GT3 crank on 3.2/3.4

[Jonny042]

Originally Posted by sp_cs

The GT3 crank is a thing of beauty to behold, and to think it is (was?) less than half the price of a new 3:2 crank.

I can check the OD of the Eisenmanns this weekend. Overall quality was excellent, although there as an alignment issue with one of the outlets - an hours labour to slice and re-weld.

If you have a chance to measure it would be great. By one of the outlets, you mean the secondary connection from the header to the muffler?

Certainly seems like the 42mm HE's support a good HP number!

[sp_cs]

Re outlets, yes correct, one flange wasn’t flush with the muffler inlet.

[tabasco]

Can you share some info on the velocity stacks air filter setup? Is that available off the shelf or custom made?

And when you used the 964 plenum, where did you source the air filter setup? Gamroth?

[sp_cs]

Originally Posted by Jonny042

If you have a chance to measure it would be great. By one of the outlets, you mean the secondary connection from the header to the muffler?

Certainly seems like the 42mm HE's support a good HP number!

54.5-55mm OD - slight variation along the length, but similar side to side

[sp_cs]

Originally Posted by tabasco

Can you share some info on the velocity stacks air filter setup? Is that available off the shelf or custom made?

And when you used the 964 plenum, where did you source the air filter setup? Gamroth?

Stacks come as part of the kit with the ATPower setup.

Rothsport wouldn’t sell me the filter setup on its own, so we had one made. The filter is available off the shelf.

Mine is available for sale - plenum, resonance tube, vacuum activator, filter and the legs that join the plenum to the flange with the heads. You’d need to sort the 2 bolt adaptors for the legs to mate with - I think Jenvey may do them, or turbokraft.

[Jonny042]

Originally Posted by sp_cs

54.5-55mm OD - slight variation along the length, but similar side to side

Interesting - the older US-made SSI's I have hanging on the wall have secondaries that measure a few mm smaller than that, maybe 52-53mm OD.

The Dansk stainless muffler bolted to them has inlet tubes that are exactly 50mm OD.

Would be interesting if the eisenmann muffler has matching inlet diameters.

[lvporschepilot]

Great set up! Do you recall how much ignition timing in total is being used at WOT?

[Jonny042]

Originally Posted by sp_cs

54.5-55mm OD - slight variation along the length, but similar side to side

Part number P91130.WT42 is correct for the Eisenmann HE's? Waiting on a shipping quote for them.

Thanks and all the best!

[sp_cs]

Originally Posted by Jonny042

Part number P91130.WT42 is correct for the Eisenmann HE's? Waiting on a shipping quote for them.

Thanks and all the best!

Yup

[sp_cs]

Originally Posted by lvporschepilot

Great set up! Do you recall how much ignition timing in total is being used at WOT?

Will check

[sp_cs]

Originally Posted by Jonny042

Part number P91130.WT42 is correct for the Eisenmann HE's? Waiting on a shipping quote for them.

Thanks and all the best!

Qualification - this is the right part for SSI muffler compatible Eisenmann. The alternative is the 3.2 setup, which mandates the Eisenmann muffler

[Jonny042]

Originally Posted by sp_cs

Qualification - this is the right part for SSI muffler compatible Eisenmann. The alternative is the 3.2 setup, which mandates the Eisenmann muffler

Nope that's perfect, thanks!!! I understand the difference with the G series model. Pics on their website aren't 100% representative. The pics of yours and the pic of the part number are especially helpful, thanks again.

[sp_cs]

Couple of v quick acceleration vids, I love the way it sounds:

https://youtu.be/EKQ0eRZnCAM

https://youtu.be/50EtM1ElpQg

[QueWhy]

Originally Posted by sp_cs

Couple of v quick acceleration vids, I love the way it sounds:

https://youtu.be/EKQ0eRZnCAM

https://youtu.be/50EtM1ElpQg

Sounds fantastic in the videos.

[Mixed76]

I see that ATpower makes 911 itb's in 42 or 45mm. Which did you use? Did it match up well to the plastic plenum?

Dan

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[sp_cs]

Originally Posted by Mixed76

I see that ATpower makes 911 itb's in 42 or 45mm. Which did you use? Did it match up well to the plastic plenum?

Dan

Sent from my Nokia 7.1 using Tapatalk

45mm as they taper to 42mm at the heads, optimal for 3.2 heads; some mild port matching was also undertaken.

The 42mm taper to 40mm - I think better sized for a 3.0

We chopped the plenum legs and added silicone joiners

[Litle brother]

Great


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