Guest GoaTSLonG Posted May 6, 2003 Share Posted May 6, 2003 What do you guys think is a better choice, A procharged LS1 (like Darius has)with a T-56 six speed or an RB26DETT with a RB25DETT 5 speed? My HP goals are around 500-700 streetable, weekend driver, weekend track car HP. This will be going in a 240z. Quote Link to comment Share on other sites More sharing options...
Guest Your Car is Slow Posted May 6, 2003 Share Posted May 6, 2003 reaching the upper HP limit of the LS1 block at those numbers. Pretty sure Darius has an LT1 Quote Link to comment Share on other sites More sharing options...
Mudge Posted May 6, 2003 Share Posted May 6, 2003 Darius runs an LT1 and I HIGHLY doubt its stock bottom, if it is then he is amazingly lucky to have it hold together. You will not be running much boost on a stock LT1 or LS1 without high risk of short rod life, if you dont lose a piston first. 500 HP is not such a big deal, going north of that is where the risk lies - you'd be best to rebuild if you went with an LS1. Unlike Ford, these engines are built with high compression and should really remain NA unless you open em up. Quote Link to comment Share on other sites More sharing options...
Dayz Posted May 6, 2003 Share Posted May 6, 2003 Darius has a LT1 engine, non stock bottom end. Go on his website http://www.darius240z.com , don't forget that this car isn't only an engine , and he said that he has to much HP Quote Link to comment Share on other sites More sharing options...
Mudge Posted May 6, 2003 Share Posted May 6, 2003 If you look at the numbers, its the truth. With his new wheels, he should have substantially more grip than the teeny 8" ers before. Quote Link to comment Share on other sites More sharing options...
Guest Your Car is Slow Posted May 6, 2003 Share Posted May 6, 2003 I dont see an LS1 holding together with ANY sort of bottom end above 600hp. Quote Link to comment Share on other sites More sharing options...
Mudge Posted May 6, 2003 Share Posted May 6, 2003 Not sure that I agree with that, but it is aluminum - if you really want big numbers go with an iron block. If nothing else you at least will avoid some twisting forces, which will cause wear and possible failure. Quote Link to comment Share on other sites More sharing options...
Guest zfan Posted May 6, 2003 Share Posted May 6, 2003 LS1's are all forged bottom ends. They can handle a procharger as I know two people with them on their SS/Z28 combo's. 600 ponies. Better to go that way than to spray it. Mike Quote Link to comment Share on other sites More sharing options...
Phantom Posted May 7, 2003 Share Posted May 7, 2003 Procharger Literature indicates that they have taken the Corvette LS6 - basically a modified LS1 - all the way to 700 HP with excellent performance. Call them and get ready with a check for about $8,000. I'd go the LS1 route every day of the week. There is no replacement for displacement. Quote Link to comment Share on other sites More sharing options...
Guest Your Car is Slow Posted May 7, 2003 Share Posted May 7, 2003 where as the LT1 block is good for over 1000hp Quote Link to comment Share on other sites More sharing options...
stony Posted May 7, 2003 Share Posted May 7, 2003 well since knowone has said anythig about it yet... the rb26 is good for 600+ with bolt ons. ie turbo , fuel system, ect ect . anything above that pistons, rods, cams and a head gasket are in order and will get you in teh 700 range anything above that youll need more extensive bottem end work along with head work but will still be streetable car on pump gas!!!!! Quote Link to comment Share on other sites More sharing options...
BRAD D Posted May 7, 2003 Share Posted May 7, 2003 Stony, how streetable is your setup? You should have around 450-475hp at the flywheel. Quote Link to comment Share on other sites More sharing options...
Mudge Posted May 7, 2003 Share Posted May 7, 2003 LS1's are all forged bottom ends. They can handle a procharger as I know two people with them on their SS/Z28 combo's. 600 ponies. We all know how fabulous factory forged rods are As for the pistons they are hypereutectic, not forged - your thinking Ford. The ringlands are even smaller than the LT1, sorry man but you are smokin some good stuff to think they will suck up 600 HP easily. Quote Link to comment Share on other sites More sharing options...
Mudge Posted May 7, 2003 Share Posted May 7, 2003 where as the LT1 block is good for over 1000hp Yeah, it eats more power than an SBC however, but it seems generally accepted that 1300 HP is about the limit before having the block seperate on you Quote Link to comment Share on other sites More sharing options...
Guest tt350 Posted May 7, 2003 Share Posted May 7, 2003 Why does the LT1 eat more power than an SBC. Thicker casting? Quote Link to comment Share on other sites More sharing options...
stony Posted May 7, 2003 Share Posted May 7, 2003 my car is very streetable, basically a stock drivetrain with bigger injectors and booste turned up . stock booste is 8 psi i think and i currently have it tuned at 15 psi. so out of booste it drives as any other car. actually gets decent mileage as long as i stay out of the booste. once i upgrade turbos should get over 500rwhp at the same booste levels. btw i plan driving it daily as soon as i get air filter fitted which should be next week. finally got the blowoff installed along with the pieces that bolt on to the turbos to allow air filters to be clamped on. Quote Link to comment Share on other sites More sharing options...
Mudge Posted May 7, 2003 Share Posted May 7, 2003 No way, its a thinner block. The cap design is what eats power, the front apperantly is the worst. Here is a snippet of info from one of George Baxter's buddies, who has a fairly fast LT1 in his own right. Just remember... an S/C application imposes greater loads on the block than a turbo for a given net flywheel HP output. The S/C drive HP has to come from power made through the crankshaft. When George was netting 1,125HP at the flywheel, he was probably taking 150-175HP off the front of the crank... meaning the combustion chambers were making closer to 1,300HP. When the issue of LT1 block limits has been discussed before, Madman claimed to be making 1,200HP with his ATI setup. Neither George or Madman suffered a catastrophic failure, but they had the benefit of seeing the condition of the block when they tore things down. They both came to the same conclusion... don't push it any farther. If I can jog my memory on how to search for other comments of his on friction I'll post up. Quote Link to comment Share on other sites More sharing options...
Guest GoaTSLonG Posted May 7, 2003 Share Posted May 7, 2003 the rb26 is starting to grow on me and i know how bulletproof nissan engines are considering i have a sr20det in my 240sx and i love it. Im not looking for insane HP (1300!) Im looking for 600-700 streetable HP (pump gas), i have no problem at all building a built motor before i stick it in the car. The only thing holding me back from the RB26 is that i'm in love with prochargers and darius's procharged LT1 haha. Quote Link to comment Share on other sites More sharing options...
Guest Your Car is Slow Posted May 7, 2003 Share Posted May 7, 2003 Is cost a factor? Itll cost you alot more to get an LS1 to that kinda power range than it will an LT1. Quote Link to comment Share on other sites More sharing options...
Mudge Posted May 7, 2003 Share Posted May 7, 2003 No lie, LS1s are nice but they are GENIII goodies and are too new for me to play with, buy in is too expensivo. LT1 is a GENII SBC so parts are readily available at reasonable costs since they follow old school design. Quote Link to comment Share on other sites More sharing options...
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