Thread: VE-T people, what pistons?

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2012-09-12 04:16:29

#21

ashtonsser Online/offline status of ashtonsser is unknown

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Never, he probably has too much p2w clearance. Mine are not noisy at all, cold or warm.

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1992 Nissan Sentra SE-R - Fully Built SR20VE, BWS400SX Billet 67mm and much more
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2012-09-12 14:37:14

#22

Vadim

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Originally Posted by SR20GTi-R

Originally Posted by Vadim
Stock pistons on VE head is 10.3:1 CR, this is rather high! But VE's are superb at detonation resistance too. I ran 15 psi and it seemed to not detonate, this is pushing it though. Other option is stronger DET pistons, that will lower the compression to a pretty good 9.3:1. You can also get VET pistons, that will lower it below 9 afaik. Honestly I wouldn't go below 9.3 unless you want to run 20+ psi.

Another thing to keep in mind, VE has oil piston coolers, that means you have to use pistons that are notched for that (VE, DET, VET).

10.3:1 is not high by any means.

Going with a DET piston will limit RPM with the lack of valve notches.

Cant say "15psi" is pushing it as 15psi from a T25 is more stressfull to a factory VE than 15psi on say a GT35R.

To the OP, if you list what your setup will consists of, only then can someone tell you what is safe to run for a piston/turbo etc.

On a VE 10.3 feels like 9.5 (amount of timing wise), but if you try to run a 10.1 DE with the same amount of boost your really going to be knock limited. Yes tuning can let you run just about any compression, but after a certain PSI you just run out of timing you can retard to prevent detonation, but that is also manifold/turbo/cam dependent too.

Without knowing turbo/manifold that would be used I would not suggest anyone over 15psi on stock pistons/comp. Since I know he is gonna run an EQ length with T3, he should be fine even above that psi on stock pistons with the right tune.

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2012-09-12 19:32:58

#23

rellis

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So do I need the 'VE harness also? What powers the solenoids?

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2012-09-12 20:11:03

#24

cortrim1

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Originally Posted by rellis

So do I need the 'VE harness also? What powers the solenoids?

No you do not need a ve harness. the solenoids are two wires(power and ground). They are wired 12 volt constant from the factory with switched ground to cut them on. Most people just use some spare connectors to make a harness for the vvl solenoids.

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Mike
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2012-09-12 20:20:18

#25

SE-Rican

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People trip me out.

High compression boost is the way to go! With the tuning options available these days I would not go any other way.

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SR20Deep
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2012-09-12 20:37:00

#26

SE-Rawkus

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Originally Posted by SE-Rican

People trip me out.

High compression boost is the way to go! With the tuning options available these days I would not go any other way.

Then why are you going low compression boost?

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2012-09-12 21:11:23

#27

SE-Rican

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Originally Posted by SE-Rawkus

Originally Posted by SE-Rican
People trip me out.

High compression boost is the way to go! With the tuning options available these days I would not go any other way.

Then why are you going low compression boost?

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SR20Deep
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2012-09-12 23:00:27

#28

rellis

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thanks everyone you've helped alot, i found an engine now i just need to find some money, figure out what happened to my motor and get going on the car. high compression boost here we go!!

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2012-09-13 02:55:21

#29

Vadim

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Originally Posted by rellis

So do I need the 'VE harness also? What powers the solenoids?

VE harness doesn't activate the cams, VE ECU does.

Two things you can do:
1. Get a window rpm switch, (MSD or similar)
2. Get tunable ECU that has the ability to switch cams on (NEMU or standalone). I'm using my NEMU to activate cams, it's nice not to have to spend the extra $100 on a RPM switch and have far more granular tunability of cam activations.

Originally Posted by SE-Rican

People trip me out.

High compression boost is the way to go! With the tuning options available these days I would not go any other way.

You still can run out of timing to retard, then you start setting back the base timing to below 15....

There is some piece of mind with 8.5:1 DET on my Sentra. I know that if I get bad gas it should survive it.

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2012-09-13 15:21:25

#30

SR20GTi-R

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Originally Posted by Vadim

Originally Posted by rellis
So do I need the 'VE harness also? What powers the solenoids?

VE harness doesn't activate the cams, VE ECU does.

Two things you can do:
1. Get a window rpm switch, (MSD or similar)
2. Get tunable ECU that has the ability to switch cams on (NEMU or standalone). I'm using my NEMU to activate cams, it's nice not to have to spend the extra $100 on a RPM switch and have far more granular tunability of cam activations.

Originally Posted by SE-Rican
People trip me out.

High compression boost is the way to go! With the tuning options available these days I would not go any other way.

You still can run out of timing to retard, then you start setting back the base timing to below 15....

There is some piece of mind with 8.5:1 DET on my Sentra. I know that if I get bad gas it should survive it.

On a tunable ECU base timing means nothing. All it is doing is syncing the Dizzy/Ecu with mechanical timing.

I can run a 20 degree base and it will be no different than a 10 degree base.

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Tired..of the bullshit.

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