This might be a tuning issue or something else. - LS1TECH

Go Back   LS1TECH > LS1-LS2-LS3-LS6-LS7 PERFORMANCE > PCM Diagnostics & Tuning
Log In 
Search


PCM Diagnostics & Tuning
HP Tuners | AutoTap | Diablo | MAF Translator | HPP3 | FAST | Gen7 | Big Stuff 3
Sponsored by
Diablo Sport


This might be a tuning issue or something else.

Reply
 
Thread Tools Search this Thread
Old 07-01-2005, 01:33 AM   #1
Staging Lane
 
Trader Rating: 0
Join Date: Dec 2004
Posts: 59
Default This might be a tuning issue or something else.

Sorry if this is in the wrong forum but I figured I would start here. Recently I had heads/cam done to my car. To be more specific refer to my signature for the modifications. The only modification that wasn't done at this time was the true dual exhaust. That was installed a couple of months earlier. What I have questions on is the fact that my rwtq just seems low. I'm not sure what modification to do next or something to look into fixing to bring the torque curve/max to a higher amount. I'm not sure if I need to supply more information. I'm still fairly new to all of this. If there is, I can ask the shop that did the build for more/different specs. Also, he found that my rear gears are 3:42. I was under the impression that the A4 cars came with a 3:23 rear gear stock. I did buy this car used so perhaps the previous owner had changed the gearing. Also, if this is in the wrong category I apologize.
vilkata is offline   Reply With Quote
Old 07-01-2005, 10:15 AM   #2
Moderator
 
jimmyblue's Avatar
 
Trader Rating: 11
Join Date: Mar 2002
Location: East Central Florida
Posts: 12,387
Default

Quote:
Originally Posted by vilkata
Sorry if this is in the wrong forum but I figured I would start here. Recently I had heads/cam done to my car. To be more specific refer to my signature for the modifications. The only modification that wasn't done at this time was the true dual exhaust. That was installed a couple of months earlier. What I have questions on is the fact that my rwtq just seems low. I'm not sure what modification to do next or something to look into fixing to bring the torque curve/max to a higher amount. I'm not sure if I need to supply more information. I'm still fairly new to all of this. If there is, I can ask the shop that did the build for more/different specs. Also, he found that my rear gears are 3:42. I was under the impression that the A4 cars came with a 3:23 rear gear stock. I did buy this car used so perhaps the previous owner had changed the gearing. Also, if this is in the wrong category I apologize.
Looks like your power is coming from RPM rather than
torque build-out, true.

Maximizing torque for a set engine configuration is
just fuel & spark. You might want to have a dyno
curve in front of you with the wideband info. Torque
responds to more spark and fatter mixture in the
midband; at the top end fat mixture will steal from
HP when the burn time gets longer than power stroke
time. Some folks run like 12.5:1 (NA) in the middle
fading to 13:1 up top. Then you tweak the spark up
to what she'll take without pinging.

Look at what the wideband says your fueling is,
relative to that. This (followed by the spark tweak)
is your best as-is hope for torque improvement.

The 2800RPM converter - any locked/unlocked
RWT/RWHP comparison? Is it inefficient and maybe
stealing some?

Have to keep an eye on the dyno operator and the
vehicle data. Seems like a lot of dynos spit out very
"processed" results, needing vehicle-specific data
(garbage in, garbage out). If you told it the wrong
tire size, gears, etc. that might (or not) bend the
reported results. You might look in the dyno section
for ideas about that, especially whether or not the
dyno in question might make an erroneous correction
based on erroneous gearing entry.
__________________


2002 SS convertible

SLP Blackwing lid, 85mm MAF, 85mm Professional Products intake & TB, SLP CME, JBAs/Mufflex tubes . SLP Y, McCord cutout, Fuddle 3500/2.0, GM truck pan, '98 flexplate, 3.42s, T-2R, MAC cover, welded tubes, Hotchkiss PHR, springs; BMR bolt-in LCA brackets, K-member; UMI TA, boxed stock 1LE LCAs, SLP Bilstein / Gabriel air shocks (F/R); Strano 35/22 sway bars, 224/224 116 cam, LT1 rad, HPTuners 12.6@112MPH
jimmyblue is offline   Reply With Quote
Old 07-02-2005, 01:24 AM   #3
Staging Lane
 
Trader Rating: 0
Join Date: Dec 2004
Posts: 59
Default

Thanks for the reply. There is a lot more to this than what it might seem on the top. I do know that it was unusually hot out the day that the dyno session took place. I'm not sure about the locked/unlocked aspect of the converter however. Right now I'm pretty happy with how the car runs. But there is always room for improvement. So I'm doing a little research to see if this is a sign of anything mechanically wrong with the car. I haven't done anything to the ignition system yet as far as parts go. So perhaps that is where I need to make the modifications next. Who knows, I guess that its only money and you can't take it with you. So let the next modification session begin!
vilkata is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


 

All times are GMT -5. The time now is 06:34 PM.


Powered by vBulletin® Version 3.8.7 AC2
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - Terms of Service - JOBS
Emails & Contact Details