Speedwerx Dry Pipe Question

[x2ryder]

I am installing a speedwerx dry pipe on my 98 ported 701 SJ. It has a MSD enhancer, dual cooling, Jetnetics flywheel, 44 sbn Blackjacks, and an ADA head with 35cc domes. It has 175psi. Will I be ok with 93 octane fuel with the dry pipe?

 

[oxnard111]

I would think so, but I'm not the person to ask... Where's Matt?

 

[Matt_E]

I was...with a near identical setup.

 

[MTRHEAD]

Just dont ride at 6700 rpm for long periods of time. That specific pipe design along with your MSD curve is not low enough at this point for 100% safety.

 

[junkman]

ya I grenaded an almost similar motor running the speedwerx dpipe wide open too long. I think you need something that can retard the timing alot up top before going on wide open runs across the lake I think my speedwerx pipe hit WAYYY harder than my B IMO....

 

[duckman1]

Just dont ride at 6700 rpm for long periods of time. That specific pipe design along with your MSD curve is not low enough at this point for 100% safety.

I think John means 7600...

 

[MTRHEAD]

7600 rpm is a major NO NO with that setup.

The big question is you said "ported" so what is the exhaust duration and the squish clearance ?

6700 rpm is just a bad spot in the Speedwerx dry setup "no matter what the conditions" I can show it on a dynochart or dyno developed timing curve.

You want about 15 at 7500 rpm on a Yam superstock with the speedwerx dry going down to about 7 at 9000. Drop about 23 degrees down on a MSD total loss from initial setup.