Bachert24

iTrader: (4)

Obviously without actually measuring a bunch of crap you have to make some assumptions with numbers. I tried to be realistic on these so if you see any errors let me know so I can make more adjustments. I am not going to delve into my absurd list of mods right now. While some if it relevant, I want to just concentrate on hard numbers for the time being. Now please realize that I am not looking for an exact HP or 1/4 time. These are just reference points.

Target Crank HP=575
Engine Displacement=232
Running on pump gas with hopefully 11.5:1 Air/Fuel ratio
BSFC=.46 (estimated)
VE=75% (pretty sure I went low on this)
Mid Range Estimated RPM=6000 (i used a number where I would be close to top of the TQ band)
Peak Power Estimated RPM=6500 (I will have to look into cams cause I don't think my current one will push the RPM up this high and still make power)
I am going with an Air/Air intercooler with an estimated 1 psi drop and with an assumed effectiveness of about 70%.
Typical barometric pressure in MI of 14-15
Ambient temp=80 (went with a realistic summer temp on this)

These numbers will net the following

MID RPM:
Crank HP-531
Boost Gauge PSI=20 (yes i know i will need a perfect tune)
Pressure ratio=2.46
Intake manifold temp=146F
Corrected airflow=47.96 lb/hr
Crank TQ=465

MAX RPM:
Crank HP-576
Boost Gauge PSI=20 (yes i know i will need a perfect tune)
Pressure ratio=2.46
Intake manifold temp=146F
Corrected airflow=51.95 lb/hr
Crank TQ=465

Based on that info and looking at the Turbo map i think the best Turbo for this would be GTX3582R https://turbobygarrett.com/turbobyga...arger#GTX3582R

It looks like the efficiency is around 78% and is very close to the island.

With making super huge assumptions this would put a 3400 lb car at close to 11.1 @ 122mph in the quarter mile.

I haven't looked into any housings yet so if you have any advice i am all ears. Again for the sake of people trolling the crap out of this thread, realize these numbers are just hard numbers, nothing is set in stone and a lot of this is realistic, but also assumed. I don't need comments on how I should get a V8, I know they are better, I just like the V6.

FourG63 97GST

iTrader: (1)

dont reinvent the wheel, make a goal, see what the grand national guys do, then copy and paste. keep it simple. the R&D has already been done

Bachert24

iTrader: (4)

Only problem is that for all intensive purposes the 3.8T and 3800 engine have almost nothing in common. Trust me, my initial idea was to copy the G/N guys!

20psiofevil

You have more in common than what you think. I'd go with a 6262 .63 ar t3 and keep rpm around the 5800 range.

Bachert24

iTrader: (4)

That will significantly hinder my hp and 1/4 time though won't it? I'll check out the 6262. I'm not sure if you're aware but I can't use any of the Grand National parts. Literally nothing lines up right.

ramairetransam

iTrader: (18)

you need to go to clubgp.com and talk to the turbo gp guys . not many turbo 3800 guys on here .

Bachert24

iTrader: (4)

Will do

ramairetransam

iTrader: (18)

search for this guy on fb sal cannistraci jr , he has a 10 second street driven fwd grand prix. hes a long time clubgp guy and knows a lot about the 3800 and turbo setups .

Bachert24

iTrader: (4)

I appreciate the info, you the man!

slv02t/a

Also Tim King on here will probably be able to help. He had an 8 second TT 3.8 firebird. Don't know how active he is though. Used to work for a company that dealt almost strictly with 3.8 powered GM cars.

Bachert24

iTrader: (4)

Thanks I'll look him up, I appreciate it!

20psiofevil

What? The .63 ar? I run the 6262 on my ford 4.2l v6 with .63 ar back housing. The car run 103mph in the 8th on pump gas. The cam was oversized also. http://turbobuick.com/forums/threads...-power.416634/

Bachert24

iTrader: (4)

Yup I was referring to the. 63 housing. Like I said, I am learning and I know nothing about housings so far. I appreciate the link. Cool project. Installed an engine like mine in a grand national.