494whp with the Laser. HKS 272 vs Comp 100.

[Lowell Foo]

[Richard Steger]

Nice graphs!  Which Run# is which cam brand/grind?

[Lowell Foo]

Nice graphs!  Which Run# is which cam brand/grind?

Run #2 is the Comp 100's @ 474whp.  Dashed lines.

This car still has the same bolt on 50 trim turbo and one of my ported stock intake manifolds along with a stock throttle body. 

[Lowell Foo]

Just for comparison, this is a bone stock 4th gen Viper rated 600hp @ 6000rpm, 560ft/lbs @ 5600rpm.

[Richard Steger]

Interesting tradeoff between the 2 cams, eh? More peak torque that drops off sooner vs more power that stays on till rev limiter.

 Are your dyno pulls made using 94 pumpgas?  I've been dying to ask this question for a long time...How much power can be made on a 4g63, awd car that can be driven every day, all year, in all weather conditions on 94 pump gas? ... and what mods would you recommend for this goal?

 Regarding the viper, pretty amazing amount of torque at only 2 grand, but for the price and the displacement of the engine, makes the 4g63 look real good!  

[Lowell Foo]

Cams are one of those mods where you can't have something for nothing.  The car feels noticeably slower until above 7k so it's a tough choice.  

My cars run 94 pump gas with 100% methanol spray on the street and at the track.  If you're building a car strictly for pump fuel you'll have to have an efficient turbo/motor combo as you're limited on peak cylinder pressure before knock rears it's ugly head.  Not surprisingly the best pump gas 4G's here have been strokers, and I think 385whp is the record.  

Here's a comparison of a fully dressed stroker motor (Scott's old blue car) on pump gas and 19psi vs my Evo16g car w/ stock 7.8cr bottom end and an AEM meth kit.  I forgot to include the # box, but the green lines are boost pressure.  With a 9:1 bottom end, I'm confident the Evo16g can make around 360whp.  Additionally this car still has a stock untouched head casting, stock valves/springs/retainers, stock unported o2 housing, balance shafts intact, and the turbo is not ported or clipped.   

[Kristopher Rozon]

Stock head I assume, but were both degree'd at all or on stock gears straight up?  I believe on a stroker the results could potentially be different but I'm not 100% on that.

[Lowell Foo]

Stock head I assume, but were both degree'd at all or on stock gears straight up?  I believe on a stroker the results could potentially be different but I'm not 100% on that.

Head on the Laser is unported, but has upgraded valves, springs and retainers.  Both cams were optimised on timing.

[Brett Haviland]

nice!! almost 500 WHP on that setup!

any other tricks in the bag to get her to the magic 500 number?

[Lowell Foo]

[quotejavascript:void(0); author=Brett Haviland link=topic=22552.msg190958#msg190958 date=1261779906]
nice!! almost 500 WHP on that setup!

any other tricks in the bag to get her to the magic 500 number?
[/quote]

Electric supercharger! 

I may try version 2 of my ported stock intake manifold, and I'd like to try a 63mm throttle body as well.  Comp 200 cams might also do the trick.  For more work, some head porting would certainly do the trick, as would a sheet metal intake manifold but I'm not ready to lose the mid range torque of the stock intake manifold.

[Remi Raymond]

[quotejavascript:void(0); author=Brett Haviland link=topic=22552.msg190958#msg190958 date=1261779906]
nice!! almost 500 WHP on that setup!

any other tricks in the bag to get her to the magic 500 number?

Electric supercharger! 

I may try version 2 of my ported stock intake manifold, and I'd like to try a 63mm throttle body as well.  Comp 200 cams might also do the trick.  For more work, some head porting would certainly do the trick, as would a sheet metal intake manifold but I'm not ready to lose the mid range torque of the stock intake manifold.

[/quote]

 I know someone who has a 70mm bolted to a SMIM that wants to get rid of both

[Lowell Foo]

I'll dyno test it, but I have yet to see a SMIM I'd want on my daily driver. 

[Zach Holt]

nvm

[Rob Armstrong]

I never really looked that closley at a dyno graph before, always figured they were only good for getting a HP #'s but I now see a benifit is you learn propper shift points.
Now this is really the my first crack at this but with the HKS's (solid lines) max HP is @7400+/- and max TQ is @ 5300 considering you lose about 1000-2000 per shift you would want to be shifting around 7300 rpm?
Am I in the ball park at all on this?

[Lowell Foo]

You want to have the maximum area under the power curve, which means shifting somewhat past your peak HP rpm.  With the Comp 100's I was shifting at 77-7800rpm and the HKS 272s work best shifted at 8500. 

http://www.datsuns.com/Tech/whentoshift.htm

The Viper actually wastes some potential due to hitting the rev limiter at peak HP.