Brought my cobalt down to SMG and swapped out her stock tb for a euthanasia ported and polished ls4 and changed her zzp catted downpipe for a zzp offroad down pipe. Net gain 15 hp and torque. car runs well with excellent throttle response, only a little rasp. will post dyno pic as soon as this site will let me.

Pictures by zfissette - Photobucket

 

nice pick up

 

definately glad to see it, gained twice as much by changing the tb and removing the cat as i did by swapping to a ported single pass manifold and swapping in a 2.6 ported and polished m62 for my 2.8 stock m62.

 

did you retune it or is that the same tune with the area scaler adjusted?

 

adjusted scaler and retune by fred at smg.

 

oh ok, i was gonna say 15whp/wtq just by swapping parts would be impressive

 

the parts were the change to be sure, the car was tuned last week, put down 258, swap the parts and dial her back in 273. i just hope when i move to tvs that she breaks 300.

 

Nothing against smg but I seen your comparison tunes from smg to gremlins tune. All they changed was pe timing and fueling and took timing away and added spark adders.. no no.. the maf calibration was never changed for the 2.6 .. I tell u what, go back to gremlin and I will be there to help him out if you want because going from a 2.8-2.6 will change about 3-5% in flow of air... So if the maf calibration is off the ecm has to work to make your stioch and.commanded wot fueling. So if you want to correctly get tuned, get with gremlin and ask him and ill lend a hand ..

 

But Ure power you made is good. Mainly from the catless dp... The t.b isn't much of anything.

 

your worried about breaking 300 on a tvs(not sure what pulley you are going to run) with all those supporting mods and 273 on an m62?

youll be fine

 

im planning to get together with john as soon as he is able to dial it in a bit more. hopefully he will have time soon since the weather is going to ****.

 

dunno, i dont see e85 or meth in OP's mods. if you want that TVS to beast you are really going to need one of the two.

 

Fuc* snow

 

Is ls4 even worth it? What are the gains of that alone?

 

around 4whp through the whole rpm range

 

i believe it gained more than 4, im running zzps long tube header/downpipe combo and i went from their highflow catted dp to their catless dp, i have a hard time believing that was responsible for more than a few horse but the ported and polished ls4 tb with the blended and polished adapter plate, that im inclined to think was easily half the 15 horse gain and it added a significant butt dyno improvement and response improvement. she really wants to get after it now. you give the gas a poke and she lunges forward. it was one of the last enterprise rental car things i wanted to get rid of, her sometimes lazy throttle and the ls4 did that.

 

lol no.... its more of a pain in the ass then anything. i actually downgraded, now my lsj trottle body sits in the shed.

When upgraded to the ls4 you do get alittle faster response time with the throttle, but extra power....naw not really

 

What do the LS4 TB come on originally and what MM are they ? Thanks

 

2006-2009 impala ss
2006-2007 monte carlo ss
2005-2008 pontiac gxp
2008-2009 buick lacrosse

and 89mm

 

from the others that ive seen, 4 was the minimum so i guess i should have said at least some have shown 10ish iirc


lsj = 3" O.D. - 2.67" I.D.
ls4 = 3.5" O.D. - 3.03" I.D.



LS4 TB...offered on V8 fwd sedans from gm (impala ss and grand prix gxp), 4.2L DOHC I6 motor from trailblazer, envoy, etc. One from the 3.5L DOHC I5 in the H3, Colorado, canyon SHOULD be the same exact one but I'm not 100%

COLORADO 04-05 Throttle Valve Assm; 3.5L
ENVOY 05 Throttle Valve Assm; 4.2L
TRAILBLAZER 03-05 Throttle Valve Assm; (4.2L)
HUMMER H3 06
BRAVADA 03-04 Throttle Valve Assm; (4.2L)
ENVOY XL 03-05 Throttle Valve Assm; 4.2L
ENVOY 03-04 Throttle Valve Assm; (4.2L)
IMPALA 06 Throttle Valve Assm; 5.3L
ISUZU ASCENDER 03-05 Throttle Valve Assm; 4.2L
GRAND PRIX 05-06 Throttle Valve Assm; 5.3L
ENVOY XUV 04-05 Throttle Valve Assm; 4.2L
TRAILBLAZER EXT 03-06 Throttle Valve Assm; 4.2L
CANYON 04-05 Throttle Valve Assm; 3.5L
MONTE CARLO 06 Throttle Valve Assm; 5.3L
TRAILBLAZER 06 Throttle Valve Assm; 4.2L
RAINIER 04-05 Throttle Valve Assm; 4.2L
SAAB 9-7X 05-06 6 cyl




majority of that info was in here

https://www.cobaltss.net/forums/how-...y-cheap-78653/

 

It's 75mm... Not 89mm

 

Ah Ok I have a couple of these. I noticed in 2008 there is a 6 pin used on those engines thats 78mm. Might be good for a big turbo swap.

 

Even if the gains are minimal its still throughout the whole rev range and itll only cost you around $75. And better throttle response is another worthwhile effort. Quit worrying about only peak hp numbers

 

yeah, most people say its worthless because the throttle becomes a bit more touchy than the stocker already is which makes a DD more difficult to drive in the stop and go city traffic. otherwise yeah its a cheap few ponies over the majority of the band