Home
What's new
Latest activity
Authors
Store
Latest reviews
Search products
Forums
New posts
Search forums
What's new
New posts
New listings
New products
New profile posts
Latest activity
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
Cart
Cart
Loading…
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Search titles only
By:
Menu
Log in
Register
Navigation
Install the app
Install
More options
Change style
Contact us
Close Menu
Forums
Engine Specific Forums
Coyote Series Engines
Cobra Jet IM #s on my Coyote Swap
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="twistedneck" data-source="post: 13709702" data-attributes="member: 130159"><p>usually lowering the kmember will make the headers hit the starter.</p><p></p><p>Man that is a nice looking car.. with the factory GT500 airflow IN should not be an issue, and technically with NA - the 2.5" pipes if they are smooth, w/o resonators and w/o cats you should have a lot of flow, however those mufflers if they are anything like the stock GT mufflers are horrific and creating back pressure. BUT Coyote engine is not very sensitive to back pressure in NA form so hmmmm. check the new S550 2015, uses the same damn muffler setup we have today with even worse routing, with resonators! </p><p></p><p>could be your tune causing the drop off make sure you have at least 120- 123 degree intake centerline and 110-114 ex. centerline at 7500 rpm (those are the CJ original tune numbers to high big rpm).. fyi on the CJ cams 139 degrees is zero advance on the intake cam and 138 is zero retard on the ex. cam. Nobody I know about should be that far even tuning for 8000 rpm.. 123 deg. is enough intake.. 110 exhaust cl is ideal for power, but going to 112 and even up to 114 will raise the rpm for peak power. on the intake valve side these tunes basically advance the shit out of the intake at the lower / mid rpms and retard it back to 120-123 at peak RPM. on the flip side the exhaust cams are about 106 cl in the mid range and 114 low and high rpm. (even high for N20 setups).</p><p></p><p>That may not be your issue at all but you have so much flow on those headers stock cam tuning is not allowing for that extra flow i.e. you have to open the exhaust valves earlier with shitty manifolds just to get that crap out of there so that hurts top end.</p></blockquote><p></p>
[QUOTE="twistedneck, post: 13709702, member: 130159"] usually lowering the kmember will make the headers hit the starter. Man that is a nice looking car.. with the factory GT500 airflow IN should not be an issue, and technically with NA - the 2.5" pipes if they are smooth, w/o resonators and w/o cats you should have a lot of flow, however those mufflers if they are anything like the stock GT mufflers are horrific and creating back pressure. BUT Coyote engine is not very sensitive to back pressure in NA form so hmmmm. check the new S550 2015, uses the same damn muffler setup we have today with even worse routing, with resonators! could be your tune causing the drop off make sure you have at least 120- 123 degree intake centerline and 110-114 ex. centerline at 7500 rpm (those are the CJ original tune numbers to high big rpm).. fyi on the CJ cams 139 degrees is zero advance on the intake cam and 138 is zero retard on the ex. cam. Nobody I know about should be that far even tuning for 8000 rpm.. 123 deg. is enough intake.. 110 exhaust cl is ideal for power, but going to 112 and even up to 114 will raise the rpm for peak power. on the intake valve side these tunes basically advance the shit out of the intake at the lower / mid rpms and retard it back to 120-123 at peak RPM. on the flip side the exhaust cams are about 106 cl in the mid range and 114 low and high rpm. (even high for N20 setups). That may not be your issue at all but you have so much flow on those headers stock cam tuning is not allowing for that extra flow i.e. you have to open the exhaust valves earlier with shitty manifolds just to get that crap out of there so that hurts top end. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Engine Specific Forums
Coyote Series Engines
Cobra Jet IM #s on my Coyote Swap
Top