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Single turbo VG30DE??


1FASTKINGCAB

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I have a pair of OE T25's OE manifolds and a fresh and STOCK VG30DE with 10:1 compresion for my pickup project. all along I was planing on mounting the OE manifolds upside down, with the turbos reclocked and siting high and up front where nissan mounts the P/S pump and A/C compressor. it would seem as though I can only mount the passenger side manifold on the driver side to get one of the turbos where the A/C compressor would be, which is perfect, but I'm stuck on the pass side.

 

I am thining about making a T-25 -TO- T4 adapter, very similar to the pic I up loaded.

 

and I was thinking I could bring the pass side exhaust under the bell housing and up into my adapter so both banks feed the single turbo.

 

 

Basicly I was wanting to hear some pro's & con's of this setup?

 

My single turbo of choice is a Turbonetics T3/T4 hybrid, with a .63 A/R Stage 3 Turbine and an .60A/R TO4S (60-1) compressor.

 

Here is what I see so far:

 

Pros:

I would save money on one wastegate,

Turbo upgrades will be ALOT less $$$

more HP per dollar

 

Cons:

Twin t25's would have ZERO lag

"Twin Turbo" need i say more?

single turbo/ dual throttle bodies would look wierd

I already have two OEM Garret T25's

T25/28's are pricy to upgrade.

to go with the 60-1 now would require a fuel upgrade ASAP/NOW OEM won't cut it.

 

any input or comments are welcome.

260002_thumb.jpg

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Really you won't see much of a lag difference between twins and a single if both setups are sized properly.

 

There's actually a stock single turbo VG setup, the VG30DET over in Japan. It uses a crossover pipe over the bell housing just like the VG30ET in the Z31 300ZX. Intake manifold is different than the VG's over here but it still has dual throttle bodies, just pointing to one side of the engine.

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Well, If I jubp right into a single turbo I won't play with a samll one I will just get a T3/ 60-1 hybrid and aim for around 550WHP. Mu origional plan was to get the truck runnig with the OEM T25's and shoot for about 300WHP and then I would upgrade down the road as things broke or wore out. but thats only because I have the OE TT manifolds an turbos in my hands. If I go single turbo I need to but a turbo. so I'd just do the 60-1 and fuel now.

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Are you planning on building up the engine aiming for that power? I could see the n/a setup maybe handling 400 whp or so, maybe, but at the power you're aiming at you'll definitely need to get some better internals. I'm sure you already know this but I just wanted to be on the safe side.

 

The 60-1 doesn't have the greatest of maps imo but it should definitely flow enough for the power lever you're looking for.

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Without high octane fuel, alcohol, or water injection you won't see 400whp on a VG30DE. Even then you will be driving a time bomb. Go check out twinturbo.net for some turbo NAs and see how well that went.

 

You can have a fun ride but if you're looking for 400 (or 550 like you stated earlier for sure) you're going to have to lower the compression.

 

Think about picking up a TT longblock, you'll thank yourself later on.

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Thats mu 1st truck VG30E, with a T3 .83 A/R Stage 3 turbine and a TO4B H-trim compressor, Z31 Sparco intercooler and under the tranny x-over pipe. I got 345WHP out of it with OEM Z32 370cc injectors.

 

as for the X-over I reused the Pass side manifold and brazed on a T3 flange onto the driver side manifold. then I connected the OE exhaust outlets on the manifolds.

 

Now I have a VG30DE-TT for my next project. but I'm thinking about going VG30DE-T

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Without high octane fuel, alcohol, or water injection you won't see 400whp on a VG30DE. Even then you will be driving a time bomb. Go check out twinturbo.net for some turbo NAs and see how well that went.

 

You can have a fun ride but if you're looking for 400 (or 550 like you stated earlier for sure) you're going to have to lower the compression.

 

Think about picking up a TT longblock, you'll thank yourself later on.

 

The only diffrence in the N/A's and TT's are the pistons. and I already have a VG30DE with Escort 10:1 pistons for a TT (they have oil squirters) and eagle rods so I'll see what happens, I think I'll be good to 550ish whp on race gas and 450ish on 93 pump gas.

 

My main concern is spending the money is getting all the TT parts to fit & work together in my truck, just to turn around and spend another $2k+ on a turbo upgrade.

 

The one and only reason Z32 guys don't do single turbo swaps is that they have no room. I have all the room in the world, and I'm wondering if a single turbo would be a good performance upgrade.

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The one and only reason Z32 guys don't do single turbo swaps is that they have no room. I have all the room in the world, and I'm wondering if a single turbo would be a good performance upgrade.

 

I hope you didn't take what I was saying the wrong way. I'm all about trying new stuff, just triple check your numbers and start conservative before going for the gusto. :)

 

Twins will always be a better match unless you fabbed equal length manifolds for a single, then it's a moot point, but there have been a few single turbo Z32s (most notably Z32Power.com before his RB26 swap) with great results. There's no wrong way to go when it comes to turbos. Have at and have fun.

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Escort will make any ratio you want, I guess they are actualy for a beefed up N/A but escort recomends 10:1 for street / strip action up to about 18 psi, although in the same breath they recomend a Nismo crank and rods.

 

I got the pistons chep from a guy who chickend out on building up his Z32.

 

but the engine is assembeld now, and I'm not cracking this $550 gasket set open again. although my tax retun might cover a set of 262 cams :D

 

 

I guess I'll just do the TT setup, I like saying "Twin Turbo" and I don't want to explain how I realy have a 93 300ZX TT motor but I fitted it with a single turbo. pluss I have most of the parts already.

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Ahh, nice deal. I can't believe anyone would really buy anything directly from them..... they're so overpriced that I could get a custom set of pistons made for my VH45 probably 2 or 3 times for the price of theirs. :lol:

 

With those pistons that thing will definitely have some very nice low end compared to a low compression setup and should get pretty decent gas mileage. I'm going to be running the stock 9:1 compression in my Maxima with a Holset HX35. I was using the 8.3:1 engine but the low end was just terrible compared to the 9:1. Going from 8.5:1 or even 9:1 to a 10:1 setup would make for an awesome power band. Definitely, definitely get some videos of it when you're done. I want to see what that thing will do. :lol:

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Very interesting!

 

As Mtcookson knows Im doing a VQ30DE-TT. 10:1 comp stock and all that. Im also planning on using T25's but I believe they are going to be good for the 420+ range. Its going in my '90 240sx :). Not a Zcar :(

 

I looked at a few fully modded stock turbo 300zx's and all of them were in the 350 range, with only one guy at 375. He had all the bolt ons and ran the turbos at 15psi. Pretty much blowing pure hot air from what Ive seen of the T22s they come with. The T25 should be pushing more CFM's and still max out at about 15psi.

 

Any way I need to start fabbing and get working on it. I hope to be done some time in may/june...

 

~Alex

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