Got Boost - PnP 2.5bar MAP Sensor (pics)
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Posts: n/a
1st, no you can't run up to 14.7psi with the stock map (we're already at 14.7)... they do allow for boost, but they usually have issues around 11-12psi from shared experiences on our cars.
As for "how much boost" that's a trick question, depends a lot on how the engine was built, i.e. 4 bolt heads vs 6 bolt heads, what head studs there are a couple of different ARP offerings not just one and this will make a difference, and several other specs that matter as well. It comes down to the tune, the strength of the head to block bond as well as the engine valve train strength. Lots of guys push water around 18psi on LS2's with GM 4 bolt heads, but I have yet to hear any good evidence of what psi the heads are actually lifting... If someone else has some experience on this please chime in, I just haven't seen enough failures on FI LS2 cars to offer more than this...
As for "how much boost" that's a trick question, depends a lot on how the engine was built, i.e. 4 bolt heads vs 6 bolt heads, what head studs there are a couple of different ARP offerings not just one and this will make a difference, and several other specs that matter as well. It comes down to the tune, the strength of the head to block bond as well as the engine valve train strength. Lots of guys push water around 18psi on LS2's with GM 4 bolt heads, but I have yet to hear any good evidence of what psi the heads are actually lifting... If someone else has some experience on this please chime in, I just haven't seen enough failures on FI LS2 cars to offer more than this...
Perry, how long before you have another batch made?
Thread Starter
Burning Brakes
Joined: Jul 2005
Posts: 779
Likes: 2
From: Bloomingdale Illinois
If I am making ~11.5# now, you are saying I am pretty much at my limit with the stock MAP sensor? I was hoping to pulley down the engine next week in Dallas. It sounds like I need one of these 2.5 bar map sensors to do that.
Perry, how long before you have another batch made?
Perry, how long before you have another batch made?
I'm waiting for the parts to arrive.
I should have them in and ready to go in about a week.
I'll send you a PM
Perry
Former Vendor
Joined: Jun 2006
Posts: 1,622
Likes: 3
From: Dallas TX
I guess we were typing the same thing at the same time. 
That is what I am going to try and do Jeremy. I want to keep the benefits of the MAF sensor at cruising speeds and different weather conditions and use the 2.5 MAP to fuel my WOT tuning under boost where the MAF is useless.
I am getting a copy of a Beta 2.5 OS to test it on from HPT.
I hope I can get it dialed in that way.
I am soooo close to going with a BS3 so I am not limited in any way with these OEM PCM's.
I'm gonna give it one more try before the switch .
.
.
That is what I am going to try and do Jeremy. I want to keep the benefits of the MAF sensor at cruising speeds and different weather conditions and use the 2.5 MAP to fuel my WOT tuning under boost where the MAF is useless.
I am getting a copy of a Beta 2.5 OS to test it on from HPT.
I hope I can get it dialed in that way.
I am soooo close to going with a BS3 so I am not limited in any way with these OEM PCM's.
I'm gonna give it one more try before the switch .
.
.
You would pretty much either need to retain the ECM and use the BS3 or you would loose a ton of the creature comforts. I think the 2.5 HP will be the ticket... if we can get our hands on it
Former Vendor
Joined: Jan 2007
Posts: 155
Likes: 0
From: Columbia City IN
I think you are on the right track Perry. Integration of the BS3 into the C6 would be a nightmare. At least if you wanted to retain all of your factory gauges and keep the BCM from freaking out.
You would pretty much either need to retain the ECM and use the BS3 or you would loose a ton of the creature comforts. I think the 2.5 HP will be the ticket... if we can get our hands on it
You would pretty much either need to retain the ECM and use the BS3 or you would loose a ton of the creature comforts. I think the 2.5 HP will be the ticket... if we can get our hands on it
With a stand alone, there is no table limits to injector size or any emissions tables.
Former Vendor
Joined: Jun 2006
Posts: 1,622
Likes: 3
From: Dallas TX
You would be surprised how easy it is to "wire in" a bs3, virtually no wiring involved. People freak out due to it being a "stand alone", in a street car it stands by the stocker per say. I just did a 06 gto, should fire up within the next month or so. I have a 98 TA just done, factory everything still works, TCS, security, dash, whole 9 yards lol.
With a stand alone, there is no table limits to injector size or any emissions tables.
With a stand alone, there is no table limits to injector size or any emissions tables.
First of all in the Corvette you would loose almost all of your dash displays unless you wanted to keep the factory ecm and bcm just there to give you these vitals while Y-ing off to the BS3 and the factory ECM and try to keep it from freaking out. The dash cluster doesn't operate on a stand alone basis like a GTO or a 98 F-body which are MUCH more basic. The exception would be if you were ONLY concerned with the raw vitals, these could be rigged up. Stuff like electronics diagnostics via OBDII port become non existent. Vehicle will absolutely not pass emissions in most states as there is no longer an operational OBDII port for engine diagnostics. For an all out race car where some of these creature comforts are not needed I would agree (or maybe the guys where money is no object). But for a big horsepower STREET car it would be an expensive way to achieve the same goals.
With that said, everything has it's place and guys looking for the ultimate in power and engine/power adder control look no further than the Big Stuff 3 - I have one for my personal car.
Last edited by Taylor@DallasPerformance; Oct 2, 2008 at 12:56 PM.
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Thread Starter
Burning Brakes
Joined: Jul 2005
Posts: 779
Likes: 2
From: Bloomingdale Illinois
Hey my CF friends. It's been a while. Been busy as hell running 4 businesses.
Yes fperra, the 2.5 bar maps are still available. Sold over 100 units.
can't put a link up but search google for:
" dpe 2.5 bar map "
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.
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Yes fperra, the 2.5 bar maps are still available. Sold over 100 units.
can't put a link up but search google for:
" dpe 2.5 bar map "
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Former Vendor
Joined: Jun 2006
Posts: 1,622
Likes: 3
From: Dallas TX
Dang buddy good to hear you're still alive!
Hope all is well!
Would like to know the same...
Former Vendor
Joined: Jun 2006
Posts: 1,622
Likes: 3
From: Dallas TX
Depends on which ecu you have. For instance 2005 vette, HPT offers a custom 2.5 bar OS. Therefore 3 bar MAP won't calibrate correctly since 255 kpa is the hardlimit in the OS.
Some ECU's will support only 2 bar others can do 3 bar, get an appropriate sensor.
Some ECU's will support only 2 bar others can do 3 bar, get an appropriate sensor.
Le Mans Master
Joined: Oct 2003
Posts: 8,863
Likes: 86
From: PA
St. Jude Donor '08
Depends on which ecu you have. For instance 2005 vette, HPT offers a custom 2.5 bar OS. Therefore 3 bar MAP won't calibrate correctly since 255 kpa is the hardlimit in the OS.
Some ECU's will support only 2 bar others can do 3 bar, get an appropriate sensor.
Some ECU's will support only 2 bar others can do 3 bar, get an appropriate sensor.
map axis is adjustable
Safety Car
Joined: Feb 2008
Posts: 3,712
Likes: 3
From: TEXOMA
St. Jude Donor '08-'09
its adjustable in the 2.22 version as well.
i just installed the 2 bar 5136 baro map sensor from the cobalt on my 06 (plug and play)
i used 200 linear and 8.33 offset
and using bluecats eq<>ve program i can tune my VE now up to 2bar.
fun stuff and glad a got a laptop with 5 gigs and 2.66 core 2 duo!
if i ever hit over 14 psi ill have to get one of these sweet sensors!! but im only hitting 164 kPa or about 9.1 psi
-carl
p.s. this is with stock ecu os, i think your talking about the custom 2.5
i just installed the 2 bar 5136 baro map sensor from the cobalt on my 06 (plug and play)
i used 200 linear and 8.33 offset
and using bluecats eq<>ve program i can tune my VE now up to 2bar.
fun stuff and glad a got a laptop with 5 gigs and 2.66 core 2 duo!
if i ever hit over 14 psi ill have to get one of these sweet sensors!! but im only hitting 164 kPa or about 9.1 psi
-carl
p.s. this is with stock ecu os, i think your talking about the custom 2.5
Last edited by carlrx7; Dec 6, 2009 at 12:29 AM.
Le Mans Master
Joined: Oct 2003
Posts: 8,863
Likes: 86
From: PA
St. Jude Donor '08
its adjustable in the 2.22 version as well.
i just installed the 2 bar 5136 baro map sensor from the cobalt on my 06 (plug and play)
i used 200 linear and 8.33 offset
and using bluecats eq<>ve program i can tune my VE now up to 2bar.
fun stuff and glad a got a laptop with 5 gigs and 2.66 core 2 duo!
if i ever hit over 14 psi ill have to get one of these sweet sensors!! but im only hitting 164 kPa or about 9.1 psi
-carl
p.s. this is with stock ecu os, i think your talking about the custom 2.5
i just installed the 2 bar 5136 baro map sensor from the cobalt on my 06 (plug and play)
i used 200 linear and 8.33 offset
and using bluecats eq<>ve program i can tune my VE now up to 2bar.
fun stuff and glad a got a laptop with 5 gigs and 2.66 core 2 duo!
if i ever hit over 14 psi ill have to get one of these sweet sensors!! but im only hitting 164 kPa or about 9.1 psi
-carl
p.s. this is with stock ecu os, i think your talking about the custom 2.5
carl it is NOT available 2.22
carl the map offset, what u referred to above, is not what i was referring to. the voltage offset is NOT the same as the map axis xref.
BTW.....
"i think your talking about the custom 2.5"
thanks for letting me know what i was talking about
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Last edited by NICK YOSKIN; Dec 6, 2009 at 11:09 AM.
Racer
Joined: Jan 2009
Posts: 321
Likes: 2
From: Southern NH
Its great to see some real ingeninuity out there. When I first heard about this sensor, my first thought was it was a repackaged GM sensor or aftermarket sensor and I was think the price was all markup...so I was looking more seriously at an LS9 3 Bar. Then forum member Shizon (who suggested the tighter resolution of this 2.5Bar sensor would be better for my setup) told me about this write up and how you built these with nothin but an idea and what you had lying around the shop. That really changes my perspective and suddenly you can see where the costs are in time, development, materials and its worth every penny. I'm really impressed.