Gtx3582 Or Gtx3576 On A G6Et

[JETURBO]

Yes done it a few times and option the 0.7 cover for additional legs uptop

 

lag difference is minimal but mid/top end is amazing for the cost over a GTX supercore 

 

A GT3582 with a 0.7 cover on a Typical modded Barra has the ability to flow around 430rwkw on 98 and 450rwkw on E85 all up around 20psi 

 

heres one I prepaired earlier but had to limit power generation due to fuel pump limitations on this particular vehicle, overlay with a standard GT3576 ( FG small turbo ) 

 

I’ve circled in green the lag difference against  the roller with WOT and you can tell it’s minimal for a very short time

 

You do need to drill and tap thefront cover for a reference port and you’ll needa new actuator bracket, ported rear housing and typically an adjustable Actuator and rod then assembly which isn’t too horrific but this definitely fills a gap in the turbo market   And at lower than GTX costs  

 

 

[Slowxr6t]

Thanks very much jeturbo, that is awesome Info, really helpful!! Why do you think the kws and torque meet and are the same at 140kph? I thought the 3582 would out power it all the way once it got spinning. How does the 3582 feel on the road in comparison with the stocker? From a standstill and open road? Thanks for the great info.

[Puffwagon]

You can see that they are running different boost levels. If the small turbo was wound up more at the start it would have shown the same or better gains down low. Jet did mention that he had to limit power generation with the bigger turbo, as he was out of pump. If he had more fuel/supporting mods you would see the gains that you think are missing. This particular car should have been properly modified to support the turbo before it was tuned but oh well.

 

Jeturbo is saying a similar thing to me in regard to turbo mods, in the fact that the cost to performance benefit is much better with a modded turbo compared to a gtx variant.

 

The main takeaway from our last conversation was that there are other restrictions to take care of before a turbo upgrade and that some extra mods should be done to support the different compressor. Of course there is nothing stopping you from doing things in a different order and still making gains.

 

Here's the old saying, a poor man pays twice. Do it right the first time to avoid costly retuning.

 

Anyway it's just my opinion and for all we know I'm just a puffwagon.

[Slowxr6t]

I agree  100% puff, but it looks to me like they running same boost but blue line slower to peak then fell over.

[Puffwagon]

They run the same peak boost, but the blue line aka the small turbo, could have come on earlier than the larger turbo (obviously) and made up that big mid range gap. It could well be a better pick at this particular boost level for a daily driver. If I had to guess, Jet didn't tune it the first time with the small turbo as there is no reason for that gap to be there.

 

Not taking away from what jet said cos I agree, but to help you or other reading this understand the puzzle that is car modding, I've included a few more details.

[JETURBO]

Turbo selection is critical to a multitude of parameters within a modified vehicle and this turbo wasn’t just chosen out of a direct comparison but a necessity due to a failed turbo and this was a great bargain for what the customer wanted. 

 

Something to concider is the fact a stock standard GT3576 ( FG small turbo ) can only create a maximum amount of boost for a very short period of time and has a massive “sea saw” effect. Smash it in early and have literally nothing at the end or select a modest target and try and maintain for as long as possible across the RPM range. The harder it comes in the harder it’s out and the power and torque curve can really come over on itself to the point in where you just wouldn’t spin it past 4000rpm 

 

Bigger frame turbochargers can maintain a higher boost level to Redline and in such we can keep more stable IAT’s,Load points,Timing scales and a Broader Torque generation but the offset is initial spool rates ( lag ) 

 

Boost targets aren’t something we just pick out of thin air ( Pun lol ) but something selected over the tuning process in conjunction with the hardware fitted to a vehicle and eclipsing maximum efficiency on all aspects of a modified vehicle. 

 

This ute was fuel limited but also Clutch limited ( factory clutch ) it’s nice to just pluck magical numbers out and or have a “Fully built” vehicle to work with but the fact is something is always the weakest link and needs to be allowed for in the tuning process...... This turbo with a bigger pump and now already has a new clutch it could lay down 20psi from the soonest it could make it, hold it till redline and I’m then still going to be fighting climbing IAT’s due to the entry level 700hp Plazmaman intercooler kit. 

 

Sometimes a modification can be selected “just because”, budget , sounds, and then the correct application for the job and this isn’t always easy to achieve with customers so we/I as a tuner will always try and deliver the best a platform can do and if that means not every single part of the graph has gains that’s just the way it has to be in the relm of tuning “safely” 

 

cheers 

[Puffwagon]

Lol and that's just scratching the surface. 

[Puffwagon]

16 minutes ago, JETURBO said:

the fact is something is always the weakest link

This is spot on and imo these should be eliminated as a priority.

 

18 minutes ago, JETURBO said:

this turbo wasn’t just chosen out of a direct comparison but a necessity due to a failed turbo

Aaaaannnnndddd there's a reason why you should skin your cat differently in different situations..

[JETURBO]

In a perfect world we would but customers have budgets and wacky ideas

 

The tuner has to deal with some crazy crap sometimes and that’s just the life of tuning customer vehicles 

 

#canonlypisswiththedickyougot 

[Puffwagon]

Well at least you give them what they want mate and send them out in a safe and repeatable state.

 

#customerservice