Precision 6766 options
 

I'm building my FD for mostly street with some track days hopefully...Looking to make about 450/500whp with minimal lag. I decided to go with the precision 6766 and was wondering what options you guys would go with.

Right now I'm thinking about going with the T4 divided .84 A/R

the other option would be the T4 divided 1.0 A/R



My other question is should I go with

"Ported H" compressor cover 4.0" inlet/3" outlet

or

"Ported S" compressor cover 4.0" inlet/2.5" outlet

I was leaning more towards the "Ported S" for less lag.


Thanks guys!

Max

I don't auto x but I have a 6766 and I did the ported H cover with divided t4 1.00 hot side and I get full boost (18psi) by 4200rpm and pulls hard all the way to 8500rpm.

Truthfully you should be able to hit your power goals with a PT6265 (or PT6266). I was bumping into the 470whp range with my PT6265 without stressing the turbo too much (staying below 20psi). I was also seeing full boost by about 3,600-3,800rpms.

67 is going to lag a bit . 62 will be more suitable and responsive for the street

PT6265/PT6266 will be more than enough for you.

The turbo will do 500rwhp without getting too crazy. I have some dyno sheets and a video in my build thread.

Get the S cover unported. The H cover has a weird powerband, it "comes on/wakes up" around 5-5.5k. I personally tried both.

thewird

Just like you my car is 100% street with 2 o 3 track days a year, went with PT6766 with 1.00 divided. I have full boost at 3,900rpm. Great turbo, lots high end power.

Is this turbo really ideal for the lower boost levels? I know the piston guys have to ring them to 35+ psi to get into its efficiency range.

lots of us aren't taking these turbos into their efficiency ranges.
if i recall smg944 didn't really start making goodpower to warrant the size of the turbo till 25psi

would it not be better to use a smaller turbo and still make the 500?

correct me of i'm wrong please. i'm still use to the Evo world where we ramp up the boost to 35-40 on stock motors lol

I sent you a very helpful pm with some good advise. Let me know if you need anymore information.

i got a 6266 1.15 a/r 40 miles on it 4sale, i never got to push it barely got into seeing any boost , just once or twice at 10psi, saw full boost at around 3800 rpms just as fendamonky said. great turbo , very responsive for a 62mm, and i still got the warranty card unfilled out thats how much ive barely used it, havent had a chance to even fill the card and send it back. good luck with your choices

I've been going down the same direction. I spoke with Sean at A-spec and he recommended I run a 6466 because the power will come in a little sooner and still make 480+ rwhp at under 20psi or so.

My pte6766 cea bb Ported s with .84 divided pump gas on the same setup as gt4094r .85 divided on e85 up to 5 psi untuned bosted slightly better than 4094, on the on off response it was quite better than 4094, how ever didnt get a chance to test it all out, my tuner over boosted to 22 psi stock map sensor pfc blew the engine on 3rd dyno run, I am building a setup with .96 undivided housing
T4 undivided short manifold on pte 6766 should have it ready soon for tuning

Huh?

You were set for 5psi on a pfc base map and your tuner boosted to 22psi?? So confused by the words you typed... Who is your tuner by chance?

Someone forgot to set the fuel cut or forgot the stock map sensor was being used.

thewird

Has anybody gone 'all in' on a 6766 yet? I know that they make more power than the 6765 it replaces and SMG44 (I think) has made a significant amount of power with that.

If/When I get one, I'll def give it a go:icon_tup:

I installed the pfc and dont have the datalogit, the fuel ratio was good to around 5-8 psi and i would back off soon as it started braking up, took it to steve kans dyno to tune he was out of town so a friend of ours had the datalogit and started tuning, the car was boosting very fast on the dyno and human error I gues fented a rotor, so on the street it was very responsive

In next few weeks I should have the setup finished, even if it gets couple hundred rpm lag with .96 undivided i will still be happy, I am also working on a setup with twin pte6262cea turbos :)

I plan on boosting to 30psi once I get fuel sorted out. At 18psi I made 450whp on a mustang dyno. I got full boost at 4200rpm, I'm also using preturbo injection which supposedly slows down spool up. I should be back on the dyno at the end of February to go for 30psi.

Impressive! Keep us updated on the new numbers at 30psi :icon_tup:

Is it just me, or does 450whp at 18psi seems kinda low for a 6766?

Different dynos read different numbers, from what I've heard mustang dynos read low compared to others. I have not gone down the quarter to state trap speeds or time, but I will say I played around against my friend's 600whp supra and we were dead even from 60-150...that was with me starting in third instead of second. The car roasts my 285s bf Goodrich kds at 60mph.

The ones I have dynoed( just tuning, not an in house build) have made similar numbers. My experience shows zero reason to run the 6766 below 22/23psi. One is much better off with a 6266 or similar size below those boost pressures. Better response, same power levels, and with a lot less cost...

Dont want to thread jack but I just have a quick question. I have been wanting to try this turbo but havent found a local buyer for my old setup. Other than the billet wheel on the Pte does anyone know what the difference between A-spec 500r turbo and the 6766 CEA BB is? As far as my knowledge goes they are both 67mm turbos. Thanks guys.

Sean from Aspec will tell you. I was under the impression that Aspec wasnt making the 500r anymore, due to Precision's robust options.