SuperCharger - Belt driven

[itstock]

Originally Posted by eschaider

Apologies Jason been away for a while so I did not respond promptly.

You are missing the mark here by a country mile though. The twin screw compressors have an extraordinary track record in the power production department — usually with just a larger set of injectors, MAF upgrade and fuel pump upgrade.

A personal acquaintance of mine, Harold Horton, won the Terminator / GT500 shootout last year. He used an 11 year old showroom stock engine that had never been apart or out of the car! He has raced it almost exclusively for the last eight or so years and not surprisingly won multiple events with it. His upgrades were what I spoke to in the beginning of this post. His final round performance was in the low 8.3x at middle 160's mph-wise at the Shootout.

His car weighs about 3300/3400 lbs and consistently runs 8.3x times in the low to middle 160 mph bracket. The car idles at 800 rpm and when driven on the street gets a little over 20 mpg. Now here is the best part, that is unfortunately really tough. It turns out it is a really big engine at ultra high rpm — it displaces 281 cubic inches and he shifts at between 6300 and 6500 rpm.

The car uses the original OEM ECU. The trick (if there is a trick) is the blower, the fuel supple, the injectors and knowing how to tune your engine and drive your car.

Here is a video of the car in action click here ⬇︎ Stock Cobra

It looks like he might break into the sevens this year with a freshened engine and some hot rod cams. He has already been a whisker short of 170 mph.

Not bad for an 11 year old, off the show room floor, untouched stock everything in the engine compartment except for blower injectors and fuel supply, 281 cubic inch midget motor.

Positive displacement screw blowers and people who know how to use and tune them make a BIG difference.


Ed


p.s. Imagine what an engine like that, in a car like ours, that weighed 1000 lbs less might be like ...

You are comparing one of the strongest factory stock shortblocks ever in production to "bolt this thing on your 302 and get 800hp". Speaking specifically of the 302 block, 600hp WILL require an aftermarket block or you can count your blessings every time you don't crack the block (been there done that at under 450rwhp, not to say it HASN'T been done though, just not reliably). I have also had an 03 Cobra at over 700rwhp, no problems what so ever. You are making two completely different comparisons, and you are BOTH right in regards to the particular engines that you are discussing.

Besides, twin screws/roots/rotors are notoriously HARD on engines, quite contrary to your statement.