PA dyno day Sheets and Pics

[ACELLR8]

Post pics from our PA dyno day and dyno sheets here. This is at Xotic Motor Sports in Gap PA, for anybody in the North East that wants an all wheel dyno this is an all wheel dyno.

Naturally Aspirated / Very Very Lean

150 Shot (Used 150 shot N2O jet, and 200 shot fuel jet to fatten up)

95 Gen I on dyno

93 Gen I on dyno (Redenuff93)

 

[Viper Wizard]

Cool! Thanks Ed!

 

[RedEnuf93]

Since you asked for it....

 

[VIPER D]

I love n2o vipers.

 

[FinalEd357]

Unreal #s guys! Congrats on a few sweeeet snakes!

 

[DrumrBoy]

Red. Nice numbers!

Gotta question about your A/F as its somewhat the shape of my curve. Starts out real lean (16/1+)and then drops steadily to 12 over the next 2000 rpm.

Have you determined what causes yours to start out so lean?

 

[ACELLR8]

I love n2o vipers.

SHOW OFF!!

 

[RedEnuf93]

"Red. Nice numbers!
Gotta question about your A/F as its somewhat the shape of my curve. Starts out real lean (16/1+)and then drops steadily to 12 over the next 2000 rpm. "

I am not sure, I need to go dyno more times to see what can be done. Mine was pig-rich in the beginning, see my earlier posts, expecially with the 200HP shot:
http://vca2.viperclub.org/forums/showflat.php?Cat=&Board=UBB14&Number=431358&Forum=All_Forums&Words=3114&Match=Username&Searchpage=2&Limit=25&Old=allposts&Main=431358&Search=true#Post431358

The 52NX and 33 Fuel added up to about 68% fuel, where as the 100 jet and 150jet mixtures are about 51-52%....? Go figure? Mine was so rich it dropped off the charts.

So I desided to make a 57 NX jet to compensate the 68 mixture. It seemed to work well, since the "bogging" I experienced dissapeared completely, motor run cleaner throughout the RPM range and it had a VERY smooth curve. It was still at 10.5 Air fuel ratio, so few ponies can be made there by leaning it out a bit more to 11-12 range.

All runs, with NX or without NX seem to start at 16 range and then taper to about 12.

 

[YouWish]

Who is the poor guy who can't afford a shirt?

 

[KERS-VPR]

Who is the poor guy who can't afford a shirt?

since he and his wife both have Vipers, I was just glad he had pants on.

 

[ACELLR8]

Red. Nice numbers!

Gotta question about your A/F as its somewhat the shape of my curve. Starts out real lean (16/1+)and then drops steadily to 12 over the next 2000 rpm.

Have you determined what causes yours to start out so lean?

I am no expert, but it seems to me that all the vipers on the dyno were lean under idle and before a load was put on the engine. Being there is no load on the engine I don't really think it is a big deal.

Here is a dyno sheet for my wife's GTS, which also started out lean.

 

[ACELLR8]

Who is the poor guy who can't afford a shirt?

since he and his wife both have Vipers, I was just glad he had pants on.

I was really hoping to borrow your pink cut off shorts!!

Where are the pics I took of your car with your camera?

 

[YouWish]

Who is the poor guy who can't afford a shirt?

since he and his wife both have Vipers, I was just glad he had pants on.

lol

 

[DrumrBoy]

Red. Nice numbers!

Gotta question about your A/F as its somewhat the shape of my curve. Starts out real lean (16/1+)and then drops steadily to 12 over the next 2000 rpm.

Have you determined what causes yours to start out so lean?

I am no expert, but it seems to me that all the vipers on the dyno were lean under idle and before a load was put on the engine. Being there is no load on the engine I don't really think it is a big deal.

Here is a dyno sheet for my wife's GTS, which also started out lean.



Red and Accel, thanks for the comments and leads. Most of the curves I see posted have a very flat A/F curve...mine is almost exactly like the sheet posted above. I'm playing with the VEC 1 to see if I can flatten it a bit; have to go back to the dyno to see if it has the desired effect, very tough to "feel" the difference.