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Whipple 1075sci upgrade

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Old 04-17-2010, 07:18 AM
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After further testing, 150hp with 91-octane, 175hp on 93 octane. 75lbs of torque increase. EGT'2 50deg cooler, air fuel per cylinder .25 from high to low (factory has #8 1 full air fuel ratio leaner), egt's 50deg from high to low.
thats awesome, so in theory one could take their own long blocks and purchase everything from you and get a set of 1075 comps and be a very happy camper with an engine comparable to a 1075 but with some advantages... i like that idea.
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Old 04-17-2010, 12:15 PM
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Thought you guys would want to see our new upgrade for the 1075sci. Replaces the stock 2.3L dual superchargers with dual 2.9L superchargers.



Comment:

This may be an over simplified question but why not just eliminate both superchargers and place a 8.3 unit on the same engine modify the pulley system and get 8.3 litres of sc power in a single unit.

Easier tuning and management etc...

The 2.9 plus 2.9 do not exceed the volume of your 8.3 unit. The only reason I can think of is pulley changes would be too difficult and customer wanting to retain the dual sc aspect of the engine ie...for re-sale.

Can you elaborate on the rationale.

Thanks,

KAP
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Old 04-17-2010, 12:57 PM
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Any of this translate to the 850 sci? Looked at doing stage 1 for the 80lbs and 6,500 but curious what else your cooking up?
Cam, springs, belt and pulleys and we can take you to 1100hp. Add our new SC's and your pushing over 1200hp.
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Old 04-17-2010, 01:07 PM
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Comment:

This may be an over simplified question but why not just eliminate both superchargers and place a 8.3 unit on the same engine modify the pulley system and get 8.3 litres of sc power in a single unit.

Easier tuning and management etc...

The 2.9 plus 2.9 do not exceed the volume of your 8.3 unit. The only reason I can think of is pulley changes would be too difficult and customer wanting to retain the dual sc aspect of the engine ie...for re-sale.

Can you elaborate on the rationale.

Thanks,

KAP
The belt system is too difficult to get right. Can't run the 8.3L on 12-rib. Also height and just overall packaging was incredibly tough. I did look at it.

These SC's are upgraded in many ways as well so they can give boaters far more trouble free operation.
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Old 04-17-2010, 02:36 PM
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Nice work dustin!

Also, regarding the question about the 8.3 blower....... Correct me if I'm wrong, but the 8.3 blower is the same as the 5.0, just having the opposite rotor driven?
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Old 04-17-2010, 03:59 PM
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Nice work dustin!

Also, regarding the question about the 8.3 blower....... Correct me if I'm wrong, but the 8.3 blower is the same as the 5.0, just having the opposite rotor driven?
Yes, exactly.
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Old 04-17-2010, 05:42 PM
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Yes, exactly.
what would you estimate hp on a set up like this. 509CI, AFR 325 heads 8.8/1 compression, 525 style cam with 8.1 firing order with either your 4.0 and a moac cooler, or this new dual set up...on pump gas, and your opinion on the reliability of it?
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Old 04-18-2010, 12:20 AM
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Dustin just did one like you described... 1023 hp.

http://www.youtube.com/watch?v=h8k8_...eature=related

and my Whipple modified 600sci... 502 cu/inch .. ported stock heads .. closed cooled .. 960 hp

http://www.youtube.com/watch?v=Sl8M-AI-ZrM

Chris

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Old 04-18-2010, 10:17 AM
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very cool, great job on both of them dustin, thanks for your threads Chris, gives me plenty to think about. and both of those are on pump gas 91/93?
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Old 04-18-2010, 03:47 PM
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Both on 91 pump gas

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