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Inches and Pounds - L98 turbo article
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Posted: 06/11/09
11:34 AM
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Guys, this was an extremely interesting article and proves that there's life in the L98 yet...
...but... (there's always a but!)
I'm struggling to understand how a BONE STOCK L98 with nothing more than a cam, long tube headers, electric water pump and FAST XFI can put out 331hp - that's almost 50% more than the stock output!
Also, getting 481hp at only 7psi doesn't seem to add up - getting that kind of figure out of a stock LSX engine would be pretty good!
Help! If this can be done, then I'm sold!
For info, I have an '88 GTA with an '86 Corvette L98 (aluminum heads), adjustable FPR (running at around 50psi), uprated ignition system (wires and coil), throttle body flow straightener and a set of ceramic coated Heddman shorty headers - soon to have an aftermarket chip fitted too...
Chris St Clair
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Posted: 06/18/09
11:09 AM
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Keep in mind this "bone stock" L98 has no accessories or emissions equipment among the other differences you listed. I'm sure the aftermarket EFI probably makes a big difference too. And getting 481hp at 7psi on a stock LS1 would actually be disappointing. A 60mm turbo could manage nearly that or above that in rwhp on an LS1 F-body, case in point HP's LS1 F-body kit is rated to 600rwhp.
Take a look at this Firebird...there is hope for your GTA.
http://www.gmhightechperformance.com/features/0707gm_1992_pontiac_firebird_formula_350/index.html
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