HELP Where can i find a longer timing belt??

[neo240sx]

I need a timing belt for a rb25 thats like 4mm longer idk the unit of measurement (maybe 1 tooth) I'm running a thicker head gasket and the stock wont work.

[240z4u]

Sweet.

[rb25det250sx]

are you serious?

[gawdzilla]

Sweet.

lol let me elaborate on this...
1) you're running a head gasket that is 4mm thicker than stock?! do you understand how thick that is for an HG?
2) 4mm is easily adjusted with the oem tensioner. you are doing something wrong.
3) if you arbitrarily add a tooth somewhere on your belt, your mechanical timing will be thrown off.

Sweet...

[240z4u]

Sweet.

lol let me elaborate on this...
1) you're running a head gasket that is 4mm thicker than stock?! do you understand how thick that is for an HG?
2) 4mm is easily adjusted with the oem tensioner. you are doing something wrong.
3) if you arbitrarily add a tooth somewhere on your belt, your mechanical timing will be thrown off.

Sweet...

This is what I meant.

[neo240sx]

No the head gasket I'm wanting to run is a cometic 3mm. The stock nissan gasket is 1.1mm. The problem is the oem tensioner is maxed out with the 2.1mm apexi HG I'm running. I discussed this with the people in australia and they cleared it up.
I have to run 2 tensioners instead of a tensioner and a idler pulley.

[Darius]

I don't see this ending well either way you do it. Do you want to elaborate on why you are using such a thick head gasket?

[neo240sx]

not really its kinda a long story but same as John in raleigh. I got high comp pistons and gonna run a thick hg to bring the comp down.
My comp with a stock HG is 11.7:1. With a 3mm HG it should be around 9.3:1

[Cjmartz2k]

So you built your motor using the wrong parts and you are trying to make up for it with a retarded thick headgasket.


Sweet.

[rb25det250sx]

oh my. and if you have a apexi hg, why in the world would you switch to cometic?


here is a solution, how about you torque the head studs more to give you that extra space you need.

[Joe]

this whole thread screams idiot.

[RustspecS13]

Start saving your money again, you'll be rebuilding a different rb25 when that one turns to slag. GL

~Alex

[neo240sx]

It was running for a year like this before I knew I was at 11:1 comp. I was running 14lbs of boost but i couldnt run much timming. Lots of other makes do this to drop the comp on there setups. Hondas, Fords, even Nissans I dont see there bring an issue.

[Cjmartz2k]

Running a slightly thicker head gasket to bump your compression down a little is a common practice. Doing it as much as you are talking is not common at all. There are other things that factor in to how resistant to knocking your engine is. When you put a HG on that's 3x as thick as stock, you are F'ing stuff up like quench height which makes you MORE prone to knocking. I'm baffled as to why they even make one that thick--o yeah, never mind. They make it because people evidently buy it

[neo240sx]

There must be a lot of people that buy them because they make large hg's in apexi, cometic, and greddy for pretty much all makes for turboing NA car. There's no engine damage just blown head gaskets. I'll post my results when i get it back together. should be a week or so i gotta get another tensioner.

[neo240sx]

Ok got the Cometic 3mm HG on there and it runs fine with the stock base map on it! I havnt boosted much on it as its only the base map so no WOT but as far as "quench height" or whatever. No problems with knocking yet. So far it runs great with no over heating issues or knocking.

[Joe]

you have no idea how your engine is running unless you have a wideband on it.

running a hg that thick is stupid only for the simple fact you are far more likely to blow it.

[neo240sx]

I have a wideband on it! I'm tuning it with nistune. The AFR's are perfect. My only issue now it getting my ls2 coils to not blow out spark under full boost.

[silviasgp06]

How are you monitoring knock? Just because it "feels" like its running fine and the AFRs are fine doesn't mean your not knocking...

[neo240sx]

Watching egt's and keeping the timing conservative until i put it on a dyno. There is no any audible knock tho

[rb25det250sx]

what are perfect afr's to you? and your tuning it?

I never had to change anything with my coils. i dont know why your having problems....wait. maybe its the stupidly thick HG.

[neo240sx]

what are perfect afr's to you? and your tuning it?

I never had to change anything with my coils. i dont know why your having problems....wait. maybe its the stupidly thick HG.

You are retarded sir! Stock coils are prone to failure. Anyone with a RB motor would agree. LS2 coils produce a much higher spark then even the supersparks or whatever brand. And perfect AFR's are 11.4:1 while under boost according to my egt gauge.

As for the issue with the LS2 coils I got that figured out as well. I'm currently running 14lbs on a T3/T4 60 trim with no issues. When running nistune and these coils the dwell must be significantly increased. The nistune conversion I found was running the coils at 14% charge.

This forum is supposed to be about help on topics or for research. I searched and found nothing about "stupidly thick HG's" so I gave it a shot and am posting my results. The 3mm head gasket works on my rb25 neo so far with no issues under boost. I'll try to make it to a local dyno for some tuning time but until then if you wanna hate and are in the charlotte area, come get some!

[rb25det250sx]

your the retarded one man... there are alot of very well known people on this post telling you that your doing something very stupid! there might not be anything going on right now that you can monitour but that dont mean you wont have later side affects.

And i have dont the wasted spark set-up so i have ls-2 coil packs. tuned on the haltech and i've never had to mess with dwell. on 28psi Gt-K 850.

[neo240sx]

Nobody posted about wasted spark, and every standalone uses a different method to control the coils. pfc uses degrees, nistune uses ms & %, ect. It might be that nistune sucks but as far as the usual methods of monitoring my performance I'm in the clear. I will post dyno sheets and events even if it explodes!
Posting facts is what the forum was made for.

[RustspecS13]

Sweet bro, good luck with long term detonation.

~Alex

[neo240sx]

You guys are so unhelpful

How you even mention long term when you got that fail written in your signature.
'91 s13 hatch VQ35 swap of some sort- the long term build

My FAIL GAAAAAAAUGE

[RustspecS13]

As far as my signature goes, don't be jealous I have more then one project. A mild failure happened on the RB, and its going back together, but I have bigger and better plans for the future, involving all of nissan's engines. And I plan on blowing up a lot of them to see where real limits are, not yo bro i made 800whp with a 3mm hg, yo guys have no idea wut ur talkin bout!!

Your fail gauge reads wrong because you don't know how to read it.

You are retarded sir! Stock coils are prone to failure. Anyone with a RB motor would agree. LS2 coils produce a much higher spark then even the supersparks or whatever brand. And perfect AFR's are 11.4:1 while under boost according to my egt gauge.

Good thing we already know about LSx coils. And "perfect" afrs vary from setup to setup, so keep that in mind. Cj has run lots of boost/HP through stock coils. That was in japan where its easier to get replacements, but here we can get them from q45's as well. How ever, more spark is always better.

This forum is supposed to be about help on topics or for research. I searched and found nothing about "stupidly thick HG's" so I gave it a shot and am posting my results. The 3mm head gasket works on my rb25 neo so far with no issues under boost. I'll try to make it to a local dyno for some tuning time but until then if you wanna hate and are in the charlotte area, come get some!

You have to actually put forth effort to find good info. Trying varying versions of what you want to find helps, and doing research off the forums. I suggest looking at detonation and why it happens, and "quench" in the combustion chambers and how it helps prevent it.

MAYBE, just MAYBE, you happened to throw together an engine that has "acceptable" quench. Builds like yours I call "a balance of garbage" where you have just enough stuff thrown together where it works "OK". But it will never have out standing results.

And don't worry about my VQ- It'll probably make way more power then your RB25 ever could, and do it cheaper and more reliable then what you have. But thats what happens when you do research and learn for your self. And maybe one day soon I will stop by and take you up on your challenge. At the track, any of your choosing.

~Alex

[neo240sx]

I dont understand why people always wanna stay nissan when swaping an engine. I started a lq4 swap into a s13 in August. That motor was only 800 shipped. With the ms3 cam I got for it, it should make right at 400 to the wheels. Add a 150 shot and done.
People get so hung up on nissan motors when there are much better motors to be had. By the time you get your VQ35 swap done I'll be in the 10's easy.
Just save you money and go V8.

[rb25det250sx]

its the love for the motor. your not a real nissan enthusiast saying s*** like that... if he or anyone else wanted a v8 they wouldnt be on this board. but they all went RB for a reason. you think honestly you'll be in the tens with that piece of yours when you came on here and said you needed a longer timing belt? im pretty sure my little newphew knows you cant do that.

[neo240sx]

First of all there's no denying that the LSX motors are probably the best NA motors ever made.
Secondly, I'm in the persuit of fast. Not all nissan or bust one in my a** gayness.
If I had found a flawless fd, miata, S14, ect for $700 then i probably would be swaping that instead.
Third of all a good friend of mine who is a "very repected" member of forum (9000 post) told me it could and had been done. So i figured i would ask.
It just so happens that nobody here could answer the question that the people from skylines australia knew right away.
So tell your nephew to check skylines australia next time he has a question about rb's.
Here I'll even give him a link!
http://www.skylinesaustralia.com/forums/forums.html