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Cadillac XLR-V Series Forum Discussion, RATTLE Snake Bite the XLR-V in Cadillac V-Series Forums; Originally Posted by TimmyC What did the temps get to with that pump installed? I've been trying to learn how ...
  1. #106
    GizmoQ's Avatar
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    RattleSnake

    Quote Originally Posted by TimmyC View Post
    What did the temps get to with that pump installed?
    I've been trying to learn how to datalog the cars ODBII with a program called PCMSCan. Only done a few but the IAT ranges from 88 to 133 degrees while cruising on the highway and some city stop and go traffic. I know it shoots up pretty quick when I accelerate, but it comes right down. My average on a 22 mile commute (16 of which is interstate) was 90 and the outside temp was 90.

    Well had a scare this weekend. Was on my way to autocross on Sunday, got behind a slower car on I-70, went to pass and as the passing gear kicked in the blower spun up faster than the ECM could keep up. There was a loud thud and then P0014/P0024 and the exhaust cams were out of sync with the Crank. The motor rattled and shook and sounded like a hoopty without a muffler. Power went way down and oil pressure dropped to 10PSI. I thought I blew the heads of the motor. Had it towed to the dealership, told them what I did, and what happen and left it to them.

    Dealership said the crank bolt had backed out and caused the low oil pressure. The low oil pressure caused the cam position system to malfunction, etc, etc, etc. The MasterTech who works on my car there said this is also seen on the ZR1 Corvettes where the threads on the crankbolt get stretched so GM redesigned the bolt and that's what he put into my motor.

    Moral of the story: I have renamed this mod from Snake Bite to Rattler (Must be a Diamondback cause this ain't been cheap). This is the third time I've had bolts walk out of their seats since I installed this supercharger. The SC and the gears rattle so much the car wants to disintegrate. I don't feel it from my seat of the pants meter, but I know its there. I will be checking the bolts everywhere on at least a monthly basis from now on.

    Back to the datalogging. One parameter that I can monitor is "Intake Manifold Absolute Pressure." I thought this was a sensor prior to the supercharger. Yes?? No?? Someone fill me in cause the same log I got the IATs data from showed this sensor ranging from 3.3lbs to 23lbs with an average of 7.5lbs. Should I be concerned??

    Next week I have a 2000 mile road trip planned two car shows and ending with autocross at the conclusion. Let's hope the Rattler can hold together. I'll be data logging a few legs of the trip to review when I get back home.

    I'll then get to work on the exhaust.
    Snake Bit Super Chilled Black Raven 2006 Cadillac XLR-V aka Elwood (Jake's brother)
    Verified 501rwhp and 486TQ at 6000RPM so far...final goal 575/550

    ELWOOD - "Corvette in a Tuxedo ... with a Jet Pack"



    2013 St Louis Region SCCA Solo SSM Class Champion
    Texas Mile Record Holder: Street Legal XLR @ 159.5MPH
    ECTA LSR Record Holder: 4.2-5.0L Blown Gas Modified Sports Car

  2. #107
    GizmoQ's Avatar
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    RATTLE Snake Bite

    Oops, forgot the dyno sheet. Since I forgot to bring my thumb drive had to scan the printout with my crappy scanner. Here's the file.
    Snake Bit Super Chilled Black Raven 2006 Cadillac XLR-V aka Elwood (Jake's brother)
    Verified 501rwhp and 486TQ at 6000RPM so far...final goal 575/550

    ELWOOD - "Corvette in a Tuxedo ... with a Jet Pack"



    2013 St Louis Region SCCA Solo SSM Class Champion
    Texas Mile Record Holder: Street Legal XLR @ 159.5MPH
    ECTA LSR Record Holder: 4.2-5.0L Blown Gas Modified Sports Car

  3. #108
    wait4me's Avatar
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    Re: RATTLE Snake Bite the XLR-V

    It is hard to read the boost numbers but in yellow on that dyno graph, it says 14.4 was the min boost at 3200rpm and max was 18.8 at 6000rpm and still climbing.

    The Fuel was pretty easy to get exact what i was wanting with the modded injectors, You can see how smooth the fuel chart is with my target at 11.8 then moving a little richer, then moving back in slowly as rpms increased. Not bad for a 300 dollar mod.

  4. #109
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    Re: RATTLE Snake Bite the XLR-V

    Quote Originally Posted by wait4me View Post
    Not bad for a 300 dollar mod.
    Are you referring to the injectors?

  5. #110
    GizmoQ's Avatar
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    Re: RATTLE Snake Bite the XLR-V

    Quote Originally Posted by PGA2B View Post
    Are you referring to the injectors?
    Yes.
    Snake Bit Super Chilled Black Raven 2006 Cadillac XLR-V aka Elwood (Jake's brother)
    Verified 501rwhp and 486TQ at 6000RPM so far...final goal 575/550

    ELWOOD - "Corvette in a Tuxedo ... with a Jet Pack"



    2013 St Louis Region SCCA Solo SSM Class Champion
    Texas Mile Record Holder: Street Legal XLR @ 159.5MPH
    ECTA LSR Record Holder: 4.2-5.0L Blown Gas Modified Sports Car

  6. #111
    TimmyC is offline Cadillac Owners Connoisseur
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    Re: RATTLE Snake Bite the XLR-V

    Quote Originally Posted by wait4me View Post
    It is hard to read the boost numbers but in yellow on that dyno graph, it says 14.4 was the min boost at 3200rpm and max was 18.8 at 6000rpm and still climbing.

    The Fuel was pretty easy to get exact what i was wanting with the modded injectors, You can see how smooth the fuel chart is with my target at 11.8 then moving a little richer, then moving back in slowly as rpms increased. Not bad for a 300 dollar mod.
    I've used modded injectors from them too and been happy with them.

    I asked before but it kind of got lost, how much of a difference did the upgraded intercooler pump make in the IAT2s?

  7. #112
    JimmyH is offline Cadillac Owners 10000+ Posts
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    Re: RATTLE Snake Bite the XLR-V

    Can't wait to see the snake next weekend!

  8. #113
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    Re: RATTLE Snake Bite the XLR-V

    Quote Originally Posted by JimmyH View Post
    Can't wait to see the snake next weekend!
    Keep your fingers crossed. I got 2000 mile to travel between now and then.
    Snake Bit Super Chilled Black Raven 2006 Cadillac XLR-V aka Elwood (Jake's brother)
    Verified 501rwhp and 486TQ at 6000RPM so far...final goal 575/550

    ELWOOD - "Corvette in a Tuxedo ... with a Jet Pack"



    2013 St Louis Region SCCA Solo SSM Class Champion
    Texas Mile Record Holder: Street Legal XLR @ 159.5MPH
    ECTA LSR Record Holder: 4.2-5.0L Blown Gas Modified Sports Car

  9. #114
    550HP STSV is offline Banned
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    Re: RATTLE Snake Bite the XLR-V

    Gizmo, what is the model# of the injectors you upgraded to?

  10. #115
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    Re: RATTLE Snake Bite the XLR-V

    Quote Originally Posted by 550HP STSV View Post
    Gizmo, what is the model# of the injectors you upgraded to?
    Jesse pull the OEM injectors and had them sent out for mod.
    Snake Bit Super Chilled Black Raven 2006 Cadillac XLR-V aka Elwood (Jake's brother)
    Verified 501rwhp and 486TQ at 6000RPM so far...final goal 575/550

    ELWOOD - "Corvette in a Tuxedo ... with a Jet Pack"



    2013 St Louis Region SCCA Solo SSM Class Champion
    Texas Mile Record Holder: Street Legal XLR @ 159.5MPH
    ECTA LSR Record Holder: 4.2-5.0L Blown Gas Modified Sports Car

  11. #116
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    Re: RATTLE Snake Bite the XLR-V

    Well the first road test is complete. I now have 3700 miles on the RattleSnake Bite. Two trips to Warsaw, IN. Then mostly highway From St Louis to Indy to Charleston, SC and returned home via Tail of the Dragon to Indy for the V meet and autocross the next day and finally back home. Been raining here daily so it sits waiting for clear skies. The new tires were great on the highway , but sucked for autocross - I spun in round three.

    Cruising the Carolinas was a blast.




    O.K. back to the mods. I gotta find time to pull down the exhaust so I can gut the cats, but I won't do it till after I pass the OBDII emissions test. Emissions test is top priority this month and shouldn't be a problem. The last code I had was traction control during the autocross.

    Till them I'm doing cosmetic mods to fill in/cover the exposed engine sections from the loss of the engine cover. Adding additional emblems (Rattlesnakes). And bench testing the CarPC to be installed between the seats.

    I'll be in Indy most of next month for all the 150th Indy 500 festivities so I don't expect to get a whole lot done. June should be a big month for adding HP.
    Snake Bit Super Chilled Black Raven 2006 Cadillac XLR-V aka Elwood (Jake's brother)
    Verified 501rwhp and 486TQ at 6000RPM so far...final goal 575/550

    ELWOOD - "Corvette in a Tuxedo ... with a Jet Pack"



    2013 St Louis Region SCCA Solo SSM Class Champion
    Texas Mile Record Holder: Street Legal XLR @ 159.5MPH
    ECTA LSR Record Holder: 4.2-5.0L Blown Gas Modified Sports Car

  12. #117
    Mitch_Syd is offline Cadillac Owners Member
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    Re: RATTLE Snake Bite the XLR-V

    great thread

  13. #118
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    Re: RattleSnake

    Quote Originally Posted by GizmoQ View Post
    One parameter that I can monitor is "Intake Manifold Absolute Pressure." I thought this was a sensor prior to the supercharger. Yes?? No?? Someone fill me in cause the same log I got the IATs data from showed this sensor ranging from 3.3lbs to 23lbs with an average of 7.5lbs. Should I be concerned??
    Sorry I'm am a little late on this one but:

    That can be converted to boost. That is actually the pressure inside your manifold normally measured in kPa (Kilopascals) but can be converted to psi. Not sure how your scanner is representing it in lbs though.

    I made a boost gauge in my HP Tuners software to monitor it.

    Basically

    MAP-Barometric pressure= Boost

    If you do a Google search for kPa to Boost conversion there is TONS of info.

  14. #119
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    Re: RATTLE Snake Bite the XLR-V

    hmmm. PID#?

  15. #120
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    Re: RATTLE Snake Bite the XLR-V

    PID for what?

    PID.11 is MAP and PID.51 is Baro. Here is the formula for my boost gauge.

    ([PID.11.PSI]-[PID.51.PSI])*(([PID.11.PSI]<[PID.51.PSI])+1+(([PID.11.PSI]<[PID.51.PSI])*.04))

    But that will only work in HP (I think).

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