I have been up and down on trying to figure out what turbo to run on my 92 with a 383 to achieve around 650rwhp. I have been told by professionals who build for racing that a t-70 with a .68ar will do that and if I want to bump up the power 500 rpm to go with the .96ar. I have heard from most garage builders(not knocking anyone I am one too) that I need a t-76 for that motor. As it is the car makes 400rwhp in the trim now so knocking down the compression adding a way better head and boost cant see where a big turbo that supports 1100 hp will be needed to make 650. I would love to hear opinions on all this and why the smaller turbo wont cut it.

 

383 is flat out too big for a mpt70 with a .68 a/r. there is no arguing this.

i personally am shooting for 600rwhp with the mpt70 .96 a/r, on a 305. reason for the 305? i firmly believe the turbo would be maxed out too soon with the 350.

 

vs racing who does turbos for everything firmly believes that it isnt too small for what ever reason. I asked to buy a turbo and gave him my combo told him I wanted 600 rwhp and had a mpt-70 at my disposal if it would work and he said to use it rather than selling me one of his. So had a chance to make money off me but chose to say the 70 would do what I wanted. Really doesnt matter now because I just got a deal on a turbonetics t-76 with .96 ar ceramic ball bearing ,all the oil plumbing,a 3 inch down pipe, 3.5 to 4 inch down pipe and some clamps and cold side stuff all for 900 bucks with less than 10k on it. Was on a 331 sbf in a mustang that ran 113 in the eighth and 138 in the quarter on 15 lbs. Said it had a lot of lag on the small motor and came in at 4000 rpm and should be good on my 383. So whether or not the other would work I am going with this deal as that turbo goes for close to 2k new and I cant pass it up.

 

S400 turbo would be my choice.

 

yep s400 would be plenty and would have room to grow incase you wanted to add high octane fuel and more boost for higher numbers but would still make the 600 rwhp or so on fairly low boost. The reason people oversize is so they can reach their goal without running out of turbo or having to run the turbo full out to reach their goals. The higher numbers the turbo is capable of the longer it should last at lower performance levels where it isnt pushed to its limit.

just go with a s480, its a big nasty turbo and according to most on turbomustangs.com you can contact dave at majecticturbo and get one for only $600 bucks or so (CANT BEAT THAT!)

 

Ain't boost neat?


My Kawasaki 750 Turbo



Is this big enuff??

 

s400 is way too big for what I want. I have talked to a few mustang guys with larger motors that run them and they all are unhappy with the way it spools up. most dont reach full boost to 4000 rpm. I never want to push this car to over 650 that is like a limit on just about all the parts left unchanged on it. I dont want to have to run a nine inch in this car and the bottom end of the motor wont take it either. I am going to drive it in a 500 to 550 trim and have up to 600 to 650 in reserve if I just have to win some street race that is that close. Like that hidden 100 shot you really dont use unless you really need it. I have a 94 z28 with a nine inch and full cage and that car is going to get a 88mm for the 392 cu 227 afrs that is in it. That will be my fast car. the 92 is for a fun daily driver. It makes 400rwhp now n/a and is not quite enough and nitrous is not there all the time. I want it to spool up either right off the bat or by 3000 max. I have a precession industries 3200 stall so that will help it if it needs to 3000 to make full boost. But the s400 is too big for what I need or want from the car, period. by the way sweet bike. See you are from J-ville too. Look forward to smacking it down when I get done with the car.hehehe....

 

Why dont you pick up a turbonetics t76 then or one of their t70s models. They are gonna be the highest performing t70 series you can find but you better get ready to shell out the dough. It sounds to me like you might be more interested in going with twins. Go to turbomustangs.com under the gm section and look up "how long till it grenades". A guy named marty was making some serious power on a stock block with two t04 turbos if I remember correctly.

either way, with twins you could go find some junk yard turbos, have them cleaned up and inspected and then have boost that builds around 2000 rpm or lower and makes good power all throughout the rpm levels.

 

LT1Z350,
I live in the Crystal Springs area on the Westside. I usually show up at Sonic on Beach Blvd. on Sat. Nite. I rotate the fleet. My daily driver (Mustang GT), one of my 4 bikes, boss's red 89 Formula Fireturd and maybe this Sat in the Dark Cherry 96 Imp SS.

 

looking at either a turbonetics t76 ceramic ball bearing with plumbing and down pipes off a mustang with 10k for 900 bucks or a precision t74gts off a supra with 5k on it for 650. both seem like good deals for used stuff. no twins as the room on the car with a/c will be crammed. I want it as simple as possible like I said as possible as none of it is going to be simple. I have 800 to spend so dont need to look to the junk yard and why I started looking at master power to start. Don know of any others that are in that price range new but the s400 series monsters that I will not even consider as they are tooo big.

 

been there a few times with my other 9 sec z28. cant ever get a race with it though so quit going. I am in orange park kinda a drive for a car with full spool and huge solid roller. I have my 96 lt4 formula that runs 11s I can come out with now since the 92 is going through the transformation now. Have to come check out the kawwie I have always wanted to get one and would like to see it. I grew up racing the big green 3 wheelers 250cc class in chicago. Always a kawaski fan since my first 80cc dirt bike to my dads two kz 900 and kz 1000 race bikes.by the way jk about the bike I am sure it is really nasty.

 

Ignore the "garage builders" and get a Physics book. Then listen to the "garage builders" and see which ones make sense.

No wastegate? I guess you have the turbine size right on the money. What size (frame) is that turbo? It doesn't look like a Garrett unit....maybe an older one. Who makes that IC? Where did you buy it?

EFI or carb with pitot tube?

This is the kind of setup I like to see. The conversion from carb to EFI is what always stops me from putting a turbo on the bike. I can't seem to find a reasonably priced 43PSI fuel pump with low GPH in a small package.

Thanks,
Junk

 

how about a formula that uses cubic inches and air flow of some sort to come up with what size turbo for a application?

 

turbomustangs.com

http://www.theturboforums.com/turbot...lectcompressor

all you need to know, thats why its called the turbo bible! This will help you decide how big of a turbo to buy based on airflow and compressor maps.

 

There is no discussion about turbine maps there. I think the turbine topic (and math) is what confuses many people.

 

great reading there, thanks. this should help my learning curve quite a bit.

 

I think if you can learn all you need to know about turbos and you cant read a compressor map, you should stick to nitrous. I didnt need someone to tell me "how to read a compressor map", but once I made all my calculations for my needs, I could look at a compressor map and compare my calcs with the axis and determine which were efficient for me and which werent.

 

You've never heard of the Kawasaki GPZ-Turbo, and your supposed to be a turbo guy Junk.....?

Here ya go, Click Here....

 

amazing for 1980s technology. If it was done today it would be ridiculously fast especially if on the new 1200 bike. I sat for a hour watching bike vrs car races and a bunch of the turbo bike stuff. Cool stuff.
----------
also anyone got the math handy that can run my combo through and see what it shows for what I need? 383 with a 650wrhp goal not sure what other stuff is needed but alot of info is in my sig. If someone has it and wants to run it or send it to me so I can plug it all in.thanks

 

It was, Click Here, Hyabusa Turbo. Warning, not for the faint of heart....

 

This calculator / calc. will give you everything you need. After you play with the calculator, take a look at the Garrett GT42 comp. and turbine map. at the www.turbobygarrett.com site. You can use the PR (press. ratio) and lb/min airflow and plot it on the comp. map. You can use the turbine lb/min and plot it on the turbine map to get an estimate of when it will spool.

http://www.gnttype.org/techarea/turbo/turbocalcs.xls

Nah, still learning here. I have heard of the Kawi turbo bike but have never seen a picture of one. So that is the Kawi GPZ-turbo bike? It doesn't look very adjustable without a wastegate on that thing.

 

Call dave at majestic nd talk to him. an S400 would be good.
Really FULL boost in by 4k is a good street setup.

Do you really want to annihilate the tire in smoke with full boost on the street at anything under 3k. Small turbo is gonna do just that.

I know with the 383 LT1 im doing I plan on a S400 or S480. My Motor will spin to 6500 or so. I want boost to come in a little around 3k and up.

your tune ,gears, converter are all gonna play a part of your spooling also. As a good turbo guru on turboforums said. If your havin problems spooling fire your tuner.


Uuhuuu.. Do a search for GHOST RIDER. 500RWHP hyabusa

NICE BIKE.....

How about this turbo....

http://www.cecoatings.com/images/gsxrTURBO2.jpg


ANYWAYS. to the poster in question.

Get the T76 and sell your T70. to offset the cost.

 

More Info for ya...

These are some average street sized sbc motors vs turbo numbers.
And you could use the smaller turbo on the bigger motor but,
you are going to build back pressure and heat.

* 305 = mp 70 (it isn't 70mm)
* 350 = 70mm-76mm
* 383 = 75mm-80mm
* 400 = 80mm-88mm

Hp depend on the turbo and air flow.
If the motor can't flow, it's just back pressure.
Back pressure doesn't = hp.

If you are looking a street driven car you need cid.
95% you will not see boost, so the motor is what
hauls you down the road. I would do the bigger
motor 383 and look at upgrading your turbo.

 

sounds a lot like a post i've seen the other day

 

thumbs up. Get back over there and post some update pic's

 

id go with the 76 as a minimum.

 

well I ended up buying a used turbonetics t-76 that was only used at the track and has 11 passes on it before he decided to go larger.(88mm) It has ceramic ballbearings and comes with 2 down pipes 3 inch and 3.5 to 4 inch, a few flanges for building the headers, clamps, and a bunch of 2.5 inch pipe he had left over from his build and the oil plumbing. Got it all shipped for 950. I tried to find what the cost of it new was and only found prices on the regular bearing ones and it said call for prices on the ceramic upgrade and they were 2400 bucks. So feel like 950 for a near new turbo was pretty good. Thanks to all that chimed in and helped. I would have concidered the s400 but it is too damn big! That thing is massive and space is a premo now with having the a/c on the car. I have the pan off the car now I just changed the bearings over to coated H bearings for the added stress and thought it would be a good time to plumb the fitting. Anyone know of the top of their head what I need to use? also the best place for it.

 

line the return fitting up with the front main cap.

as far as the fitting, LOTS of people take a punch and hit the pan, then dip a drill bit in grease and go to town on the pan. all done on the car. anyways, get a -an fitting preferably in the -12 size and just jb weld that sucker on there. or go all out and actually weld it on.

 

A little too overkill though, I've seen Ducati Turbo's running deep into the 8's, with much less horsepower, w/out the annoying lift. I have some footage that I took of a few Busa's and Ducati's going at it in the 1/4 over at e-town, if anybody is interested....

 

I welded a -10 fitting in the pan at the angle part in the front right under the 1/2 bolt so had to use a wrench to tighten it but no biggie. So there it should just roll into the pan and not disturb the crank.

 

sounds good. the main goal is not to hit the crank, that is correct.