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My wife's tahoe is the most gutless V-8 I have ever had other than my high school hooptie 77 cutlass. This thing just falls on its face after 1st gear and any push of the gas below 4k rpm's in any other gear its just pitiful.
What can be done, I know you guys have to have seen this before.
How can I get some more ass out of this thing short of throwing an LQ9 in there?
The first step is a tune. there's just So much TM hindering performance and drivability.
ECM will limit throttle blade movement. Pull timing. And cut fuel.
Like any other vehicle start with a tune and boltons. Also do you know which gears are in it? If it is a 4x4 with any kind of tire under it(taller than 30") you will want to swap to at least 3.90s. The tahoes often come with 3.23s and 3.42s which while great for 80mph cruising isn't ideal for any kind of acceleration.
Boltons go like this...
1) custom tune From NP or another reputable tuner. $300
2) eBay or homemade CAI $60
3) high flow muffler $100ish (manga flow makes a nice big body good flow and quiet rumble)
After that in no particular order
LTs $300
Corvette servo $30 also prolongs trans life.
p&P throttle body $120 or free
UDP $200
Also a great supporting mod for your trans is a big trans cooler.
If you stick to boltons like these you don't loose driveability and will gain a little mpg along the way. If you want a big change in power more motor or a complete supercharger kit is the way to go. Don't waste time on changing cams and what not IMO considering what the vehicle is purposes for I would stick to the basic stuff or go real big on the changes.
Sub'd...
Who is a reputable EFI Live tuner for gas engines? I personally am thinking about going in and taking a bit of the TM out myself but don't want to hurt the trans... idk may just do a tune from a reputable tuner
Ok dumb question cause I am not a new school gasser guy.Quote:
Originally Posted by kerrige
the corvette servo you speak of is for the throttle on the drive by wire ls motors right?
wtf is the UDP?
NP uses what tuning software to tune with if you or farm can tell me
Corvette servo is for the transmission and makes for longer trans life and snappier shifts.
UDP stands for underddive pulley.
NP uses hptuners and farmtruc is allen nelson owner of nelson performance. The vast majority of gassers seem to be tuned with hptuners. It is the choice of most well known gas tuners anyways.
Hp tuners
Quote:
Originally Posted by kerrige
Well that sucks... I have already invested in the software and all the hardware for EFI Live so I most definitely want to stay in that platform.
I did not register UDP with underdrive pulley.... derp derp on my part.
I will look into the corvette servo but doubt the wife will like snappier shifts... I just know she hates how gutless this pig is. I will look at the stock tune in the next few days and look at the torque management.... a CAI will likely be in the near future, but with everything being so limited I might just pony up for a used LQ9 with an intake and CAI to drop in. this is all dependant if the wife really wants to mess with this thing or if she is ready to move up to a diesel car or truck.... I'm crossing fingers for a diesel in her future.
That is a gen IV motor I want to say they stopped making LQ9s and renamed the gen IV 6.0 LY6. It's a great motor. Be very careful with that 4L60E it is a time bomb after much of any modding. You can build your own intake pretty easy. NP does mail order tunes with free retunes. Why not just go that route?
Won't I have to buy some hardware to do mail order tunes?Quote:
Originally Posted by kerrige
Yeah I already know the weakness of the 4l60e, I had one in my last tahoe that shit the bed and it was kinda pricey for a rebuild, nothing like my ally build but still pricey. Too much needs to be done to make this tahoes drivability to be in the spectrum of what I want, nice quick and snappy throttle response through out the powerband.... sounds like this may get spensive...
You also have to factor in that the tahoe is a fat pig. Best bet is to due the said above mods, and not sure if stall and gears were put in there but those would help also.
Nope. With NP you pay for the tune they send you a freshly tuned PCM, you swap it out for your stock one, and mail it back. Tada! 25 hp and improved power across the rpm range.Quote:
Originally Posted by MudDoc
Again I pose the question? What gears does she have?
I would've thought it would be the 6 speed auto in an LTZ Tahoe? Or not in the 08? 4.10s, tune, intake and exhaust should wake it up pretty good I would think!
Only if you are going to e-mail him a "snapshot" of what your PCM is doing, then yes you would need to buy hptuners. If you get with someone that already has hptuners then all you would need is to buy credits. Someone that knows more about this will hopefully clear it up or add more to it. PM this guy, maybe you can work together, I think he is in Crosby. http://www.ls1truck.com/forums/members/greenvortec.htmlQuote:
Originally Posted by MudDoc
I'd have to go pull the RPO codes and look at which rear gear is in there, it's a 2wd so I am betting it is nothing big
I wish it were a 6speed, I would love a 6L series trans in that thing... but it is a 4speedQuote:
Originally Posted by 2k5Squirrel
Lots of 5.3L tahoes come with the 6speed. You should definitely snap a pic of the RPOs and post it up.Quote:
Originally Posted by MudDoc
LMG - 5.3L
M30 - 4L60E trans
G80 with a GU6 -3.42 rear gear
Get a tune and gears ASAP. I believe those tires are gonna be close to 32" tall. They should be 275/55-20. If you swap to some 4.10s and get a good tune I bet it wakes right up and you will be loving it. Those 3.42s are killing your entire powerband. You can also remove the cats if emissions aren't a problem.