jQuery not supported.



4.88s & Still a Turd!

4.88s & Still a Turd!

Postby SLE Z71 [OP] » Jun 30 2021, 2:47am

Good evening everyone,

I recently swapped out the 3.73s with 4.88s with a Yukon duragrip carrier.
Truck is a 2001 5.3 with 135k kms on the motor, truck has 750 8-) mild trans build with shift kit, vett servo, 3-4 clutch pack and the typical refurb baby blue converter which i believe is 1800-2000 stall. Headers, black bear tune (egr & front 02 sensor delete), volant intake, electric fan swap, borla pro xs, stock cats (high flow on order) sitting on 35x12.5x18s and lifted 8"
New MAF sensor, plugs & wires. I recently checked my fuel pressure at the rail and it was only at 44psi, turned out my filter was clogged so i changed that and now currently sitting at 50psi which is better but not great.

I'm lost for words on where to start because my truck is a complete dog even empty, and comparing to my buddys 02 (same set up just 4.10s & 35's) i can spin those tires until i let off the gas and i cant even break lose on wet grass :lol: and towing a 7x14 enclosed for work daily (4700lbs -/+ trailer and tools) is a job in its self.

It literally feels like the truck slowly gains power when you mash the gas and doesn't really wake up till 2nd or 3rd gear at 2500-3000rpms. Tires wont even churp off the line unless the roads wet or i hit gravel.
Only difference between 3.73s and 4.88s that i can tell is i rev out at 2500rpms on the highway where it used to be 1500-2000rpms and averaging 30L/100kms :lol:

Open to all options and suggestions.

Image
Image
Original Poster
User avatar
SLE Z71
Combustion on 1 piston [L2]
Combustion on 1 piston [L2]
Posts: 112
Topics: 17
Images: 13
Joined: May 26 2013, 10:00pm
Years of membership: 8 years of membership8 years of membership8 years of membership8 years of membership8 years of membership8 years of membership8 years of membership8 years of membership
Location: Ontario EH!
Year: 2001
Make/Model: GMC Sierra
Variant: SLE
Extra Info: Z71 5.3L
Group Membership:
Registered users

Re: 4.88s & Still a Turd!

Postby Walkers » Jun 30 2021, 11:56am

Well, you have diagnosed a bad fuel pump, and are complaining that your gears didn’t make a difference without fixing the fuel pump. It might be crazy, but maybe you should replace the fuel pump.
Walkers
Shifting into Sixth Gear! [L3]
Shifting into Sixth Gear! [L3]
Posts: 3269
Topics: 80
Joined: Sep 01 2017, 12:06am
Years of membership: 3 years of membership3 years of membership3 years of membership
Year: 2013
Make/Model: Chevrolet Silverado
Extra Info: Ext cab 2500 4x4
Group Membership:
Registered users

Re: 4.88s & Still a Turd!

Postby roorancher » Jun 30 2021, 12:40pm

Could have left the truck bone stock and it would have towed 4700 pounds just fine.....Just sayin'.....
Image


2015 Silverado LT Texas Edition

129,559 miles as of 08/01/21

Diode Dynamics-Hi-6/Cargo Mods-Boost Auto Mirrors-Elite Catch Can-AMP Power & Bed Steps-Bilstein-Carhartt-Swing Case-Vitesse-Camera-Source-Kicker-Winjet/DD HIDs


Diablew Tune
User avatar
roorancher
Shifting into Sixth Gear! [L3]
Shifting into Sixth Gear! [L3]
Posts: 4198
Topics: 123
Images: 28
Joined: Nov 20 2017, 2:52am
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: Lake Whitney, Texas
Year: 2015
Make/Model: Chevrolet Silverado
Variant: Texas Edition
Group Membership:
How-to Authors
Registered users

Re: 4.88s & Still a Turd!

Postby shakenfake » Jun 30 2021, 1:58pm

Long tube headers and stock cats do not go together, did you mean short tube headers and stock cats?

Front O2 delete? Yeah I know why it's a turd, cause you deleted the O2 sensor you actually needed.
Image
Bandito
LQ4 Swapped 99 ECSB
212/218 low lift cam, 862 heads
User avatar
shakenfake
Shifting into Third Gear [L3]
Shifting into Third Gear [L3]
Posts: 1397
Topics: 44
Images: 19
Joined: Jun 26 2019, 7:05pm
Years of membership: 2 years of membership2 years of membership
Location: TX
Year: 1999
Make/Model: Chevrolet Silverado
Variant: LT
Extra Info: 1500 ECSB 6.0
Group Membership:
Registered users

Re: 4.88s & Still a Turd!

Postby [email protected] » Jun 30 2021, 2:23pm

Step 1 is it currently throwing any codes? Was the mail order tune for the current mods? And I sure hope you mean rear O2's were deleted, the front ones are needed.
[email protected]
Firing on 6 cylinders [L1]
Firing on 6 cylinders [L1]
Posts: 63
Topics: 1
Joined: Aug 15 2017, 5:47pm
Years of membership: 3 years of membership3 years of membership3 years of membership
Year: 2017
Make/Model: GMC Sierra
Variant: SLT
Group Membership:
Registered users

Re: 4.88s & Still a Turd!

Postby Dommieboy » Jun 30 2021, 6:02pm

I hear that black bear does logging when they set you up a tune. Can you send them logs to see if they see anything odd going on?
Dommieboy's 2012 Silverado LTZ
BAKFlip - AirAid Jr. - LS7 TB - TruCool 40k - Diablew-ed - SpinTech - JBA - AMSoil
User avatar
Dommieboy
Combustion on 3 pistons [L2]
Combustion on 3 pistons [L2]
Posts: 302
Topics: 19
Images: 1
Joined: Mar 07 2016, 6:32pm
Years of membership: 5 years of membership5 years of membership5 years of membership5 years of membership5 years of membership
Location: Utah
Year: 2012
Make/Model: Chevrolet Silverado
Extra Info: 6.2L
Group Membership:
Registered users

Re: 4.88s & Still a Turd!

Postby silentbravo » Jun 30 2021, 10:23pm

Black Bear wouldn't have even tuned it if it was missing the front O2's which are actually critical for the truck to even run.

I would ask Black Bear to check some logs. They should be able to tell if it is knocking/pinging which weak or bad fuel pump will probably cause. Because you are running the huge tires they may have tuned it conservatively and left in all or most of the torque management for the transmission so it would stay happy. The TM really makes a difference in how much power you are "allowed" to put through the transmission to the ground, and compound that with huge heavy tires and possibly weak/bad fuel pump and it could be pretty sad.

Realistically these engines don't even hardly start making power til the upper 2k-3k RPM range anyway so that sounds about right.

Spinning 35" tires with a 5.3L even with decent mods is asking quite a bit as well.
User avatar
silentbravo
Shifting into Sixth Gear! [L3]
Shifting into Sixth Gear! [L3]
Posts: 2539
Topics: 24
Images: 1228
Joined: Jan 14 2016, 8:37pm
Years of membership: 5 years of membership5 years of membership5 years of membership5 years of membership5 years of membership
Location: Idaho
Year: 2001
Make/Model: GMC Sierra
Extra Info: 2500HD SLE 6.0L 4x4
Group Membership:
Registered users

Re: 4.88s & Still a Turd!

Postby shakenfake » Jun 30 2021, 10:27pm

I also do want to note that unless he has HPTuners he will be unable to send them logs anyhow
Image
Bandito
LQ4 Swapped 99 ECSB
212/218 low lift cam, 862 heads
User avatar
shakenfake
Shifting into Third Gear [L3]
Shifting into Third Gear [L3]
Posts: 1397
Topics: 44
Images: 19
Joined: Jun 26 2019, 7:05pm
Years of membership: 2 years of membership2 years of membership
Location: TX
Year: 1999
Make/Model: Chevrolet Silverado
Variant: LT
Extra Info: 1500 ECSB 6.0
Group Membership:
Registered users

Re: 4.88s & Still a Turd!

Postby SLE Z71 [OP] » Jul 02 2021, 5:31pm

[email protected] wrote:Step 1 is it currently throwing any codes? Was the mail order tune for the current mods? And I sure hope you mean rear O2's were deleted, the front ones are needed.


No codes at all and yes I meant rear 02s not fronts.
A local shop tuning shop did all the tuning work.
Image
Original Poster
User avatar
SLE Z71
Combustion on 1 piston [L2]
Combustion on 1 piston [L2]
Posts: 112
Topics: 17
Images: 13
Joined: May 26 2013, 10:00pm
Years of membership: 8 years of membership8 years of membership8 years of membership8 years of membership8 years of membership8 years of membership8 years of membership8 years of membership
Location: Ontario EH!
Year: 2001
Make/Model: GMC Sierra
Variant: SLE
Extra Info: Z71 5.3L
Group Membership:
Registered users

Re: 4.88s & Still a Turd!

Postby SLE Z71 [OP] » Jul 02 2021, 5:33pm

shakenfake wrote:Long tube headers and stock cats do not go together, did you mean short tube headers and stock cats?

Front O2 delete? Yeah I know why it's a turd, cause you deleted the O2 sensor you actually needed.


My mistake I meant rear 02s. Yeah they are bbk shorty headers and factory cats to my understanding. Like I mentioned high flow cats are on order.
Image
Original Poster
User avatar
SLE Z71
Combustion on 1 piston [L2]
Combustion on 1 piston [L2]
Posts: 112
Topics: 17
Images: 13
Joined: May 26 2013, 10:00pm
Years of membership: 8 years of membership8 years of membership8 years of membership8 years of membership8 years of membership8 years of membership8 years of membership8 years of membership
Location: Ontario EH!
Year: 2001
Make/Model: GMC Sierra
Variant: SLE
Extra Info: Z71 5.3L
Group Membership:
Registered users
Next

Return to Towing/Trailers

 

  • Similar topics
    Replies
    Views
    Last post

Common search terms

still front truck rear work same turd

It is currently Aug 03 2021, 6:00am

  • Sponsor
Login  •  Register
Towing/Trailers Forum
Towing/TrailersDiscuss towing and trailers and plows, or overdrive and hitch towing capacity (gvw) and tongue weight for heavy loads. This is the place for tow hitches, receivers, and trailer wiring as well as snow plowing.
To create a new topic in Towing/Trailers, click this button:
Previous topic Next topic
Sitewide News Sitemaps & Feeds

Who is online

Users browsing this forum: No registered users and 3 guests