Regarding added Boost....

[AGR]

Regarding added Boost.... + conversion chart

First: I am set to about 9+ PSI (.63 hkPa) on my MBC.

I was noticing this morning on my drive in to work (about 78 degrees); as I was watching my boost gauge, while accelerating hard, I would peak at about 8.99psi (.62 hkPA),,,still accelerating hard, as the boost reading drops immediately to about 7.69psi (.53 hkPa),,,, then to 6.38psi (.44 hkPa). If I hadn't been looking at the boost gauge, I wouldn't have known any better. The acceleration was fantastic!

A boost leak, perhaps?

hkPA to psi conversion

.76 hkPa = 11.02 psi
.75 hkPa = 10.88 psi
.74 hkPa = 10.73 psi
.73 hkPa = 10.59 psi
.72 hkPa = 10.44 psi
.71 hkPa = 10.30 psi
.70 hkPa = 10.15 psi
.69 hkPa = 10.00 psi
.68 hkPa = 9.86 psi
.67 hkPa = 9.72 psi
.66 hkPa = 9.57 psi
.65 hkPa = 9.43 psi
.64 hkPa = 9.28 psi
.63 hkPa = 9.14 psi
.62 hkPa = 8.99 psi
.61 hkPa = 8.85 psi
.60 hkPa = 8.70 psi
.59 hkPa = 8.56 psi
.58 hkPa = 8.41 psi
.57 hkPa = 8.26 psi
.56 hkPa = 8.12 psi
.55 hkPa = 7.98 psi
.54 hkPa = 7.83 psi
.53 hkPa = 7.69 psi
.52 hkPa = 7.54 psi
.51 hkPa = 7.40 psi
.50 hkPa = 7.25 psi

 

[AGR]

anyone?

 

[yashooa]

Well

Mine was leaking. I got out with the motor running and I could hear the hiss coming off the factory "t". The 3/16 hose is too big for my factory fitting. I zipped tied it down with a really small tie and it has a tiny bit of leak to it still but I am pulling 10PSI to 12psi spike and holding that boost.
It pulls much harder now. Before it would jump up and fall right back to 7-8PSI now it's bam 11-12PSi for a split second then a steady 10PSI pull to the shift point.

Woohoo.

 

[kwiktsi]

That is pretty common of the small ass turbo the car has coupled with a MBC. They spool so fast that the MBC and wastegate can't react fast enough to keep the boost steady. They also wil vary with load- there is more load down low so the boost is higher, less up top so the boost drops. I just put a $500 Blitz DSBC Spec R electronic controller in my car and it still does the same thing, just not as bad since it electronically measures boost and reacts to changes.
Joe

 

[MemphisRacer]

ya man, make sure we got everything on there good I know that with these type boost controllers if you hold it in boost for a while it slowly drops off to a level point, almost looks like your loosing boost!

 

[kwiktsi]

ya man, make sure we got everything on there good I know that with these type boost controllers if you hold it in boost for a while it slowly drops off to a level point, almost looks like your loosing boost!

Read above . My damn $500 Blitz electronic one is doing the same thing . It is the ineffecient turbo. Most controllers limit the same amount of boost through the WG line throughout the RPM range- when you get higher, the turbo looses effeciency and it takes MORE restriction on the line to hold the same boost. As mentioned, my electronic is a bit better, but still varies by up to 3 psi..
Joe

 

[AGR]

Thanks guys!!

I appreciate the responses.

Corey: Let's check out everything, when you have time.

But; it still feels mighty fine!

 

[yashooa]

Arterial

ya man, make sure we got everything on there good I know that with these type boost controllers if you hold it in boost for a while it slowly drops off to a level point, almost looks like your loosing boost!

Mine was more of a hemorrhage.
It was hissing like a tractor tire with a hole in it.
The boost would hit 11 and then plummet.
Now it holds very well.

 

[MemphisRacer]

Greg, whenever you get time man! Joe, you must have made your post just as I was clicking to submit mine Besides what you said, how is the Blitz working out? easy to install?

 

[kwiktsi]

Greg, whenever you get time man! Joe, you must have made your post just as I was clicking to submit mine Besides what you said, how is the Blitz working out? easy to install?

I like it for the in car control and presets- I have it set to 7 psi, 10 psi, 13 psi and 16 psi. This way I can turn it down for normal driving, 10-13 for playing on the street and 16 psi for race fuel once I get tuning done. thing that sucks though is it was hard to set the 13 and 16 since the stock plugs are too hot for 13 on pump gas and I never have race fuel to set the 16, so I had to set it up on my way back from the track after I had the race fuel in it .
Joe

 

[kwiktsi]

Oh yeah- I would not pay $500 for it though, not worth it to me. I got mine used for like $225
Joe

 

[InsidiousMSP]

Oh yeah- I would not pay $500 for it though, not worth it to me. I got mine used for like $225
Joe

Joe, sorry if I missed it, but are you doing anything about the "10psi fuel cut"? Has it been a problem for you?

 

[kwiktsi]

Joe, sorry if I missed it, but are you doing anything about the "10psi fuel cut"? Has it been a problem for you?

This has been addressed before, however here it is ..

It is not a 10 psi fuel cut, it is a load/airflow based fuel cut that aims for 10 psi but with varying temps and air density, it can range from 10-13 psi or so. I am working on a FCD for the car to help either totally eliminate it or just raise it past where any of us would run anyway. On a hot day, I was able to run 16 psi so I thought it was good to go until I hit the track last night and it fuel cut at 14 .. I am working on a different idea this week and seeing what happens when I get back to the track next Weds.
Joe

 

[InsidiousMSP]

This has been addressed before, however here it is ..

It is not a 10 psi fuel cut, it is a load/airflow based fuel cut that aims for 10 psi but with varying temps and air density, it can range from 10-13 psi or so. I am working on a FCD for the car to help either totally eliminate it or just raise it past where any of us would run anyway. On a hot day, I was able to run 16 psi so I thought it was good to go until I hit the track last night and it fuel cut at 14 .. I am working on a different idea this week and seeing what happens when I get back to the track next Weds.
Joe

Ah I see. But definitely the lowest it will cut out is at 10psi?

 

[I-Am-Chris]

That is pretty common of the small ass turbo the car has coupled with a MBC. They spool so fast that the MBC and wastegate can't react fast enough to keep the boost steady. They also wil vary with load- there is more load down low so the boost is higher, less up top so the boost drops. I just put a $500 Blitz DSBC Spec R electronic controller in my car and it still does the same thing, just not as bad since it electronically measures boost and reacts to changes.
Joe

What r u running the gain at?
mine is at 6 and i'm running 41 on channel 4 with my warning set at .75 and 15 knockdown? mine doesnt really do it at all

 

[I-Am-Chris]

Oh yeah- I would not pay $500 for it though, not worth it to me. I got mine used for like $225
Joe

Yeah i Was SUPOSSED to get mine for $330 brand new but i paid alittle more. fir 500 get a SBC-iD! that is the bomb ass boost controller!!! damn 13 psi?! wow that pushing it isnt it!

 

[kwiktsi]

What r u running the gain at?
mine is at 6 and i'm running 41 on channel 4 with my warning set at .75 and 15 knockdown? mine doesnt really do it at all

My gain is at 3, I am at 60 on channel 2 for my daily driving (10.5 psi) warning set to 1.2 bar and knockdown at 0 so it doesn't interfere with my boost settings. If I floor it from a stop or roll in 1st, it is about a 1-2 psi spike and a 1-2 psi drop off up top. If I floor it under a load (like a low RPM in 4th or something) it will hit about 14 and then drop off as the load decreases.
Joe

 

[kwiktsi]

damn 13 psi?! wow that pushing it isnt it!

We'll see .. If the car is in good tune and doesn't detonate, it should be ok. I have had it to almost 17-18 before in 1st and second and it is still here .. To quote a friend of mine about how he determines boost on his race motor- "keep turning it up until it blows, replace engine and back it down a quarter turn" ..
Joe

 

[MemphisRacer]

We'll see .. If the car is in good tune and doesn't detonate, it should be ok. I have had it to almost 17-18 before in 1st and second and it is still here .. To quote a friend of mine about how he determines boost on his race motor- "keep turning it up until it blows, replace engine and back it down a quarter turn" ..
Joe

(lol)(lol)(lol)
That is probably the most accurate tuning advice I have ever recieved in my entire life (2thumbs)

 

[kwiktsi]

(lol)(lol)(lol)
That is probably the most accurate tuning advice I have ever recieved in my entire life (2thumbs)

not gonna sugar coat it. This is new to all of us, someone has to find the limits .. It is not like a DSM where 50 gazillion people all know how far the can go. This is a new car with a lot of speculation and rumors, but no one knows for sure . I have already disproven a lot of the "theories" out there .
Joe
PS- He used the same saying about nitrous only it was up the jets till it blows, replace motor and back down 2 jet sizes .