Bad boost gauge?

[FBA]

She's never getting over 10-11 PSI under WOT in even the lower gears, but she's shredding tires all the way up till well over - well... let's just say very high speeds. Am I looking at a bad boost gauge or is it somewhere else down the line?

 

[Black GT]

No, if you have a stock gauge it will not register your true boost. You need a mechanical gauge that reads your actual boost. I bought one from someone here. It looks exactly like the original but it reads to 30 psi.

 

[bonehead]

Stock or modified?
I was under the impression stock boosted to 15 since that's the max on the gauge. Apparently, 10-11psi is normal for unmodified cars.

 

[Black GT]

Here are a couple of pics.

 

[shelbyelite]

Your factory gauge won't read right with a whipple, which you have. Get free flyers gauge. Its awesome

 

[FBA]

It used to read 15 PSI before the Whipple. I was wondering if it was the gauge or my 800 HP turned into 300HP...but I have trouble keeping her straight under WOT through all the relevant gears...so I guess she's still makin' power! LOL. Shelby, the gauge you mentioned, is a factory fit?

 

[Black GT]

It used to read 15 PSI before the Whipple. I was wondering if it was the gauge or my 800 HP turned into 300HP...but I have trouble keeping her straight under WOT through all the relevant gears...so I guess she's still makin' power! LOL. Shelby, the gauge you mentioned, is a factory fit?

Look at pics I posted. It's the same gauge Shelby is taking about. Looks 100 percent factory except it reads true boost.

 

[FBA]

Stock or modified?
I was under the impression stock boosted to 15 since that's the max on the gauge. Apparently, 10-11psi is normal for unmodified cars.

With the standard smaller pulley and tune on the factory blower, she used to read 15 pinned. I never really checked with the Whipple under WOT because I dare not take my eyes off the road even for a half a second...it's that scary, even in 3rd and 4th. Today, I had a bit more balls, so I checked briefly and then asked my son to keep an eye on it during a few runs. But even in 3rd at 130+ with the rears still spitting, she never hit more than 10-11 from what I was able to see.

 

[FBA]

Look at pics I posted. It's the same gauge Shelby is taking about. Looks 100 percent factory except it reads true boost.

Gotcha! I will look at getting one, but sounds like I now have to run a vacuum line to the gauge? What's involved with that and where do you buy that gauge?

I found this at Speedo hut

http://www.speedhut.com/gauge/GR258-BOOST-02/1/Boost-Gauge-0-30psi-(w--warning)

 

[MTV8]

Your stock boost gauge will read differently depending on your MAFia setting. If you have Speedhut gauges, the scale can be adjusted to match.

 

[FBA]

Oh really? I had no idea...so because the MAF voltage reads lower than actual, the boost gauge is affected? Why can't Ford just get boost readings off the actual boost pressure instead of through the can bus?

So if I get the speedhut gauge, I can actually calibrate it according to actual measures we get on the line?

 

[Black GT]

Just get the one from free flyer. It's expensive, but worth it. You have to run line, but its not too bad. Had my GT tech do it for me. Plus it looks factory. Love it. It reads true manifold pressure.

 

[RALPHIE]

That is not a stock Ford Boost gauge as pictured. The stock gauge has the "0" setting at the 12 o'clock position, and only goes up to 15 psig. That is an after market gauge, and was developed when Whipples were being added to the OEM systems.

 

[FBA]

I tried to find the free flyer gauge online, but had no luck...

 

[Black GT]

I tried to find the free flyer gauge online, but had no luck...

He is a member here. See if you can look him up and PM him. Also Shelbly will have his contact. You will be impressed with the gauge.

 

[Black GT]

That is not a stock Ford Boost gauge as pictured. The stock gauge has the "0" setting at the 12 o'clock position, and only goes up to 15 psig. That is an after market gauge, and was developed when Whipples were being added to the OEM systems.

Yes, I still have my stock one in my garage. I see almost 20 psi a mile high.

 

[freeflyer]

My gauge is electronic and uses a 3 Bar MAP sensor. There is a small harness to run from inside the car to the engine compartment. Very easy install and PnP. Even Petunia was able to do it...

 

[MAD IN NC]

My gauge is electronic and uses a 3 Bar MAP sensor. There is a small harness to run from inside the car to the engine compartment. Very easy install and PnP. Even Petunia was able to do it...

ROFL - He watched Rich and Dennis put one in mine at the first Maryland get together. Great working device. I coupled mine with the Shadowman MAF mount.

http://www.britospeed.com/products.htm

 

[MTV8]

So if I get the speedhut gauge, I can actually calibrate it according to actual measures we get on the line?

If you are using 2 for the MAFia setting, doubling the boost readouts should calibrate it correctly.

 

[tmcphail]

Oh really? I had no idea...so because the MAF voltage reads lower than actual, the boost gauge is affected? Why can't Ford just get boost readings off the actual boost pressure instead of through the can bus?

So if I get the speedhut gauge, I can actually calibrate it according to actual measures we get on the line?

The factory boost gauge is inferred from MAFv. There is a 2 bar map sensor in the manifold but even if it was used for this purpose it would be done at 14.7