Forced Induction Superchargers | Turbochargers | Intercoolers

Turbo Spool Time Increase

Thread Tools
 
Search this Thread
 
Old Oct 1, 2019 | 10:43 AM
  #1  
AGM17's Avatar
Thread Starter
On The Tree
5 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (8)
 
Joined: Jun 2016
Posts: 143
Likes: 2
From: Colorado
Default Turbo Spool Time Increase

So I have an F-body with a built LS1, 317 heads, and an On3Performance a/c delete turbo kit. The turbo is a 76mm with a .80 a/r

I have had this for about 2 years and I have decided that I would like to see if I could get a turbo that spools up basically twice as fast, along with some other changes coming down the pipe. Dumb logic says that if I want one that spools twice as fast, then do half the a/r rating and half the size. But I have no clue really. Is there anything I should be looking at when shopping turbos for specific spooling time? Anyone point me in the right direction?

Thanks!
Reply
Old Oct 1, 2019 | 10:45 AM
  #2  
ddnspider's Avatar
10 Second Club
20 Year Member
Liked
Loved
Community Favorite
iTrader: (26)
 
Joined: Aug 2004
Posts: 14,628
Likes: 1,778
From: FL
Default

What's the turbine wheel size? Auto or manual? How is it tuned?
Reply
Old Oct 1, 2019 | 10:46 AM
  #3  
Mavn's Avatar
"I MAID THEESE"
10 Year Member
Photogenic
Liked
Loved
iTrader: (3)
 
Joined: Jul 2011
Posts: 2,757
Likes: 701
From: Houston
Default

That thing should spool fast as **** LOL
Reply
Old Oct 1, 2019 | 11:03 AM
  #4  
AGM17's Avatar
Thread Starter
On The Tree
5 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (8)
 
Joined: Jun 2016
Posts: 143
Likes: 2
From: Colorado
Default

Originally Posted by ddnspider
What's the turbine wheel size? Auto or manual? How is it tuned?
Manual, top of my head I don't know the wheel size, and I was not present for the tuning. What tune info are you looking for?
Reply
Old Oct 1, 2019 | 11:11 AM
  #5  
AGM17's Avatar
Thread Starter
On The Tree
5 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (8)
 
Joined: Jun 2016
Posts: 143
Likes: 2
From: Colorado
Default

Originally Posted by ddnspider
What's the turbine wheel size? Auto or manual? How is it tuned?
Here are the 0n3 turbo specs
https://www.on3performance.com/shop/...-turbocharger/
Reply
Old Oct 1, 2019 | 11:26 AM
  #6  
ddnspider's Avatar
10 Second Club
20 Year Member
Liked
Loved
Community Favorite
iTrader: (26)
 
Joined: Aug 2004
Posts: 14,628
Likes: 1,778
From: FL
Default

Originally Posted by AGM17
A 65mm wheel on a front mount LS should spool nasty quick. Either you have an exhaust leak between the motor and the turbo or your tune needs work. You should be commanding close to NA timing and AFR until you're making a couple PSI, then drop the timing and richen the AFR. What does it spool at now?
Reply
Old Oct 1, 2019 | 11:27 AM
  #7  
JoeNova's Avatar
Restricted User
 
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
Default

Those things instaspool on an LS1. Where is it spooling at now?
Reply
Old Oct 1, 2019 | 11:31 AM
  #8  
AGM17's Avatar
Thread Starter
On The Tree
5 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (8)
 
Joined: Jun 2016
Posts: 143
Likes: 2
From: Colorado
Default

Originally Posted by ddnspider
A 65mm wheel on a front mount LS should spool nasty quick. Either you have an exhaust leak between the motor and the turbo or your tune needs work. You should be commanding close to NA timing and AFR until you're making a couple PSI, then drop the timing and richen the AFR. What does it spool at now?
Just driving it around I feel full spool around 3800 RPM, maybe a little less, driving hard and watching the dash is tough

Maybe it's being greedy but I don't see why I couldn't feel full boost at 3k rpm or less.

The AFR is 14.7 until i see about 2 psi. Unsure about the timing, I could ask about that
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Oct 1, 2019 | 11:36 AM
  #9  
ddnspider's Avatar
10 Second Club
20 Year Member
Liked
Loved
Community Favorite
iTrader: (26)
 
Joined: Aug 2004
Posts: 14,628
Likes: 1,778
From: FL
Default

Originally Posted by AGM17
Just driving it around I feel full spool around 3800 RPM, maybe a little less, driving hard and watching the dash is tough

Maybe it's being greedy but I don't see why I couldn't feel full boost at 3k rpm or less.

The AFR is 14.7 until i see about 2 psi. Unsure about the timing, I could ask about that
I would shoot for NA WOT AFR (like mid 12's) and see what it does. And timing matters, especially on a stick car.
Reply
Old Oct 1, 2019 | 11:38 AM
  #10  
AGM17's Avatar
Thread Starter
On The Tree
5 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (8)
 
Joined: Jun 2016
Posts: 143
Likes: 2
From: Colorado
Default

Originally Posted by ddnspider
I would shoot for NA WOT AFR (like mid 12's) and see what it does. And timing matters, especially on a stick car.
At WOT and full boost it's about 11.5 AFR
Reply
Old Oct 1, 2019 | 12:09 PM
  #11  
JoeNova's Avatar
Restricted User
 
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
Default

You're going to need a way to datalog to get the exact RPM numbers.
3800 is extremely late for a single 7665 on an LS1. That's where my 4.8 spools my quads.
Reply
Old Oct 1, 2019 | 12:28 PM
  #12  
ddnspider's Avatar
10 Second Club
20 Year Member
Liked
Loved
Community Favorite
iTrader: (26)
 
Joined: Aug 2004
Posts: 14,628
Likes: 1,778
From: FL
Default

Originally Posted by AGM17
At WOT and full boost it's about 11.5 AFR
Try setting it to 12.5 until you have a few psi, then drop to 11.5. And check on timing.
Reply
Old Oct 1, 2019 | 01:08 PM
  #13  
SLOW SEDAN's Avatar
8 Second Club
iTrader: (13)
 
Joined: Jan 2010
Posts: 4,025
Likes: 952
From: No VA
Default

Originally Posted by AGM17
Just driving it around I feel full spool around 3800 RPM, maybe a little less, driving hard and watching the dash is tough

Maybe it's being greedy but I don't see why I couldn't feel full boost at 3k rpm or less.

The AFR is 14.7 until i see about 2 psi. Unsure about the timing, I could ask about that
14.7, who tuned this thing? Poor thing needs fuel to make power to get going! Should be 12.8 or so tipping in to WOT NA (95-100kpa), hold 12.5 or so for a few psi, then taper down to your desired max boost at 11.5 (which it seems that part is there, sounds like you just need to work on the middle).

Like others said, your 7665 should spool pretty damn fast. Are you using a boost controller? What boost?

Reply
Old Oct 1, 2019 | 01:58 PM
  #14  
gsteele's Avatar
TECH Enthusiast
10 Year Member
Liked
 
Joined: Mar 2013
Posts: 503
Likes: 38
Default

Originally Posted by AGM17
Just driving it around I feel full spool around 3800 RPM, maybe a little less, driving hard and watching the dash is tough

Maybe it's being greedy but I don't see why I couldn't feel full boost at 3k rpm or less.

The AFR is 14.7 until i see about 2 psi. Unsure about the timing, I could ask about that
If you are not data logging and are just "feeling", how do you know that you are not at full boost? Depending on what "full boost" means, you also will not achieve it in whatever gears you are traction limited.
Reply
Old Oct 2, 2019 | 10:20 AM
  #15  
AGM17's Avatar
Thread Starter
On The Tree
5 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (8)
 
Joined: Jun 2016
Posts: 143
Likes: 2
From: Colorado
Default

Originally Posted by SLOW SEDAN
14.7, who tuned this thing? Poor thing needs fuel to make power to get going! Should be 12.8 or so tipping in to WOT NA (95-100kpa), hold 12.5 or so for a few psi, then taper down to your desired max boost at 11.5 (which it seems that part is there, sounds like you just need to work on the middle).

Like others said, your 7665 should spool pretty damn fast. Are you using a boost controller? What boost?
The car is mainly a street car, which gets driven daily. The desire for a 14.7 ratio was to keep the mpg in check so that trips to the station didn't happen daily. I will put 300 miles on this car in one day, just high way driving if i have things to do that day.

Manual boost controller, currently it pushes 13psi at WOT
Reply
Old Oct 2, 2019 | 10:25 AM
  #16  
ddnspider's Avatar
10 Second Club
20 Year Member
Liked
Loved
Community Favorite
iTrader: (26)
 
Joined: Aug 2004
Posts: 14,628
Likes: 1,778
From: FL
Default

Your idle and cruise AFR should NOT be your WOT AFR.
Reply
Old Oct 2, 2019 | 10:42 AM
  #17  
LSX Power Tuning's Avatar
FormerVendor
iTrader: (4)
 
Joined: Mar 2013
Posts: 2,367
Likes: 26
From: Brenham TX
Default

Timing and fueling have a HUGE effect on spooling.
Reply
Old Oct 2, 2019 | 11:19 AM
  #18  
SLOW SEDAN's Avatar
8 Second Club
iTrader: (13)
 
Joined: Jan 2010
Posts: 4,025
Likes: 952
From: No VA
Default

Originally Posted by AGM17
The car is mainly a street car, which gets driven daily. The desire for a 14.7 ratio was to keep the mpg in check so that trips to the station didn't happen daily. I will put 300 miles on this car in one day, just high way driving if i have things to do that day.

Manual boost controller, currently it pushes 13psi at WOT
Almost all the cars here are street cars, doesn't mean they cant be tuned to run optimally. Stoich cruise, throttle tip in and WOT A/F are completely different things.

Usually an electronic controller will get things spooled quicker then a manual one. But I would fix the fueling before you go throwing more boost at it faster.


Originally Posted by ddnspider
Your idle and cruise AFR should NOT be your WOT AFR.
Right! LOL Although in the LSA world I've seen some tuners not have them far off.
Reply
Old Oct 2, 2019 | 11:45 AM
  #19  
AGM17's Avatar
Thread Starter
On The Tree
5 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (8)
 
Joined: Jun 2016
Posts: 143
Likes: 2
From: Colorado
Default

Originally Posted by ddnspider
Your idle and cruise AFR should NOT be your WOT AFR.
WOT = 11.5-12
Idle = 14.7
Reply
Old Oct 2, 2019 | 11:47 AM
  #20  
SLOW SEDAN's Avatar
8 Second Club
iTrader: (13)
 
Joined: Jan 2010
Posts: 4,025
Likes: 952
From: No VA
Default

Originally Posted by AGM17
The AFR is 14.7 until i see about 2 psi. Unsure about the timing, I could ask about that
Originally Posted by AGM17
WOT = 11.5-12
Idle = 14.7
You said your setup was lean until 2PSI and want faster spool, the ramp between 14.7 and 11.5 greatly impacts that!
Reply



All times are GMT -5. The time now is 06:15 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE