PI headswap complete!! dyno #'s.
08-09-2004, 02:47 PM
#12
5th Gear Member
Join Date: Dec 2003
Posts: 2,883
RE: PI headswap complete!! dyno #'s.
ORIGINAL: jdaniel
What kind of heads did you get and what was done to them? Im thinking of porting mine but thats gonna run me like $2000. Dunno yet.
What kind of heads did you get and what was done to them? Im thinking of porting mine but thats gonna run me like $2000. Dunno yet.
08-09-2004, 10:01 PM
#13
5th Gear Member
Thread Starter
Join Date: May 2003
Location: Norfolk, VA
Posts: 2,129
RE: PI headswap complete!! dyno #'s.
[/quote]
that would be a waste on a non boosted 4.6 jd. there is alot more that 2k would get you.
[/quote]
what the heck do you know about boosted 4.6's?
that would be a waste on a non boosted 4.6 jd. there is alot more that 2k would get you.
[/quote]
what the heck do you know about boosted 4.6's?
08-09-2004, 10:24 PM
#14
I ♥ Acer
Join Date: Sep 2003
Location: United States
Posts: 8,826
RE: PI headswap complete!! dyno #'s.
well, BC it wasnt a waste on your car because you were doing a headswap anyways, but in general yes it is a waste IMO to pay for ported heads to pickup what, 20 hp? for another $400 you coulda got a vortech tuner kit and added 100hp... but I wouldnt be suprised if you picked up close to 100 hp with ported PI heads + cams over your stock non-pi stuff.
08-09-2004, 11:41 PM
#15
I ♥ Acer
Join Date: Apr 2004
Location:
Posts: 9,172
RE: PI headswap complete!! dyno #'s.
ORIGINAL: mdvaldosta
cams alone will put you over 300 jd, something like VT stage 1's would be best with your stock heads and would add 25-30 rwhp after you got them tuned.
cams alone will put you over 300 jd, something like VT stage 1's would be best with your stock heads and would add 25-30 rwhp after you got them tuned.
Yeah, Im still trying to wait on doing any inside work till I decide on going FI or staying NA. I wanna do FI but Im trying to wait till im out of the military so I can do it right, like tearing apart the engine and building it for FI. I want a badass ride and I wanna do it the right way.
08-10-2004, 02:06 AM
#16
5th Gear Member
Join Date: Dec 2003
Posts: 2,883
RE: PI headswap complete!! dyno #'s.
ORIGINAL: BCisme
what the heck do you know about boosted 4.6's?
what the heck do you know about boosted 4.6's?
ORIGINAL: mdvaldosta
but in general yes it is a waste IMO to pay for ported heads to pickup what, 20 hp? for another $400 you coulda got a vortech tuner kit and added 100hp
but in general yes it is a waste IMO to pay for ported heads to pickup what, 20 hp? for another $400 you coulda got a vortech tuner kit and added 100hp
08-10-2004, 08:05 AM
#17
5th Gear Member
Thread Starter
Join Date: May 2003
Location: Norfolk, VA
Posts: 2,129
RE: PI headswap complete!! dyno #'s.
as always, your pretty much right. it isn't worth the 1500-2000 to pay a shop to rip your heads off, port them and put em back on for maybe 20 hp on an N/A bolt on car. just wait till your putting a shortblock in or something and then do it. most olt on non pi GT's barely put 200 to the wheels, so yes i gained about 100 hp on the swap. if i had a 99+ GT, i would have just put an S trim on it.
08-10-2004, 02:49 PM
#18
6th Gear Member
Join Date: Jan 2004
Location: United States
Posts: 12,575
RE: PI headswap complete!! dyno #'s.
ORIGINAL: BCisme
a non pi (96-98) motor benefits from a PI head swap with increased compression. the PI heads have a smaller combustion chamber, wich on a pre 99 block increases compression to about 10.5 to 1, as the 99+ are 9.4 to 1.i broke 300 because the heads are ported with oversize valves, the cams of course and i have alot of bolt ons. upper intake, TB, L/T headers etc.... if i had thrown in a set of 24lb injectors and the motor been a bit cooler, she would have done at least 310. i intend to add those along with a few more items to up it, if i don't put a new shortblock in it first.
2000GT4.6, with a good set of cams, like VT stage II, most 99+ guys are hitting 280-290 on the stock heads. with full bolt ons and a good tune of course. the most i've ever seen in an N/A 2V displacing 4.6 cid is 334. and he runs 11.3's.
a non pi (96-98) motor benefits from a PI head swap with increased compression. the PI heads have a smaller combustion chamber, wich on a pre 99 block increases compression to about 10.5 to 1, as the 99+ are 9.4 to 1.i broke 300 because the heads are ported with oversize valves, the cams of course and i have alot of bolt ons. upper intake, TB, L/T headers etc.... if i had thrown in a set of 24lb injectors and the motor been a bit cooler, she would have done at least 310. i intend to add those along with a few more items to up it, if i don't put a new shortblock in it first.
2000GT4.6, with a good set of cams, like VT stage II, most 99+ guys are hitting 280-290 on the stock heads. with full bolt ons and a good tune of course. the most i've ever seen in an N/A 2V displacing 4.6 cid is 334. and he runs 11.3's.
Also what I am saying is that you not only have a set of aftermarket cams in there, but machined heads. I would expect with machined heads and cams to be producing much more than 300 RWHP.
I am starting to think that cams really arn't worth the trouble on a N/A 4.6L. I am really thinking that working the heads is compeletly not worth it N/A, but of course you already had them off anyway. I guess that would make the big decsion for yoi. If only superchargers didnt cost 3500 dollars.
Thread
Thread Starter
Forum
Replies
Last Post
jwog666
Pipes, Boost & Juice
11
12-27-2021 08:09 PM
