Original build posted here if curious:Shows all internals the motors has from top to bottom. with plenty Pics, blood and sweat.
https://www.thirdgen.org/forums/engi...-383-swap.html


After racing a high 12 second 112mph car and not winnign the lengths i wanted to its time for new rebuilt. Granted he had 800 pound lightweight on me and i had a passenger. He started in first gear at a 20 roll, i started at 1500rpm in second.

Dyno dons headers and Y pipe are sold. So that should pay for my new set of headers + the hot side fabrication.

Build plans:
-T76 mastermaster turbo
- Intercooler
- Quickfuel 750 Q series carb, (need send out to convert)
- Possibly Mike jones custome grid 224/224 turbo cam
- Snowperformance stage1 Meth KIT with possible sunoco race fuel/ additive and 94 octane.

Compression am guessing is around 10:1 - 10:5 ... I understand this is high compression, plans going to be running 5-7 psi max with the meth and race fuel so i am hoping to be ok .

Ovbiously this will be professionally tuned before driving on the street, Any help with local NJ area to turn the car, or even any area in Upstate NY by lake george with help. I will be startging this project within the nex moth or 2. I will be ordering the MEth Kit and the intercooler wensday as i screwed up my direct deposit.

If anyone has anytime on ther hands to post links of good piping and ebay intercoolers please feel free to share.
Theres 2 headers that am comtimplating atm.
http://xs-power.com/gm-turbo-manifolds-3.htm
or thiose twin turbo headers on ebay that face foward, Which am hesitant because acouple people have problems with the #7 primarie hitting stearing rack.....


Only thing holding me back at thiis point is the headers, and location.
Will it be easier to just buy manifolds off of some corvette or truch or wahtever and adapt hem? If thats the case how much extra pieces we talking to make them fit.

Cutom fabricartion is not an option.

Please work with me, i know orr and streat lethal are a major part in my quest to make this happen, so thank guys.

 

Tuning the carb for boost will be a breeze, either an LC1 or AEM will work, although many prefer the Zt-2 and Zt-3 wideband and datlogging systems....

http://www.zeitronix.com/

 

If you want my cam its 233/233 and I'll be sending it off to Jones this week to inspect to make sure the timing numbers are correct in relation to the dowel pin. Mine didnt seem to line up right so i degree'd it in to match regardless of what the dot to dot timing chain wanted.

Headers you may want to consider are 10secondgoal's headers over at theturboforums... 600 bucks or so, forward facing, and clear a TGO
https://www.thirdgen.org/forums/powe...r-headers.html
posted a pic in there

Or you could buy my setup so I can get his headers and keep my turbos under the hood

I got a treadstone intercooler. Medium price range..not ebay cheap but not top of the line either. Seems to do well but I have no actual data to back that up. My motor handled 18psi in summer heat and heatsoaked motor on straight pump gas...so its got to be doin ok.

 

Am almost set on your ca orr...

As far as the headers go, what you willing to price with.. , Remember am Single application, am going to get created o the hot side.

I wouldnt mind however facricating, some kind of 300zx turbo scoop where the header sits out of the hood, It might look alittle ackward but i could give it a shot.

Ho well you think the crossover pipe will turb out to the turbo sitting that high?

What yo u willing to sell for. Please dont say close to 600$ as i could see 10aecgoal myself for the heads lol

 

haha i'm not sure i can sell yet. I gotta see what I can do with this setup this week. I got about 450-500 into the pair and they are setup for twins...so using them for a single wouldnt be wise. Kinda negates the benefit but you likely could get the crossover pipes to clear stock hood with my setup. Just run a 90 bend and another t4 flange off the headers. Looks stupid but could work.

I'd just save for 10secgoal's headers or try to find the right pair of shorties and fab the cross over. I know fabrication isnt the option, but its almost necessary for a turbo setup

 

fabricating is an option, nmot sure much about favricatiorm the primaries itself but if i have a baseline to start with i should be good. I havnt messaged 10secgoal yey. but i heard they were not cheap. I could get about 525-550 for my dyno setup. If 10 sec head are up toward 800-1000 then ill pass

 

his are 600-650 and thats really a nice price for what you get.

 

will a 233/233 cam with miminum 5 -7PSi, produce more then my current setup am runnning now?


I ordered my snow performance meth kit stae 1 as a start and a Intercooler, we taking night and day to my compared setup?

 

+1 for 10secgoal's headers
if u want to save some money the summit 224/224 cam works really well in turbo aplications as well

id also suggest a bw s475 or s480 turbo the s475 can be had for about 600 bucks

 

What heads did you decide on? 5-7 psi on a 383 will move well, with somewhat half decent heads

 

Keeping my AFR's. Once i get the car to the garabge ill pull the head and check the piston to deck. I was hoping even if the compression was on the high side of 10:5:1, Cosmetic gaskets + Meth + intercooler + Race gas might be ok with 5-7psi on a pro tune.

Worse case scenario if the copression is at 11:1, Ill swap the pistons out seeing i have to pull the motor yet again for a rear main seal leak, pan leak, and change the trans line fitments.

Also buy going this route am pulling my AC delete box out, making my custom box, and relocating the msd box in the car and the battery in the trunk. Should be for a fine winter build.

Also already bought everything needed to do all the body work on the car. Just missing the paint ( havent decided )

 

Let me know the piston to deck clearance and we can select a head gasket to work. You normally dont want alot of piston to head deck (quench) height so cant go too thick on the gasket. 10.5 to 1 is achievable tho, and with ALOT of meth injection, it should run fine on 5-7psi. With my cam being fairly stout, you'll have lower dynamic compression too so it will help the situation.

5-7psi should put you near high 10's low 11's. thats ALOT faster than where you are at now.

 

http://i161.photobucket.com/albums/t240/wild84/Turbo%20Motor%202010/IMG_9924.jpg $700


From looks of it, i suppose i need to cut my radiator support and relocate the radiator? Possibly down and toward the front bumper while still keeping room for the intercooler.

Any word with the cam orr? not a huge rush, the car should be at the garage in a week or so, then sometime in november ill pull the head and check the piston to deck height. Before i order this insane amount of money for the headers i want to make sure my compression is not over 10:5:1. If it is, i might need to add a month or 2 on the build to get new pistons, unless someone wants to trade a set of AFR 76cc heads :P

 

http://www.ebay.com/itm/T76-Turbo-Tu...item2c580b6dc5

yes or no?

obviously am trying to go a cheaper route then 700 seeing the headers cost an arm and a leg

 

No. You'll want a .96 a/r on the turbine side at the very least....

 

The exhaust wheel is too small for your 383. It will cause high exh back pressure and be prone to detonation which is really bad in your case because you already have high compression. For 477 clams you can get a used turbo that is a better fit, or just go with a BW S400-CW75 and have room for growth.

 

Gonna try to package it up tonight and send it off today if possible. Else friday or saturday. Sorry for the delay just havent had time to do it.

Its likely you can sell those heads for a 1000-1100 and get new ones for 1250-1350 so the next cost isnt so bad.... Its up to you on how you want to approach that. Not sure if a head porter can carve out some CC's in the chamber or not.

 

Good luck with the new build ls4gxp!

subscribed.

try to keep it stealthy.... by keeping it all under the hood!

 

Well seeing the northeast got nailed by a nor'eastern in October!!! it pushed things back a few. Car was suppose to goto NY this weekend but was unable to.

Good update though :

Friday am ordering the Powermaster t76

Once my buddy gives me money for my headers, Y pipe, and the bird i will order these from 10secondgoal's http://i161.photobucket.com/albums/t240/wild84/Turbo%20Motor%202010/IMG_9924.jpg
According to the builder they will fit under the hood. Am worried about The alternator hitting the header, i have some issues with my serp setup as it sits ( being un-allighned ). Ill figure it out once i get to that point

Hopeing things will start taking shape soon. Worst case, if compression is too high ill sell heads and get a pair of AFR 76cc's and just take the few hundred hit rather then change pistons. Ill update once parts start arriving

 

nor easter! I heard. Better you than us.

Just get the heads now for a small hit, than no compression worries.

 

Sent my cam to jones to get checked out. Will let you know when I get it back and what he says.

 

I've been reading on some other forums and came across a subject that I find very interesting regarding squish height.

I'd have to read more into this subject on how this works on boosted applications to see if you can get away with a super thick gasket to really get your compression down but its worth a look.

 

Good read though I have no clue. Whatever am safe at with 5-7psi. Down the road ill change heads if I don't have to now

 

Tomorrows d-day on ordering turbo. A turbo friend suggested I go with a precision 67mm turbo. Said 76 would lag for only wanting to make 650hp. Suggestions please before I order something

 

It wouldnt lag with that compression... the precision may make 650hp but I still think a 70mm is minimum size for this motor. master power T76 likely a good option. .96 a/r Qtrim would work, but for 5-6psi, a .96 a/r T4 P trim could work just fine too.

Master power's dont flow like new tech compressor wheels that you can get from precision/garrett/etc...so need a slightly larger MP turbo compared to a precision/garrett.

67 probably could make 650hp but the MP is a bit more budgetary

 

Ok,

Does the ebay turbo piping and coupler kit work decent. Or should I look elsewhere. Also what size intercooler?

 

Powermaster brand new never installed, t-76 .96ar shipped $640. This is looking to be the one

 

I wouldn't recommend that turbo, not to mention, only wanting 650-HP won't last very long, as you'll eventually want more down the road. Lag is a thing of the past. Lag is when factory turbo V6 guys install a gigantic turbo without changing anything then they wonder why it lags. Engine compression, cam specs, stall speed, rear gears and turbo exhaust housing will dictate if you have any lag or not, not the actual size of compression side of the turbo, which is what your friend seems to be basing it on...

Good choice....

 

Agreed but just to note, on my setup with nothing more than going from a T60 to a T70, same hotside .68a/r T4 turbine, I did notice the 70's spooling alittle slower than the T60's and the track times dont lie. Showed a significant drop in the first 1/8 mile but started catching back up by 1/4 mile. You can have a bit of lag by compressor size alone IMO but its not the sole determining factor as mentioned.

A 383 with that compression will light up a T76 easily, especially a P-trim T4 hotside. I'd run the Q trim tho for a single. I run the P trims on my car for twins for 350hp each side and will be shooting for 500hp each bank next year. P-trim is good for that size and power. Q-trim be much better for single in the 600hp range.
A t6 would be alittle more delayed on spool but still be workable on a hot 383. Alot of guys run S400 turbos which are 75mm with T6 hotsides. Works well on 383's.

 

But your pointing out exactly what I was saying. I mentioned that you can't have a stock turbo car, upgrade the turbo without changing anything, and not expect to have lag without any other changes. By you stepping up to larger turbo's, a change in stall, not to mention a change in tune would be needed, otherwise you will in fact lag if you don't change anything. In LS4GXP's case, his engine isn't even running yet, so he can't be told that he is going to lag based on the size of the turbo because with whatever turbo he chooses to go with he will need to build around it ahead of time. He can go with a T88 if he wants to as long as he build around it and he won't lag at all. However, if he builds his engine specifically for the T76 that he wants, then later steps up to a T88 without changing anything, then he will lag....

 

True I guess it shows what you were saying but I did retune it and couldnt fine spool or power with the limited abilities of stock ecm/code $59. I THOUGHT my combination was suitable for T70s but I guess I was wrong. It needs more rpm, more air flow from heads/cam and thats exactly what i did to help that problem.

 

Well we know what the engine is, kinda not picking a turbo and building a motor around it. Picking a turbo based around my motor lol. Only thing that would change is the heads if need be. Hopeing not too though.

Either way i ordered the turbo last night. It was on sale for $640 shipped. Couldnt pass up saving over $200.

Master Power T-76 P trim T4 .96a/r.

Delivered my firebird to my buddy today, waiting on payment for the car and my header Y pipe setup, then i will order headers from 10secgoal ( only 2 week wait ) rather then 2 months from dyno don. Slowly but surely its coming together


Never know, maybe i will TT my next motor build seeing the headers are made to do so :P

 

The original question was will a 76mm turbo lag on a 383, and that is impossible to answer without knowing very critical information about the overall build in a whole. Not to mention, your engine build is most certainly not set in stone yet to pick a turbo based on it's specs, as there are repeated posts about which heads are better, and possibly switching them if things don't work out, not to mention a cam we know very little about so far. Unless you and orr know the rest of the details in private that we don't, there isn't much to go on without knowing the full cams specs, head flow, final rocker ratio, stall speed, rear gears, etc...

 

Cam is my custom turbo grind that was spec'd for a 383 using AFR 195's and designed for a peak near 5800-6000 rpm. Could be used with any turbo, singles or twins, but I had the intention of using twins. I changed to a 400 which uses same stroke length so the cam didnt have to change and it worked extremely well.

If he keeps his heads and does get into the 10.5 or less compression, I think it will work great with 5-7psi boost and really make some power. Spool will be NO issue with 3600+ stall and T4 turbo. Based on similar builds, it should do 500whp no problem on that boost. Possibly more.

 

Gears: 2:77 or 3:08's
Stall: staying with 3200 i had built.

Like orr said, his cam if jones comes back and says everythings good, which is 233/233 previously stated.

Rockers: 1.52, in my sig

Only MAJOR mod if needed to change would be the heads. And if i need to do that then i will probably end up with AFR 195 or bigger and 76cc chambers

 

Found a bbs turbo kit for sale for $700. Kit includes
Turbo header
Crossover Pipe
Driver's side header
Boost gauge
Alcohol Injection kit
Downpipe
Pipe to connect downpipe to catback
All oil lines
Tubing to run from turbo to the intake
Intake duct for the turbo and filter
2-BAR MAP sensor
Turbonetics WasteGate

Anyone know or think if my Tall valve covers will be in the way of a bbs header? No biggy to change them but am curious. This is not setup for a intercooler but i am still planning on buying a kit. Waiting for the turbo to be delivered

 

BBS designs headers are nice for smaller hp builds but could be improved. I dont like wastegate location on those setups. Thats the first thing I'd do is modify that.

It may be enough header tho for 600-700 hp. Backpressure may be higher but it could work.

Mr. Jones got back to me today. Said cam is fine, spec's out with no advance when my cam card I believe said it had some advance ground in...so maybe thats why i didnt see it open and close when it should have. He's sending it back with new cam card.

 

Right when i feel i found a great deal it gets shut down lol. I have no clue what the future brings me, but i dont want my headers to hold me back. So i guess ill pass.

Good deal on cam, ill send ya a PM about arrangements. I screwed myself with paypal and buying the turbo at the same time. Me being a noob with all that put me in some seriouse debt on one of my accounts lol Once i get that straightened out ill let you know

 

CSU wants 500$ to convert my carb. Should I just sell it and get a CSU carb?

 

 

noboostnogo is selling his complete turbo motor for 12K. Wonder if he'd separate the hotside? you can ask him.

 

Got my cam back from Jones with new card. Let me know if you are still interested and I can ship it.

 

How do you want payment, cancelled my paypal so that's not an option. Also where did you buy your mandrel bends from? Am going to use a hooker header on the driver side and a custom log header for passenger with the hooker flange with stubs. Also can I run 1 5/8 primary on one side and 1 3/4 on passenger?

 

Am going to copy "just another blow thru build" header

 

send money order if possible, PM me for details.

yeah you can run 1 5/8 and 1 3/4 mix, shouldnt hurt anything. If you buy the stub out hookers, they come in pairs so it would make sense to build 2 log/header hybrids to match but its not necessary. Its just an expense part for what you get.

If you can just get one thick flange, and weld in your own stubs that will be cheapest. Just try to use an old head to bolt the flange flat, and then weld in the stubs as much as you can to keep it from warping too much. Either way, you'll likely need to have a machine shop mill/belt sand flat the sealing surface.

Columbia River Mandrel Bends has alot of good stuff. So does Summit racing. Most of my header piping is all from Hooker from Summit racing. The cone transitions on my main log section come from Columbia River.

 

I might have a guy interested in my heads for $1200. Few hundred dollar loss but i would feel better to not buy new $600 pistons to lower the compression.

So if this goes through, whats my options with heads now. Can i get away with not going AFR with a goal of low low 11's high 10's on boost? Trickflow 76cc or 72cc heads are still $1400, so is AFR. I would like to get a head that will produce those numbers without going over the money spent on selling the AFR's for $1200. Also note i have to buy springs i would imagine to handle the lift. I think beehives were $150-200? Orr off top of my head not sure what your lift was, if you still have your cam. I hit a hard time in life last few months, but am back in the game again. Tear down starts first week in march!!!

I can get my hands on a set of 68-72 Heads, but i think there 165cc 75cc, seems too small. I dont want a redline of 5500. If i can buy cheaper heads and dump most the money in head work at the shop would it be worth it that way? Dunno what to look for here with a $1200 budget on 10 sec heads

 

Yep still have it. Been saving it for yah. No rush to sale. Any set of decent heads with a 70+cc chamber will cover your goals. I'll look around to see what budget stuff is available. I think Jeg's heads are a great deal. ~1000 or so but may or may not need new springs.

My cam is .564" with 1.6 rockers. Not huge at all, comfortable smooth lobe.

 

Is that 233/233 cam close to any other cam that is made by a major manufacturer? I've heard you say it was a custom grind. ...You don't have to answer that if you can't or don't want to...

 

Absolutely, V6 guys are running their ported irons well into the nine's...

 

Orr, whatever happened to the cam you got from Bret Bauer...?