383 with LE3 Heads, Custom Cam, Ported Intake by LE.

Assume it has all the fuel it needs and MSD 6a+... Stock PCM with a tune.

I talked to Nick about this before but I wanted to pound more questions into him but he has been unreal with help since my motor being built so I wanted to lay low with some until I have some hard cash to bring to him. Nick has done so much for me so I think it's about time he gets some time away from me now. haha

But Nick did suggest a T76 with 9:1 cr. I originally told him I want 600whp on lower boost and whatever on low low boost... but I guess the ultimate goal (when I asked him) was 600whp on pump gas. Plans have changed and I don't want to bother him until I get a little more serious on the purchase.

I want the most power possible on pump gas. I want gobs and gobs of power! But not like Supra power... usuable and efficient power. Racegas is something totally different then what I want. I am a street man and race gas won't be in the car all the time. At most meth will be but that's it.

Only problem it is through stock LT1 castings. I might go with AFR 220s but those are sooo expensive. I am sure the LT1 (LE3) castings will suffice though.

Any suggestions?

P.S. Not a knock against you Nick... I trust my car with you WITH MY LIFE on the line... but I feel bad bothering you soooo much!

 

I forgot to mention I will be driving this car a lot so an all out race type turbo is out of the question. Sorry

 

i'm running a 383 with a T76 Q-trim and expect about 700-750rwhp on pump gas... I went with Trickflow heads because a set of castings are under a grand. With a good port job, they flow good too (if i remember right, mine flow 305 on the intake and 224 on the exhaust). Their only down side is the combustion chamber size -- AFR makes heads with a lot bigger chambers if you want less piston dish.

I'm not sure what pistons he's putting in your car, but with stock heads, I'm assuming something with a big dish...

For turbo, there's nothing better than a T76 GTS in a 76mm.

 

So you want 600hp? From what I have seen you should look no further than a Precision T-70. A T-76GTS is WAY overkill for what you are looking at. The ported stock castings are pretty impressive actually. There is one car ( that I know of) that is making 1,000RWHP on Advanced Induction Fully Ported STOCK castings with a 355ci and a T-76GTS. I know this is not even close to what you want, but it goes to show amzing things are possible with stock castings. Out of curiousity what trubo kit are you going with? Or are you building your own??

 

If you want the best of both worlds, then go with the new 76MPS from T-netics. We have been testing them againist the other current 76mm units on the market. They spool faster, make the same basic power and cost a little less now as well...at least for the time right now. Awesome units. They are the same units we are using for the Twin Turbo Viper setups. So far we have gotten 1287rwhp/1299rwtq @ 22.5 lbs of boost on a 520ci SRT-10 and our customer has made some pulls above 27psi and well we can't publish the results yet, but its boat loads more....

Jose

 

T76 for 383ci.

 

Mild setup... I'd run a T70.

 

383 + T70 = lots of backpressure. I recall an LS1 member made ~600rwhp/650rwtq with a T70 and 383 LS1 @ 14psi...alot of psi to only get that much power. A t76 could have made that same power at probably 3psi less.

A T70 will acomplish his modest goals, but why not step up to a T76.

 

Thanks Chris... you're just jealous! haha

I want more then 600whp on pump gas. I want the most I can get from pump gas. I would love to make close to 700 on pump and 900 on C16. But that might be a little out of my reach. haha

 

He could always step up to a larger exhaust housing to deal with the back pressure. Either way.

I'm not jealous... my car runs.

BTW, buy a bike. Cheaper and just as fast. 400lbs, 160 hp, 14,000 rpm And you can turbo them.

 

a T76 GTS-H means it has a 76mm trim on it right? 76mm wheel?

Because doesn't a GT3582r have a 76mm trim on it? Or something similar to that? I am trying to find out the differences between the two and why the T76 GTS-H is better.

 

By the way... Why is the T76 better for a DD? Why would a bigger turbo be worse? Going with an 88 or something?

 

The T76GTS has a 76 mm INducer, while the GT35 has a 76 mm EXducer. The inducer is the minor diameter of the compressor wheel, while the exducer is the major diameter.

If you want to compare the 2, the T76GTS has a 102 mm exducer and will support about twice as much power.

Most people size turbo's by the minor diameter because gas sonic velocity in the inducer is what limits max flow (i.e. choke flow).

Mike

 

When you say inducer/exducer. You mean the inlet/outlet of the turbo? I am a little turbo illiterate (as you can see).

I am trying to learn about them though. :-/ Do you know where I can read about them and a place where they have diagrams explaining everything? Like a full and complete turbo system. Then explaining why certain turbos work well with certain motors to produce maximum efficiency?

 

He means,


DP = inducer

DG = exducer




Also this link will help...

Turbo Help

Jose