New LS1 Owners - Newbie Tech Basic Technical Questions & Advice
Sponsored by:
Sponsored by:

Parasitic loss of converter

Thread Tools
 
Search this Thread
 
Old 07-23-2012, 08:11 AM
  #1  
TECH Fanatic
Thread Starter
 
LS-ONE_DAY's Avatar
 
Join Date: Jun 2007
Location: Westminster, MD
Posts: 1,062
Likes: 0
Received 2 Likes on 2 Posts

Default Parasitic loss of converter

I put this in the dyno section and have like 200 views with no responses so hopefully more people will see it and can post their experiences here.

I should soon be getting a custom torque converter built by FTI. Greg has set me up with a custom job but he has been secretive on the specs of it. He said it will fall between his SRLS0082 3200 stall speed offering and his SRLS0086 3600 stall offering. I know the 0082 has a higher STR than the 0086 does. I chose not to get my car tuned after my exhaust upgrades so I have no idea what it would be making had I gotten a tune, but I was wondering if those of you who have dyno'ed their stalled A4's can give me an idea as to how much lower the RWHP/RWTQ numbers will be that are shown on the dyno with a converter around this size (it's a 9.5" billet lockup btw).

Car set-up at the time of dyno will be:
1999 Formula (stock 4L60E, stock LS1 intake/tb, stock 10-bolt 2.73 gears, 26k miles)
ARH 1-7/8" LT's
ARH 3" ORY
Borla catback (open)
SLP Lid
EGR!/AIR!
Suspension/Chassis work - LCA's, PHB, STB, SFC's
Custom Converter w/ trans cooler
Old 07-25-2012, 05:32 PM
  #2  
LS1TECH & Trucks Sponsor
iTrader: (4)
 
Sales4@Texas-Speed's Avatar
 
Join Date: Jan 2007
Posts: 1,768
Likes: 0
Received 7 Likes on 7 Posts

Default

Are you referring to the loss between when the converter is locked and unlocked? Typically we are looking to see a difference of anywhere between 15-25 at the tire.
Old 07-29-2012, 03:52 PM
  #3  
11 Second Club
iTrader: (15)
 
LASTOFTHEBREED02T/A's Avatar
 
Join Date: Nov 2010
Location: Austin, TX
Posts: 881
Likes: 0
Received 0 Likes on 0 Posts

Default

As far as rwhp/tq loss... I dynoed 365rwhp/364tq with cam only and shorty headers, with stock trans. Once the 3800 stall and built trans went in, I made335rwhp/309Tq.
Quick math, I lost 30rwhp, and 55lbTQ... Which is a big loss, and does feel a lil bad when you looked at those numbers.

These numbers completely changed once my LT's and ORY went in.

Hope this helps
Old 08-01-2012, 06:34 PM
  #4  
10 Second Club
iTrader: (10)
 
Fbodyjunkie06's Avatar
 
Join Date: Mar 2009
Location: Greensboro, NC
Posts: 4,712
Likes: 0
Received 5 Likes on 5 Posts

Default

All Greg's stalls are custom just so you know

You will probably see 25-30rwhp loss maybe more torque, but the car will be faster.

Don't ask how it works, converters are a dark art.
Old 08-05-2012, 06:53 AM
  #5  
TECH Addict
iTrader: (2)
 
JoshuaGrooms83's Avatar
 
Join Date: Oct 2010
Location: Locust Grove, VA
Posts: 2,022
Received 95 Likes on 81 Posts

Default

yeah, my car has lt headers, ORY catted, ls6 intake and only made 301 on a dyno after the stall was installed. dont know what my stock power level was before the stall but did 14.0 @ 100mph 1/4mile stock form. get back to ya at what i could do now once i get to a good prepped track.

Last edited by JoshuaGrooms83; 08-05-2012 at 03:46 PM.
Old 08-05-2012, 08:18 AM
  #6  
TECH Addict
iTrader: (36)
 
mjs1012's Avatar
 
Join Date: Mar 2011
Location: Stratford, CT
Posts: 2,687
Received 19 Likes on 16 Posts

Default

Don't go by dyno #s in an auto. The butt dyno will feel the difference with a converter.
Old 08-05-2012, 10:32 AM
  #7  
TECH Senior Member
iTrader: (4)
 
ULTIMATEORANGESS's Avatar
 
Join Date: Mar 2003
Location: eatontown,nj
Posts: 10,976
Likes: 0
Received 17 Likes on 15 Posts

Smile

Originally Posted by mjs1012
Don't go by dyno #s in an auto. The butt dyno will feel the difference with a converter.
and your 1/4 mile times.
Old 08-05-2012, 11:07 AM
  #8  
TECH Fanatic
iTrader: (6)
 
LeanPocket's Avatar
 
Join Date: Apr 2011
Location: Corpus Christi Texas
Posts: 1,122
Likes: 0
Received 1 Like on 1 Post

Default

pay absolutely no attention to dyno numbers

I know of a certain local trans am dyno'ing 333 hp running 10 flat
Old 08-05-2012, 11:14 AM
  #9  
TECH Fanatic
Thread Starter
 
LS-ONE_DAY's Avatar
 
Join Date: Jun 2007
Location: Westminster, MD
Posts: 1,062
Likes: 0
Received 2 Likes on 2 Posts

Default

Haha nice! I guess it's kind of just an ego thing, like obviously track times are what is more important and lower the better but there's just something about seeing higher numbers that I'd like. If I could see 425rwhp out of a H/C setup with the converter I'd be happy. Right now I'm just bolt-ons though and won't be doing the engine mods for a while, I want a house first! But with the bolt-on's I'd like to keep it over 300rwhp
Old 08-05-2012, 11:30 AM
  #10  
TECH Resident
iTrader: (4)
 
SnIpEz's Avatar
 
Join Date: Sep 2009
Location: League City, TX
Posts: 979
Received 13 Likes on 13 Posts

Default

Originally Posted by LeanPocket
pay absolutely no attention to dyno numbers

I know of a certain local trans am dyno'ing 333 hp running 10 flat
Wow... An pictures/videos/more information? That's impressive
Old 08-05-2012, 03:19 PM
  #11  
TECH Addict
iTrader: (36)
 
mjs1012's Avatar
 
Join Date: Mar 2011
Location: Stratford, CT
Posts: 2,687
Received 19 Likes on 16 Posts

Default

Originally Posted by LeanPocket
pay absolutely no attention to dyno numbers

I know of a certain local trans am dyno'ing 333 hp running 10 flat
Old 08-05-2012, 03:48 PM
  #12  
TECH Addict
iTrader: (2)
 
JoshuaGrooms83's Avatar
 
Join Date: Oct 2010
Location: Locust Grove, VA
Posts: 2,022
Received 95 Likes on 81 Posts

Default

Originally Posted by mjs1012
Don't go by dyno #s in an auto. The butt dyno will feel the difference with a converter.
exactly! ^^^^

converters are for the track, not the dyno.




All times are GMT -5. The time now is 08:21 PM.