This is topic car feels sluggishafter gt40 heads and explore manifold in forum Tech Talk at Northern California Ford Owners  .


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Posted by FOXX5.0 (Member # 9094) on :
 
So after installing gt40 heads off 94/95 cobra and explore manifold the car feels like it's holding back in power timing is set at 12 I did notice the TFI module position is diff then my friends mustang that's timed the same at 12
idk if that matters
Car is a 1990 mustang 5 speed
Stock air box
Stock injectors
Stock headers

Parts list of the car
Gt40 heads(stock roller rockers)
E303(idk if it was degreed)
Explorer manifold
65mm throttle body
X pipe no cats
Double roller timing chain
New plugs
New wires

It feels really slow any info would be greatly appreciated
 
Posted by 93 5.0 (Member # 12418) on :
 
I have the same set up but I have a cold air and long tubes and mine doesn't feel slow maybe you need more air flow to help them
 
Posted by FOXX5.0 (Member # 9094) on :
 
My last 93 with full exhaust and 355 gears pulled way harder then this one did maybe my stock gears are not helping either
 
Posted by CoyoteMike (Member # 13748) on :
 
quote:
Originally posted by FOXX5.0:
So after installing gt40 heads off 94/95 cobra and explore manifold the car feels like it's holding back in power timing is set at 12 I did notice the TFI module position is diff then my friends mustang that's timed the same at 12
idk if that matters
Car is a 1990 mustang 5 speed
Stock air box
Stock injectors
Stock headers

Parts list of the car
Gt40 heads(stock roller rockers)
E303(idk if it was degreed)
Explorer manifold
65mm throttle body
X pipe no cats
Double roller timing chain
New plugs
New wires

It feels really slow any info would be greatly appreciated
I would check compression, makes sure the gaskets are ok

Maybe throw some more timing at it and see how it responds? (just watch for ANY detonation)
 
Posted by FOXX5.0 (Member # 9094) on :
 
Thanks I'll give it a try
 
Posted by Marks93 (Member # 11130) on :
 
The 3.55's will help considerably. How's your exhaust system? Cats clogged? What kind of mufflers?
When I first bought mine all stock except glasspack mufflers, it was kind of a lazy dog! I changed out the glasspacks for flowmasters and it ran much better. Then adding on the 3.55's and it really woke up. Changing to 1-5/8" headers will help as well.

[ 2016-03-27, 09:08 AM: Message edited by: Marks93 ]
 
Posted by WildStangZ (Member # 10077) on :
 
24lbs injectors , needs more fuel. While ur add it, do the headers.
 
Posted by i (Member # 12534) on :
 
What spark plugs are you running? Are they gapped to .52?
 
Posted by FOXX5.0 (Member # 9094) on :
 
I'm running autolite coppers I don't remember the number but I asked for 94 cobra spark plugs at the auto part store I'll double check the gap on them
 
Posted by Blind (Member # 3052) on :
 
2.73/3.08 gears and e-cam is a great combo for a slug
 
Posted by Martinna (Member # 12493) on :
 
Check the EEC for error codes?
 




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