stock turbo is done

[mzrdisiturbo]

just bought the car from a dealer other than mazda on the first of the month with 50k and the turbo is now making a chattering teradactyl noise. (sadbanana) started to do it a little bit and now does it pretty much all the time as soon as it spools the slightest bit. keeps gettin higher pitched as rpms increase but now im limited to stay under 3k at most at all times. kinda pissed right now but im just gonna throw a nice turbo upgrade on her and get down to bidness (drive2)

just felt like ranting. have a nice day!
-Chris

 

[FORZDA 1]

Go here for your turbo....

http://forum.***************/mazdas...ed-3-6-k04-hybrid-turbocharger-330whp-61.html

 

[crlsnlopes]

Go here for your turbo....

http://forum.***************/mazdas...ed-3-6-k04-hybrid-turbocharger-330whp-61.html

thats on my to get list. BNR stage II. have you received your S3 FORDZA.

 

[FORZDA 1]

thats on my to get list. BNR stage II. have you received your S3 FORDZA.

Yes! I have it and the Jet-Hot 2000 coated DNP just about ready for install. I still need new studs for everything and they're on the way.

 

[coyfish]

Don't throw a shiny new turbo on there if your still stock lol. Good way to pop.

 

[djuosnteisn]

Don't throw a shiny new turbo on there if your still stock lol. Good way to pop.

Actually a bigger turbo is probably a safer way to go, as long as the boost is kept in check and the owner doesn't get too greedy for power.

stock turbo is knowingly out of breath in the upper rpms (thus why mazda closed our throttles on us). As you push it further and further outside of it's efficiency zone, it just super heats the air and increases propensity for detonation. Plust there's no extra power in that added boost, and possibly even a loss in power as the efficiency lowered.

big turbo on the other hand, is happy as a clam pushing 20psi all throughout the rpm range on our lil motors. Charged air is kept much cooler, exhaust pressure in the exh mani is lower, reducing reversion effects (which i personally believe account for a fair amount of the carbon build up on our int valves).

Only problem is that any mazdaspeed specific atp turbo is notorious for boost creep, and is best coupled with an external waste gated exh manifold, and the iwg being welded shut.

Or you could go with the reworked turbo forzda posted above , at least i believe it's a reworked, i honestly never really followed that thread lol.



OR, you could go fully custom and shoot for the stars. But it's wise to build the bottom end on this route.

 

[mzrdisiturbo]

my plan is to upgrade to a t3t4 and keep it at the stock boost. and then get a COBB SRI and an accessport. then do something with the exhaust. mainly just freeing up power is as far as im gonna go with performance for right now.

 

[coyfish]

Actually a bigger turbo is probably a safer way to go, as long as the boost is kept in check and the owner doesn't get too greedy for power.

stock turbo is knowingly out of breath in the upper rpms (thus why mazda closed our throttles on us). As you push it further and further outside of it's efficiency zone, it just super heats the air and increases propensity for detonation. Plust there's no extra power in that added boost, and possibly even a loss in power as the efficiency lowered.

big turbo on the other hand, is happy as a clam pushing 20psi all throughout the rpm range on our lil motors. Charged air is kept much cooler, exhaust pressure in the exh mani is lower, reducing reversion effects (which i personally believe account for a fair amount of the carbon build up on our int valves).

Only problem is that any mazdaspeed specific atp turbo is notorious for boost creep, and is best coupled with an external waste gated exh manifold, and the iwg being welded shut.

Or you could go with the reworked turbo forzda posted above , at least i believe it's a reworked, i honestly never really followed that thread lol.



OR, you could go fully custom and shoot for the stars. But it's wise to build the bottom end on this route.

First of all it depends on what turbo the OP is thinking about. Throwing on a bigger turbo like a GT3071R is not smart unless you purchase the associated mods. I mean you could stick that turbo on the car and run 10 psi all day long with more turbo lag / later spool. But might as well get the stock turbo for that. Not to mention its what the car was designed for.


The turbo isn't really the problem with our cars. Its the fueling / tuning.

 

[djuosnteisn]

First of all it depends on what turbo the OP is thinking about. Throwing on a bigger turbo like a GT3071R is not smart unless you purchase the associated mods. I mean you could stick that turbo on the car and run 10 psi all day long with more turbo lag / later spool. But might as well get the stock turbo for that. Not to mention its what the car was designed for.


The turbo isn't really the problem with our cars. Its the fueling / tuning.

I'm glad you mentioned the later spool, cause that was one of the other benefits i forgot to mention lol.

BT later spool is actually a good thing on our motors, or more specifically, our connecting rods. High boost with low rpms puts much much more compressive stress on the connecting rods, esp when that high boost occurs at maximum VE of the motor. I'm not alone when i say it's a good thing to keep the power in the higher rpms, preferably above 3k rpms, and BT's do this for you automatically

Plus the spool on 3071 isn't bad at all. I've been running one for almost a year now, and i love it. I don't usually mash the gas under 3k rpms out of habit, but if i floor it at 3000, it's full boost by 3500~3750.

And granted, spool time has a lot to do with supporting mods, and is where attention to collector design on the exh mani etc etc is important.

I personally don't think fueling is a problem. I dynoed @ ~390 and was still running PIG rich in the higher rpms, where our fuel systems have the least amount of time to inject.

Plus you can always just up the fuel rail pressure . I upped it by roughly 10% and saw a corresponding 10% drop in afr's, so it's a proven way to get more fuel in the motor! Not sure how high you can raise it before the injectors start to have a hard time opening, but IMO we have a ways to go.

 

[coyfish]

I'm glad you mentioned the later spool, cause that was one of the other benefits i forgot to mention lol.

BT later spool is actually a good thing on our motors, or more specifically, our connecting rods. High boost with low rpms puts much much more compressive stress on the connecting rods, esp when that high boost occurs at maximum VE of the motor. I'm not alone when i say it's a good thing to keep the power in the higher rpms, preferably above 3k rpms, and BT's do this for you automatically

Plus the spool on 3071 isn't bad at all. I've been running one for almost a year now, and i love it. I don't usually mash the gas under 3k rpms out of habit, but if i floor it at 3000, it's full boost by 3500~3750.

And granted, spool time has a lot to do with supporting mods, and is where attention to collector design on the exh mani etc etc is important.

I personally don't think fueling is a problem. I dynoed @ ~390 and was still running PIG rich in the higher rpms, where our fuel systems have the least amount of time to inject.

Plus you can always just up the fuel rail pressure . I upped it by roughly 10% and saw a corresponding 10% drop in afr's, so it's a proven way to get more fuel in the motor! Not sure how high you can raise it before the injectors start to have a hard time opening, but IMO we have a ways to go.

390whp with a GT3071R. Sorry but im calling BS there unless the dyno runs 50hp high.

Tuning / fueling is the problem. With an upgraded GT3071r without supporting mods your looking at 4K spool which can get annoying in DD applications. Running a bigger turbo on a stock car is 100% pointless. You will get the negatives of a bigger turbo without the benifits. The stock turbo is fine for 300whp.

Im running 304whp on the stock turbo at 17psi. Running lower boost than I was untuned.

 

[djuosnteisn]

Here's my dyno thread:
http://www.m a z d a s p e e d f o r u m s.org/forum/f338/car-acting-fool-46279/

IMO the 3071 is the RIGHT SIZED turbo for our platform. It's by no means a big turbo relatively speaking, just bigger than our lil k04. I'm an advocate for efficiency, and the k04 does not deliver efficiency anywhere above stock levels (in fact not even at stock levels lol).

If OP wants to just keep the car relatively stock, i'd suggst a 2871 then. That's prob a perfect fit.

 

[coyfish]

Well thats my point. For stock purposes no sense in getting a bigger turbo when your not even pushing the stocker.

Anyway good #'s. Hope you can get your car running properly / safely though.

 

[djuosnteisn]

Thx!
It'll be running quite soon. I've already got a spare motor in mid build and i just sold my ap for a standback v2 and flash combo.

The ap has some SERIOUS limitations in higher hp applications.

Here's a read about it if your interested:

 

[coyfish]

Thx!
It'll be running quite soon. I've already got a spare motor in mid build and i just sold my ap for a standback v2 and flash combo.

The ap has some SERIOUS limitations in higher hp applications.

Here's a read about it if your interested:


I wouldn't know . After my DP ill be done modding save perhaps some new fuel pump internals if needed.

 

[djuosnteisn]

Fuel pump internals are a must. But in that link, you'll see that one guy was completely stock, and still experiencing a load clip in his tune. IMO anyone using the AP should at least do one datalog to verify they aren't in such a situation.

 

[coyfish]

Im getting custom tuned. I have done lots of logs already.