Hello, I'm have a greddy turbo kit and interceptor, and the turbo is starting to go out, I have an oil line restrictor, it helped but i think the turbo is on the way out. I am thinking of upgrading the turbo, possible going to a gt35r or t-4 60-1, I am going to mount it up top. I am thinking of building a custom manifold. I had this idea that I could use the greddy manifold and buy a flange, weld a pipe up to the location that i want to mount the other turbo, and weld another flange to it that would accomidate the new turbo, and build intake piping. My question, in your opinion would it be better just to build a new manifold? I am just worried that the modified greddy manifold may be to restrictive the the larger turbos. thanks for any input

Jesse

 

How many miles do you have on your turbo? Is your turbo smoking?

 

The idea will work. Is it optimal? Nope. You'd be surprised what you can get away with when it comes to turbos. Build it. Try it. See what happens. I've learned a lot from trying different things.

 

I'd use your old OEM manifold to build something up.
That way, if you don't like it, you can always get a new turbo for the GReddy manifold and install it without too much fuss.
The GReddy manifold is cast, so choping and welding it will be a chore.

 

Hey mazdamaniac, I dont plan on cutting the manifold at all, but taking a t25 flange and gasket, welding it to some pipe with a t-4 flange on the other end of the pipe, just making an extention. Hey terrence, I bought the kit used, I dont know exactly how many miles I put at least 20k on it. it mostly smokes at idle, but it is getting worse, I put an oil line restrictor in the oil line it was a .055 nitrous nozzle like the oil restrictor thread, it does not smoke all the time. I do want to upgrade to a bigger turbo and place it up top so its easier to get too. Using the manifold I plan on just taking the turbo off, bolting up my pipe with the two flanges, running my oil and cooling lines depending the on the turbo I choose, make a downpipe, then make new piping to the existing intercooler the other side of the intercooler I will not have to mess with, I am going to use mandrel bent piping. Worse case it doesn't work well and i'll have to build a manifold. RotaryGod thanks for the support! I too have learned many lessons, I have had all generations of Rx-7's and probably had changed an engine in each of them, even my 8! I was stupid before and with the emanage blue and tried to run more boost than I should have, the air/fuel ratios were good, but i could not pull timing, I had a boost spike, and it detonated hard, but still ran, then gave out later, I had about 60k on it. I should have bought the interceptor in the first place, its running wonderful now and fast, but I think i want a more than the greddy can handle. Engine number 3 .....maybe, but it will be fun. So I guess I am going to start to collect parts, anyone know the best place to get a gt35r? im thinking the rx7store. Also wheres the best place to get piping? I found flanges and things at turbonecticsinc.com and xsengineering, if you know any place better let me know.
Thanks,
Jesse

 

Can the gt35r bolt right up to the greddy manifold?

 

no

 

The manifold flange is different, and even if it was the same I doubt you could squeeze it in there without a really BFH. :D

 

I was thinking about the coolant lines on the gt35r , what is the best place to run the the lines from and to?

 

Pull the lines that go to the throttle body.

 

This is where I got my tubing:
http://www.globaltecheng.com/products.htm
Hope it helps.
Also on ebay, if you do a search, you can get turbo kits with 90 and 45 elbows and couplers for real cheap. I am talking a fraction of retail prices.

 

Do you think the GT35R might be a bit too big & laggy for the 8?

 

Thanks MazdaManiac, and RotorRocks,
I think the GT35R Will spool up quick enough for its size., I am hoping full boost by about 4k rpm, The greddy spools almost instantly and is nice down low but not as strong up top. When I am really on the boost, I am mostly over 4k rpm anyway. I'm sure in the higher gears it will start to spool sooner than that.

 

gt35r works great on engines that have similar breathing to the Renesis. Its known to spool very quickly. Its a great choice for the 8. I think its probably the best choice given the efficiencies at which it will be operating.

 

I'm not sure I want to give up anything in the 3k-4k range, want an easy install, & am trying to control costs. So far I'm leaning towards a GT3071 versus the GT35r for those reasons, but can be convinced otherwise!

 

Well, cost is certainly a factor. The GT35R is just a lot more efficient of a turbo. Depending on your ambient pressure, which I gather from your location is probably close to 14.7 psi, the GT30 will run out of flow in the higher RPM if you run boost over 12 psi. The GT35R has much more flow capability.

This might not be a factor for you, but since my ambient pressure is less than 12psi, it is a very important factor for me! The better flow, efficiency and the fact that its a ball bearing turbo (which likely means better spooling than the GT30) just makes the GT35R a much better choice - cost excluded.

 

3071 is ball-bearing too http://www.turbobygarrett.com/turbob...R_700382_3.htm

I won't ever be able to do >12 psi here in CA, land of the crappy gas, unless I mix a bunch of race gas. GT35r sounds like a good choice for you though.

 

I went with the GT3076R with the .82 exhaust housing and have been very happy with it. I was also able to mount it in the same location as the Greddy turbo.
http://www.turbobygarrett.com/turbob..._700382_12.htm

 

I've seen the GT35R make boost @ 3200rpm with a stock cat and exhaust. Full boost comes on pretty fast after that.