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stage 1 tune - acceptable knock? datalog attached

L

lleron

Ready to race!
M

markgbe

Passed Driver's Ed
brobst said:
Can you get some better gas? Or add 1 gal of e85 to your tank

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This 93 I am using is the best around but there may be some 100 octane around . I'll try the e85 thing in the mean time. Thanks
 
brobst

brobst

Go Kart Champion
You are also up north where gas is different in the winter/summer.
You can try what I said above, or just wait till summer gas and see if its better

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M

markgbe

Passed Driver's Ed
brobst said:
You are also up north where gas is different in the winter/summer.
You can try what I said above, or just wait till summer gas and see if its better

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Yeah i'll give that a shot. I datalogged in today, just normal driving and zero knock, so it doesn't seem like i'm at risk of blowing the engine at the present time.

Thanks again!
 
lilonespaz

lilonespaz

Drag Race Newbie
up to -3 knock is completely normal for our cars.
 
M

markgbe

Passed Driver's Ed
lilonespaz said:
up to -3 knock is completely normal for our cars.
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yeah, was reading that on some threads. Some people were mentioning that if it occurs consistently on multiple cylinders and at certain RPM ranges, that it might need to be addressed.
 
B

BudgetPhoenix

Autocross Champion
Ive heard -3 is acceptable as well. Mine only tends to show a little knock -.75-2.25 around the 3800-4800 rpm range though at WOT
 
A

adema69

Ready to race!
What are your mods? -3 is acceptable most bench tunes will run that as they run aggressive timing. When your in the -4 to -6 range is when you want to start worrying. Adding a gallon of e85 will most likely do nothing if not cause more knock or timing to be pulled.

add some water methanol kit to your system and will help bring those numbers down a ton.
 
M

markgbe

Passed Driver's Ed
adema69 said:
What are your mods? -3 is acceptable most bench tunes will run that as they run aggressive timing. When your in the -4 to -6 range is when you want to start worrying. Adding a gallon of e85 will most likely do nothing if not cause more knock or timing to be pulled.

add some water methanol kit to your system and will help bring those numbers down a ton.
Click to expand...

Only mod is r8 coils, bone stock otherwise
 
zef

zef

Drag Racing Champion
adema69 said:
What are your mods? -3 is acceptable most bench tunes will run that as they run aggressive timing. When your in the -4 to -6 range is when you want to start worrying. Adding a gallon of e85 will most likely do nothing if not cause more knock or timing to be pulled.

add some water methanol kit to your system and will help bring those numbers down a ton.
Click to expand...

This.

I switched to Sunoco or Shell 93 only and my knock went away completely. No more Cumberland Farms/Citgo/Valero etc etc
 
W

wmssbr10

Passed Driver's Ed
zef said:
This.

I switched to Sunoco or Shell 93 only and my knock went away completely. No more Cumberland Farms/Citgo/Valero etc etc
Click to expand...

But Cumby's has 1 buck coffee! Weird this thread shows up as I've noticed more -3 events than normal but last fill was Cumby's.
 
thatspsychotic

thatspsychotic

Ready to race!
adema69 said:
Adding a gallon of e85 will most likely do nothing if not cause more knock or timing to be pulled.
Click to expand...

I agree with the might do nothing part, but when I add 3 gallons of E85 to my fillup from time to time depending on where I am, the car runs much better on the same tune. It's common knowledge that adding E85 increases octane to a modest degree, but adding 1 gallon would mayyybe raise the octane 0.5 points. Will definitely NOT cause more knock or timing pull, that you can be sure of.
 
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