dyno'd today not very happy
Thread Starter
12 Second Truck Club
iTrader: (4)
Joined: Nov 2004
Posts: 6,273
Likes: 0
From: Jacksonville FL.
dyno'd today not very happy mods in sig. i hit 289rwhp there computer was messed up so i couldn't get a rwtq number. does this sound about right or not. here is the run down:
12.2:1 afr from 4000rpm up to 6300 (couldn't get it any leaner)
29* from 3000-4000then droped to 28* until 5200 then back to 29* timing.
3rd gear run
tires size is 275/75/16 gears 3.73's with detroit locker.
and the exhaust is stock manifolds and y pipe. after the y pipe it goes to a 4" exhaust this is because there will be a turbo shortly and me and my freind got bored and put part of my turbo exhaust on. we figured it was better than the 2 1/2. oh and the 5.7l in sig is the ls1 not ls6 just to clear that up.
12.2:1 afr from 4000rpm up to 6300 (couldn't get it any leaner)
29* from 3000-4000then droped to 28* until 5200 then back to 29* timing.
3rd gear run
tires size is 275/75/16 gears 3.73's with detroit locker.
and the exhaust is stock manifolds and y pipe. after the y pipe it goes to a 4" exhaust this is because there will be a turbo shortly and me and my freind got bored and put part of my turbo exhaust on. we figured it was better than the 2 1/2. oh and the 5.7l in sig is the ls1 not ls6 just to clear that up.
Thread Starter
12 Second Truck Club
iTrader: (4)
Joined: Nov 2004
Posts: 6,273
Likes: 0
From: Jacksonville FL.
how often do valve seals go out i have oil on my spark plugs in number 1&3. and those two hit a 265-270 on the compression test. all others hit a 195-200.
On The Tree
Joined: Apr 2005
Posts: 151
Likes: 0
4.8T - those are some pretty good numbers for the only modifications you've made - I'd be happy with them. There's a lot of disadvantages extended cabs have to overcome, much less 4x4.
Back when I had a TBI (L98) setup I had the following (granted you have a much newer engine style being 2004):
Canfield 195cc Aluminum Cylinder heads
219/228 and .454/.480 lift @.50 (but I had 1.6:1 Harland Sharp Roller Rockers)
TBI spacer
Custom Tune
Edelbrock headers
E-Fan
This setup put 255rwhp and 310rwlbtq
Take care.
Back when I had a TBI (L98) setup I had the following (granted you have a much newer engine style being 2004):
Canfield 195cc Aluminum Cylinder heads
219/228 and .454/.480 lift @.50 (but I had 1.6:1 Harland Sharp Roller Rockers)
TBI spacer
Custom Tune
Edelbrock headers
E-Fan
This setup put 255rwhp and 310rwlbtq
Take care.
Last edited by 93ChevExt5.7; Jul 3, 2006 at 10:04 PM.
Trending Topics
Thread Starter
12 Second Truck Club
iTrader: (4)
Joined: Nov 2004
Posts: 6,273
Likes: 0
From: Jacksonville FL.
alright i guess its better than what i thought. i just thought the ls1 would yeild better numbers but i guess my drive train loss is pretty bad. what kinda drive train loss do you think i'm looking at here? 20% or more or what?
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo On The Tree
Joined: Apr 2005
Posts: 151
Likes: 0
4.8T -
You see my sig right? With this setup, I held my own right beside (and even led for about half the race) against a Dodge Charger with the 6.1liter (SRT8). My front bumper was right at his rear bumper near the end of the 1/4 mile. So if I'm getting 355rwhp with a 2 piece driveshaft and 8.5" 10-bolt (full inch larger than a camaro) and weigh 4600lbs then I'd say 20% would be (maybe a little on the)conservative side relative to your drivetrain loss.
I mean, Dodge Charger SRT8 puts 425hp @ crank and weigh around 4200lbs and they get about 13.5 in the 1/4 mile.
20% drivetrain loss with my 355rwhp puts me at about 426hp at the crank.
You see my sig right? With this setup, I held my own right beside (and even led for about half the race) against a Dodge Charger with the 6.1liter (SRT8). My front bumper was right at his rear bumper near the end of the 1/4 mile. So if I'm getting 355rwhp with a 2 piece driveshaft and 8.5" 10-bolt (full inch larger than a camaro) and weigh 4600lbs then I'd say 20% would be (maybe a little on the)conservative side relative to your drivetrain loss.
I mean, Dodge Charger SRT8 puts 425hp @ crank and weigh around 4200lbs and they get about 13.5 in the 1/4 mile.
20% drivetrain loss with my 355rwhp puts me at about 426hp at the crank.
Thread Starter
12 Second Truck Club
iTrader: (4)
Joined: Nov 2004
Posts: 6,273
Likes: 0
From: Jacksonville FL.
so what your saying is i probably have more than 20%. you have alot more than i do for sure done to yours. i mean Realistically i'm all stock with a cam. stock 4.8l manifolds and y pipe and all. ok so the more i think about the better i feel. thanks guys. lol and i did get my afr back to where it needs to be. i had a ltft of +14 in my wot ranges so no matter what i did it was adding fuel. i reset fuel trims and put my pe table back to 1.131 and loaded a stock 6.0 maf table. it ran way better the fall of at shift was allmost unnoticeable.
I wouldn't sweat it, dyno #s are nice but don't mean everything. I know a guy who used to brag about having 29x rwhp in a 4.8 and talked about how he was gonna smoke me and all that. WHO got their *** whooped at the track? Wasn't me. This is back before I had 3.90s(had 3.42s) and cut-outs. He had about a truck length jump on me out of the hole with 3.73s and a 2200 stall. I caught him at the end of first gear and pulled him hard all the way through second. My buddy was riding with me and videotaped it. I think I beat him by 1-1.2 seconds. His problem was, he didn't have any torque curve to go with the top-end horsepower of his 02' LS6 cam he was running at the time.
Your stall and heavy-duty drivetrain eats alot power up as well. Get some headers and you'd be past the 300rwhp mark. Good Luck!
Your stall and heavy-duty drivetrain eats alot power up as well. Get some headers and you'd be past the 300rwhp mark. Good Luck!
Thread Starter
12 Second Truck Club
iTrader: (4)
Joined: Nov 2004
Posts: 6,273
Likes: 0
From: Jacksonville FL.
i got my 3" to 4" adapter and my 3" coneector and three 3" t-bolt clamps and 1 4" t bolt clamp in today now just waiting on my pipe to show up and i may start the inter coole today. i'll have to kinda build it peice by piece but the inter cooler is gonna be the hardest part i think so i'll do it first. doing it this way i won't have to take anything else back apart to finish the install. just a matter of running piping and oil lines really.
So you took out the 4.8l and put in a 5.7? Did they dyno the truck in 2nd or 3rd gear?What kind of dyno?
Fix the tune before you go back.+14 L-terms is not a good thing,means the tune is way off and your wasting time at the dyno
Also your 12.2 A/F is about perfect for a heavy truck.
Fix the tune before you go back.+14 L-terms is not a good thing,means the tune is way off and your wasting time at the dyno
Also your 12.2 A/F is about perfect for a heavy truck.
Thread Starter
12 Second Truck Club
iTrader: (4)
Joined: Nov 2004
Posts: 6,273
Likes: 0
From: Jacksonville FL.
yeah there is no 4.8 any more but i like the user name so i'm keeping it lol. i cleared the trims out it was like that because i kinda screwed up the ve and everything i forgot to go back and fix it. i don't need that much fuel i don't think. there is no nock retard so why waste the fuel and power. afetr i reset fuel trims and fixed the ve and maf it pulled way harder than before on the shifts. i went to the dyno to try and fix the tune. i didn't relize it made fuel trims at wot. so i didn't get to fix the tune but when i got home i fixed it. it was a donation dyno day so for like 40 bucks i got 5 pulls. would have been more if i would have made some progress. any how it was a dyno jet and it was 3rd gear. it was a smooth pull untill about 145-150 mph then it vibed just a little bit but nothing bad.
Thread Starter
12 Second Truck Club
iTrader: (4)
Joined: Nov 2004
Posts: 6,273
Likes: 0
From: Jacksonville FL.
well i'm going back to the dyno. the first time i went the dyno computer software was screwy and it could give tq numbers just hp. the printer was also broke so i couldn't get a print off. so he said its all back up and running and i could come up for a free pull to get a graph for my base line before the turbo install.
qestion: i'm back to the stock intake tube and box because of my intercooler i installed is in the way of my other intake i had. it kinda doesn't flow as well as it did so should i just attach the maf to my throttlebody and run it once open like that or just see what i does through stock intake?
qestion: i'm back to the stock intake tube and box because of my intercooler i installed is in the way of my other intake i had. it kinda doesn't flow as well as it did so should i just attach the maf to my throttlebody and run it once open like that or just see what i does through stock intake?
