Hey guys, just going through all the initial sort of research about creating a Tarmac race car based upon a RA. Now there are a couple on my105 but looking through the restrictions for improved production, to run a turbo I have to convert the turbo intake to a restricted diameter. If memory serves (on phone) it's has to go down to a 36mm from a 42mm?? one.

Has anyone ever had to deal with restrictors before and how much does it have to get de tuned to run properly?

Sorry heaps of questions but there will be alot more of the course of the next year...

But now, decisions have to be made about whether or not a NA will be better.


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Wide Body GC8 WRX
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PM Doug aka Dtrally he should be able to him or Brendon urabus on here both are heavily into tarmac/gravel and both have GC rally cars. Or did in Brendons case.

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Yeah have emailed Brendan but felt bad to keep annoying him. Thanks for the input.


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Wide Body GC8 WRX
#217 Street Cars WA
Full 04 STi drivetrain
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Garrett 3076 xtr

I know when i bought my VF34 from Dave he was talking about how it previously had a reducer fitted to it, and i'm certain he said it had a 36mm. Sure he'll be along to reply soon

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It is not so much detuning the car, more changing the mapping to suit the characteristics of the turbo with restrictor fitted.
I was speaking to one of Toshi Arai's technicians and he said Toshi's car was making almost 50kg/m of torque, that almost 500nm if I'm not mistaken.
With a 32mm group N restrictor.

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It costs no more to tune a car with a restrictor than without. The restrictor in the subaru means the thing just wont rev. From memory the lights go out at about 5500 rpm.

Best bet is to go up to Race Torque when you get a chance and talk to Dave or Lane. Ledgers IPRA national championship car is basically a permanent fixture there. Lane will be able to tell you give or take how much power etc it makes.

I think the restrictor in that class works well. It takes away any incentive to run big turbos because you just cant get enough air into it.

Brendon

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Thanks Brendan.


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Wide Body GC8 WRX
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Garrett 3076 xtr

The restrictor goes on the inlet side of the turbo within 50mm of the blades. Depending on the model of GC8 (and turbo) you chose, will depend on how the restrictor is fitted.
The TD turbos require a bit more work to fit the restrictor than the VF's.
It's not an overly complicated job on either turbo and the standard hoses can be reconnected once the restrictor is in place.
You can run a standard ECU with a restrictor and the car will run fine, it just won't produce as much power. Many people are running the standard ECU with a 34mm restrictor in gravel rallying at the moment. It's a cheaper way to get started.

The best method however is to use an aftermarket ECU/chip that can be mapped to gain the best power and torque available with the restrictor in place.

Restrictors were imposed (at least for rallying) after the spectacular and highly dangerous Group B era in the WRC. It took a couple of years before the replacement Group A cars started to have rising power outputs. In an effort to stop Group A cars reaching the outputs of Group B, the FIA introduced inlet air restrictors for forced induction cars.
After many years CAMS has recently allowed a change in Australian Rallying to remove restrictors from turbo cars competing at national level (ARC).

Not sure on the race front, I'd say the restrictor is in place to keep some form of parity amongst the turbo cars.

Karl

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What tarmac events require a restrictor?

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Not a straight forward answer to this Q.

Most tarmac events do not require a restrictor eg: Sprint series, hill climbs, Autokhanas, Rally sprints at Motorplex etc.

Certain race classes at Wanneroo require a 36mm restrictor to be fitted.

Tarmac rally is more complicated. If the car is built/log booked with a restrictor, the restrictor needs to be fitted for Targa type events. If the car is built/log booked without a restrictor it doesn't need to be fitted for Targa events.
IE: If you have a gravel car and decide to do Targa West, then you have to run the restrictor and compete against unrestricted cars.
At least that's how the CAMS rules were applied last time I looked at tarmac rally.
If they rules have changed, someone please correct me.

I won't get on my soap box about the disparity in the rules, there's so many it's not funny.

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