Would the stock manifold and turbo be best for a turbo NA? If so what would i need to do with the wastegate to not overboost? I've heard that with full exhaust and intkake on a TII that the stock wastegate will let the boost creep to at least 10psi. I don' want to runb more than 6-8 everyday. Will porting the stock wastegate be enough to keep the boost low?

 

searchie searchie

 

I have searched alot, if you can't help then please don't tell me to search

 

if you are asking if you should use the stock (i asume tII) manifold and turbo on your na, then you haven't searched enough to realize that the manifold wont work. you'll have to build a custom manifold for your sixport block. aaron cake has a turbo six port, pm him. and an na is much higher compression, and comparing to a tII about how much psi will be created is not going to give you an acurate idea at all. every one says this and after reaserching myself, i believe it too-if you want a turbo rx7, buy a turbo rx7. it is the easiest, cheapest way. sorry i didn't mean to offend you before

 

You should be fine with 10psi limit on an n/a. If your fuel mods are correctly done, the slightly higher CR is not going to affect reliability.

 

you should be fine with 10psi limit on an n/a anyway. With proper fuel mods, the slight increase in CR will not affect reliability.

 

Agreed, the higher compression ratio is not going to be a big problem, as long as the car is tuned right. It will actually have a better low-mid response.

Stock T2 exhaust manifold should work, since they both are 13B.

 

Obviosly you all haven't searched enough, Arron Cake Used a stock TII manifold with a 2.5 inch spacer to make it clear the LIM as most people who have turbo'd a six port do. I know what I am doing and the higher compression ratio is really not as big of a problem as everyone makes it, it will work fine if it is tuned right. My question is refering to using a Stock manifold with spacer, or a aftermarket or modified one using a different turbo and wastegate set-up that might controll the boost better to keep it from creeping since the higher compression will spool the turbo faster. So please if you can help with that question do, but until you've searched please don't tell me to do so.

 

well, with the 2.5" spacer and a s4 turbo + s4 manifold you can cut a hole in the frame for the wastegate actuator or reposition it. With a s5 turbo + s5 manifold you need to "modify" a knotch into the frame for the exhaust housing to clear and a notch for the wastegate actuaor or again reposition it. I have had both turbos on my car and the s4 is definitely easier to fit. I am not sure about aftermarket manifolds but they seem to move the turbo up and forward more? I have had no experience with this sorry. Also right now I am running a s5 hybrid turbo with upgraded compressor and I had to cut away at the acv passage on the lower intake manifold and block off the emissions passages in the lower manifold to make it fit. Good luck on your project.

 

i thought that the boost creep was created by a under bored wastegate .. .. i would think that if your going to run low psi i would opt for the stock t2 manifold with the spacer.. if everything is installed right and properly tuned . boost controlers and such you should be fine with that

 

It's been said that the wastegates can be fit if you mount it afterwards, it works on the s5 at least (what I'm running at the moment) I'm hitting 12psi without a hitch, but I've got a wideband & more than enough fuel to manage it. The s4 is the easier of the two turbo's to fit, ot doesn't require modifying the frame. You can just mount the wastegate actuator in a different location as well. Pretty much, if you have to ask simple questions, you shouldn't do this. It's not hard to do, but it's definatly not for someone who is new to the car and doesn't really know much about turbo vehicles to begin with.

 

A boost controller doesn't lower boost. Only raises. Creep happens when the wastegate can't vent the air fast enough, and inevetably it spools the turbo further. The only solution to this is to enlarge the wastegate so that it can vent more air. However, on my car, I'm creeping about 2psi in 4th gear at WOT, from 10 in 1st-3rd to 12 in 4th.

 

I don't think that its really a simple question like you said you are running 10-12 pounds i want like 8 can i port the stock wastegate enough for that?
believe me when i say i know what i am doing and i also have some very experience people working with me.

 

www.aaroncake.net

 

Here's what you do if you're that concerned. Get this manifold that will fit 86-91 rx7 turbos http://cgi.ebay.com/ebaymotors/ws/eB...category=33742

Since it will fit them, then it will bolt to the block of your car, fitting it in however, I dunno, that's for you to figure out. If you run that manifold you can now fit bigger wastegates. "35mm, 38mm, 40mm (2) Bolt
or
40mm, 46mm , 50mm (4) Bolt"

 

I wasn't impying that you didn't, I was just stating in general since a lot of n00bz read threads like these. Yes, if you port it, it will be good.

 

thanks sonicrat

 

This is hilarious. There is probably more info on turbocharging an NA then there is for any other subject on this forum, and people STILL don't have a clue.

To the original poster, the BEST manifold would be one that is custom made to solve the clearance problems when using a the stock manifold. That way you don't need to deal with wastegate stupidness or spacers.

 

Well I've considered that but really don't feel like going through that. What I am more interested in is wether or not a ported stock wastegate will be able to keep my boost as low as 6-8 pounds

 

So I'm a newbie. Why would you not get a series four turbo lower INTAKE manifold and match it up to the intake ports on the engine.......then use the series four exaust manifold and tubo with no alteration?

It seems to me all you'd have to do is take the lower intake manifold gasket.....lay it on the turbo lower intake manifold and scribe the outline. Then have a go with a dremel motor rotary file.

Yeah.

 

Depends on how big you port it. If you can get your thumb in there and wiggle it around, and you have a bigger flapper, it'll hold lower boost easy.

-Joe

 

This is what I'm going to be merging to in the near future, as I've got too many problems with exhaust leaks from the spacer. Might as well stick an entire tII engine in it at this rate though!

 

Would the series four turbo LIM match up with the s4 n/a UIM?

And why use an s4 turbo/manifold, I thought the s5 was better?

Could you put in the s5 turbo/manifold, s5 turbo LIM, and still have it match up with the s4 n/a UIM? If not, would the s4 turbo/manifold and s4 turbo LIM even match up properly with the s4 n/a UIM? Hmmm, I know you wouldn't be able to make the turbo UIM fit since it's oriented differently, but because of the way the n/a TB and UIM are set up it's just questionable whether or not everything will line up properly, unless someone's already tried this and knows?


Sonicrat, are you really getting that bad of exhaust leaks? Any ideas why?

 

OK, guys, all this manifold stuff has been covered before.

Absolutely not.

I used it because it was available.

Nope.

Nope.

TII lower intake manifold will bolt to the 6 port block if you port match it. You can then use the TII upper intake as well as top mounted intercooler.

Flanges probably warped while welding....

 

I have a lower, upper and a throttle body off a turboii.......so I don't have to worry about a na upper matching a turbo lower. Ya all might, I don't. So I'm saying/asking, why not just get a rotary file and match the lower intake gasket to the lower turboii manifold...and match them as best is possible. Then just bolt on the turboii lower intake manifold, upper intake and throttle body and be done with it.

Yes, I see where using all na intake stuff is harder.