Turbo Exhaust Manifold For L Series

[luke_mcmahon85]

Hi guys, i was wondering if anyone had a spare turbo exhaust manifold from an l20et lying around...or even a whole setup. This is for a L28et build in a 260z. Also, is anyone on this forum familiar with/used megasquirt EFI ECU? The Z guys in the US rave about it, it's a do-it-yourself type deal thats supposed to be fantastic, but i think it's only available from the US. Any experience?

Thanks guys....and sorry i don't have a skyline...maybe in the future!

[Ghostrider]

Hi guys, i was wondering if anyone had a spare turbo exhaust manifold from an l20et lying around...or even a whole setup. This is for a L28et build in a 260z. Also, is anyone on this forum familiar with/used megasquirt EFI ECU? The Z guys in the US rave about it, it's a do-it-yourself type deal thats supposed to be fantastic, but i think it's only available from the US. Any experience?

Thanks guys....and sorry i don't have a skyline...maybe in the future!

It's not only the exhaust manifold you want, but the inlet as well and I guess they're getting a bit like rockin horse sh!t these days.

Best you search the importers, coz my spares don't go round all that want them, so I guess I should keep em to myself.

The longer runners of the turbo inlet manifold will make a whole load of difference, and maybe you should ask the guys on Hybrid Z in US, the freight can't be that bad to get a manifold here and if it's what you want and cant get it here, then money should not be the problem.

Cheers, D

[Blue Dynamite]

It's not only the exhaust manifold you want, but the inlet as well and I guess they're getting a bit like rockin horse sh!t these days.

Best you search the importers, coz my spares don't go round all that want them, so I guess I should keep em to myself.

The longer runners of the turbo inlet manifold will make a whole load of difference, and maybe you should ask the guys on Hybrid Z in US, the freight can't be that bad to get a manifold here and if it's what you want and cant get it here, then money should not be the problem.

Cheers, D

Longer runners?

I have some L28 turbo manifolds along with the inlet manifolds to suit but they're already promised to a friend. I compared the inlet manifolds with those off an MR30 and they're almost identical. I'm pretty sure either will do for a turbo job although I might be wrong.

I heard the L28 turbo manifolds I have are good up to about 350-400 horsepower, they're pretty large. I've heard that few turbo 280zx's were brought into Australia so perhaps getting someone to make some turbo manifolds is a better option.

Here is a link to ozdat where a guy turbo'd his 240z: http://ozdat.com/forum/viewtopic.php?t=6303

Rick

[works 510]

Longer runners?

I have some L28 turbo manifolds along with the inlet manifolds to suit but they're already promised to a friend. I compared the inlet manifolds with those off an MR30 and they're almost identical. I'm pretty sure either will do for a turbo job although I might be wrong.

I heard the L28 turbo manifolds I have are good up to about 350-400 horsepower, they're pretty large. I've heard that few turbo 280zx's were brought into Australia so perhaps getting someone to make some turbo manifolds is a better option.

Here is a link to ozdat where a guy turbo'd his 240z: http://ozdat.com/forum/viewtopic.php?t=6303

Rick

Yeah dave "thehelix" is only using a NA inlet manifold.

Also, is anyone on this forum familiar with/used megasquirt EFI ECU? The Z guys in the US rave about it, it's a do-it-yourself type deal thats supposed to be fantastic, but i think it's only a

I know of a couple people with MS installed to their cars. One being a rb30e+t r31 (contact juls on the r31skylineclub, he also has a efi'd 808 mazda with MS ) and thomas(ozdat forums) who has a l20b efi'd with MS and now turboing it.....They say nothing but good words about the megasquirt ecu.

[Ghostrider]

Longer runners?

I have some L28 turbo manifolds along with the inlet manifolds to suit but they're already promised to a friend. I compared the inlet manifolds with those off an MR30 and they're almost identical. I'm pretty sure either will do for a turbo job although I might be wrong.

I heard the L28 turbo manifolds I have are good up to about 350-400 horsepower, they're pretty large. I've heard that few turbo 280zx's were brought into Australia so perhaps getting someone to make some turbo manifolds is a better option.

Here is a link to ozdat where a guy turbo'd his 240z: http://ozdat.com/forum/viewtopic.php?t=6303

Rick

Rick,

It's my opinion that s/s exhaust manifolds eventually crack and then in the worst possible place, which usually means R & R to fix it.

Not many people will tell you their s/s manifolds are bad, but it's a fact, they break.

The best turbo exhaust manifolds are cast and hence why stock L28ET/L20ET manifolds are so hard to get nowadays.

And most custom made s/s manifolds are high mount and that's more for show than go. The manufacturers make the factory manifolds low mount for a reason and it's not to hide the compressor from the law. It has a whole lot to do with heat dispersion and keeping the engine bay as cool as possible.

As for the longer runners, the 2 x turbo inlet manifolds I have here are about 1 inch longer than the stock n/a L24E inlet and the plenum is larger.

Cheers, Dennis

[luke_mcmahon85]

yeah, i've been told that the difference between turbo and na inlet manifolds is negligible... neither is particularly great for flow, but if it's boosted it's less of a problem than for NA anyway...

we didn't get the turbo 280zx...which sucks, and everyone i've inquired about in the US quotes ridiculous shipping charges...

i might try new zealand...they have more l20et's right? shipping shouldn't be too bad...might even be able to get an LD28 crank while i'm at it and built my L28 out to 3.1 litres...and turbo to boot!

another idea for the inlet manifold i've been thinking about is this set up

http://www.atlanticz.ca/zclub/techtips/int...take/intmnt.jpg

it's a EFI intake, cut at the start of the runner, to preserve the injector mounts, then welded to the larger twin SU manifold, with dual throttle bodies where the carbs were.... of course you have to port the EFI flange to match up with the carb manifold.....what do you guys think?

by the way, thanks for all the quick responses guys!

[Mr Camouflage]

www.hybridz.org is probably the best place to learn about L series 6 cylinder turbo engines.

I hear the non egr N42 intake manifold is a good one to use for turbos. I dont know why though. It's not a turbo manifold to begin with.

As for shipping from the usa, tell them to ship it surface mail, and it should cost about half what they tell you for priority mail. It will take a couple of months to get here though.

And yeah NZ had alot of L20ET's so thats a good place to find turbo exhaust manifolds. check www.trademe.co.nz for them. I had a friend get a whole L20et, and he's stripping all the bits i want off it and sending them to me.

Also get a turbo oil pump.

[stagefumer11]

www.hybridz.org is probably the best place to learn about L series 6 cylinder turbo engines.

I hear the non egr N42 intake manifold is a good one to use for turbos. I dont know why though. It's not a turbo manifold to begin with.

As for shipping from the usa, tell them to ship it surface mail, and it should cost about half what they tell you for priority mail. It will take a couple of months to get here though.

And yeah NZ had alot of L20ET's so thats a good place to find turbo exhaust manifolds. check www.trademe.co.nz for them. I had a friend get a whole L20et, and he's stripping all the bits i want off it and sending them to me.

Also get a turbo oil pump.

The fact is they recomend the n42 non EGR manifold because of the less hassel it requires to mod, Port ect.

I do no recomend using a l20et intake manifold. They do use quite long small runners, great for huge amount of torque and instant throttle response. Anything over 5000rpm, and its a brick wall, you max out the flow of the intake runners. Remember smaller is more torque, but no top end.

Stick with the factory l28e intake manifold, They use sligtly larger and shorter runners, so top end isnt a problem. If you can find one a NAPS intake manifold (nissan Anti polution system) would be the best to grab as it uses the same size runners as a factory l28et intake manifold. Just a little junky.

I have a l20et intake manifold avalible if needed. But im unsure on shipping, i dont recomend them. The exhasut manifold is the same as a l28et either way, And correct good for over 400hp,

Ill tell you how i get on with my l28et im doing in the garrage as we speak. God i hate drilling the block.

[stagefumer11]

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Edited October 1, 2006 by stagefumer11

[discopotato03]

There are other options for the inlet side but depends how much fabrication your prepared to do .

I'm personally not a big fan of the twin throttle body on SU manifold idea , the cast in balance pipe does not do kind things to flow and reversion problems arise if you use healthy cam profiles .

I did have some experience with the factory L18 EFI manifold on an L20B that had been bored and stroked to 2340cc with interesting results . When the tiny (for emissions) L18 throttle body (TB) was fitted all was Ok , when a larger FJ20 TB was fitted it did not go much better . I think the problem was that the manifolds plenum chamber volume was designed to cope with 1800 odd cc not 2340cc and there was too much pressure drop in it from the larger cylinders drawing from it . I did have plans to cut and shut the largest plenum volume L6 manifold I could find but an FJ20ET got in the way first .

I think the go is to use the largest factory plenum L6 manifold you can find on the L28 (or larger) L6's or they would suffer the same problems .

For the Nth degree in zero loss throttling you'd have to look at multi (6) throttle inlet system which you can do with dual TB's x 3 but its not going to look real standard . Otherwise I suppose you may be able to do something with GTiR or GTR TB's but the L series 6 is wider between the middle two inlet ports from memory so not very easy .

Exhaust manifolds can be fabricated but room is limited on an inline six , pitty the after marked didn't do a decent cast exhaust manifor as far as I'm aware . Probably better just to use the L20ET or L28ET manifold and try and spec a really good turbo for it . While I'm at it for those that may not know Garrett is finally selling genuine GT30 and GT35 exhaust housings with integral waste gates so GT30/35 series turbos just got easier - don't need the complicated external gate .

Dennis has probably put more research into this stuff than anyone else I know of .

Cheers A .

[Ghostrider]

i might try new zealand...they have more l20et's right? shipping shouldn't be too bad...might even be able to get an LD28 crank while i'm at it and built my L28 out to 3.1 litres...and turbo to boot!

another idea for the inlet manifold i've been thinking about is this set up

http://www.atlanticz.ca/zclub/techtips/int...take/intmnt.jpg

it's a EFI intake, cut at the start of the runner, to preserve the injector mounts, then welded to the larger twin SU manifold, with dual throttle bodies where the carbs were.... of course you have to port the EFI flange to match up with the carb manifold.....what do you guys think?

by the way, thanks for all the quick responses guys!

Keep dreamin about that Ld28 crank from NZ, coz it aint going to happen as you think.

You can buy an LD28 crank in NZ for the equivalent of AU$150.00, but that's where CHEAP starts & ends.

NZ Post offices refuse to accept anything over 20kg and the LD28 crank bare weighes 22kg, packed about 23kg, so they tell you to send it airfrieght.

Ring DHL and you will get a price of about AU$600+ and the freight alone cost is as a minimum 1 Cu Me and about AU$300 plus agents fees, plus duty, plus airport fees, plus, plus, plus.

I did this exercise 3 times and the best price I could do landed was just under $900.00 and for that money you can get them here.

Do some homework before jumping in head first, as the US site that talks about the L31 starts off by saying "IT IS NOT CHEAP"

The LD28 crank needs to be re worked before it can go into an L28 block, so your $900 has just started on another dollar climb.

Go talk to a guy that doesn't talk to me "Steve Lamb" in Melbourne, I think SLamb is his handle and he will tell you ANY L28 built right will rev harder and go quicker than any L31 and at a lot less dollars.

As for the manifold, WHY????????? why use carburettors when you have EFI?

Doesn't make any sense to me.

Cheers, D

[Ghostrider]

Ghostrider said:

As for the manifold, WHY????????? why use carburettors when you have EFI?

Doesn't make any sense to me.

Cheers, D

Sorry Guys! never read it properly again.

Twin Throttle Bodies ???????????

Still don't know why?

THe Japanese, for economy used a dual stage throttle body (TB) on their L28ET's, pics attached.

This TB never ventured anywhere other than Japan unless on an imported engine (just like this in my garage)

Most of the Zed guys use a 65mm TB off the KA24E or RB25DE engines and with the right gear, 400rwhp can be acheived relatively easily, so before we go much further with this discussion, Can someone please explain how they intend getting more than this figure to the ground, on anything street legal, on a car weighing under 1300kg

I have 245/45 x 16 tyres and I cant get more than 330 to the ground successfully.

Cheers, D

[Ghostrider]

Also get a turbo oil pump.

Remember when getting this, that their is 3 of them. The L20ET version is the smallest of the 3 and if your in Oz, get in touch with SWR, Stewart Wilkins Motorsport at Mulgrave (02) 4577 2400

He can supply you a high volume pump brand new, for less than you will get one ex USA 2nd hand. About $185.00 I think I paid for mine, and it's as big as Nissan's biggest.

Cheers, D