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Jun 22, 2014, 09:49 PM
" I only fly Davebuilt"
wrjames38's Avatar
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91 EF Yak/DA70 with ES Composites tuned pipes


We planned on doing my EF 91" Extra first... but my buddy Dave showed up today with 2 ES composite 35 cc carbon tuned pipes STUFFED into his new EF Yak. We got the 60 mm drop headers from DA and used stock length! Motor ran very well with great transition and a 350 rpm increase over the stock Jtec mufflers. I will get more date as we get my plane setup and more flying time....so far looks very promising!

DA70...broken in
60 mm drop headers from DA
ES Composite 35 cc tuned pipes
Redline 40:1 on 91 pump gas
25X8 EVO mejzlik
6850 rpms ( still a little rich) no sag on full throttle upline
I think over 7000 when motor gets fine tuned
I'll get pics up shortly

James
Last edited by wrjames38; Jun 22, 2014 at 10:42 PM.
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Jun 23, 2014, 03:09 PM
Сделайте Америку Великой Снова
7oneWo1f's Avatar
Cool.
Jun 23, 2014, 03:10 PM
↓↘→ + (punch)
theKM's Avatar
hot... are those pipes going to be able to keep cool?
Jun 23, 2014, 03:40 PM
Jus 1 more plane is all I need
NashVegas's Avatar
I have an EF 91" Yak with a DA 70 on the bench right now. This would be a good time to install.

I don't see the 60mm drop headers listed on the DA website. How much did they cost?
Jun 24, 2014, 05:26 AM
Why you type so loud?
Generic Member's Avatar
Sub
Jun 25, 2014, 09:17 AM
Jus 1 more plane is all I need
NashVegas's Avatar
Quote:
Originally Posted by wrjames38
We planned on doing my EF 91" Extra first... but my buddy Dave showed up today with 2 ES composite 35 cc carbon tuned pipes STUFFED into his new EF Yak. We got the 60 mm drop headers from DA and used stock length! Motor ran very well with great transition and a 350 rpm increase over the stock Jtec mufflers. I will get more date as we get my plane setup and more flying time....so far looks very promising!

DA70...broken in
60 mm drop headers from DA
ES Composite 35 cc tuned pipes
Redline 40:1 on 91 pump gas
25X8 EVO mejzlik
6850 rpms ( still a little rich) no sag on full throttle upline
I think over 7000 when motor gets fine tuned
I'll get pics up shortly

James
The ES website says that the ES35 pipes are 2" in diameter. The EF 91" Yak exhaust box is less than 4".

How did your buddy get 4"'s of pipes in the box? Did he expand it?


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