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Thread: Sniper EFI Learn

  1. #11

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    OK, went & tried that, did not start Learning. Went ahead & reset the system and got to operating temperature and the Learn became active. Went & drove it. Stayed Learning until I got on freeway and then my temp dropped to 150°F. Got off of highway my temp came back up and started to Learn. I've known that there's about 20° difference between my head temp where I have my manual gauge, and the intake where I have my temp sensor. Is there anything I can do to get the temp to match what my head is reading?

  2. #12
    Join Date
    Dec 2009
    Location
    Connecticut
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    17,700

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    Quote Originally Posted by Tspears View Post
    Stayed Learning until I got on freeway and then my temp dropped to 150°F. Got off of highway my temp came back up and started to Learn.
    Does your thermostat work properly? Why would the engine temperature be 150°F on a daily driven vehicle?

    I've known that there's about 20° difference between my head temp where I have my manual gauge, and the intake where I have my temp sensor.
    I'd only be concerned with the Sniper CTS temperature.

    Is there anything I can do to get the temp to match what my head is reading?
    Not with the 3.5" TSLCD, but the Sniper EFI software might have a CTS Offset function in the Sensors ICF.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  3. #13

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    My manual gauge matches the thermostat 180°. Even when I had the FiTech on it, it was the same about 20° difference. Also, it's about 35° outside today.

  4. #14
    Join Date
    Oct 2016
    Location
    Middle River, MD
    Posts
    249

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    I had the same issue. My two readings matched for about 2 or 3 days. Then Sniper EFI reading was 15-20 degrees colder. I only noticed it because I saw it was not in the LEARN mode while driving on the highway. My Auto Meter sensor and the Holley sensor are both in the intake, both below thermostat, and within a few inches of each other, as seen in the picture below. Bought a new sending unit locally, using a 2002 Chevy Express 2500 with 4.3L engine as the application. The temperatures match perfectly now, and no problem reaching (and/or staying in) Learning mode. I used Standard Motor Products TX3T: http://www.rockauto.com/en/catalog/c...+/+sensor,4748

    Click image for larger version. 

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    Last edited by rel3rd; 01-09-2017 at 06:59 AM.

  5. #15

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    What engine is that?

  6. #16
    Join Date
    Oct 2016
    Location
    Middle River, MD
    Posts
    249

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    Big Block Chevrolet.

    Click image for larger version. 

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    Last edited by rel3rd; 01-09-2017 at 09:42 AM.

  7. #17

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    I thought big block had to have the hose from the intake to the water pump? BTW, I have a 454.

  8. #18
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    17,700

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    Quote Originally Posted by Tspears View Post
    I thought big block had to have the hose from the intake to the water pump?
    It's called a water pump bypass hose. It's only eliminated when using a thermostat with the (3) bypass holes in it. But that's not a modification for a street driven vehicle.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  9. #19
    Join Date
    Oct 2016
    Location
    Middle River, MD
    Posts
    249

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    Quote Originally Posted by Tspears View Post
    I thought big block had to have the hose from the intake to the water pump? BTW, I have a 454.
    Quote Originally Posted by Danny Cabral View Post
    It's called a water pump bypass hose. It's only eliminated when using a thermostat with the (3) bypass holes in it. But that's not a modification for a street driven vehicle.
    With the Weiand Stealth, I could not find a hose nipple with anywhere near the correct angle, so as Danny said, I drilled a couple holes in the thermostat's outer edge.

    My car is 90% street, and even has factory (and still functional) air conditioning.
    I run an AutoZone sourced aluminum/plastic tanked radiator, 180° Stant thermostat, ACDelco replacement cast iron water pump, factory 2-piece shroud, Hayden HD fan clutch, and factory 7-blade fan.
    I built this engine over 3 years ago, a 93 octane, 10.87:1 compression, 439 cubic inch big block, that runs it's best at 44° of total timing, and the car has never ever came close to running hot...ever. It maintains 177°-180° this time of year no matter how hard it's ran, and with East Coast heat & humidity, in stop & go with A/C on full blast, it's never been over 195-196. Just an FYI.

  10. #20

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    Quote Originally Posted by Danny Cabral View Post
    It's called a water pump bypass hose. It's only eliminated when using a thermostat with the (3) bypass holes in it. But that's not a modification for a street driven vehicle.
    Thank you for clarifying, I have it on mine.

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