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When to safely drop pulley size?

2007GPGTSC

2007GPGTSC

New member
Applicaion :

2007
Pontiac
GP GT S/C
100k mileage

Mods:
Intake
NGK TR55's
ZZP 10+mm wires
180* Tstat
ZZP 3" Cat'd DP
ZZP Plog - I made this choice budget wise because I am not building a track car simply a budget DD with some cojones

I know this post has probably been answered somewhere on the 100+ pages of forum info - although I would like some new input.

Just needs some facts no hating, just hard facts of what else I need to do to safely drop to a 3.6 pulley or lower while minimizing KR obviously - I know the gain will not be jaw dropping just want my DD to run purdy.

Keep in mind I have never scanned for KR and have no idea what it may be registering. Honestly I have no idea how to scan for KR with out an aftermarket gauge ect. quite frankly I have no desire to put an aftermarket cluster in. How shall I check for KR with out doing so ?

Thanks for your input !
 


Torque pro on your android phone to monitor on a budget/know where you are. It's a bit slower than a gauge, but it takes its data from the same source.
 
OBD2 Bluetooth Adapter available on fleabay... $15-20... Torque Pro Android App $5... And you can read KR. 3.6 "shouldn't" be a problem... But measure knock before drop. You can't tune anything so if you drop and see KR, then you've got to pulley back up.
 
Just out a curiosity what would the net gain be from dropping from a 3.8 pulley to a 3.6 pulley is the gain worth is? debatable? like I said I am not expecting jaw dropping 20+whp maybe a 3-6 whp gain would make me happy. How much would boost increase .5psi-1psi realistically ?
 


Just tune it and put in some poly mounts/shift kit.

Leave the stock pulley.

That'll really wake the car up.

Also, do the vent mod that most 04+ guys do...and toss an aeroforce gauge in there.

I'd have it read KR and something else.
 


Clever. Anyways, how do I see the level of KR using the Torque app?

Edit: Nevermind, I found it.
 
Last edited:


Never said you were kidding. Just wanted a quick response which I feel would have been easy enough without smart replies. Not too hard to just point someone in the right direction. And to the original poster, sorry for cluttering up your thread with my pointless question. My apologies.


Mr. Clutter.
 
2007GPGTSC said:
Applicaion :

2007
Pontiac
GP GT S/C
100k mileage

Mods:
Intake
NGK TR55's
ZZP 10+mm wires
180* Tstat
ZZP 3" Cat'd DP
ZZP Plog - I made this choice budget wise because I am not building a track car simply a budget DD with some cojones

I know this post has probably been answered somewhere on the 100+ pages of forum info - although I would like some new input.

Just needs some facts no hating, just hard facts of what else I need to do to safely drop to a 3.6 pulley or lower while minimizing KR obviously - I know the gain will not be jaw dropping just want my DD to run purdy.

Keep in mind I have never scanned for KR and have no idea what it may be registering. Honestly I have no idea how to scan for KR with out an aftermarket gauge ect. quite frankly I have no desire to put an aftermarket cluster in. How shall I check for KR with out doing so ?

Thanks for your input !
Click to expand...

I have similar mods plus a tune from Overkill and I run a 3.5" on my 2007 GT with no knock. I however do have 94 octane and an in car tune.
 
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