Guest Anonymous Posted November 13, 2001 Share Posted November 13, 2001 Hi all, this is my first post so far, and having read just about all the posts in this forum and a few others i thought it was time to pose my question In one of the earlier posts there was an address for sbc hp recipes which had been dyno tested. Of those there was a 383 stroker which put out 471hp and 515 torque (at the flywheel i guess), which on pump gas i believe is awesome, but then i started looking into superchargers. Now with an ATI Procharger putting out 14lbs of boost that would give a 95% increase in power (based upon 14.7lbs of boost giving 100%, which i may have misread on the procharger site) If that is correct id have 919hp and 1005 torque at the flywheel. Am i thinking properly here or do i need to tighten down the few screws i have loose? Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted November 14, 2001 Share Posted November 14, 2001 620 hp and 600 ft lbs would be much closer to the max real world with a belt driven supercharger useing pump gas,they are baseing that on a stock engine with no mods. as in 250 hp stock boosted to about 480 hp at 15 lbs boost.too get 900 hp the engine would need to have all the best forged big($$$$$) parts a 7 to 1 cpr fuel injection special fuel(like toluene or methenol) and with an intercooled twin turbo system!BTW if you want to spend money like toilet paper these people will build you a quality twin turbo 900hp engine http://www.bankspower.com/Bio.cfm http://www.callawaycars.com/ Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted November 14, 2001 Share Posted November 14, 2001 I grabbed the info for the stroker from 'Ryan's small block chevy stroker page' which in it's opening comments states "This site contains early-model street-oriented small block engines that have been run on a dyno. Since most car guys do not build many race-only engines, all of the engines on this site are streetable. Since there is so much gray area between "street" and "race," some combinations may be a little too much for the average street car. To keep streetability, all engines on this site have: Camshaft durations less than 260° @ 0.050 in. of valve lift, Readily-available GM or aftermarket heads that cost less than $1500 per pair, Compression ratios less than 11:1, and No nitrous, blowers, or turbochargers (although I see nothing wrong with any of these on a street engine—perhaps I will later create an all-power-adders section).Hopefully, you can get a good idea of the kind of power that each combination makes " http://www.ryanscarpage.50megs.com/combos2.html check out combo #15 as for the supercharger its a centrigufal from ATI Procharger, i ran through the FAQ's section to get the ratios under 'How much horsepower will a supercharger add to my engine?' http://www.procharger.com/faq.html#3 If you would run through that once for me and check my figures, if i was misled so be it. Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted November 14, 2001 Share Posted November 14, 2001 read carefully .(( If detonation forces you to use an ignition/timing retard system, you will of course see less of a gain because backing off several degrees of timing will greatly reduce an engine's power output. At higher boost levels, the heat generated by compressing air will produce diminishing returns as the boost is increased, although the use of intercooling or racing fuel can avoid this scenario of diminishing returns. Assuming the use of intercooling to run higher boost levels while maintaining reliability, )) what they are really telling you is that getting to 900hp will require intercooling and methonol alcohol or tolulene for fuel like I said!!and to pack enough fuel air mix into the cylinders to reach 900hp you will need to increase the combustion chamber voluum by dropping the compression ratio to about 7/1. Quote Link to comment Share on other sites More sharing options...
Mike C Posted November 14, 2001 Share Posted November 14, 2001 Turbo. This months Popular Hot Rodding has a street driven 89 Corvette with a twin turbo 1300 hp 406. 11 teens at 150+ mph!! Looks bone stock on the outside. With the belt driven centrifugal supercharger the other guys are right, 650 or so hp is about the best you can hope for and still drive it. Quote Link to comment Share on other sites More sharing options...
BLKMGK Posted November 14, 2001 Share Posted November 14, 2001 Couple of things to consider... HP takes airflow, th eboost number advertised doesn't mean squat. Take a "15lb" blower, put it on a 305, and it might make 18lbs of boost. Take that same blower and put it on a 406 with no pulley changes and it may make 10lbs. "Boost" is a measurement of restriction and with belt driven superchargers the amount of air the engine ingests changes the number on the gauge. Been there, done that. So, sit down and figure to how much airflow it takes to make the power number you want. Head over to one of the blower sites and figure out which blower can flow that amount of air without overspinning or getting out of it's "sweet spot" where it's most efficient. Chances are the blower you're now looking at is a race piece, the ATI unit I'm thinking you're now seeing is made of billet aluminum and costs about $6K+. What Grumpy said about detonation is also true. Even if you could flow the air needed for 900HP the octane requirements would be pretty high even with a really good intercooler bringing air temps down. A more reasonable number to shoot for would be 500 or so. My reason for saying that is that hitting that number isn't as hard and it's a number you've actually got a chance of putting to the ground without comepletely twisting your car into pieces. You could probably go higher actually but as the Darius videos show, hooking it up isn't easy! A blower or turbo, maybe a nitrous hit, are all viable paths IMO. To get that much HP and still remain streetable enough to drive without going nuts I'd go one of those routes. Would you really want something so high strung it can hardly be driven? I recently watched an LS1 putting 300RWHP down jump to over 400+ with a 100horse shot of nitrous and when not on the juice it was as streetable as a Honda! P.S. What Grumpy said regarding % of gains is right on. They make that much more power on STOCK vehicles because those vehicles are so ineffecientasthmatic to begin with. That % won't hold when you're already starting with an engine that breathes better on it's own. Think of forced induction as a beer bong, open your mouth and it drains right in. Make the pipe too big around or the height of the funnel too high and you'll choke (or worse)! Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted November 14, 2001 Share Posted November 14, 2001 Are you talking about putting that 900hp in a Z? With all due respect, if thats your intentions, its insane unless its a all out race car. Without tubing the car, putting in a 12-14 point cage all tied together to stiffen things and running massive slicks you'll just blow the tires away when the boost comes up see Darius's video for an example of what 550+ hp in a steet driven Z looks like (do a search on this site on Darius to get the link). Its a personal opinion, and I like speed as much as the next, but I urge anyone wanting to put over 500 hp in a Z to find a member with a car that has less, I think you'll be surprised to find out just how quick they are even with 400hp (hell mine only has about 260-270 hp and if I'm foolish it gets crazy). We don't touch on it much here, but people really need to consider the power to weight ratio and understand that these truly are ultra high performance vehicles and that at speed a mistake could cost you dearly, and because of the power to weight ratio it'll happen before you can blink. Just an opinion and probably not asked for, but I felt I had to say that regardless. Off safety soap box, Lone Quote Link to comment Share on other sites More sharing options...
BLKMGK Posted November 15, 2001 Share Posted November 15, 2001 Lone is correct. 600HP in a tubby car like a Camaro is pretty quick, knock 1Klbs off of that or more and you've got the weight of a Z My car, putting 300RWHP down right now, hits 50mph in second within the blink of an eye. It shoudl be making more power and I may put a turbo or blower on it even then, it'll be pretty scary I think. We'll see, EFI first then I'll decide but honestly I don't think anything more than about 500HP makes too much sense for a street driven Z. At the very least work your way up to it Quote Link to comment Share on other sites More sharing options...
Guest RON JONES Posted November 15, 2001 Share Posted November 15, 2001 Oh yea,Lone is correct.I have done a little street driving in My Z and I can tell You that the 850+ horse I have is Way more than You can use on the street. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted November 18, 2001 Share Posted November 18, 2001 I agree with blkmgk. Build up to it and then you will see how well they handle and perform with just say 300 hp. I have about 370 at the flywheel and it's really impressive. I can light them up from first to fourth with no problem if I want to. These cars are some real fun. Especially with the hp!! Quote Link to comment Share on other sites More sharing options...
BLKMGK Posted November 19, 2001 Share Posted November 19, 2001 Drove a bit the other day, short shifted into second and rolled into the gas about 3/4s. I proceeded to lay 5 feet of drag radial on the road Oops! I actually didn't mean to do it as I'm trying to take it easy on these Us but - stuff happens. I'm pretty sure my secondaries are still dormant too so.... 300RWHP is "all" I'm running so bear that in mind when considering power requirements... Quote Link to comment Share on other sites More sharing options...
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