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this question is in relation to sr engines equiped with VVL.
Consider 1. the rods are forged and you are shopping for the right forged pistons with respect to compression ratio.
2. You want to ^hp x twice stock hp (over 400..maybe 500 if its possible) by increasing boost or adding N20.
Would it be best to get forged pistons with the same, higher, or lower comp. ratio as stock if the engine is a..
1. VE
2. VE-T
3. VET
I'd especially like to know about the last (VET).
If you're gonna stay NA, then going with higher compression pistons.
If you're gonna boost/forced induction, then you need to lower the compression.
Remember, the VE has a 11:1 compression ratio from the factory so forced induction would be a BIG NO-NO.
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i forget what the compression it is when you put turbo pistons such as the BB and GTIR isnt i little higher than a regular DE. hopefully someone could shine some light on this
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(New all motor) 96 B14: Sr20VE JWT ECU, Msd switches, ES mounts and Bushings,2.25 stomung exhaust, KYB shocks, Eibach Sportlines, NGK Plugs/wires, ACT HDPP & Street disc, Hotshot CAI & Headers gen. 5,N-1 intake mani/TB,thermo spacers, B15 LSD trans, AEB1 GEN. 1 Header...
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this question is in relation to sr engines equiped with VVL.
Consider 1. the rods are forged and you are shopping for the right forged pistons with respect to compression ratio.
2. You want to ^hp x twice stock hp (over 400..maybe 500 if its possible) by increasing boost or adding N20.
Would it be best to get forged pistons with the same, higher, or lower comp. ratio as stock if the engine is a..
1. VE
2. VE-T
3. VET
I'd especially like to know about the last (VET).
Share your thoughts guys!!
I'm far from being an expert in this arena but if your goal is 400-500 HP I don't think there is any way that's going to happen without serious forced induction so I'd just forget about getting higher-comp. pistons for a N/A motor.
People do make those kind of numbers from DE-T motors with 9.5:1 ratios but I would think the ideal would be 8.x:1 the way Bluebird/Avenir/GTI-R motors are made. So if you're going to build a VE-T I would say you need to drop some lower-comp. pistons in. A VET (if you an actually get one) is probably ready to make those HP #'s with its stock bottom end.
i dont think u need special pistons just because its a ve, you just have to realize that because the head has a tighter combustion chamber u will have a little more compression than stated when u order pistons from JE ect
i think if you get some Forged 9:1 pistons, or even 8.5:1 you should be in the range of a regular de, and you should be able to boost without worring about detenation,
i think if you lower the compression the stock VE bottom end will probably make the numbers you want
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I understand that 10.3:1 compression is a lot for forced induction but how many Honda vtec motors are running around that are force inducted? Aren't those high compression also?
yeah no one said u cant run high compression on boost, ive seen stock type r motors being boosted, just that with lower compression u have more room for error, higher compression means that u have to tune your car alot better to and u have a small margin for error. VVL motors arent dime a dosen, so i would suggest lowering the compression even if it means using a thicker headgasket, but i see no problem with 10psi on that compression or even up to 15, if your set up is tuned properly
.........but i see no problem with 10psi on that compression or even up to 15, if your set up is tuned properly
Therein lies the issue.......the "TUNED PROPERLY" part.......the margin for error will be very narrow and slim. And who knows how long the setup will actually last?
good going guys...and gals if any. I see the general idea is to lower the compression.
NOW LET'S TALK SR20VET. JDM X-TRAIL GT. 276hp stock.
This engine is boosted with the cams and valve lift maximised (or is it?) for this output, right? I know there maybe countless threads about this topic but what the heck..this is just another, new ideas might pop up.
are the cams really maximised or is there more tuning potential?
the pistons are 9:1 with valve reliefs. To incorporate the idea in the first thread (more boost + N2O= 500hp), do you think it would be wise to use lower comp. pistons? If so, would it cause any SIGNIFICANT decrease in bottom end power? Please say what comp. pistons you recommend for this (VET) application.
I'll share some info on the sr20vet internals later.
about the sr20vet..if u knew this already this is for someone else who didn't...well as i said, the stock vet pistons are 9:1 compression. The rods although they have different markings (part#s) on them the are the same det rods. this means the det bearings can work in the vet. pin height for the piston is the same as the det too. the head gasket is metal. as for the head..i can't explain how it works, but if you guys need physical info on it i can take a look while its out and shout you back. I have a set of CP 8.5:1 pistons without valve reliefs to replace the stock vet because detonation had the better of them. what are your opinions on this?
The problem with ve pistons are the ring land are to small,not the compression is to high.They are half the size of De's.So bosted VE is a NO NO.I know people with boosted 11.1 and higher running fine.
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i know bigtom has a piston being made for the VE right now. i know its 11.7 compression 87mm and it is very light weight about 325 grams with the piston pin. it uses some sort of special rings for long life at high rpms. it is supposed to be ready at the end of April. i hope he doesnt get upset if i spilled the beans on this but it sounds like a great thing. i saw the prototype on his desk a few weeks ago and it was a beautiful thing. im going to buy the first set available for sure.
__________________ 212.6WHP SR20VE-N1 TB, N1 cams,JWT cam gears,N1 retainers,N1 valve springs,SR16VE M/T ,Nismo radiator(w/cap),AEBS GEN1 HEADER,N1 intake manifold W/TB , cobra maf,3" exhaust w/N1(APEXi) muffler,Greddy MSS for cam switching,Autolight gauges,Tein HA's,Cusco under cariage brace and F/R STB's,N1 sway bar,Momo ,wheel and nob, N15(zenki) lights and grill,and a system that makes my but knumb!
212.6WHP SR20VE-N1 TB, N1 cams,JWT cam gears,N1 retainers,N1 valve springs,SR16VE M/T ,Nismo radiator(w/cap),AEBS GEN1 HEADER,N1 intake manifold W/TB , cobra maf,3" exhaust w/N1(APEXi) muffler,Greddy MSS for cam switching,Autolight gauges,Tein HA's,Cusco under cariage brace and F/R STB's,N1 sway bar,Momo ,wheel and nob, N15(zenki) lights and grill,and a system that makes my but knumb!
