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(Post Link) post #1 of 10 Old 30-08-15 Thread Starter
Status: Working Hard On 156 Veloce 3.0 Turbo Project
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Dump/Blow off Valve

Has anyone fitted a turbo and a dump valve.

Just wondering if the dump valve causes fuelling problems being run on a car with a MAF.

Does the 2.0 v6 turbo run with a MAF and has anyone got a dump valve fitted.

Also does it matter where the MAF is fitted as long as its before the throttle body ?

Reason for the questions is . When the Ecu takes the reading from the MAF and calculates the fuel to air ratio and then the pressurised air gets dumped the air to fuel ratio will then be incorrect.

but i thought if the MAF was after the dump valve closer to the throttle body the air will be dumped before it passes the MAF so the mixture ratio will be less effected.


any thoughts ?


thx in adavance

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I drove one on my V6tb with the old type of MAF and I dont recommend, it works fine on this new type plastic MAF.
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depends what engine
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(Post Link) post #4 of 10 Old 30-08-15 Thread Starter
Status: Working Hard On 156 Veloce 3.0 Turbo Project
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its a 156 2006 interior facelift 2.5 with a 3.0 166 engine (both cf3)
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you going to turbo this engine then?
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(Post Link) post #6 of 10 Old 31-08-15 Thread Starter
Status: Working Hard On 156 Veloce 3.0 Turbo Project
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Quote:
Originally Posted by rc_addicted View Post
you going to turbo this engine then?

Ive already done it with a bigger plenum neck and a f430 throttle body.

im just getting everything straight before i start body work
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Using an open BOV and a MAF will cause a little hickup after each shift - as measured air will not go into the engine... you could youse a RCV - recirculating (blow) Off Valve - as it's used in most recent turbo cars by factory.

best regards
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(Post Link) post #8 of 10 Old 31-08-15 Thread Starter
Status: Working Hard On 156 Veloce 3.0 Turbo Project
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Quote:
Originally Posted by Black-Sheep View Post
Using an open BOV and a MAF will cause a little hickup after each shift - as measured air will not go into the engine... you could youse a RCV - recirculating (blow) Off Valve - as it's used in most recent turbo cars by factory.

best regards
Thx for the reply

Thats what i thought but some people claim its ok on some cars , But no one mentioned Alfa's i will give it a test as its fitted and just swap it out for a recirculating bov if its bad.

Thx again Black-Sheep
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It's fine for MAP controlled cars, not for MAF. But as said BS, blowing it back post MAF will work fine.

You don't need to enlarge plenum neck or throttlebody in this boosted application btw.
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Yes Black Sheep and Yan.ko are right, just recirculate the air post MAF, pre turbo and all will be well. We have done this on 2.0 TS and 2.5 and 3.0 V6 motors running standard ECU, no mapping done, just extra injectors running of a mapped fueling ECU when the car is in boost. Good success on 0.4 bar, 0.6bar on stock internals and even one crazy car on 1.4bar boost (lowered CR, stock parts)
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