2 or 3 bars MAP sensor ?
Thread Starter
Pro
Joined: Dec 2010
Posts: 573
Likes: 4
2 or 3 bars MAP sensor ?
Hi,
Until now, i was rapping the PE table because i'm using the stock 1 bar MAP.
FYI, it's a LS1 block with full forged internal and a overspoon vorvech V3.SI with 8" and 3.125. Should shoot +15psi, but since it's a big cammed (less psi), long tube (less psi again) and 383 stroker (also less psi), not sure to hit +15psi
Can i gain some HP to go 2 or 3 bars ?
Should i choose 2 bars for have more step from 0kpa to 210kpa ?
For 3 bars, i find this : http://www.efisource.com/shop/ls1-st...ar-map-sensor/
It can be a good choice ?
Best regards
Until now, i was rapping the PE table because i'm using the stock 1 bar MAP.
FYI, it's a LS1 block with full forged internal and a overspoon vorvech V3.SI with 8" and 3.125. Should shoot +15psi, but since it's a big cammed (less psi), long tube (less psi again) and 383 stroker (also less psi), not sure to hit +15psi
Can i gain some HP to go 2 or 3 bars ?
Should i choose 2 bars for have more step from 0kpa to 210kpa ?
For 3 bars, i find this : http://www.efisource.com/shop/ls1-st...ar-map-sensor/
It can be a good choice ?
Best regards
Melting Slicks
Joined: May 2007
Posts: 2,014
Likes: 48
From: Dayton Ohio
I run a 2.5 bar and it works great and came with good info
http://www.dedicatedmotorsports.com/product_p/25bms.htm
http://www.dedicatedmotorsports.com/product_p/25bms.htm
Last edited by PEETYZ; Jan 12, 2017 at 11:04 AM.
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
Sounds like 2 bar is all you really need, more steps is better. The 2.5 is the option I'd recommend. I'm running a 2.5 and am very happy with that. I got my 2.5 MAP from a tuner who goes by Dsteck on HPtuner forum several years ago.
Biggest thing is the tune/ tuner.
Biggest thing is the tune/ tuner.
Last edited by Mike04; Jan 12, 2017 at 01:15 PM.
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
Originally Posted by Mike04
Sounds like 2 bar is all you really need, more steps is better. The 2.5 is the option I'd recommend. I'm running a 2.5 and am very happy with that. I got my 2.5 MAP from a tuner who goes by Dsteck on HPtuner forum several years ago.
Biggest thing is the tune/ tuner.
Biggest thing is the tune/ tuner.
Supporting Vendor
Joined: Apr 2012
Posts: 2,673
Likes: 370
From: Forney TX
Summing up what's already been said:
Tuning with a custom OS allows you to create values that are mathematically correct so that when you try and create histograms that compare desired AFR to yielded AFR, the table will get properly populated, making proper tuning easier. At a certain point, the MAF lacks the range needed to accomplish this, forcing the tuner to hack/"rape" the PE table to get the needed fueling which skews all the commanded AFR values. Proper fueling can be accomplished either way, but it's much easier to validate with a custom 2 or 3-bar OS and appropriate sensor.
Tuning with a custom OS allows you to create values that are mathematically correct so that when you try and create histograms that compare desired AFR to yielded AFR, the table will get properly populated, making proper tuning easier. At a certain point, the MAF lacks the range needed to accomplish this, forcing the tuner to hack/"rape" the PE table to get the needed fueling which skews all the commanded AFR values. Proper fueling can be accomplished either way, but it's much easier to validate with a custom 2 or 3-bar OS and appropriate sensor.
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Offering products from A&A Superchargers, East Coast Superchargers, Mechman Alternators, Mantic clutches, RPS clutches, Kooks Headers, Lakewood, LG, Brian Tooley Racing, Comp Cams, FAST, ARP, UPP Turbo systems, Wiseco, Callies, K1, MAST Motorsports, Haltech and many more. PM me for details.
Offering products from A&A Superchargers, East Coast Superchargers, Mechman Alternators, Mantic clutches, RPS clutches, Kooks Headers, Lakewood, LG, Brian Tooley Racing, Comp Cams, FAST, ARP, UPP Turbo systems, Wiseco, Callies, K1, MAST Motorsports, Haltech and many more. PM me for details.
Last edited by BLOWNBLUEZ06@RKT Performance; Jan 13, 2017 at 09:11 AM.
Drifting
Joined: Aug 2008
Posts: 1,399
Likes: 30
I just ordered the sensor you linked to to convert to a 3 bar HP Tuners OS. I've been tuning the stock OS failing the MAF. The resolution in the HP Tuners SD table will be the same (just copy my values over?) with just increased range in the VE table? My car is still mostly stock / NA.
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Safety Car
Joined: Apr 2007
Posts: 3,582
Likes: 137
From: SoCal CA
I ran a 2 bar up to 18psi. I just got a GM 3 bar off a ZR1 since I'll be going up to 25psi. Holley makes a nice adapter harness if you need one to go from LS1/2 to LS3 type map
Last edited by C5Natie; Jan 21, 2017 at 08:22 PM.
