well i can post the dyno charts because the graphs were off because we changed the starting rpm and when the two dynos overlay the numbers look deceiving (mustang dyno). every thing was kept the, same no adjustments and i made sure the iat was identical from the last time i was there. the bottom end as expected lost some powwer. from 2800 rpm to 5000 rpm the avg hp loss was 2-5 and tq loss was 3-6 and no more was ever lost at any rpm. The vtec engagement was smoothed out more so and was dead on in power from about 5800 to 6800 then it lost some about 1-3 hp from 6800 to 7200 and from 7300 to 8000 it was the same with a slight gain at 7800 to 8000 of about 1-2 hp. sorry i cant post charts. well this idea to say the least was unsuccessful. i was hoping to see a top end gain but oh well. guess i will have to wait for skunk. but i will say it just goes to show that a lot of people dont know what they are talking about because the motor did not fall flat on its face down low and drivability is fine. sitting behind the wheel you really cant feel the loss. on the other hand i do believe that this mod. would kill a stock motor.

 

very cool thanks for being the guinea pig. Surprised that it didn't make that much of a top end difference.

I think it's a given we have to try out a better manifold. I may have one to test in a month or too. I have a header to test next week hopefully.

It also makes me wary of sheet metal ones...cause just straight flow isn't necessarilt good.

Got a stock one to replace that with?

Were you using runner control before?

 

yes the one i took off was jun polished out and matched to the head and it was operating on the butterflys. the manifold that i modded was stock removed the butterfly plate completely but the runners were also port matched by jun.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by junbb1 &raquo;</TD></TR><TR><TD CLASS="quote">yes the one i took off was jun polished out and matched to the head and it was operating on the butterflys. the manifold that i modded was stock removed the butterfly plate completely but the runners were also port matched by jun.</TD></TR></TABLE>

What I'm trying to point out is that low end loss is likely the same amount as if you had run the JUN with the butterflies open all the time. Damn I run mine open all the time right now...maybe I should fix that.

 

what did you do w/the mani? wonder what this would do on a boosted engine