7665 or 7675 Turbo for my build?
Thread Starter
TECH Fanatic
Joined: Jul 2006
Posts: 1,179
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From: North Bay, Ontario
7665 or 7675 Turbo for my build? Hey guys,
Need some advice.
Building a fun street car. The car will not see the track and what I am looking for is a nasty fun quick spool on street tires. Looking for 550+ WHP
- 1969 Chevelle
- Stock 5.3 with LS9 Headgaskets
- Tick Turbo Stage 2 Cam (219/223 | .617"/.595" | LSA114+3)
- T56
Which turbo do you reccomend for me?
I was looking at the On3 Ceramic Ball Bearing 7665 turbo but also started doing some research on the PT7675 turbo.
Not sure whats going to be better for me
Need some advice.
Building a fun street car. The car will not see the track and what I am looking for is a nasty fun quick spool on street tires. Looking for 550+ WHP
- 1969 Chevelle
- Stock 5.3 with LS9 Headgaskets
- Tick Turbo Stage 2 Cam (219/223 | .617"/.595" | LSA114+3)
- T56
Which turbo do you reccomend for me?
I was looking at the On3 Ceramic Ball Bearing 7665 turbo but also started doing some research on the PT7675 turbo.
Not sure whats going to be better for me
This will be absolute heresy on this forum, but I would suggest stepping down to a 67mm compressor and the same or smaller turbine. You probably won't get it much past the 550rwhp you speak of, but spool times would be fun, to say the least. Something like a 7675 would take you far beyond the power you are asking for at the expense of longer spool time. For race cars, and especially the high stalled autos that most are running down the 1/4 strip in this forum, I would be giving exactly the opposite advice.
This will be absolute heresy on this forum, but I would suggest stepping down to a 67mm compressor and the same or smaller turbine. You probably won't get it much past the 550rwhp you speak of, but spool times would be fun, to say the least. Something like a 7675 would take you far beyond the power you are asking for at the expense of longer spool time. For race cars, and especially the high stalled autos that most are running down the 1/4 strip in this forum, I would be giving exactly the opposite advice.
I remember recently reading a thread about the 7665 turbo and the general consensus was that it's the most stupid turbo ever made. Horrible combination of compressor/turbine. The 7675 is very close to my borg 475 and it spools quickly. And that's with a 1.25 AR housing. I'd go 7675 out of the two you mentioned.
I ran precision 67mm when I had my RX7. The turbo spooled really fast and made the power. We made 659hp /680tq on a dyno dynamics at 15lbs. The turbo was plenty for the street and still had a little room left in it.
Thread Starter
TECH Fanatic
Joined: Jul 2006
Posts: 1,179
Likes: 0
From: North Bay, Ontario
I am torn on what to do. On3 did suggest a 6765 turbo for me as well as mentioned by gametech but I am still torn. So many options and opinions.
Has anyone else run a 6765 on a 5.3 ?
Has anyone else run a 6765 on a 5.3 ?
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Verdad Gallardo My son has a 5.3 with a smaller cam than that (Z06) with a BW S475 T6..Yes T6 and it spools fast and it is on low boost right now...We didnt even turn it up yet. I guess it depends what your goals are and my gt45 68mm was a slower spool than my kids bigger turbo. Stated goals are one thing but run low boost and you can always bump it up when you get bored with your original stated goal.
My son has a 5.3 with a smaller cam than that (Z06) with a BW S475 T6..Yes T6 and it spools fast and it is on low boost right now...We didnt even turn it up yet. I guess it depends what your goals are and my gt45 68mm was a slower spool than my kids bigger turbo. Stated goals are one thing but run low boost and you can always bump it up when you get bored with your original stated goal.
FWIW, I have a "little" BW S366 on a 5.3 in my 69 c10 and on 9lbs, It's a blast to drive! Near instant spool and I'd guess around 500hp but I think it still has legs. All stock 03 5.3 motor with only an Isky 215/215 112 cam n BTR springs.
I was paying more attention to the t56 in the OP's post, and less attention to the 69 chevelle. I didn't even consider one of the Borg turbos as a street only recommendation, simply because I usually consider packaging, and that big turbine has to fit somewhere. That being said, an s475 would be way overkill, but one of its smaller brothers might be a good consideration.
Problem is there is many turbos that can fill his needs but once you get a taste of turbos..you just want more. Im just putting that out on the table for him.We have 2 68 chevelles that is why im posting on this thread.Granted the 475 is a big boy in size and fun to install without cutting the car up. Here is my kids car..I call him a kid still..he is 34 married with children just to give OP a idea what a BW 475 in a chevelle fits.
Seriously, though, your s366 idea sounds like just the thing for the OP. Lol Lonely and how much is a 366 vs a 475? The 366 can produce some power but then again it all depends on the op wallet too. That is where the truth comes out !! Lol
We'll see just what kinda power it's making in a few weeks but it sounds amazing! lol Probably the coolest whistle of any turbo I've ran. They are pretty close to the same money if you get a T6 S475. The T4's run a couple hundred more.
My T-7875 seems to spool as fast as my TC78-68. If you really think you won't ever want more then 550 hp then go with what spools fast, but like always we end up wanting more power lol.
