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Only made 720 hp with my Whipple??

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Old 05-26-2008, 06:52 AM
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Default Only made 720 hp with my Whipple??

Don't get me wrong here, not complaining, I just thought I would see more than 720 hp. Here's why. Keep in mind, Whipple advertises 740 with their stage 2 kit and a stock engine. Here is what I've got.

Hp500efi, with Dart aluminum heads, port matched to Whipple intake . Stock hp500efi cam. New 502 block deck honed and rotating assembly balanced with all bearings within tight spec. all piston rings special end gap type for specific fit. More about the build here http://www.speedwake.com/upload/show...threadid=53577

so here is the dyno pull. there will be an AFR adjustment once more around the 3000 rpm range to even it out.

So am I wrong to expect more? And again, tons of power, and I know its going to be strong, just wanted to share this with others.
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Last edited by Canada Jeff; 05-26-2008 at 06:59 AM.
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Old 05-26-2008, 09:34 AM
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You're unhappy about 20hp? There could be 20hp by simply running it on another dyno.

Personally, I'd let it eat and go have fun.
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Old 05-26-2008, 09:42 AM
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Quote:
Originally Posted by Griswald View Post
You're unhappy about 20hp? There could be 20hp by simply running it on another dyno.

Personally, I'd let it eat and go have fun.
I agree, hope your drive can take it.
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Old 05-26-2008, 09:43 AM
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753 ft lbs of torque! Enjoy the engines!
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Old 05-26-2008, 10:13 AM
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I think 720 is a more real world result than 740 unless you have a good mefi tuner at the dyno. Did you change the compression ratio when you changed the heads.
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Old 05-26-2008, 10:16 AM
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Could be the cam? A nice blower cam would make a little more. But I dunno if 20hp is worth that much time and money to change cams.
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Old 05-26-2008, 10:22 AM
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Quote:
Originally Posted by thunderusone View Post
I think 720 is a more real world result than 740 unless you have a good mefi tuner at the dyno. Did you change the compression ratio when you changed the heads.
A good tuner can make up 20 hp safely by just watching egt's and making adjustments.......Still respectable power for that package....
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Old 05-26-2008, 10:31 AM
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Let me be clear, I'm and very happy with the engine. I expected more. The stock kit is suposed to be 740 hp. So with my dart heads and port matching I thought I'd see at least more than 740hp. But I'm still very happy.

Same compresion ratio, and my tuner has recalibrated this engine over 80 times useing the MEFIBURN.COM system. Been over three weeks tuning. There was an issue with the original Whipple calibration perameters. I even bought another computer because we thought mine was fried. Turns out it wasn't.
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Old 05-26-2008, 10:32 AM
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Quote:
Originally Posted by thunderusone View Post
I think 720 is a more real world result than 740 unless you have a good mefi tuner at the dyno. Did you change the compression ratio when you changed the heads.
Thats what my builder told me. He said some dyno's can be manipulated to read more. He doesn't do this. Don't know if thats true or not.

But I repeat, I am happy with this engine.
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Old 05-26-2008, 10:39 AM
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I think a cam change would easily bring the numbers up and not hurt reliability at all.
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