I don't care about keeping the DOD, so I would like cam and lifter choices. I have also read that I need to replace the intake and headers and I should be able to get there, correct?
Intake and maybe injectors and throttle body (LS2 intake requires different injectors and TB for example). Decent camshaft (even a stock LS2 cam might get you there). If you want to do a DoD delete, then lifters, valley cover, and I'd suggest switching the oil pump and swapping the oil pan to the LS2 vette pan. And tuning.
LS7 card MAF in 4" cold air intake tube (stock LS2 MAF would work as well, stock LS4 one is smaller) LS2 90mm throttle body, LS2 Intake, LS2 injectors, LS2 fuel rails (Cheaper/easier than the slightly better LS6 - both support 450+ hp) 224/232 .564/.575 DoD compatible camshaft and matching pushrods and springs LS7 factory exhaust manifolds (headers are also and option) 3" in, dual 2.5 out magnaflow muffler
My next upgrade will be to delete DOD and switch to a 222/226 .604/.604 custom camshaft - this should nudge me past 400 whp.
They're selling their swap headers so they don't directly compare the long tubes to the LS3 cast iron manifolds but comparing the graphs shows 410 ft.lbs at 3000 rpm for LS3 vs almost 500 ft.lbs at 3000 for long tubes. Gains in the lower rpm = more street-usable power.
[This message has been edited by mender (edited 04-02-2016).]
Long tube headers don't do jack for power. They're a waste of money.
since when??? even the cheap 99.oo set will add power.. not ideal but.. I think 60 years of dyno test say your wrong.. including every test done since the first ls based engine hint, what does the COPO Camaro come with.. there is a reason for that
[This message has been edited by E.Furgal (edited 04-02-2016).]
They're selling their swap headers so they don't directly compare the long tubes to the LS3 cast iron manifolds but comparing the graphs shows 410 ft.lbs at 3000 rpm for LS3 vs almost 500 ft.lbs at 3000 for long tubes. Gains in the lower rpm = more street-usable power.
Would be interesting to know what all was done to that "LS7" that was used, as it's obviously not stock. At a minimum it's running a different tune, and probably a different cam. I presume the LS3 manifolds were the Vette manifolds. Other vehicle manifolds will likely flow a bit better than the Vette manifolds do.
Granted the stock LS3 Vette manifolds are not the best, the stock LS4 manifolds certainly aren't either, but bolting on long tubes to a bone stock LSx isn't going to do jack squat. It might even make it run worse. And you certainly aren't going to bolt them up to an LS in the back of a Fiero anyway.
The topic of this thread is how to get an LS4 in a Fiero to 400 HP (presumed BHP, not RWHP). Headers are a given for pretty much any engine swap in a Fiero, especially a V8. But still, headers are not power adders, and any stock LSx exhaust is easily capable of handling a 400+ HP engine (as is obvious by the fact that the LS6, LS2, LS3, LS7, LS9, and several truck variants are rated at 400+ BHP.
Originally posted by E.Furgal: since when??? even the cheap 99.oo set will add power.. not ideal but.. I think 60 years of dyno test say your wrong.. including every test done since the first ls based engine hint, what does the COPO Camaro come with.. there is a reason for that
Where are there $99.00 long tube headers for swapping a V8 into a Fiero?
The COPO Camaro is a purpose built drag car. NHRA regulations require exhaust to exit headers at a certain point. COPO Camaro also comes with no emissions equipment, and has a camshaft meant to make power in the upper RPM range, not have a broad powerband for street or autocross driving. It only has enough of an exhaust system to satisfy the NHRA class regulations.
But I guess we should just all install zoomies in our street cars, because top fuel cars use them.
Would be interesting to know what all was done to that "LS7" that was used, as it's obviously not stock. At a minimum it's running a different tune, and probably a different cam. I presume the LS3 manifolds were the Vette manifolds. Other vehicle manifolds will likely flow a bit better than the Vette manifolds do.
Granted the stock LS3 Vette manifolds are not the best, the stock LS4 manifolds certainly aren't either, but bolting on long tubes to a bone stock LSx isn't going to do jack squat. It might even make it run worse. And you certainly aren't going to bolt them up to an LS in the back of a Fiero anyway.
The topic of this thread is how to get an LS4 in a Fiero to 400 HP (presumed BHP, not RWHP). Headers are a given for pretty much any engine swap in a Fiero, especially a V8. But still, headers are not power adders, and any stock LSx exhaust is easily capable of handling a 400+ HP engine (as is obvious by the fact that the LS6, LS2, LS3, LS7, LS9, and several truck variants are rated at 400+ BHP.
and when toss the manifolds, or oem short headers, and bolt on good headers, you make more power, this is fact, and yes you can put long tube headers on a fiero.. sure it's a custom job and not as easy as most.. The suck, squeeze ,bang, blow will always make more power when the exhaust is scavenging the bang when the cyl. is on the "blow".. less pumping losses= more power to the wheels..
Originally posted by dobey: Granted the stock LS3 Vette manifolds are not the best, the stock LS4 manifolds certainly aren't either, but bolting on long tubes to a bone stock LSx isn't going to do jack squat. It might even make it run worse.
"With the stock exhaust, we were consistently dyno testing in the 385-387 rear wheel horsepower range. With the Kooks/Corsa system, power increased to 421 rear wheel horsepower with no tuning. This is a gain of over 30 rear wheel horsepower, and we were running a very fat 11.0-11.25:1 air fuel ratio."
Being basically an air pump, more air through the engine either by lower restriction, better scavenging/wave tuning or (preferably) both will result in more power.
DOD delete, GM performance lifters, LS 6 intake, 60 lbs. injectors, GM Performance Corvette Hot Cam, Doug Thorley LS 4 performance headers. That hit the 400 bhp mark.
Joe Sokol
------------------ 85 SE Daily driver with a 3.4 DOHC OBD II 88 Formula/GT 4.9 Allante Intake (My Baby) www.fieroking.com
DOD delete, GM performance lifters, LS 6 intake, 60 lbs. injectors, GM Performance Corvette Hot Cam, Doug Thorley LS 4 performance headers. That hit the 400 bhp mark.
Joe Sokol
Now that ^ ^ ^ is an engine swap worth doing and Joe's way is how you do it.
