delete

22e heads

phenolic intake manifold spacers

22e gates timing belt kit

msd ignition coil

enhanced grounding kit

 

you may get close to 200 bhp with all that. on c16

 

also here are some part numbers

806786040 rear main

806733030 front main

21114AA051 water pump

11810AA000 pvc

44011AC030 headers

4- 806732150 cam seals

12-13271AA051 rubber boltseal

12-800706630 bolts

2- 11044AA642 sti HG

 

My little contribution to this.

NOS!!!!! LOL. Our cars will naturally feel slower due to the AWD. I've raced a few cars I didn't think I would beat and I did. One being a 00 Civic Si with only a axle back exhaust and CAI. Very close but by the time we had to brake I was ahead by a tad. Tad meaning a foot. LOL.

Looking at our NA cylinder heads I think after a good port and polishing, intake manifold port matching, intake and exhaust and maybe some cams I think you should be able to gain at least another 25 HP. From what Ive seen from dyno vids that UEL exhaust header with high flow cat alone nets 14awhp. So 25 isn't far fetched and it would lead me to believe with those mods listed above 30 would be the correct HP increase number.