The V8 Owners Forum -

The Skyline is coming along nicely now, so it's about time I thought about the engine. I've bought a 1991 LS400 with the 4.0 1UZFE engine.

I plan to use the stock ECU, engine, ignition, everything etc for the time being due to costs. I want this one running asap!

I could just bolt the engine in as is and have a nice 260bhp.

I've bought a decent fuel system (fuel cell, twin pumps/filters, swirl pot, Aeromotive FPR, AN6 throughout) so that will take pretty much whatever I need for the time being ... but it's enough to support a few more ponies.

The factory ECUs will support 6-7psi of boost without modification, it's been done loads of times. So, I have two options, supercharge or single turbo.

Supercharger would be an M112 from a Jag or Rangey, including the chargecoolers. This will required a modified inlet plenum to take the chargecooler runners, not a massive job really but something I can't do myself. Might require a modified pulley, but probably not.

Turbo would be a holset HX35/40 or equivalent, and I was thinking a 50-60mm external wastegate. I can turn the exhausts manifolds round, and knock up a turbo manifold similar in design to a TVR V8 in front of the engine. I already have an intercooler that will work.

So, what do you guys think would work best? I'm not sure how the turbo/wastegate will work at such low boosts ..?

Hi
can I suggest getting it up and running normally aspirated, debug the car and get it reliable then add a supercharger once you are happy it is sorted.
best regards
Mike

kiwicar wrote:Hi
can I suggest getting it up and running normally aspirated, debug the car and get it reliable then add a supercharger once you are happy it is sorted.
best regards
Mike

Exactly what I was about to say.

kiwicar wrote:Hi
can I suggest getting it up and running normally aspirated, debug the car and get it reliable then add a supercharger once you are happy it is sorted.
best regards
Mike

That's what the plan is. No harm in planning for near-future mods tho eh?!

I've practically bought everything I need for the car now bar gearbox conversion, front calipers and some wiring bits, so will have some funds spare shortly.

I'm edging towards a turbo. Tial wastegates are decent and can come with a 6psi spring. Holset hx35s are a couple of hundred quid.

Hi
I have some lexus 400 calipers somewhere if you want them . . gratis.
Mike

Ive got a whole lexus ls400 in the back yard ... I'm going for brembo 6 pots on the front, already got the conversion parts

How about a centrifugal blower? I believe those are particularly well suited to N/A conversions?

Mike, what kind of brakes are they? 2 pot/4 pot? I might buy them from you.

Id say Turbo. Go for an eBay GT35 or GT45. According to the turbo forums these Chinese chargers are deffo worth the money and costs grabs. Theres lots of testing experience over there on the turbo forums.

http://www.theturboforums.com/forum.php ... 07ac34948d

No loss of supercharger drive.
No intake fab needed.
No drive fab needed.
Just some piping and welding a flange that holts the turbo and welding a flange for the wastegate........psssht psssht there you go.

7psi created by a turbo has more bhp than 7psi created by a supercharger.

Turbocharge it.

It is by far the easiest to DIY and with the most room to grow in the future.

Boost isnt an issue as long as the turbo itself and w/g can accommodate it.

You could run 1psi if you really wanted to ( and actually find a w/g spring that soft lol )

cammmy wrote:How about a centrifugal blower? I believe those are particularly well suited to N/A conversions?

Mike, what kind of brakes are they? 2 pot/4 pot? I might buy them from you.

2 pot sliding caliper, need a clean!
Best regards
Mike

This sounds interesting Olly!

I've decided on a Holset turbo, probably a HX40 to HX55 depending on exhaust turbine. External wastegate, and that's it. Maybe try an Apexi SAFC to help with fuellign on the factory ECU. But all that is for later next year at the earliest!