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molch

G6E Turbo replacement????

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Yeah I was wondering how long the engine will survive at these boost levels?

 

Also Jet, any suggestions to bring boost levels back and controllable?

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There's no getting around a mechanical overboost issue except a 4000rpm limiter hahahahaha 

 

honestly it needs a suitable port and flap job done on the turbocharger rear housing, then an adequate actuator and preload setting then bobs your uncle 

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the tuner did all 3 of these as they recommended it would be needed after the initial run.  They did say they had never seen this type of turbo. 

 

Am I now screwed because I tried a Mamba turbo. 

 

What ither mechanical methods can be tried? 

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If your tuner can't maintain lower than 24psi of boost with a 38mm flap you obviously have greater flow than expected and need to jump to the monster port 40mm flap/port combo 

 

this is the problem with a new type of turbo or any hardware in fact as you do become the test pig

Edited by JETURBO

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I had a good look at the Mamba site earlier. Surprising they supply it with such a small waste gate port. Considering the front wheel should flow more than a GTX3582 you'd think a bigger waste gate port would be the first thing they do.

Good on ya for doing the hard work for us@molch, never fun being the test dummy lol.

Also if anyone else is interested Mamba do have the GTX3584 CHRA with a 4" .7 comp cover available on their website, http://shop.mambatek.com/GTX3584R-Tubo-CHRA-w-4-Anti-Surge-A-R-70-Comp-Housing-038-0076.htm




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I'd seriously email them and let them know the issues you've got with over boosting 

 

for a while I could have sworn they sold one with a larger flap

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Hah Yep I saw there was a lot of love for the Nizpro over boost valves! 

 

Hmm now I'm off to rob a bank! 

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Jokes on me tonight guys. :surrenderwave:

 

Does anyone know others that have have turbo that is gtx rear and t40z compressor? Would Be awesome to find someone.

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Monsters torque have been doing it for years,

 

race equipped and and jim gianna stage 3 is the same thing as well

 

email mamba asap is the best bet

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16 minutes ago, MattyP said:

Monsters torque have been doing it for years,

 

race equipped and and jim gianna stage 3 is the same thing as well

 

email mamba asap is the best bet

 

Cheers, I emailed them today and have just flicked them an update. I'll let you know how I go getting a response to either.

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Yeh just melt the valve head straight off the stem from 11TY billion degrees of temperature 

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wastegate

port job

dump pipe

blowoff

flapper

 

c'mon guys - there's heaps more material to work with

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Glad I could give you all a chuckle. Thought I put an update in. I data logged the car using a cheap UBD11 wifi + iphone app and its not spiking just building alot of boost.  10 psi by 2600, 15psi by 2900 , 22psi by 4200rpm. 

 

I get it that its much higher boost then stock internals were built for but I trust my tuner and so long as there is no detonation it should be ok yeah? He took out timing and added fuel to ensure it was as safe as possible. I have since read about Tonyv's F6's 25psi boost on stock internals and a few other examples of high boost on stock internals so I'm not longer freaking out like the night you guys all had a good chuckle over the results.

 

I am however abit worried about summer coming and what adding ambient air temp to the equation will do so I'm going down to chat to the tuner one afternoon this week about my options moving forward.

 

The turbo supplier hasn't returned either of my two emails. I did call 999automotive in qld/syd who locally supply these turbo's. They were helpful and they have fit them to 3 or so xr6 turbo's and got boost as low as standard with a 5psi spring in the actuator.

 

This made me do some research on the turbo and understand compressor maps better.

 

 

gtx 3GTX3582R_comp1.JPG

 

t04z_comp_e.jpg

 

Now my T04Z has a 11 blade billet wheel which for what Ive found is not how garrett supply them. I cant find any maps for my exact kind of wheel. But what this shows me is the T04z produces boost at a much lower compressor RPM then the gtx3582r and the GT3576 that was originally on the car.

 

The t04z at 24psi and 660ish FWHP is spinning at 105,000RPM

The GTX3582R at roughly the same is just over 110,000RPM

 

If you follow the gtx3582 map down to 105krpm I would be around the 18psi mark. Also if you do the same on the gtx3576 map it is even lower at around 15psi for the same RPM but much lower power obviously.

 

My current thoughts are that the Mamba exhaust housing are not a good fit for the t04z with a free flowing system (I.e stock system would limit exhuast flow) unless you modify the wastegate and flapper and want a high boost application, how big I cant say yet but 38mm will get you 24 psi.  I would go as far to say they are no good for a gtx3582r with free flow exhaust unless you modified it with a 38mm wastegate port and flapper.

 

Anyway I'll drop in an update after I get my options thought out and have a plan about next steps.

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