stevecorrado88

Setup
S13 sr
Gt3071r 21 psi top mount
Tial external wastegate
Stock bottom
Poncams
Rocker arm stopper
Power fc
740cc injectors
Isis intake mani
Q45 tb

I think that's it so my car never breaks on the street no matter how much I beat on it, last 2 dfaction events I lost a shim and most recent broke a rocker arm. I hit rev limit a lot but that's only set to 7000. My question is should I put bc spring or stick with oem internals? My plan is jut to replace the shims and rocker arm but not sure if it's going to keep happening due to weak springs. Any advice would be great.

jr_ss

You should put better springs in it... Tomei or JWT are the best.

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VVL S14 in the works...

stevecorrado88

Even if I'm not reving it past stock??

ray666

check your lifter and make sure its okay

jr_ss

You're hitting your rev limit regardless, you tossed a rocker arm because you hit your rev limit. Stiffer springs well help prevent that even if you only rev to 7k. Another thing that would help, make sure your clearances are right. There is a spec for rocker shims.

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VVL S14 in the works...

stevecorrado88

I was thinking about buying new shims who knows how old they are also read that's it's a big pain to measure clearance of shims, you can't just use a normal gauge.

hOngsterr

Tomei 13220R300 Rocker Arm Stoppers (RAS) SR20DET

done done.

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cotbu

Rocker arm stoppers don't prevent: lost shim/guides or broken rocker arms!
You should bleed the lifters, even if you don't get new springs.
I would also remeasure the shims, but only if there was ever the possibility they got mixed up.

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stevecorrado88

I already have ras I wrote that above. That's probably y I broke my rocker arm in half.

TheRealSy90

Get rid of the rocker arm stoppers. They cause more harm than good. If the motor wants to throw a rocker and the stoppers are holding it down, shit is going to break. I have been running jwt s4 cams for over a year and beat the shit out of my 7500 rev limit on stock valvetrain. I have never thrown a rocker.

What you should do is, throw the stoppers in the trash. Buy another set of the rocker arm guides, the "slotted shims". Have the rockers machined on the outer edge of the arm that was normally on the flat shim as shown in the picture, so that you can run the guides on both arms. After doing this run on the limiter for days. Everything is explained very well in this thread. http://www.sr20-forum.com/all-motor/...arm-shims.html It is a proven method that the fwd guys have been using for years. I never understood why rwd sr owners run rocker arm stoppers, fwd owners figured out how to fix it a long time ago.

http://www.sr20-forum.com/all-motor/...arm-shims.html

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stevecorrado88

Thank you, I have read something about this before but I will do this.

stevecorrado88

Well I read everything and believe I understand it all but when it comes to measuring the clearance can u use a normal feeler gauge?? I'm confident enough that I want to do the double guide for the rocker arms but I don't have much experience in guide clearance. I no that the slotted shims are the same size and the other shim is where the difference would be.

steve shadows

There are a few things that I would do. First of all take the chance to upgrade your cams to better cams like HKS 264 step 2 or Tomei ProCams and get better valve springs. Then you should also get your hands on a shim tool and re-shim your valve shims that the rocker arms sit on. There are a few threads on how to re-shim your head. This will make a huge difference in making the rocker arms vibrate less and run smoother without the higher chance of flying off when hitting a hard cut rev limiter.

RAS will actually be more liketly to break the rocker arms than to prevent them from flying off. I mean they do stop them from flying off but in many cases they break instead. I suggest using the RAS but you need to do the Re-Shim and then also you need to have some sort of rev-limit control. I suggest upgrading to an EMS system that allows you to adjust the spot where your rev limiter is. A great and affordable way to go is to go with a power fc L-jetro. This should help a lot. Thanks and good luck!

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fliprayzin240sx

2 words: Solid Lifters

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jr_ss

I'm going to one up you with two better words, SR20VE head...

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VVL S14 in the works...

stevecorrado88

I'm going to check my shims and if they are good then next step would be springs and retainers.

Croustibat

How about just NOT bouncing off the rev limiter ? Simplest fix ever. And it is free.

TheRealSy90

How about bouncing off the rev limiter more. That's what I do.

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jr_ss

Sure that sounds simple and all, but when you're staging, once boost kicks in, rev limit is almost too easy to hit. I know I've unintentionally bounced off the limit before warming my tires. Even if we aren't talking about drag, if you're sliding, you hit the limiter more. It's there for a reason, however if you have upgraded components, you could safely bump it up to 7500 or so. He could also try a soft cut limiter vs a hard cut limiter.

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VVL S14 in the works...

enohand

I hit 8200 al day everyday, & no problem with rockers being thrown.....
but im FWD & running some Cam gears & BC Stg II

hobbs

uh huh.....

enohand

not sure i understand jake?

jr_ss

What he is saying is your post is useless. It doesn't help the OP and no one cares that you rev your DE/DET to 8200. Not to mention BC cams are garbage.

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VVL S14 in the works...

stevecorrado88

What is soft cut limiter ?? Im only reving to 7000 but I also have 380 hp so it's hitting that pretty hard, I think it's a shim problem because it should be able to handle 7000. I've only have this problem at events and I feel like I've hit rev harder on the street sometimes.

jr_ss

A hard cut is an instant stop to Fuel or Ignition and a soft cut is a progressive or gradual cut.

It very well could be a shim issue, especially if it is happening on the same cyl. I honestly think you should increase your limiter as well.

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VVL S14 in the works...

stevecorrado88

When I went to the dyno I lost power at like 6500 so I won't be making anything plus if I'm floating shims and rockers now it deff won't help at higher rpm on stock springs.

jr_ss

How are you losing power with a 3071R at 6500? Especially at 21psi?

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VVL S14 in the works...

stevecorrado88

I'm only running 256/256 cams

jr_ss

Any particular reason you have that size cam with a large intake manifold, q45 throttle body, and a top mount 3071R?

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VVL S14 in the works...

stevecorrado88

Cams I had so I used them, intake mani is cleaner and easier to work with and water gain it will do for hp, q45 cuz stock tb kept breaking, 3071r because I wanted to see the difference from a 2871r that I had in the same setup in a different car. Is there any reason y I shouldn't have this?? Plus I wanted to prepare for the future if I wanted bigger cams .