ShayneZ
Supporting VIP
- 14
- 1
- Jun 27, 2018
-
Lincoln,
Nebraska
This build is into it's forth year and thousands of hours in mech time with only a handfull of kills DAMMIT! : )
Whats the problem and description?
Our 1g streetable 5sp to auto converted grudge race drag car, still has a bunch of JNZ parts on it, including the jmf race mani, Kelford 280s and the Kiggly beehive springs, well it got boosted to like 65 psi and tweaked the exhaust valves.
What's weird is even after that overboost that sucker would still run very well at idle and would also still rock n roll with a boost of 33 psi but not a point more, even after turning up the hallman controller, and adding add springs to the wastegate 33 psi max???? WTH?
Here's the car running in this condition...
Anyway after much online research ( including the fact that we need MUCH STRONGER SPRINGS to do 65psi), we pull the head and see that the exhaust vales are not seating 100%... 98.5%? prolly, FRACK!!!!!!.
I mean I cannot even slide a piece of paper btw the head and valve, and it was holding 33psi, with that big S369 69mm turbo spining. Also the valves DID NOT HIT THE PISTONS. NICE!
So my question is:
If you had a need for speed on Sunday, would you pop the exhaust valves from another head, make sure they seat right and bolt the head back on? Or is it a must to have a machine shop mess with it?
Much love and thank everyone in advance for the advice!!! ; )
Whats the problem and description?
Our 1g streetable 5sp to auto converted grudge race drag car, still has a bunch of JNZ parts on it, including the jmf race mani, Kelford 280s and the Kiggly beehive springs, well it got boosted to like 65 psi and tweaked the exhaust valves.
What's weird is even after that overboost that sucker would still run very well at idle and would also still rock n roll with a boost of 33 psi but not a point more, even after turning up the hallman controller, and adding add springs to the wastegate 33 psi max???? WTH?
Here's the car running in this condition...
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Anyway after much online research ( including the fact that we need MUCH STRONGER SPRINGS to do 65psi), we pull the head and see that the exhaust vales are not seating 100%... 98.5%? prolly, FRACK!!!!!!.
I mean I cannot even slide a piece of paper btw the head and valve, and it was holding 33psi, with that big S369 69mm turbo spining. Also the valves DID NOT HIT THE PISTONS. NICE!
So my question is:
If you had a need for speed on Sunday, would you pop the exhaust valves from another head, make sure they seat right and bolt the head back on? Or is it a must to have a machine shop mess with it?
Much love and thank everyone in advance for the advice!!! ; )