|
 |
 |
 |
 |
 |
 |
 |
|
|||||||
|
Welcome to the TurboBuick.Com forums. You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today! If you have any problems with the registration process or your account login, please contact contact us. |
 |
|
|
LinkBack | Thread Tools | Display Modes |
May 17th, 2004, 11:52 AM
|
|||
|
|||
|
Optimal a/f
Now that WB are reasonably available and I was able to pick up a Innovate unit.
What is the optimal a/f for a turbo car? Is there such a thing  I am doing only 3rd gear WOT blast and getting high 11's a/f. But using only a butt dyno how do I know if richer is faster or vice versa. Before using o2 counts .780 was the magic number I tuned to. Just looking for the same thing. Any help would be appreciated.
__________________
87 GN J&E's, ported & polished, CC 224/218, msd 50's, THDP, pt-52, ATR headers, AC. Best time: 11.77 Best MPH: 119     
|
|
May 17th, 2004, 12:34 PM
|
||||
|
||||
|
Well, for forced induction engines, it's generally accepted that something around 12:1 is a good starting point. It may be required to go slightly richer (into the high 11:1's) but it all comes down to what your combo likes.
BTW, using a butt dyno for tuning is not exactly a safe methodl. It's good to dig out driveability issues but not changes in WOT tuning.
__________________
TurboDave EWCS(SW) USN (Ret.) My Photo Gallery Email Us Sevierville, TN TranslatorPro MAFless fuel, spark and boost management 86 GN(TranslatorPro/ExtenderPro on speed density w/boost & fuel pump control,PLX-WB) (original owner) 87 GN (second owner) 84 L69 Z28 (original owner) 01 Excursion LTD 7.3L PSD(Power Stroke Diesel), Turbo, 4X2 08 Honda Accord EX-L, 3.5V6, AT
|
|
May 18th, 2004, 10:20 AM
|
|||
|
|||
|
TurboDave,
If I'm using a WBo2 what is not safe?
__________________
87 GN J&E's, ported & polished, CC 224/218, msd 50's, THDP, pt-52, ATR headers, AC. Best time: 11.77 Best MPH: 119
|
|
May 18th, 2004, 12:32 PM
|
||||
|
||||
|
There is no magic number. Every car is different. But, I would say that if you're pushing near 12.5-12.7:1 at WOT, you may be getting dangerously lean.
A good EGT would help keep an eye on things, as well as a knock indicator of some sort.
__________________
TurboDave EWCS(SW) USN (Ret.) My Photo Gallery Email Us Sevierville, TN TranslatorPro MAFless fuel, spark and boost management 86 GN(TranslatorPro/ExtenderPro on speed density w/boost & fuel pump control,PLX-WB) (original owner) 87 GN (second owner) 84 L69 Z28 (original owner) 01 Excursion LTD 7.3L PSD(Power Stroke Diesel), Turbo, 4X2 08 Honda Accord EX-L, 3.5V6, AT
|
|
May 23rd, 2004, 08:46 PM
|
|||
|
|||
??????????
At 25#, and WFO, I have my FAST set to a commanded ratio of 11.5... Made well over 800FWHP w/ it, and the engine appears to be "happy".
|
|
May 23rd, 2004, 10:49 PM
|
||||
|
||||
|
I took my portable WB to the Nats, and hooked it up to +6 different cars. For the guys running in the 10s, seemed to run from 11.3 to 10.5. Was pretty warm, and humid so that needs taken into account.
|
|
May 26th, 2004, 03:21 PM
|
|||
|
|||
|
Thanks for the replys.
It looks like any where in the 11's is fine. So I will shoot for that and possibly richen until performance loss for safety. thanks
__________________
87 GN J&E's, ported & polished, CC 224/218, msd 50's, THDP, pt-52, ATR headers, AC. Best time: 11.77 Best MPH: 119
|
|
| Thread Tools | |
| Display Modes | |
|
|
Linear Mode
