pwebb Posted April 28, 2007 Report Share Posted April 28, 2007 lpt glt's had 9.5:1?hpt = 8.5?and n/a = 10.5?numbers please! Link to comment Share on other sites More sharing options...
Johann Posted April 28, 2007 Report Share Posted April 28, 2007 LPT's 9:1HPT's 8.5:1NA's 10.5:1 or 10.3:1 depending on EMS used. Link to comment Share on other sites More sharing options...
Zaitz Posted April 29, 2007 Report Share Posted April 29, 2007 Is it save to bump up compression if you are building an engine for higher boost, say to a LPT's compression? Link to comment Share on other sites More sharing options...
pwebb Posted April 29, 2007 Author Report Share Posted April 29, 2007 n/a pistons + HPT block = ??? Link to comment Share on other sites More sharing options...
Zaitz Posted April 29, 2007 Report Share Posted April 29, 2007 n/a pistons + HPT block = ???Forged pistons and rods in a HPT block. Link to comment Share on other sites More sharing options...
Che'_Moderator Posted April 29, 2007 Report Share Posted April 29, 2007 Forged pistons and rods in a HPT block.I'm running close to 10:1 in the S60. I am the odd man out there though. MOst like to be able to run supper sloppy tuning down at > 9.1 with huge boost. To answer your questions though its not a simple as swapping NA pistons for turbo ones. You would have to bore the hell out of the block. Then you run into the S60 engine issues. If someone is interested though have a 2.1 L short block with 9.5:1 compression based on a stock head. If you did work on the head it would still be well over 9:1. Link to comment Share on other sites More sharing options...
Zaitz Posted April 29, 2007 Report Share Posted April 29, 2007 I'm running close to 10:1 in the S60. I am the odd man out there though. MOst like to be able to run supper sloppy tuning down at > 9.1 with huge boost. To answer your questions though its not a simple as swapping NA pistons for turbo ones. You would have to bore the hell out of the block. Then you run into the S60 engine issues. If someone is interested though have a 2.1 L short block with 9.5:1 compression based on a stock head. If you did work on the head it would still be well over 9:1.Well I have forged rods coming and I have the forged rods. On a HPT block that is bored to .20 and with cylinder head work, is 9:1 safe on a decent tune? I will going with a super 16g from hahn and a Rica tune with a 19 tune as the base map. After dynoing it, it will be sent back to Rica. Link to comment Share on other sites More sharing options...
Che'_Moderator Posted April 29, 2007 Report Share Posted April 29, 2007 Well I have forged rods coming and I have the forged rods. On a HPT block that is bored to .20 and with cylinder head work, is 9:1 safe on a decent tune? I will going with a super 16g from hahn and a Rica tune with a 19 tune as the base map. After dynoing it, it will be sent back to Rica.9:1 is no problem. I would go higher because its going to drop as you do head work. Start around 9.5 and end up around 9:1. On pump fuel with a good tune and cooling 2 bars would be doable. Link to comment Share on other sites More sharing options...
Zaitz Posted April 29, 2007 Report Share Posted April 29, 2007 9:1 is no problem. I would go higher because its going to drop as you do head work. Start around 9.5 and end up around 9:1. On pump fuel with a good tune and cooling 2 bars would be doable.Well, 2 bars is a long way off for me. I am thinking around 20-22psi should do it. I'll see what happens with the tune and rebuild first. I dont have the cash to upgrade to a manual, so stock trans and a trans cooler is all for now. Thanks for the help. Link to comment Share on other sites More sharing options...
Che'_Moderator Posted April 29, 2007 Report Share Posted April 29, 2007 Well, 2 bars is a long way off for me. I am thinking around 20-22psi should do it. I'll see what happens with the tune and rebuild first. I dont have the cash to upgrade to a manual, so stock trans and a trans cooler is all for now. Thanks for the help.Stock trans will make way more power than the ehgine will so your fine there. Link to comment Share on other sites More sharing options...
Zaitz Posted April 29, 2007 Report Share Posted April 29, 2007 Stock trans will make way more power than the ehgine will so your fine there.Thats what I have been reading on here, hopefully it holds. Having 55k on it doesnt hurt either. Link to comment Share on other sites More sharing options...
uwackme Posted April 29, 2007 Report Share Posted April 29, 2007 Depends on how crazy you wanna get.HPT block, forged custom crank, forged custom rods, forgrged pistons, teflon skirts/ceramic top. Ceramic coat combustion chambers. Aftermarket valves.Have the block milled down 1/4" and have a deck plate welded on providing actual connection between the cylinders and the block at the deck. Machine in holes for water and oil to the head. Machine in provision for a copper Oring headgasket.Then you can run higher compression and high boost. Say 10-1 with 30Lbs of boost. At which point you'll tear the guts out of any transmission you can find, and if you find one to last, you'll twist up the axles :P Link to comment Share on other sites More sharing options...
Boosted5cyl Posted May 1, 2007 Report Share Posted May 1, 2007 Yo Zaitz sweet A$$ ride man, I sweet the yellows to death, 4 or 5 doors ! Link to comment Share on other sites More sharing options...
Zaitz Posted May 1, 2007 Report Share Posted May 1, 2007 Thank you! Still waiting for my pistons though. Link to comment Share on other sites More sharing options...
simon072889 Posted May 8, 2007 Report Share Posted May 8, 2007 has anyone bumped up the compression ratio of an N/A? is it safe to run 11.5 or is it a no clearance set up with the valves, so it cant be machined down. Link to comment Share on other sites More sharing options...
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