longtubes on an l99

[mmd8x28]

Got a friend with an L99, and she wants longtubes on it...

Can an L99 get longtubes, and where?

[jaysz2893]

as far as i know the L99 is identical externally to the LT1, so I would think LT1 ones would fit.

edit:
L99 (4.3L)
A 4.3L (263in3) was a 305 with updated block architecture to be generation II and a reduced 3 inches (76 mm) stroke. It was designated the L99, and was introduced in 1994 for the Chevrolet Caprice (http://ltxtech.com/wiki/Chevrolet_Caprice). It was externally identical to the LT1, but the bore was 3.736 inches (94.9 mm) and the stroke to 3 inches (76 mm) giving it a displacement of 263 in3. The pistons used in the L99 were the same as the ones used in the Vortec 5000 (http://ltxtech.com/wiki/GM_Vortec_engine#5000), but 5.94 inches (151 mm) connecting rods were used to compensate for the shorter stroke.
Like the LT1, it features sequential fuel injection (http://ltxtech.com/wiki/Fuel_injection), reverse cooling (http://ltxtech.com/w/index.php?title=Reverse_cooling&action=edit&redlink=1), and an optical ignition pickup. Output is 200 hp (150 kW) and 245 lb·ft (332 N·m). Due to its smaller displacement, it provides better fuel economy than the 5.7 L LT1, but at reduced horsepower & torque levels.
2nd edit,
I found some Lt headers for a 94 Impy SS:
http://www.summitracing.com/parts/HED-68294/

Maybe them?

[mmd8x28]

I didn't know if the exhaust holes were different size, like the intake manifold was (as I was thinking)..

[mmd8x28]

Looking at the pic, it doesn't look like it'd fit.. Something doesn't seem right about them..

Hard to see, but this is on mine: http://img.photobucket.com/albums/v395/Evilweredragon/spark.jpg

If it's like mine, they should connect aiming down, not towards the rear..

EDIT: Oh, she needs EGR, but NOT the air pump, which is like me, as I'll be getting headers too, keeping EGR, but ditching the AIR.

[jaysz2893]

Longtubes connect under the car unlike the OEM Manifolds that connect up near the block. To finish it off she would need a dual exhaust set up (x or H pipe, mufflers, cats, and tailpipes to the rear)
If you want the headers to connect to the stock exhaust piping you need shorties, not Long Tubes.

[mmd8x28]

Oh ok.. We both have straight exhaust, no Y, H or X pipe.. Just each going their own way, so to say..

Then shorties it'll be.. But I do plan personally to get my cats removed, she's keeping them (because she may move to a state that has inspections).

[jaysz2893]

I made my cats removable. DE inspection mandates you at least have them. Some states you can not move thier location, let alone remove them. Most Shorties will have provisions for EGR/AIR. My LT's do not, but they do make them with the EGR/AIR fittings. I would have her check the local DMV for the rules with removing/relocating emissions control devices. Some state will not allow even the removal of the AIR.
BTW my car passes both visual and the sniffer in DE with the cat in the y pipe.

[mmd8x28]

Well from what I understand, GM said the AIR pump on B-Bodies can be removed, and if that's true, DMV can't say squat as far as I know.

[jaysz2893]

FWIW, GM does not care if you remove your Emissions stuff. Federal and State Laws mandate what you can and can not remove. (just ask anyone in California)

AIR is there to remove unburned gasses from a cold engine. Ones the engine gets hot enough it turns off. If she does remove it, it needs to be tuned out of the ECM.

[mmd8x28]

I was told on ls1lt1 that for these 94s, removing an AIR pump does NOT need to be tuned out, as it's not OBDII and doesn't set off a light..

[jaysz2893]

hmmm, got me there, I turned mine off with my tune. Maybe it just keeps the AIR Pump motor from running?

[mmd8x28]

Now I'm confused, lol.. Maybe, like you said, just doesn't send out a signal to turn on the AIR pumps motor.. Oh well, for something that barely runs I could care. My SES light is always on anyway, if it set it, oh well, wouldn't notice..

[jaysz2893]

Man, I thought FL was adopting CA style emissions laws.. If my SES light is on I will fail at DMV.

[mmd8x28]

I hope not

i got ses ligh from bad electrical, and no mechanic could fix it.. id have to sell my car

[mrbadlt1]

no emissions or testing or inspections in florida, so eff all that emissions garbage

[popo8]

Got a friend with an L99, and she wants longtubes on it...

Can an L99 get longtubes, and where?


may just be the cop in me that makes me suspicious.... but isnt it odd the same day you post this^^^^, you find out your car is a L99 as well....? and with plans for a set of long tubes..... hmmmm:hmm:

[Chris]

may just be the cop in me that makes me suspicious.... but isnt it odd the same day you post this^^^^, you find out your car is a L99 as well....? and with plans for a set of long tubes..... hmmmm:hmm:

Naw all chicks are into the l99 ' :hmm:

As for the Air pump if it is the same as fbodys you just need to leave the fuse in so the ses doesnt not come on. Other than that pics of the freind and car :metal:

[mmd8x28]

Well, those that know me know I've for a while had a friend with an L99 and an LT1 Caprice.. (The l99 isn't IN a caprice, it's actually in a buggy she was making).

Did go to the mechanic today, and learned my block had 588 stamped on it, not 327... Went home hoping it wasn't true.. But my friend wanted me to ask about long tubes for her L99 buggy.. Since I was pondering longtubes, I thought I'd just listen in too for myself..

[popo8]

but... is she hot?

[mmd8x28]

meh.. depends on your idea of hot.. i say she is, but, not completely physically attracted.. enough to want to sleep with her, but not fall in love.

shes tattooed up, and wears spikes.. im not attracted to that.. but the slender body yes..

I've tried to get pics, but all i ended up getting was a broken cell phone.. i'll try again next time i visit.. she don't have the guts to smash my real photo camera..

[5POINT7]

:needpics:


:jest:

[mmd8x28]

yes yes, i know.. it's why i didn't want to really bring it up, just keep it subtle.

i feel worthless myself when i cant GET the pics.. I've tried being sly with my cell phone, never worked.. she knows what im doing..

girls usually love their pic being taken, but she doesn't..

maybe she has a double life :P

[popo8]

meh.. depends on your idea of hot.. i say she is, but, not completely physically attracted.. enough to want to sleep with her, but not fall in love.

shes tattooed up, and wears spikes.. im not attracted to that.. but the slender body yes..

I've tried to get pics, but all i ended up getting was a broken cell phone.. i'll try again next time i visit.. she don't have the guts to smash my real photo camera..


I am picturing PUNKY BREWSTER with an attitude....

[jaysz2893]

man this thread sprialed into doom...

[GTP231]

I was told on ls1lt1 that for these 94s, removing an AIR pump does NOT need to be tuned out, as it's not OBDII and doesn't set off a light..
My experience it will still throw the light.

[mmd8x28]

My experience it will still throw the light.

I'm pretty sure it was Shoebox that said it will NOT throw the light..

[GTP231]

Its been awhile I may have pulled the fuse too I forget. Shoebox has his own site and is supposed to be a guru. Don't blame the other site about misinformation if its wrong though....

[mmd8x28]

There's no need to be defensive.

It was on ls1lt1 that I was told this information, by many of the members there including ShoeBox...

[2fast4u88]

hmmm, got me there, I turned mine off with my tune. Maybe it just keeps the AIR Pump motor from running?

Anything obd1 does not need a tune for the emissions. Egr or air. Mine is long gone on both cars one has a tune for and the other doesn't. I have no check engine light on the one that doesn't.

So no tune needed to pass emissions. Or what ever if you remove one of the two. I mean if you remove the egr with out a good tune you won't pass emissons though.

See ob2 does self checks of the egr valve not sure about the air pump. Where ob1 does not. The computer just commands what ever on. The air pump can be removed. But the egr would need the solenoid still there. Or it will set a light that way. But all you have to do is cap the line off it that would go to the egr.

If you want to make it all clean and get rid of all the junk on the intake you can. Then a tune will be needed.

I think I was the one that told evil this. lol ;) So no need to get all bent out of shape gtp. If you want prove watch my vid's no light at all. That is the one with out a tune. I think if you pull the fuse it will though. Not sure I still have mine in. Just zip tied the wires up and out of the way.