What turbo to put in the RS2?

[newsh]

That still means the engine is mapped to the last cell.

Can you explain what this means?

[Jeffer]

I see in that PDf that they privide hotsides with k26 flanges

[Billman]

I just noticed that apparently the Comp turbo have same turbine diameter all the way or am i wrong? The turbine inducer/exducer is tha same.

[Thuppu]

I don't think so.

[Billman]

I don't think so.

maybe i get this wrong:

The Comp Turbo turbine wheels are a unique design in that they have vanes that are constant in outside diameter from inlet to exit.

See also Page 11 in the PDF mentioned before.

[prj]

Can you explain what this means?

That means in all situations above 350hp it is using the same values for injector pulsewidth and ignition timing for the same rev range.

So, when you go WOT from a certain RPM, your fuel mix is first excessively enrichened, then it leans up. Same with your timing - excessive retard for the conditions at start.
The reason is because after 350hp motronic does not know how much air the engine is ingesting, so it can not know how much fuel to inject accurately. It just uses the same value from the last cell for all the conditions above that power level.
This is not good for your motor...

Of course, 350 to 400hp it's not that bad, but cars above 400hp that use the stock MAF make me cringe.

[Thuppu]

maybe i get this wrong:

The Comp Turbo turbine wheels are a unique design in that they have vanes that are constant in outside diameter from inlet to exit.

See also Page 11 in the PDF mentioned before.

Ok, maybe it's so. Perhaps used on bigger high-power turbos where spooltime is not the deal..?

[newsh]

That means in all situations above 350hp it is using the same values for injector pulsewidth and ignition timing for the same rev range.

So, when you go WOT from a certain RPM, your fuel mix is first excessively enrichened, then it leans up. Same with your timing - excessive retard for the conditions at start.
The reason is because after 350hp motronic does not know how much air the engine is ingesting, so it can not know how much fuel to inject accurately. It just uses the same value from the last cell for all the conditions above that power level.
This is not good for your motor...

Of course, 350 to 400hp it's not that bad, but cars above 400hp that use the stock MAF make me cringe.

Ok thanks.

[turbo20v]

Has any forum members who are selling rs2 chips with more that 350hp any comments on that ?

That means in all situations above 350hp it is using the same values for injector pulsewidth and ignition timing for the same rev range.

So, when you go WOT from a certain RPM, your fuel mix is first excessively enrichened, then it leans up. Same with your timing - excessive retard for the conditions at start.
The reason is because after 350hp motronic does not know how much air the engine is ingesting, so it can not know how much fuel to inject accurately. It just uses the same value from the last cell for all the conditions above that power level.
This is not good for your motor...

Of course, 350 to 400hp it's not that bad, but cars above 400hp that use the stock MAF make me cringe.

[prj]

Has any forum members who are selling rs2 chips with more that 350hp any comments on that ?

People who are selling chips are not qualified to comment.
Only those who make their own software.

People who sell have in 99% of cases no idea what is inside the chips that they sell.
Except of course if they made the software themselves.

[turbo20v]

People who are selling chips are not qualified to comment.
Only those who make their own software.

People who sell have in 99% of cases no idea what is inside the chips that they sell.
Except of course if they made the software themselves.

Perhaps i made wrong questation then..... i was thinking about people who claimed they have developed rs2 chips by themselfs and sells them on this and other forums ....

[Lloyd]

Have you checked your AFR at full boost?

Yes, I had the AFR's checked yesterday.

Torque Developments checked them whilst out on road test following chassis alignment.
Reported to be excellent and bang what they would look for with their own tuning.

Happy Days

[prj]

Yes, I had the AFR's checked yesterday.

Torque Developments checked them whilst out on road test following chassis alignment.
Reported to be excellent and bang what they would look for with their own tuning.

Happy Days

So, do you have a graph? Numbers?

[Lloyd]

Nope, they put in a wideband sensor with a handheld display and monitored it whilst I repeatedly gave it the beans, right through the rev range. Could only get a graph from a dyno run and their hub adapters do not (yet) fit the RS2 hubs.

[prj]

Nope, they put in a wideband sensor with a handheld display and monitored it whilst I repeatedly gave it the beans, right through the rev range. Could only get a graph from a dyno run and their hub adapters do not (yet) fit the RS2 hubs.

Don't need a dynorun to get an AFR graph if you have the correct hardware.
Hell, you can get a graph from a tail-pipe LC1 for example, as long as your exhaust has no leaks.
So basically, this still does not do anything to clarify the situation...

But I can tell you one thing - the K26/K27 cars that I have tuned have all been very close to maxing out 400cc's (95% DC).
440cc's were adequate.
360cc's will be maxed out way before the turbo is. So either you are running lean at high rpm's or simply not making the stated power.

This is just physics.