yamadooman
Extreme
- Joined
- Jan 16, 2005
- Messages
- 62
- Reaction score
- 18
- Points
- 858
- Location
- New Prague, MN
- Country
- USA
- Snowmobile
- 2023 SRX
Was running 137.5's and had A/F mixture of 10.8:1, dropped to 130's and now am in the 13.5 range.. I figure 132.5's should give me approx. 12.5:1.. Is this too lean? or just perfect? I could go to 133.8's and get down in the 12: 1 range.. Any advice would be appreciated.. Pretty new to this boost thing.. Chad
Bossman
Expert
12.7 is the leanest you want to go. If you can hit 12.1that is were I would go.
Skydog
TY 4 Stroke God
not much power to gain by running 12 i have a friend with a dyno at his house he said cars with blowers only gain a few HP from 11.5-12.00
My sled is at 11.0 at 12psi at wot. Sled rocks!! I have put it to 11.8 but sled pulls the same rpm and runs the same! So i stick with 11.0-11.2 safe safe safe! This is just me! I dont need ever little HP sled is way to fast for a trail sled any way! And i have about 4-5 psi left! Every two stroke i have run i just flat out KILL!!
Skydog
Skydog
My sled is at 11.0 at 12psi at wot. Sled rocks!! I have put it to 11.8 but sled pulls the same rpm and runs the same! So i stick with 11.0-11.2 safe safe safe! This is just me! I dont need ever little HP sled is way to fast for a trail sled any way! And i have about 4-5 psi left! Every two stroke i have run i just flat out KILL!!
Skydog
Skydog
Chad, could you tell a big difference when you leaned it down from 10.9 to 13.5? Did it pull any more RPM on top with jet Change?
Doug
Doug
bump - come on guys - somebody should have an opinion
yamadooman
Extreme
- Joined
- Jan 16, 2005
- Messages
- 62
- Reaction score
- 18
- Points
- 858
- Location
- New Prague, MN
- Country
- USA
- Snowmobile
- 2023 SRX
Doug, it did pull a little more RPM, and did start ratcheting the track, so I'm sure it was making more hp.. I've since gone to 135's and now it is in the 12.3:1 range.. That is exactly where I wanted.. It is pulling about 10,200-10,300 now, up from around 10,000... Should be faster... Will find out this weekend.. I'm going riding with a bunch of Mach Z's and a modded ZR 900.. Time will tell..
