Generic Tunes And Boost Pressures

[coach3062]

I need input from the many wise heads that populate this forum.

How much does the position of the boost gauge hookup relate to the pressure reading on a boost gauge?

My Speco boost gauge reads 8lbs on standard, 12psi on the generic 8lbs program and 15lbs on the generic 10lbs one.

Does this mean that that by the time the boosted air reaches the throttle body that friction losses, restrictions and obstructions in the flow path (ie: intercooler etc) cause the pressure to drop? Or do I have a crappy gauge that needs to be calibrated or should I send my gauge to turbo heaven?

I currently have my gauge run off a t-piece straight from a pickup on the snail. Is this where most are connected, or if not, where should it be plumbed?

[exahsix]

Without knowing the exact fittings on the engine I would say the best place to fit the hookup is as close to the inlet valves as possible. Thoeretically this gives the most "true" boost reading of what's going in the engine. So a t piece or fitting on the inlet manifold would be best.

That way all the pressure losses of the piping and interooler are accounted for.

[Mac Daddy]

most members have opted to fit the t piece on the pipe connecting the bov behind the crossover manifold including m and it is always fairly accurate give or take .5 psi

[LightningXR6T]

most members have opted to fit the t piece on the pipe connecting the bov behind the crossover manifold including m and it is always fairly accurate give or take .5 psi

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I have connected my boost gauge in this position. Std tune registers 6psi, 8psi tune registers 11psi and the 10psi registers 15psi. Have had the T checked by Ford, had tunes updated by supplier, no one seems to be able to answer why. I have verified that the gauge is reading correct by having it checked by a company that calibrates gauges for mining and medical industries. This company is also the only registered business here that can work on police vehicle gauges!

[Adam]

I currently have my gauge run off a t-piece straight from a pickup on the snail. Is this where most are connected, or if not, where should it be plumbed?

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That explains why your gauge is showing more pressure.

Because of the pressure drop that occurs across the intake and intercooler the turbo has to produce more boost to overcome this. So getting 8PSI to the throttle body might actually take 12PSI from the turbo.

[FPV TRANNY]

most members have opted to fit the t piece on the pipe connecting the bov behind the crossover manifold including m and it is always fairly accurate give or take .5 psi

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I have connected my boost gauge in this position. Std tune registers 6psi, 8psi tune registers 11psi and the 10psi registers 15psi. Have had the T checked by Ford, had tunes updated by supplier, no one seems to be able to answer why. I have verified that the gauge is reading correct by having it checked by a company that calibrates gauges for mining and medical industries. This company is also the only registered business here that can work on police vehicle gauges!

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If your gauge is true I would believe that 15psi on std injectors would mean KABOOM

[LightningXR6T]

most members have opted to fit the t piece on the pipe connecting the bov behind the crossover manifold including m and it is always fairly accurate give or take .5 psi

←

I have connected my boost gauge in this position. Std tune registers 6psi, 8psi tune registers 11psi and the 10psi registers 15psi. Have had the T checked by Ford, had tunes updated by supplier, no one seems to be able to answer why. I have verified that the gauge is reading correct by having it checked by a company that calibrates gauges for mining and medical industries. This company is also the only registered business here that can work on police vehicle gauges!

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If your gauge is true I would believe that 15psi on std injectors would mean KABOOM

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That is why I removed that tune immediately. I currently run the 8psi (11psi) tune and a friend of mine who has had his T custom tuned by Intune @ 256rwkw's, says my T feels stronger.

I know if I took it to CAPA they would sought it out in a heartbeat. But here in Newcastle there's no one who can help!

[Street Tuner]

Connecting the boost gauge up properly - ie to the manifold would be a good place to start

[BFHOON]

anywhere after the throtle body butterfly