Drag/Standing mile project

[JohnTSI]

Seat pressure is 120/285 on the intake with the shims.

 

[okcpopeman]

Congrats John on the new PB in ET i saw the vid and the car is flying through mid-track

FWIW i had discussed shimming the Kiggly springs for my Evo set-up and he rec'd to shim them so they are somewhere around 0.050" to coil bind at peak lift.

He said that should get me to 110-115 seat pressure.

Thats what the Kelfords I am referring to are rated at with no shims. We have had 0 issues with these. Those Kiggly's should be fine though...

1-TX294HL High Lift Camshaft Set
"KVS63-BTK High Pressure Beehive Spring, Titanium retainer kit
Kelford Racing, High performance valve spring set (with spring base and titanium retainer) to suit 4G63 DOHC engines, EVO1-EVO9. 110 lb seated pressure for engines running over 2 bar"

 

[TRIXTSI]

Seat pressure is 120/285 on the intake with the shims.

How much boost were you running on these last couple passes?

Best of luck with everything

 

[JohnTSI]

First pass 40, second pass where they came off 45-46

 

[pneumo]

Boost pressure * intake valve area - seat pressure= valve float?
How high are you spinning it? Is the engine rpm spiking up between shifts?

 

[JohnTSI]

Was spinning to 10k on those passes, did not happen on the shift happened at the top of 3rd so no spike at all.

 

[pneumo]

Any chance the valvestems are sticking in the guides? Those big cams will side load the valves a bit, and sometimes a ported head also has the guides cut shorter so they don't protrude into the port.

 

[JohnTSI]

Head is unported. The machine shop will be checking it out next week so we will see what they find.

 

[eclipsed4seed99]

Anyone who cuts the guides back when they port heads should have their hands slapped

 

[JohnTSI]

On a side note, had been a while since I scaled the car and added some things. Race weight is 2837 with me in it and 6 gallons of E98.

 

[talonalex92]

Does the ethanol based fuel weigh more or less than standard gasoline?

 

[JohnTSI]

Haven't weighed it but surprisingly google says E98 weighs more, I would have thought it the opposite.