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Piglet's Rebuild Of His Busted Tomei 2.8

Piggaz
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Piggaz
Piggaz

Car is finally booked into Insight on the 19th of April for the ECU, fuel system and sensor wire in plus the tune. Thats the good news. The bad news is that V-cam aint gonna fit with my pistons and ho

Piggaz
Piggaz

Small update.... ITS RUNNING. Fired first go! Smells like burnt dust apparently .

Piggaz
Piggaz

A 9174 would just make the EGP pressure issue worse and in my mind it seems like a bit of a GT RS shit going on. Not that it's horrendously bad (It wouldn't be no twin buttplug pressures), That's NOT

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R32 TT Mentor

R32 TT

Posted
Posted

LOL. You're a jerk!

You deserve a chin shot for that!

Got your brakes yet farken?

Haha! Aaaw.. Now don't be like that.

Mmm... Brakes.. Nah they'll be a couple of weeks away yet apparently.

No rush seeing as mine is "Parked" like Yours anyway...!

Piggaz Grand Master

Piggaz

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Haha! Aaaw.. Now don't be like that.

Mmm... Brakes.. Nah they'll be a couple of weeks away yet apparently.

No rush seeing as mine is "Parked" like Yours anyway...!

Still sitting in the corner thinking about what it's done?

Have sticky beak!

Piggaz Grand Master

Piggaz

Posted
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Here is an interesting little comparison.

On the left we have a Tomei procam which was in my old head. The profile was 270 @ 10.25mm. On the left we have a JUN 264 @ 10.5mm. The shape is quite a bit different.

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elrodeo666 Mentor

elrodeo666

Posted
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.... I don't know if that coating is going to last Paul. I mean look at it...

But ah... I don't want to burst your bubble or anything...

GOLD !!

Jun looks more rounded and not as peaky, keeps the valve open longer

Tomei is perky and the Jun is nice and full (using the analogy of Edgar Brits)

Marko that last line of yours sound more like spruiking at a Japanese whore house !!

r32-25t Grand Master

r32-25t

Posted
Posted

Jun looks more rounded and not as peaky, keeps the valve open longer

Tomei is perky and the Jun is nice and full (using the analogy of Edgar Brits)

Except the tomei is the one on the left and is the one that more rounded due to more duration
Piggaz Grand Master

Piggaz

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Except the tomei is the one on the left and is the one that more rounded due to more duration

You would think that. I had a 260 @ 9.15 poncam there too and it looked the same at the 270 (As in the big fat round nose) . Should have put that in the photo too. I'll do that when i'm out there next. Very interesting.

What I did notice just by running your finger over the lobe, the JUN has a 'bump' where the 'start of duration' starts. ALOT more pronounced than the procam. It obviously ramps open alot faster/harder than the tomei.

R32 TT Mentor

R32 TT

Posted
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Dammit I just re read my post. The JUN is on the right. What a bloody noob!

Well mate I demand a back to back comparison. That's the only way to be sure. Plus you'll be doing the GTR community a great service - which I know will make you warm and fuzzy.

Tomei first? :)

Piggaz Grand Master

Piggaz

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Well mate I demand a back to back comparison. That's the only way to be sure. Plus you'll be doing the GTR community a great service - which I know will make you warm and fuzzy.

Tomei first? :)

haha. There will be a back to back. "that" project is humming along quite nicely ;).

The Tomei's are Ratshit. I spose thats what happens when they weld themselves to the cam caps. They can't be reused and will be cut up at some point for 'the project'.

GTR_JOEY Grand Master

GTR_JOEY

Posted
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Haha! Aaaw.. Now don't be like that.

Mmm... Brakes.. Nah they'll be a couple of weeks away yet apparently.

No rush seeing as mine is "Parked" like Yours anyway...!

Got forbid all three of our cars were to be on the road at once lol

R32 TT Mentor

R32 TT

Posted
Posted

No doubt it's something to do with the balance of nature... Law of the jungle.. To prevent the earth spinning backwards if all 3 of us launch in 3rd at the same time...

... Or, I just keep breaking shit.

It's one of those two I reckon... : P

Piggaz Grand Master

Piggaz

Posted
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I was out there again today watching a mates SR getting tuned. I pulled out the cams to compare to the "260 @ 9.15's" to the rest from the other night.

Again from the left are the Tomei 270 @ 10.25, middle is JUN 264 @ 10.5 and right is Tomei 260 @ 9.15.

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The JUN's are definately more "triangle" than the Tomei's in both "Procam or Poncam". Yavuz is going to map the lift VS duration and lay it out on a piece of paper. I'd like to do a set of standard cams just for shits and giggles. I'm sure I have a set laying around somewhere.

R32 TT Mentor

R32 TT

Posted
Posted

So I would have thought that the Tomei profile would be preferred at first glance.

I know there is a lot more to it, but with the Tomei being more 'square' than than the JUN 'triangle' it's going to have more area under the curve. So the valve must accelerate faster on the opening and be 'more open' for longer, no?

In theory if you could open the valve almost instantly and keep it fully open for its given duration then that would be ideal, the Tomei looks closer to this.

Piggaz Grand Master

Piggaz

Posted
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So I would have thought that the Tomei profile would be preferred at first glance.

I know there is a lot more to it, but with the Tomei being more 'square' than than the JUN 'triangle' it's going to have more area under the curve. So the valve must accelerate faster on the opening and be 'more open' for longer, no?

In theory if you could open the valve almost instantly and keep it fully open for its given duration then that would be ideal, the Tomei looks closer to this.

I had the same assumption. I asked Yavuz about this and he waffle quite technical. As I said, he is going to measure the profile and have it on a piece of paper so we can see it on a graph. He was saying the more 'triangular or pointy' it is the better.... But also the harder it is on valve train. Pfft. Harder.

If the 'sponge bob' cams are anything to go by, they will be ALOT more aggressive than this. ;)

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