Unfortunately when I bought my supercharger it was not at all indicated in the user manual that when tuning too much we might develop a sever HP addition. As many of you I also suffer from this HP addiction. I started with a small 5lb pulley and now I am running on a 8lb pulley.
To-day we did a couple of great runs on the 8lb pulley. The dyno guy was new and he didn’t know how to operate properly the dyno and the computer. We had to call Sean to ask him some advice. Sean was great to help us out very quickly.
I wanted to share with you some interesting dyno data. It might help other people in their tuning work.
5lb pulley:
Everything was stock on the Viper.
Runs great on 91 oct fuel and is very powerfull on 94oct fuel.
Very easy to tune and doesn’t require much retard.
Not hard at all on the engin. A lot of fun while driving.
6.5lb pulley:
Mods: 3’’ headers and exhaust, 1.7 rocker, W/M, Allum fly wheel, Roe air duct
The 6.5lb pulley is the most streetable option.
It runs great on 94 oct fuel.
Requires 10deg retard on 91 oct fuel.
8lb pulley:
Same mods as on 6.5lb pulley.
Requires very sever retard on 91 oct fuel.
Runs great on 94 oct fuel.
A lot of tire speen in lower rpms.
I will likely upgrade my wheels and tires ...
<font class="small">Code:</font><hr /><pre>
Leakdown test at 10k miles and at 30k miles
#1 8%/10% #2 7%/15%
#3 9%/10% #4 16%/18%
#5 11%/10% #6 9%/10%
#7 10%/10% #8 8%/12%
#9 11%/15% #10 10%/15%
</pre><hr />
<font class="small">Code:</font><hr /><pre>
RPM 5lb 6.5lb 8lb
hp/tq hp/tq hp/tq
============================================================
2500 181/478 261/548 286/600
3000 294/514 335/587 367/643
3500 356/529 404/606 438/657
4000 407/535 461/605 506/665
4500 432/504 510/596 562/656
5000 481/505 559/587 601/632
5500 504/481 591/565 630/601
6000 496/434 600/525 621/544
</pre><hr />
I would like to post pictures but I can't log into my VCA picture gallery ...
To-day we did a couple of great runs on the 8lb pulley. The dyno guy was new and he didn’t know how to operate properly the dyno and the computer. We had to call Sean to ask him some advice. Sean was great to help us out very quickly.
I wanted to share with you some interesting dyno data. It might help other people in their tuning work.
5lb pulley:
Everything was stock on the Viper.
Runs great on 91 oct fuel and is very powerfull on 94oct fuel.
Very easy to tune and doesn’t require much retard.
Not hard at all on the engin. A lot of fun while driving.
6.5lb pulley:
Mods: 3’’ headers and exhaust, 1.7 rocker, W/M, Allum fly wheel, Roe air duct
The 6.5lb pulley is the most streetable option.
It runs great on 94 oct fuel.
Requires 10deg retard on 91 oct fuel.
8lb pulley:
Same mods as on 6.5lb pulley.
Requires very sever retard on 91 oct fuel.
Runs great on 94 oct fuel.
A lot of tire speen in lower rpms.
I will likely upgrade my wheels and tires ...
<font class="small">Code:</font><hr /><pre>
Leakdown test at 10k miles and at 30k miles
#1 8%/10% #2 7%/15%
#3 9%/10% #4 16%/18%
#5 11%/10% #6 9%/10%
#7 10%/10% #8 8%/12%
#9 11%/15% #10 10%/15%
</pre><hr />
<font class="small">Code:</font><hr /><pre>
RPM 5lb 6.5lb 8lb
hp/tq hp/tq hp/tq
============================================================
2500 181/478 261/548 286/600
3000 294/514 335/587 367/643
3500 356/529 404/606 438/657
4000 407/535 461/605 506/665
4500 432/504 510/596 562/656
5000 481/505 559/587 601/632
5500 504/481 591/565 630/601
6000 496/434 600/525 621/544
</pre><hr />
I would like to post pictures but I can't log into my VCA picture gallery ...