Mechanical_Deviant

Im planning my new engine, and I am reshearching turbos. I love the feel of the sequentials. I am the kinda guy who likes the cars that have inmese power all the way throught the power band. Im going to rebuild my old engine, I have an jspec imort in ther for now. The new motor will have a port, not sure what yet because i havent chosen turbos. It will have 3mm apex seals, renisis e-shaft. The motor will also get ITB's with a plenume, not sure how big cause i havent chose turbos yet. I will probly use an Autronic standalone, maybe a Haltech. I want to build a new twin turbo setup, parallel. I talked to a guy I met in a bar at the grand prix. He worked for garrett, and designed turbos. I told him that I run the canyons, road race, and am interested in drifting. I want at least 400hp, he told me to go with the gt28's. So here are the two turbos I am looking at. The first is a gt2871r, the other is the gt2876r. Garrett recommends the gt2871r's for a twin setup capable of making 800hp, with suposedly very little lag. I will tig up my own stainless steel manifold. What I want to know is, has anyone used these turbos? What are they like? Do they have excessive heat build up? What are your thoughts?

here is the link to garretts page

http://www.turbobygarrett.com/turbob...ison_sheet.htm

RETed

Are you for real???


-Ted

Mechanical_Deviant

What do you mean am I for real? Did I ask a stupid question? I asked it here because I have heard of people using to gt28's of various hybrid sizes with stock FD manifolds set up in parellel. Ive never used or setup any turbos that wern't a stock size, or smaller then a T4.

RETed

While a GT2871R might be able to hit 400hp on a piston motor.
There is no way it'll hit those numbers on a 13B rotary.
So, it is next to impossible they could come close to hitting 800.

You do realize that these things are $1,000+ each?


-Ted

NeedFD

if you're gonna go with those turbos, then you'll have to custom the manifold and downpipe etc.

There are companies out there that make outstanding performance of of the twins setup. some companies are
M2 which no longer exists but their twins setup was awesome
BNR which is still making kits, up to stage 3 right now, ask goodfellas for his setup.
knightsports i had these turbos and they're rated for 400hp

there are other companies that have tried gt28s etc but i'd stick with these companies since they've done a lot of R&D prior to releasing the kit.

Mechanical_Deviant

Nice thats why I posted here I knew someone would have answers. I realize they wont make 800hp, im not trying to get that high. I would like between 4-600, what I want is power through the whole band with very little or no lag. I realize the price of the turbos, but if im gonna spend the money I want to do it right. Ive looked around for that BNR setup, but have yet to find them for sale, do they have a website? I knwo that sounds like a newb statment, but I am used to hand fabricating all my own parts. I have built many manifolds for different setups, ITB's, turbos ect. None of my cars have been to any shop other than to get tires since I purchased them, I do all my own work.

lovintha7

www.bnrturbos.com

Rotarded

I ran twin GT28Rs, in parallel, on a ported motor last summer. The car put down 410rwhp @ 16psi and pulled like a freight train at WOT. The turbos would be spooled to 16psi by 3900 rpms and hit hard. BUT, they were a giant pain in the ***.

The 5 bolt exhaust outlets on each turbo, in an extremely cramped space made for a 5 hour, bloody handed job of installing the downpipe with the motor in the car.

The internal wastegates on the turbos prsent some clearance issues and are virtually impossible to synchronize well enough to eliminate all compressor surge. Though a cross-over between the turbo manifold runners may have been helpful if I didn't just bail on them .

Plumbing the oil and water inlets and outlets required some intensive planning with a mock-up motor and alot of braided hose.

Just some food for thought.

Mechanical_Deviant

Hmmm interesting. Wich 28's were you running? The 76 or the 71, the maximum boost is suposed to be much in the high 20s for the 71. Could you have boosted more? What was the high end like? I have and will have a little more space then you. I dont have all the extras in my motor conpartment, and if go with ITB's I will have a little more room. I had thought of using a cross over tube on my manifold, I was even wondering if i could use external waste gates. I had even thought about making a two peace down pipe. One that bolts to the turbos and one that bolts on lower down and farter back.

Rotarded

I was running the 71s.

I could have easily run 20psi but I had severe traction issues with the 275-35-18 Toyo Proxy T1-S. I almost slammed into a Viper when the back end kicked out once at 60 MPH. Bought 285-35-18 (50 compound) Drag Radials and still would break free when I hit 16psi, but not nearly as bad.

Mechanical_Deviant

I like the sound of that, I wonder what it would take to get the tires to hook up. I could always wide body the rear end and run some 10 or 12 inch rims. I already have 9 inch gen one Advans for the back, ill just have to get bigger ones. Assuming I could get the tires to hook up that might make one hell of a setup. If nothing else it would be a good drift setup. Are there any other suggestion or alternatives you would suggest for the power range I want.