Ordered a whipple! Anyone that's got any tips or insight plea

[Denali62]

Well. I got the truck towed in today and right off the bat they are giving me grief over my headers of all things.

 

They state I increased the output of the engine

 

I told them that wouldn't make a valve hit a piston etc afm known issues etc

 

Thinking about emailing mary barra.

[L86 All Terrain]

You are forgetting to take into account your transmission gear ratios. Final drive ratio must be multiplied by a given gear ratio in the transmission to determine driveshaft rpm at a determined speed. 4th gear - 1.69x3.23=5.46 5th gear - 1.27x3.23=4.10 6th gear - 1.00x3.23=3.23. If you are doing 60mph in 4th gear you will have a driveshaft rpm of 2974rpm, 60mph in 5th gets you 2235rpm, 1760rpm in 6th at 60mph. I cant remember what gear these 8L90 truck hit 100 but i think it is in the higher end of 5th gear mind you 37's may change that, if i am right you will turn 3725rpm at 100mph in 5th with a 37. You can also use combined trans/final ratios, tire circumfrence and engine rpm to figure out your true road speed. Or just use a GPS ;).

[Denali62]

That isn't correct. Driveshaft speed is the same at a given speed regArdless of transmission geAring

[Darth_Vader]

That isn't correct. Driveshaft speed is the same at a given speed regArdless of transmission geAring

You're numbers are right, just keep it under 135mph, lol!

[Denali62]

Also the 8l90 hits 100 in third

 

Stock hit 90-95 at the top of third

[Darth_Vader]

Well I'm stuck under 125mph with a 6k critical speed drive shaft, probably should of done carbon fiber myself.

[Denali62]

Looking at just swapping my pistons for wiseco forged, 10.5:1, replacing the drivers side head, and doing a DoD delete with a tsp sv cam with 32% lobe.

[Denali62]

Got this update

 

 

WE ARE CURRENTLY INN THE TEAR DOWN DIAGNOSTIC PHASE ON YOUR VEH. WE HAVE TO REMOVE HEAD TO INSPECT

 

INTERNAL FAULT. UNABLE TO DETERMINE WITH BORE SCOPE. ALL RESULTS AND TEST SPECS WILL TYEN GO TO GM ENGINEERING FOR ANALYSIS. AFTER THAT ENGINEERIG WEIIL TELL US NEXT PHASE OF REPAIR OR DISASSEMBLY BASED ON RESULTS. THERS PROCEDURES WILL TAKE INTO NEXT AS OF NOW.

 

ANY CHANGES OR PERTINENT UPDATES HAPPEN ILL GIVE YOU A SHOUT OUT.

 

 

Sounds a little better to me I'm still worried though

[Denali62]

Latest update :)JARED, WE CAN SEE NOTHING FROM ALL TESTS AND SPECS ANALYSIS THAT WOULD LEAD TO AN AFM FAULT.

 

APPEARD TO BE PURELY A GM COMPONENT FAILURE. AND I DON’T SEE ANY REASON WE DON’T GET OK AND PUT YOU A NEW ENGINE IN SHORTLY. THANKS FOR YOU PATIENCE WHILE WE GO THROUGH THE RED TAPE PROCESS FOR GM.

[Jennabear]

That stinks. Did you get the blower yet??? We are a Whipple dealer, it should not be taking this long for you to get it in your hands!

[Denali62]

Nope still waiting

. Already paid the credit card off lol

[Denali62]

I just got off the phone with "branden f."

 

He apologized and told me that they are about to get all the orders out.

[Jennabear]

You will certainly enjoy the extra ponies on this engine!

[Denali62]

I cannot wait to get it on and pushing some boost

[Denali62]

This is getting silly.