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Realistic gains to expect from an intake?

04lss

04lss

New member
So ive been looking at intakes, and i saw on 3800 performance.com the claim that the motorsports performance CAI will add 18whp and 24 ft-lbs torque. This seems inflated to me, they have a dyno sheet but you can always fudge numbers.
their dyno sheet shows 223 whp and 300 wtq, with just the intake and a downpipe. this doesnt seem realistic, but i dont know.... id love to hear some thoughts on this. if it really does work, the whp is definitely worth the cost.
 


Bull****.. A intake alone will probably barely gain anything to you'll ever notice. A downpipe or headers on the other hand will give you gains but don't expect much.


Save your damn money and make your intake and have similar gains as those expensive intakes the vendors like to advertise and spend the difference on other mods or maintenance.
 
headers take power away unless you pulley down. i went from 7 psi stock, to headers and 5.3 psi of boost.

car felt better off the line. but thats it with headers.
 
I thought stock whp on the GTP was around 190 200,
I know on the monte carlos and the newer w-bodies you can gut the factory box and stick a cone in it. I heard that this does not work on the 97 gtp any suggestions on the best way to build one?
 
still no gains. its all bull sh it. you will hear the whine, thats it. chances are you'll get worse mpg cause your nailing the gas all the time to hear the blower whine.

i made a diy intake for 35 bucks. it noes nothing just like the 100 dollar intakes. dont believe the BS.
 


Scottydoggs said:
headers take power away unless you pulley down. i went from 7 psi stock, to headers and 5.3 psi of boost.

car felt better off the line. but thats it with headers.
Click to expand...

so headers custom/purchased intake, and a 3.4/5 pulley for more hp?
im going to go e85 eventually but i want to drive the car for a while on pump while i get everything straight on it.
 
Scottydoggs said:
headers take power away unless you pulley down. i went from 7 psi stock, to headers and 5.3 psi of boost.

car felt better off the line. but thats it with headers.
Click to expand...

That's why you pulley down Sally

And helps kills KR which in return makes everyone happy
 
headers and a 3.4 pulley will add a fair amount of power. then the E85 will add more power, cause you can run a smaller pulley on corn.

but if you go smaller pulley for corn you'll need larger injectors, better fuel pump up grade and so on.


once again, the intake is not needed at all lol zero gains at that mod level too. k and n claims 5 hp, thats not gonna happen. its a lie.

if you want one, make your own for cheap. all it is, is that sound......
 
Im looking for about 30-40whp until i go corn, i was thinking the 3.4 and headers might come close to that, if not what else would i need to add? rockers maybe?
 


rockers cant hurt, not cheap once again, or a cam, also not cheap.

anything smaller then the 3.4 and the corn you should start thinking transmission, cause its gonna blow up.

my set up is maybe a 30 hp gain. not 100% sure tho. it defiantly moves better.

not sure if you can see my sig or not. but ive got----1.95 rockers, headers, 3.4 and tuned.
 
Scottydoggs said:
those are stock dyno #. there is zero gains form a intake. snake oil..........
Click to expand...

Scottydoggs said:
headers take power away unless you pulley down. i went from 7 psi stock, to headers and 5.3 psi of boost.

car felt better off the line. but thats it with headers.
Click to expand...

Both of these comments are entirely false.
Stock L67's make 180-190whp, not 223whp.
Headers usually add 15-20whp without a tune or a pulley.

I've had dozens of these cars on a dynojet. To say they lose power with headers is ludicrous.
 
SnowFlake said:
Both of these comments are entirely false.
Stock L67's make 180-190whp, not 223whp.
Headers usually add 15-20whp without a tune or a pulley.

I've had dozens of these cars on a dynojet. To say they lose power with headers is ludicrous.
Click to expand...

I've "felt like" I lost some low end when I added headers with stock pulley, but gained a good chunk of top end. No dyno numbers to verify this, though.
 
you loose boost for sure, it did gain power off the line i said, ( headers will let it melt the tires) but its no faster then stock to me. till you add a smaller pulley. butt dyno

and the intake dont add those numbers, you know that.


and thats crank HP as the dealer would post it. not to the wheels.
 


SnowFlake said:
Both of these comments are entirely false.
Stock L67's make 180-190whp, not 223whp.
Headers usually add 15-20whp without a tune or a pulley.

I've had dozens of these cars on a dynojet. To say they lose power with headers is ludicrous.
Click to expand...

Hell froze over...

Because this is correct.

If your stock L67 car makes 200WHP or more, you'll be lucky.

Adding headers lowers boost numbers because the car is flowing more freely...you then add the pulley to make up for the loss, because all it is doing is shifting the power up...you're not losing ANY power, and it's easier to launch because the torque is now geared a little higher in the band.

HiPo Pontiac did a test I think on an SSEi back in the day, and it gained close to 30WTQ and north of 20WHP. L36 gains were close as well...because I think they tested a GP GT too, just to compare...and to show how crappy and restrictive the manifolds to the catback really are.
 
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I thought crank hp was 240 for 99-03 and 260 for 04 - when ever the stopped making them
Edit: 04lss ninjad me
 
Yeah, usually 20% less than factory numbers. Drivetrain loss.
240 - 20% = roughly 180 - 190 ish. Anywhere around there really
 
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