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Gen 2 Boosted vs Gen 3 Boosted

BadGTR

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Hello All,

I previously had a 15 auto with a Paxton 2200, Boss intake, long tubes, Fore FS, e85 pushing 15#s to make up for my elevation (5200'). I now have a 18 auto with long tubes, Fore FS, e85 tuned pushing 12#s. Interesting comparison, my 18 made about 45-50 more rwhp with 3 less pounds of boost. I have a graph comparison, if someone can tell me how to load it up.
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Hello All,

I previously had a 15 auto with a Paxton 2200, Boss intake, long tubes, Fore FS, e85 pushing 15#s to make up for my elevation (5200'). I now have a 18 auto with long tubes, Fore FS, e85 tuned pushing 12#s. Interesting comparison, my 18 made about 45-50 more rwhp with 3 less pounds of boost. I have a graph comparison, if someone can tell me how to load it up.
I would like to see it. Well I'm not super tech savvy but the easiest way it take a picture on your cell. Then when you go to reply post click up load file. Then go to your files. Then go to the picture that's the graph or graphs. Click and it should upload.
 

PC 2015

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If it's in your email you should be able to save it or download it. Then it should be available in your files under download. Same process
 

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This is pretty normal from what everyone is seeing.

Gen 3 cylinder head ports are as cast copies of the voodoo heads which flow better than Gen 2 heads. This is similar to what Ford did with the Gen 2 ala Boss 302 heads allowing the Gen 2 to flow better than Gen 1.

Gen 3 also has more compression.
 
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BadGTR

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Hello All,

I previously had a 15 auto with a Paxton 2200, Boss intake, long tubes, Fore FS, e85 pushing 15#s to make up for my elevation (5200'). I now have a 18 auto with long tubes, Fore FS, e85 tuned pushing 12#s. Interesting comparison, my 18 made about 45-50 more rwhp with 3 less pounds of boost. I have a graph comparison, if someone can tell me how to load it up.
15 GT Auto Boosted vs 18 GT Auto Boosted.png
 

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Jay-rod427

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Not surprising, better heads, more compression, direct injection, more efficient trans.
 
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BadGTR

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Yes, not surprising. Couple of factors. The 18 tune is setup running richer and actually had 2 degrees less timing then the 15. 2 degrees on a boosted motor can be worth an easy 15+ hp and I would think the 3 additional pounds of boost running thru the Boss intake would of been huge in the 7000-8000rpm range. I was expecting to make about the same power, but am definitely happy.
 

80FoxCoupe

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Yes, not surprising. Couple of factors. The 18 tune is setup running richer and actually had 2 degrees less timing then the 15. 2 degrees on a boosted motor can be worth an easy 15+ hp and I would think the 3 additional pounds of boost running thru the Boss intake would of been huge in the 7000-8000rpm range. I was expecting to make about the same power, but am definitely happy.
Boost pressure is an arbitrary number. Especially comparing 2 different engines, and or compressors. Comparison of maf hz will give you a better idea of how much air is going into the engine.
 
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BadGTR

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Boost pressure is an arbitrary number. Especially comparing 2 different engines, and or compressors. Comparison of maf hz will give you a better idea of how much air is going into the engine.
In this case I am pretty confident the boost pressure is Apple's to Apple's. Same blowers one with a 3.00" pulley (15#s), one with a 3.33" (12#s). I ran a 3.33" on the 15 and made the exact same boost on pump 93.
 

80FoxCoupe

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In this case I am pretty confident the boost pressure is Apple's to Apple's. Same blowers one with a 3.00" pulley (15#s), one with a 3.33" (12#s). I ran a 3.33" on the 15 and made the exact same boost on pump 93.
Compare maf hz on the data log, that will tell the tale.
 

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BadGTR

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Don't need to. The blowers flow based off the pulley size.
 

Ruiner46

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How much boost you get is a function of how restrictive the intake path is after the blower. If the heads flow better for instance, then you will get less boost with the same pulley, but you will probably make more power. So 80FoxCoupe is right, MAF is a direct measure of how much air is flowing into the engine.
 
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BadGTR

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I am aware of how boost is measured and changes on different setups. I get that. I am also comparing the same blower, same pullies that both motors made the same exact boost on. Now, if the gen 3 was also on the 3.00" pulley and made 12#s, then that would be a much different story.
 

Ruiner46

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I'm confused I guess. I thought the dyno chart was the 15 with a 3" and the same setup on the 18 with the 3.33"? So, not exactly apples to apples.

Or are you trying to say that you made more power even with the larger pulley, so the 18 is just that much more efficient?

If so, it is interesting that the same pulley on both setups gives the same boost, despite the intake and head differences.
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