BT for AAN

**S2central.net** · 7 April 2011, 13:44

Who said a 3071 is too big - what is the application and target power / torque level ?

Stock AAN EX manifold is restrictive compared to RS2 item or more exotic aftermarket specials.

**Jamo** · 7 April 2011, 15:10

Originally posted by S2central.net

Who said a 3071 is too big - what is the application and target power / torque level ?

Stock AAN EX manifold is restrictive compared to RS2 item or more exotic aftermarket specials.

034 told him that

then said get a 2871 on one of their generic maps

How much do you want to spend? HTA turbos be a good choice or 3071r or keep it kkk with k26/k27

**prj** · 7 April 2011, 15:12

Will the rally car run a restrictor?

If it will run a restrictor, 3071 is way too big.

**Jamo** · 7 April 2011, 15:13

Owen Developments do a 3071r with a restrictor for Rally cars no problem

**prj** · 7 April 2011, 15:16

Not convinced by that, sorry.
Depends on the restrictor size as well I guess, but on a small restrictor the 3071R will not provide a good powerband, GT28RS (but have fun mapping) or even stock turbo might be better suited. Maybe K24-7400, but need more people to run that first.

Anyway, this is assuming there IS a restrictor.
Maybe there's not. Then forget everything I said.

EDIT:
OP, is there a restrictor?
Are you using stock or aftermarket ECU?
Can you run antilag?

**NiTeC** · 7 April 2011, 15:23

no restrictor on the intake - 2.5" limit on the exhaust...that's all

they suggested 2871 would be better for faster spool up...since the car is FWD they said the 3071 would be an overkill...

so far I'm looking at approx 1700$ for the turbo 'kit' and about 1000$ for the chip/injectors/WG spring...

there are no specific HP numbers - I need a driveable quick car...there won't be many straight lines to use HP so I need fast spool and good predictable torque curve...

**prj** · 7 April 2011, 15:25

Ok. Then 3071R is too big I think.

Try the K24-7400?

http://www.s2forum.com/forum/showthread.php?t=47576

Get some RS2 or larger injectors, and RS2 exhaust manifold.
I'll be able to provide a chip for that in a month as well, and not for silly prices.

I agree that 3071R will be overkill on FWD car, I think you will just spin the wheels all the time in every gear and it won't be very controllable.

**Billman** · 7 April 2011, 15:28

I would say go with the 3071. It spools fast enough, if you want faster spool but not well up-top then take the 0.63 AR housing. If you want better traction down low (and with the FWD that is the subject) then go for the 0.82 AR.

If you want less torque down low then simply turn the boost down on lower revs.

**NiTeC** · 7 April 2011, 15:32

straight from the horse's mouth:

6.10.3 Engine

• Forced Induction Systems

o Intake systems are free.
o The quantity of Turbochargers and/or Superchargers installed on the engine must be OES. Example: An engine originally equipped with one turbocharger may not be upgraded to two or more turbochargers.
o Turbochargers and Superchargers are free.
o Boost controllers and waste gates are free.

• Inlet Restrictors

o All Level 3 vehicles (forced induction and naturally aspirated) shall be capable of accepting an engine inlet restrictor.
o Inlet restrictors may be implemented by the organizer to regulate Level 3 vehicle performance.
o The organizer will provide eight (8) months notice as to the requirement and size of the restrictors. Note: Inlet restrictors are not anticipated for the 2010 event.

6.10.4 Exhaust System

• Turbo Charged Engines:

o A single continuous pipe shall connect the turbo exit and the Catalytic Converter. This pipe shall not have an internal diameter larger than 2.5 inches at any point. All exhaust flow must pass through this pipe. If the vehicle is not equipped with a catalytic converter, the pipe diameter will extend to the muffler or to the end of the tail pipe, whichever occurs first.
o The pipe shall not be welded to the turbo exhaust port. The pipe shall be bolted to the turbo exhaust port.
o It shall be possible to unbolt this pipe for inspection by the scrutineer as required.

6.10.5 Ignition

• Ignition systems are free

6.10.6 Fuel Systems

• Fuel Systems are free.

6.10.7 Engine Management

• Engine Management is free

I think that answers all questions...

**S2central.net** · 7 April 2011, 16:01

Good luck with torque steer and other fun with a monster engine coupled to FWD.... doesn't sound ideal to me - especially for rally.

**NiTeC** · 7 April 2011, 16:32

it's what I'm working with...now how about that turbo?

**S2central.net** · 7 April 2011, 16:43

You dont think ~300bhp is enough for FWD ?

Seriously - if you are constrained by FWD then you'd be best investing time & effort into making the chassis the best it can be... the last thing you want is a turbo good for 450bhp on a drag strip when in actual fact - a nicely remapped stock turbo will give you less lag, better throttle response and much more usable boost & perfomance for a rally application. The uprated rods, lighter flywheel and such will make the engine rev sweeter - don't waste a penny on exotic turbos and wastegates here.

I'd go with stock turbo - probably with a 360 degree bearing. RS2 EM is nice to have but no big deal. Stock WG is fine too - 3" exhaust will be plenty big enough too...

SAVE your money friend - monster turbo just not required here... spend that money on suspension & brakes.

**NiTeC** · 7 April 2011, 17:03

valid suggestion - I've considered it but the old turbo's got ~300k on it so I'm not very excited about bolting it back on...even if I was to buy a stock new turbo it would cost me probably the same which is the only reason I'm looking to upgrade...

**my2000apb** · 7 April 2011, 17:20

id jsut completely rebuild the stock turbo

BT for AAN

BT for AAN

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