Baffled by Dyno Results

95_GTS

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95 Mustang GTS Vert current setup:

119k Stock Block, Stock Internals, all accessories
Explorer Intake (Lower Port Matched to heads)
AFR 185 Heads
1.7 Roller Rockers
XE264HR Camshaft
BBK CAI
BBK 70mm TB
Pro-M 75mm MAF (Cal'd for 30#)
30# Injectors
Walbro 255lph
BBK Equal Length Headers
BBK Offroad H-Pipe
Super 44 Catback
FRPP Aluminum Drive Shaft
FRPP 3.73
MM Full Length Subframe Connectors
MM Panhard Bar
MM Rear LCA's
Stifflers Transmission Crossmember
MM 4-point Roll Bar
H&R Sport Springs
Orange Koni Shocks, etc.

Tune/Dyno: 275whp 304wtq

6B49BA8E-CDB1-44B4-99CC-6AF63B92E754.jpeg

Thoughts??
 

ttocs

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My only thought was the heads are pretty big but I don't know enough about the cam to say if its a good combo or not.
 

Flade

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Very similar to my upcoming build for my 94GT. I am using TF170 heads. I am expecting to see 300-325 RWHP. Your results seem low. What Dyno was used? Some return lower or higher results than others. Also what tune do you have?
 

Procharged87

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I’m thinking the heads too. I think with that cam, AFR 165 heads would have been more ideal. I think 185s are much better suited to 331 and up builds.
 

ttocs

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Use stock rockers on exhaust
I was looking forward to your response to learn a little. Can you explain why this would help?

Also are you sure it was running solid? I think I would start simple and pull and inspect the plugs to see what they say is going on. Start simple.
 
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95_GTS

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Additionally, if I might add....I had almost the exact same numbers with stock 19# injectors and stock maf. Just some food for thought
 

ttocs

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Additionally, if I might add....I had almost the exact same numbers with stock 19# injectors and stock maf. Just some food for thought
This makes me wonder about the head/cam combination then as it didn't matter with more air or fuel, then I would say its something deeper.
 

Flade

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Additionally, if I might add....I had almost the exact same numbers with stock 19# injectors and stock maf. Just some food for thought
That’s not surprising. At those numbers you haven’t exceeded the limits of the injectors or MAF. That tells you the bottleneck is somewhere else.
 
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96blak54

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I was looking forward to your response to learn a little. Can you explain why this would help?

Also are you sure it was running solid? I think I would start simple and pull and inspect the plugs to see what they say is going on. Start simple.

The 1.7 rockers is making the exhaust lobe much bigger than it needs to be. Valve opens earlier, valve shuts later. Even the lift amount effects cylinder de-pressuring in a negative way.
 

white95

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I will reiterate my point;

Take it to the track!! Hell, buy a dragy and get some data on the street. A dyno is a tuning tool and they’re not always 100% accurate.

Math doesn’t lie though!!

Have your car weighed and we can plug the values into a well known formula to calculate your power level. Give it a go before you go further down the rabbit hole.
 

95_GTS

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Very similar to my upcoming build for my 94GT. I am using TF170 heads. I am expecting to see 300-325 RWHP. Your results seem low. What Dyno was used? Some return lower or higher results than others. Also what tune do you have?

Dynojet, and it's currently tuned with BE powered by CoreTuning
 

cleatus

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Looks like valve float the way it is falling off. Those heads would definitely like more cam and rpm.
 

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