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s550_kratos

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Getting conflicting information
What PSI/load should my car be reading with the 3.33 grip tec pulley?
What is the correct belt size?
I tried the 102" in the second hole left to right and Lund says im not getting appropriate boost/load only 10-11 psi

Before I lose my mind please share any knowledge if you know the answers lol
What is the appropriate boost/load on 3.33 and which belt and bolt position with the 4 options left to right

This is the datalog i sent Lund:



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andrewtac

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I had similar issues when going down in pulley size, not getting the psi I expected. I went to the 3.375 and was expecting 12+; on the data logs using inferred psi it looked to be around 10. I put in a gauge and saw around 12 when I was at the track. I chased lost pressure for a while. I got a tighter belt, did a leak check on the piping, and so on. I was looking for a problem I am pretty sure was never there. I have a 3.30 pulley I might run, but want to get back to the track and dial it in some before going for broke.

If the tensioner is tight you are probably not getting belt slip. I think I have the same belt maybe one size bigger on mine. Have you ran the car? Where are you reading the boost from?
 
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s550_kratos

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I just ordered a boost gauge. My tuner is Lund and they are going off the datalog. Apparently I have no PSI/boost increase when going from the 3.6 to 3.33. Im trying to establish what the PSI should be, the proper belt size, and which hole position the pulley should be in left to right out of the four options.

I had similar issues when going down in pulley size, not getting the psi I expected. I went to the 3.375 and was expecting 12+; on the data logs using inferred psi it looked to be around 10. I put in a gauge and saw around 12 when I was at the track. I chased lost pressure for a while. I got a tighter belt, did a leak check on the piping, and so on. I was looking for a problem I am pretty sure was never there. I have a 3.30 pulley I might run, but want to get back to the track and dial it in some before going for broke.

If the tensioner is tight you are probably not getting belt slip. I think I have the same belt maybe one size bigger on mine. Have you ran the car? Where are you reading the boost from?
 

andrewtac

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I just ordered a boost gauge. My tuner is Lund and they are going off the datalog. Apparently I have no PSI/boost increase when going from the 3.6 to 3.33. Im trying to establish what the PSI should be, the proper belt size, and which hole position the pulley should be in left to right out of the four options.
Same tuner as well. The log has inferred pressure. It appears to be close to the gauge but is off a little. I am sub'd as I am I interested in what you find as I also expected more boost than what I am seeing.
 
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s550_kratos

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Same tuner as well. The log has inferred pressure. It appears to be close to the gauge but is off a little. I am sub'd as I am I interested in what you find as I also expected more boost than what I am seeing.
I appreciate all of you, when i say snug that thing is on there lol. i used the 100.5 on the third hole left to right. will datalog and update info in case anyone in the future is searching around for the same answers

Ill get you that datalog info tomorrow
 

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What is your tuner using for inferred boost? Load as a fraction? What is that number at WOT/max RPM please? Also, are you maxing out the factory MAF_in_lbm_per_min reading at 86.688 at somepoint in the pull? If so, at what RPM? Would love to see the log.
 
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s550_kratos

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What is your tuner using for inferred boost? Load as a fraction? What is that number at WOT/max RPM please? Also, are you maxing out the factory MAF_in_lbm_per_min reading at 86.688 at somepoint in the pull? If so, at what RPM? Would love to see the log.
Hey brother the datalog is in my OP thread, I will PM you link as well, thank you for your knowledge and time
 
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s550_kratos

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What is your tuner using for inferred boost? Load as a fraction? What is that number at WOT/max RPM please? Also, are you maxing out the factory MAF_in_lbm_per_min reading at 86.688 at somepoint in the pull? If so, at what RPM? Would love to see the log.

I have a new log too now that i got the 100 belt on.

 
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s550_kratos

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What is your tuner using for inferred boost? Load as a fraction? What is that number at WOT/max RPM please? Also, are you maxing out the factory MAF_in_lbm_per_min reading at 86.688 at somepoint in the pull? If so, at what RPM? Would love to see the log.
Hey brother just wondering if you were able to review that new datalog
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