HP gain?????

your compression #"s arent THAT low, if they were more then 25psi low, thats when i'd start worrying, and its highly doubtful that you're losing more than 3-5hp max from it.... i'm also pretty skeptical about an auto non-pi GT making 250rwhp with so few mods...they dont respond to bolt ons that well...they put down around 200rwhp stock, 50rwhp from minor bolt ons and a tune is a REAL stretch especially without the better heads, more agressive cams that the PI engines have...i'd be willing to bet he has the PI swap done...

as far as what people claim for HP gains on products they are generally way higher than what you'll really see...for the TB/plenum combo i'd expect 3-6hp, from the tune 10hp isnt out of the question, but it would have to be a dead on tune done by a really reputable shop...and like i said, maybe only a few hp from the compression...i think 230 MAYBE 235 would be a very reasonable goal to attain...

if ya want my opinion, get the compression done, get it running good and add n20...quick/cheapish way to make some nice power

Engage47 said:

Hmmmmmm i never thought of that doing a valve job could cause rings to go that does make sence .

Click to expand...

Doing a valve job doesn't cause the rings to go bad, as I explained earlier the hardened valves and valve seats will last as long as the engine. By the time the valves need doing, it's a good idea to rebuild the rest of the engine as well. By just doing the valves, the added pressure will then seep past the allready worn rings.
Just do a leak down test and see how that goes and then decide what to do from there.

your compression is fine. if its only down 15psi on one cylinder and all others check out, thats pretty dam good.

personally with that low of a budget, i wouldnt do anything to the car. 1000 bucks in 3 years to spend on mods isnt going to get you much of anywhere performance wise, maybe a few ponies.

the PI swap can be done for cheap when you find good deals on used stuff. you can find a plenum/tb and a handheld tuner for cheap as well off ebay. then maybe a short throw, makes more of a difference than most think. driving your car better can be more of a gain than gaining 20hp and driving crappy. if you find all that **** used, theres your alotted amount to spend. youll prolly be in the neighborhood of 230-240hp.