To Do Or Not To Do?


I have an 92 gxe, sohc vg30e engine as yall know. But im about to get ready to do this turbo project ive been wanting to do for so long. It's a custom twin turbo project. I have 2 garret t04 turbo's, a greddy type s BOV, tial 38mm wastegate, 24x12x3 front mount intercooler,walbro 255 fuel pump,jet chip,msd,FMU,hks s-afc, greedy oil cooler, and catch tank. And i have a few other things to throw on. I know a guy at a shop that will put all of it on, plus do the custom piping and custom turbo manifolds for $800. I wanted to know if this sounds like a good deal, not alot of Vg turbo's around, and im tired of seeing the same civics and turbo supra's around. Give me some feedback on what kind of approach I should take. Plus if u agree, what is the compression ratio on our vg engines so I can know what kind of psi I could set the boost at if I go thru with it. Only a 2 week downtime so tha's not that bad. Just give me some info. Later.

 

That jet chip is going to rock the world!

 

My brother has a 96 maxima se, and when he got hisecu chipped, we felt power throught the whole rpm band, and it's jet's computer chip. But I just really want feedback on this project, because if you guys think it's a waste of money I want to know, but also would be the first twin turbo VG around. At around 7 psi. Just help me out yall.1.

 

GXE auto with a pair of T04s ??

 

do yourself a favor and do some heavy vb modding and TC upgrade. If you dont then your tranny will show itself. Literally

 

Ohh yeah can you give me the name/address of this shop becuase they might see me in the future if they do it that cheap.

 

Okay if you say so. But my question is. You state you already have all these parts and now you want to ask us if you should go though with the project????? Um you already bought all these parts. Your "project" doesn't make sense on about 3-4 levels but you must have researched everything before buying the stuff correct?

 

i really wouldn't go twin turbo. there's lots of room in the maxima's engine bay... but not that much for a twin setup. plus, these days there aren't any benefits of going twin over a single setup. single can spool just as good when sized right and can supply tons of power at the same time.

other pros of going single is, less parts meaning less money, less fabrication meaning less money, less of an absolute piping mess and headache, etc. etc.

just go single. turbo is definitely worth it because it brings the maxima to a whole new level of fun... just keep it simple and cheap and go single. also, not sure i'd mess with the jet chip. just use an s-afc, e-manage, or have jwt reprogram it. unless jet will program it the same jwt does, i wouldn't use it on a boosted car.

also, to be on the safe side you'll need bigger injectors. 260's at a minimum but i'd go with 370's to has some room to play with. also, get rid of the fmu. you shouldn't need that thing. at the most you should need a rising rate fpr that raises fuel pressure on a 1:1 ratio. the fmu raises it up way too much and is basically just a way to cheat and get out of buying bigger injectors. its also quite harsh on injectors when you start raising the fuel pressure up real high.

good luck with everything.

 

hmmm...no mention of accounting for fuel and tranny issues...

2 weeks...good luck with that...

 

Well I had my tranny just done over about 4 months ago and haven't driven the car that much, so i have less than 1000 miles on the new tranny. They tuned my vb so my car shifts much quicker and smoother than the normal vb. As far as fuel, i tried to get injectors but they are hard for me to find for my car. I would like to know a site, or a place that carries injectors for the vg, 370cc. The guy at the shop said two t04 turbo's would be to big so im just going with 1. I have the fuel pressure regulator just didn't mention it the last time along with the stage 2 JWT cams. Im just ready to get this thing going and hope I don't run into any problems doing it. I still am trying to figure out what is the compression ratio on the vg engine, because I would like to know what is the most boost I can run on the stock internals. Hit me back with some feedback. I heard the block on the vg is strong, but I don't know how strong. Thanks.1.

 

9:1 compression. not bad at all for boost.

www.twinturbo.net for 370's. there are guys selling them all of the time because they are upgrading to mega-huge injectors.

vg30e(t) stock is said to handle about 300-350 hp. block should handle a lot, crank 300-350, rods possibly 300-350, pistons... not sure at all. you can upgrade to the vg30dett internals which are said to handle 600 hp due to being forged (crank and rods) and you can get some off the shelf forged pistons from there. the only thing about the tt crank is that the snout needs to be machined a little to accept the timing belt sprocket, oil pump (i think), and crank pulley.

i'll be throwing the tt crank and rods into my spare vg so i'll be able to give everyone a better idea of what machining is required when that's done.

 

The stock Compression ratio on the VG engine is 9:1. This may be incorrect but I doubt it.

 

can't find 370s? ummm, that's the easy part. look around on all the other nissan forums. Z forums, 240 forums, SE-R forums... you can pick them up for under $150 a set anywhere if you look around.

and you don't even know what the factory compression ratio is? it's in your service manual, and I can find it in about 15 seconds.. if you don't know that kind of stuff, it's just as bad as walking onto the front line in battle with no gun or armor.

do some legitimate research before you start, don't just buy a bunch of parts you've heard about and hope they'll work.

In fact, I'd like to see some pics of all this stuff. I'm hesitant to even believe you own it.

 

So basically I can use injectors from a 300zx twin turbo right? Someone I knew had a 90 maxime se, but I didn't believe he had those injectors in there but I guess he was telling the truth. I guess this will make me have enough fuel to go with the turbo,walbro 255 fuel pump,fuel pressure regulator,s-afc and 370cc injectors once I purchase them. I knew the compression ratio on the vg engine's were good, but I didn't know the exact amount. So a 9:1 ratio should be good enough for about 7-8 pounds of boost on stock internals right? I just want to know what should be the limit that I should never aprroach of boost with stock internals. Im pretty sure 7-8 psi should be good for another 60-70 hp. Im looking to be one of the fastest vg's around plus I got the money to dump on alot of custom parts. I have all the parts, but im just waiting till next spring about feb,march to throw them all on. Im in ny, can't drive fast on snow so I misewell wait until the spring time. I just wanted to know if it's really worth it.Thanks, and im still up for all opinions and feedback.1.

 

seriously...you dropped a lot of names and numbers.

what's the A/F on the turbo? what compressor?
what kind of intercooler?

pics would be great man.

also when do u think you'll be done? people put out those dates and NOT ONE MEMBER accomplished anything in the time they said they would finish.

Thanks!

 

you really cannot guess exact psi ranges becuase the variables fluctuate too much. With the right setup you can gain 100hp/tq off of 6-8 psi easy. But what exactly is your setup? Mtcookson probably gained 60-70 hp with his setup but it isn't tuned properly. I might guess that is because he brought a 300zx to toy around with. It really doesn't matter if you have a turbo in the winter time. Actually it's easier becuase the heat is down on a turbo app. Warm weather is when the trouble occurs. BTW do you have an intercooler? The hp range increases a lot more with the colder/denser air molecules. With the T04 turbo what is it's AR? What type of power curve are you looking for(Lower rpm boost or higher rpm boost)? Do you race via highway or track? Most of your boost WILL come at a higher range RPM meaning you'll be burned off the line for about 8 seconds (damn VG sucky sucky upper range hp\tq curve)

 

i know that at the very least i'd be pushing 210 bhp since that's what the engine pulled stock. now i have a better flowing intake, exhaust, tuned much better, etc. etc. so i'm probably pushing a bit more than that and i'm still at 7-8 psi. that's on 8.3:1 compression. with 9:1 it will probably be substantially higher.

 

The only thing that has me concerned about this whole project is really my tranny. Even though it's a rebuilt tranny with less than 1000 miles on it, with a valvebody job and a tranny cooler, it's not a bulletproof tranny. I wanted to know what is the most HP I can get out of it without blowing it and having another problem on my hands. Since no one has ever turbo a vg auto, i guess i will have to find out my own way, hopefully it's not the hard way. Any Opinions on what else I can do to my tranny besides the things I have done already will be appreciated. Thanks.1.

 

a rebuild using higher quality parts. www.importperformancetrans.com could probably do something like that for you but it would be quite expensive. better than paying to get a regular rebuild for the tranny though.

 

Screw an auto. Convert to a 5-speed save the money. Besides getting a tranny cooler will limit you intercooler size.

 

i disagree

 

Since you have all this stuff already, can I see some pics? That would be cool thanks

 

You may be right.

 

You gave up fast.

 

I guess he was guessing

 

yeah, you can set it up to where a tranny cooler wouldn't even get close to an intercooler.

 

I made guess because I'm thinking of a front mount cooler and the most obvious place where mounted. After the turbo install engine bay space is limited thus making even more fabrication a must. Besides most of the guys are way more experienced at these installs.

 

I just used my intercooler for the tranny cooler too. It wasn't hard and only took a little custom fab work at my local shop.

 

just get a VE...

 

I think having a turbo VG will have a larger output than a fully modded VE with bolt ons.

 

If you direct swapped a VG30D-T from a Z31 turbo, you will have slightly more power than a stock VE. 190hp vs about 210hp. VE with all the bolt ones will get you to about 210-215hp. A VE turbo w/o no IC, crude FPR and only 4-5 psi will get you to 250-270hp pretty easy.

 

It's really a question of.....after you drop thousands into your car, how are you gonna accept the fact that you are still gonna be slow, just not as?

 

If your not going to do the project.. send us all christmas gifts

I've seen stock GN engines make some serious power. Been tuning them for years now. This is my first "import" experience so I'm learning alot. Mike Cook's been a great help along with a few others.
I have a single turbo VG in a 89 Max Using mostly recycled GN parts. The process did not have the car down one day. It might have gone with no exhaust or partial exhaust for a day or two but It was driveable.
Definatly NO need for twin turbo. If your not a experienced tuner you'll need alot of help or just pay someone who's got references. This isn't like changing your oil by anymeans. It takes patience and time to tune a car. Everyone just expects a Microwaveable turbo setup. Set the timer to 30seconds and it's perfect. Well it's not just that simple. I'm happy that my car's drivable with no real "tuning" other than simple TPS and Timing adjustments. All the fun Tuning happens when I get the injectors and romulator installed. Then we'll see the limits of the VG.
~Scott

 

Mark

With enough time and a proper build you can actually make a pretty damn fast 3rd gen. I'll show you guys soon enough.

 

Klown's right:
I've seen alot of people in the Buick Grand National crowd and the small block chevy crowd I usto run around with buy all the "goodies" lots and lots of money in the car not get the results and go slow. Bigger is better and more is better isn't always true. Beliving the car mag's and fish stories from buddy's won't cut it. Money will buy alot of parts but it won't make it any faster. Learn from guys who are making the power.. why? because they've done it!

 

I am still gathering the last bit of parts for my turbo project, and the shop suggested that I try to find a performance metal head gasket for my 92 vg30e engine. Im having a hard time trying to find one, I wanted to know does anyone know where I can find a metal head gasket at. Also, will head gaskets from some of the 300zx's fit in my car. Thanks.1.

 

stop wasting money and just use the stock...you probably won't break 400-500 so why worry

 

Let's just keep the the dreamy dreams in one thread okay? Thanks. And I thought you were gonna show us some pics of your equipment?/ I wanna see

 

Im not lying about anything in this thread it's true. I have all the parts and im going to turbo my max. Yea u think because im a 20 year old in brooklyn and just wants to start a long thread just to get attention. It's not true, I work at the DA's Office and I have no bills, so the money I make goes to my pocket, i have no problem paying for a custom turbo job because I have the money and no bills. I wanted to turbo my maxima from day 1, and I will do it because it's something that I always wanted to do. I have no time to come on here and lie about parts and what not,im just trying to gather more info and try to get alittle bit of help finding some parts, that's all. By the time april or may comes, all of yall will have forgot about this thread and forgot that I was doing it and probably forgot about me, but just remember the name because I don't want to post pics of parts, I want to post them inside of my engine bay. So if anyone knows where I can find a metal head gasket for my 92 vg30e engine I would appriciate it. Or if you know any other nissan cars whose metal head gasket would fit on my motor I would like to know also. Thanks.1.

 

5th item down-->

http://www.nissanparts.cc/catalog/?section=316

when you're done, post pics of the bill too to show how much money you wasted