Hi guys, we just completed some testing on a 20G-6 and our Gruppe-S manifold. We selected this manifold as we feel it is a good match for the 20G-6 turbo, specifically the 10.5 hotside and the TD05-R wheel as it tries to spin up the much larger TD06-20G compressor wheel.

The results were pleasantly surprising, substantial gains in the midrange and a slight top end increase. We did not anticipate seeing such gains with a manifold, as we have never seen substantial gains with a manifold on the stock 16G. Perhaps the increase is due to the fact that the larger 20G turbo with its severly clipped turbine wheel needs all the exhaust energy it can get. The shorter runners also probably helped the increase in midrange while maintaining top end power.

Regardless, 302whp pump gas in 100 degree temperatures on our dyno is virtually unheard of for 16G or even 20G’s. I think with an EBC we could have made more top end power. The installation of the manifold caused the boost pressure to drop slightly, so we dialed it back up. AFR’s remained the same. 9whp, 16 ft/lbs. Not bad!

Test car:

*2003 EVO GSR
*Helix 272 cams
*Helix cam gears
*Helix TBE (catless)
*20G-6 Turbo
*Gruppe-S Manifold
*Stock 02 Housing
*Stock intake
*MBC
*Gruppe-S Re-Flash
*1.55 BAR
*91 Octane Pump Gas

We'll be doing further testing on race gas and with another turbo. I'll keep everyone updated. The header is a prototype and is not for sale yet. Thanks!

Gary
Gruppe-S

 

Ok a couple things I have questions on.

1. Why does the dyno only go to 6k RPMs?

2. The manifold looks like a GT Spec what is the difference from this one to the GT spec. Or is it a knock off?

 

good questions. So is it prototype or not ??


here's pix of the GT Spec mannifold

 

the GTspec manifold has the exhaust passages for antilag whereas the prototype does not...did anyone see that besides me?? perhaps it is going to be the Helix manifold??

 

they look the same to me, what is the cost difference?

 

GT Spec is available with or without the ports. Those have no effect on performance.

Different pic of the GT spec piece

 

the gruppe-s doesnt have the anti-lag ports??

 

so real question is, how can some one claim something is prototype when it's either a copy or the same manufacture as the other one.

 

Dadi, no it doesn't, but we don't need them or use them, so it's irrelevant.

 

So what is going to be the base price on these?

 

exactly what he said

 

Maybe I misunderstood what you wrote but am I reading this right?

9whp from a turbo manifold AND the 20g-6?!

 

Considering the curves have the same shape and spoolup is pretty late, I'd say they just added the manifold to an existing 20g-9-6.

 

Hi,

The dyno was only set to 6300 RPM. We can push it out later, but we're just running tests right now. Our real goal is to test a prototype turbocharger.

The manifold might be the same factory as GT-Spec, but we had the runner diameters enlarged and some other minor changes. You guys got to remember the EVO's are sold worldwide. Like the S13/S14 headers there's like 10+ factories making them. So a lot of times we get samples that are manufactured by same factories as some of the Japanese tuners.

The pricing should be ~$399.

Gains were made on the manifold only, the 20G was already on the car.

Thanks!

Gary
Gruppe-S

 

these manifolds also look like the HKS manifold for the stock turbo.