Samjai

Hi guys,

So I haven't posted in a while since I can't do much to my car with the winter season in the great white north but I wanted to plan something before summer hits!

I wanted to ask for some advice/opinion on a reliable turbo setup for the stock 13b motor.
My motor is currently at 30, 000 original km with no rebuilds and a compression of 7.5.
One of my turbos is currently cracked and leaking oil whenever it spools so I am considering replacing them.
Problem is, i'm not sure if I should stay with stock twins or upgrade to the 99 spec ones or do a after-market set up.

Thanks everyone! I'm looking forward to your opinions!

arghx

iTrader: (3)

What are your goals and what is your budget?

MR_Rick

iTrader: (7)

...and what supporting mods do you have?

Samjai

Sorry I was too vague >< But I wanted to go for something around 350 reliable rwhp. My budget is moderate maybe something like 10 k give or take.

The mods I have so far is:

hks intake(dual cone)
all metal radiator from rx7.com
Bönez 3" Stainless Steel Performance Converter System
Racing Beat Dual Tip Exhaust
Replaced all vacuum lines
Pettit power pulley kit

Mods planned:

Power FC
Pettit coolcharge 3 intercooler
Pettit AST

I'm not sure about the complete list cause I'm still fairly new to modding, any recommendations for supporting mods would be greatly helpful.

Thank you all!

MR_Rick

iTrader: (7)

If you want to make 350 rhp reliable then get you some 1680cc secondary injectors, supra pump and a set of BNRs turbos. That should put you in the ball park of reliable hp.

zeroG

iTrader: (28)

You can get around 350rwhp with the stock turbos. It's more or less the maximum efficiency you can get out of them.

Besides the mods you have planned, the most probable things you'll need are a fuel pump/injector upgrade, and perhaps a straight midpipe. You'll then need a proper tune to get your turbos to operate at 12psi or greater.

There are tons of discussions on supporting mods needed for whatever HP you want, if you search around for them you'll get all the info you want.

MR_Rick

iTrader: (7)

Well the reason why I suggested the BNRs is because he is looking for replacements since his are shot. He was looking at 99 spec but for the same price he can get a set of BNRs and have room to grow. Beside running the BNRs for the give hp goal would be a more efficient that pushing the stockers for 350hp.

Montego

iTrader: (1)

nevermind that stock turbos (even 99) are not rebuildable well at least don't last after they have been rebuilt. So yeah +1 on the BNR's

Supernaut

iTrader: (83)

I agree with the BNR assessment. 99 specs are pretty pricey new and you can make more power with the BNRs. Unless you are dead set on the 99s I would pass.

KKMpunkrock2011

iTrader: (5)

They are, the longevity is hit and miss though. Some people have them last thousands of miles, and some have them break in 500.

I agree with what Suprenat and most other guys are saying. For 350 your best bet is to snag a set of BNRs. If you want a little room to grow then look into a gt35r kit.

zeroG

iTrader: (28)

I agree with all of the above, if you have the budget for it by all means go with BNR's, I advised to go with the stock turbos because it's a lot cheaper and you can still get around your desired power levels.

Samjai

Thanks everyone for all the great feedback!

Right now I am considering the following options:

repairing my cracked turbo
replacing the cracked turbo
upgrading the turbo core with BNR(if they also repair the cracked one )

I wanted to know if anyone has experience with any of these and if they can share their opinions about it. Thanks!

Also, does anyone know a well known place for these? I only know of www.rx7store.net as of now.

I'm also searching around the forums for the supporting mods; theres just so many different set-ups!

Thanks again everyone for your help!

KKMpunkrock2011

iTrader: (5)

http://bnrsupercars.com/

Montego

iTrader: (1)

In my experience they don't last and I've had my share of rebuilt ones, again this is just in my experience of course. I bow to those that have had success with rebuilt ones because I had zero luck with them.

My car came with a warranty and they replaced quite a few turbos, they kept using rebuilt ones They start smoking and I'd go to the dealer and drop it off... get my car rental. By the time I got my car back they had spent about 3K per visit. After the second time I asked them why don't they just spring for new ones and their reply was becasue rebuilt is just as good but if I want I can pony up the difference. My answer to them was "well why would I put up 1K for you to save money in the long run?"

So yeah they broke like 2 more times. After the warranty ran out I had them rebuilt as well by rotary mechanic's (much cheaper) and to no avail. They would break in a just a few thousand miles at most. The most that one lasted was like 4K and to me that's not rebuildable.

Supernaut

iTrader: (83)

Yeah but the stockers wear out much faster above 13 - 14 psi boost no? I can see the pros if you can do all the work yourself and enjoy swapping out turbos but if not, I don't think it is worth it to do so. Those BnRs are pretty freaking awesome, especially considering the money.

There is a group buy for them going on right now. I don't think any new orders are being taken. I'm currently selling a spot but it looks like it may be taken. I can let you know if the guy drops out. Shoot me a PM if you are interested.

thewird

iTrader: (8)

To put a spin on things lol...

Avoid the hassle of twins, go single with a nice little turbo. Get all that crap out of the engine bay. Your looking at fuel, fuel pump, intercooler, injectors and rails, twin power either way.

thewird

MR_Rick

iTrader: (7)

^I agree

Do it right, do it once. GT35R should do.

Samjai

Thanks for the insightful feedback guys! I will try to update with what option I have chosen once the weather clears up

Amberbeer

I have 50k on 99' spec turbos and make the power you are looking for @14 psi. At that level I believe the motor will let go before the turbos. ("in my case" your results may vary) They were recently inspected after Mazda claimed they were toast... I had to have an oil line fabricated and replaced but otherwise was deemed to be quite healthy.

I would still agree with those who suggest going with BNR's or going single. That power level makes for a quick FD but leave me wanting more. Those new 5.0 stangs are fast and relatively cheap. I have too much pride not to have that one in my pocket

I was thinking just like you 5 years ago and wish I had gone single then. I stuck with the twins and for just slightly more I could have had 450 hp single turbo setup. Your goals may be different but give it plenty of thought.

MustangEater

iTrader: (4)

^^ this guy makes a pile of sense, alot of cars out with 400+hp stock

KKMpunkrock2011

iTrader: (5)

but they also either weigh 3500+ or cost 40k+

papsmagu

iTrader: (19)

yes save yourself alot of headaches Go Single

93rx74lyfe

iTrader: (1)

Kind of a side note but is your motor ported? I'm not so sure you will be able to reach 350 on the stockers even at 15psi, maybe with the bnr's but it still may take more than 15.