Anyone using a 408 with a blower?
11-15-2005, 05:21 PM
#12
Originally Posted by parish8
how fast are you spining the whipple?
11-15-2005, 05:53 PM
#16
TECH Veteran
Originally Posted by parish8
theres no doubt about that!
That said, I wonder what off-idle torque in the 700-800 lb/ft range would feel like...
11-15-2005, 06:07 PM
#17
i found a 2300chart >> http://not2fast.wryday.com/turbo/map..._lys2300ax.pdf
looks to me like at 15000rpm it should be around 32m^3, that converts to 1130cubic foot/min. multily that by .7 and you get around 800fwhp. now deduct for drive losses(~65kw or 90hp) you end up at around 700fwhp. now deduct driveline losses of 20% and you end up at 560rwhp.
560rwhp isn't all that great for a boosted 408. it is hard to say how high you can really spin one of these units.
looks to me like at 15000rpm it should be around 32m^3, that converts to 1130cubic foot/min. multily that by .7 and you get around 800fwhp. now deduct for drive losses(~65kw or 90hp) you end up at around 700fwhp. now deduct driveline losses of 20% and you end up at 560rwhp.
560rwhp isn't all that great for a boosted 408. it is hard to say how high you can really spin one of these units.
11-15-2005, 06:45 PM
#18
Originally Posted by parish8
i found a 2300chart >> http://not2fast.wryday.com/turbo/map..._lys2300ax.pdf
looks to me like at 15000rpm it should be around 32m^3, that converts to 1130cubic foot/min. multily that by .7 and you get around 800fwhp. now deduct for drive losses(~65kw or 90hp) you end up at around 700fwhp. now deduct driveline losses of 20% and you end up at 560rwhp.
560rwhp isn't all that great for a boosted 408. it is hard to say how high you can really spin one of these units.
looks to me like at 15000rpm it should be around 32m^3, that converts to 1130cubic foot/min. multily that by .7 and you get around 800fwhp. now deduct for drive losses(~65kw or 90hp) you end up at around 700fwhp. now deduct driveline losses of 20% and you end up at 560rwhp.
560rwhp isn't all that great for a boosted 408. it is hard to say how high you can really spin one of these units.
What if I just upgrade my pistons and rods and add a cam and heads? Any thoughts on that? Is it the rods that are first to go on these engines? I dynoed at 401rwhp on 11lbs then only 416 on 15lbs. No knock. I don't think the belt was slipping much either. I think the stock manifolds and stock heads were probably the limiting factor. This is not the SAE hp. That was more like 433 or something. Bone stock I made 222rwhp.
11-15-2005, 06:48 PM
#19
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Originally Posted by parish8
i found a 2300chart >> http://not2fast.wryday.com/turbo/map..._lys2300ax.pdf
looks to me like at 15000rpm it should be around 32m^3, that converts to 1130cubic foot/min. multily that by .7 and you get around 800fwhp. now deduct for drive losses(~65kw or 90hp) you end up at around 700fwhp. now deduct driveline losses of 20% and you end up at 560rwhp.
560rwhp isn't all that great for a boosted 408. it is hard to say how high you can really spin one of these units.
looks to me like at 15000rpm it should be around 32m^3, that converts to 1130cubic foot/min. multily that by .7 and you get around 800fwhp. now deduct for drive losses(~65kw or 90hp) you end up at around 700fwhp. now deduct driveline losses of 20% and you end up at 560rwhp.
560rwhp isn't all that great for a boosted 408. it is hard to say how high you can really spin one of these units.
Those numbers pretty well jive with my latest setup. I have the 2.2L KB which is rated for 920 CFM @ 13000 rpm. Im overspinning it to about 15lbs @ 15000RPM on a 3inch pulley. The road dyno at 13lbs on Efilive shows consistently 500-520rwhp. It seems reasonably but I will need to go to dyno soon as I can get a new tranny. Once the intercooler is in, I plan to spin well into 18000rpm. The mustang guys do that all the time and get massive horsepower.
11-15-2005, 06:51 PM
#20
that blower should still be prety good at your level. i would suspect a tuning issue kept you from gaining more power. what were your a/f's? how much timing? i would first suspect very low timing.
if your set on keeping the whipple then yeah a 408 would probably be more than you need. a 370 might be a good deal for you. that would be your 6.0 block and crank but add some good rods and pistons. i see the heads as optional but heads are a controversial subject in the FI world. definately want to bump up the cam.
if your set on keeping the whipple then yeah a 408 would probably be more than you need. a 370 might be a good deal for you. that would be your 6.0 block and crank but add some good rods and pistons. i see the heads as optional but heads are a controversial subject in the FI world. definately want to bump up the cam.