upper and lower pulley's and blower life.

[ace32x]

Collecting parts currently to throw on the car here shortly. currently have a custom ground cam a 9.1 lower crank pulley, 2.5 upper, solid isolator coupler, some kooks LT's and a kdi heat exchanger and a nick williams 102 TB that will go on when i port the snout.

what im curious about is blower life in the 1900 with the 9.1 lower and the 2.5 upper. im debating porting the heads and doing valves before everything gets put in and as that would lower the boost some since theres less restriction would bumping up the 9.5 lower and having the 2.5 upper significantly increase bearing wear on the blower vs the 9.1 and 2.5 combo?

and what are we seeing failure points on the bottom end of these things stock? i havent heard of one failing yet so im curious

(will be tuning on 92)

[69NMYSS]

How do you like your KDI H/X? Have you monitored IAT2's and seen a difference?

[ace32x]

Originally Posted by 69NMYSS

How do you like your KDI H/X? Have you monitored IAT2's and seen a difference?

i havent put any of it on yet still compiling parts haha. just has the lower 7% pulley on it atm and the rotofab intake. the cam headers heat exchanger tb and coolant pump and upper pulley are just sitting on my pooltable eating up space.

[Azzkker]

where did you buy your coolant pump from?

[hognutz]

Originally Posted by ace32x

Collecting parts currently to throw on the car here shortly. currently have a custom ground cam a 9.1 lower crank pulley, 2.5 upper, solid isolator coupler, some kooks LT's and a kdi heat exchanger and a nick williams 102 TB that will go on when i port the snout.

what im curious about is blower life in the 1900 with the 9.1 lower and the 2.5 upper. im debating porting the heads and doing valves before everything gets put in and as that would lower the boost some since theres less restriction would bumping up the 9.5 lower and having the 2.5 upper significantly increase bearing wear on the blower vs the 9.1 and 2.5 combo?

and what are we seeing failure points on the bottom end of these things stock? i havent heard of one failing yet so im curious

(will be tuning on 92)

I don't know if I have seen anything other that recomended RPM range for the blower and I don't know how much life is decresed if you go over it.

I am not sure you are factoring in the blower RPM in the equation. both the combo's you posed in are over the recomended blower RPM.

I think you are looking at 23,400 vs 25,500 rpm on those two combo's.

I would rather run the 2.55 and the 8.6 and have a little more rpm out of the motor.

port the heads in my mind if your going this far.

[Meister@Torq]

Anything above 23,000 is not really suggested

Take a look at our belt selection guide and blower rpm sheet:

https://torq.zendesk.com/entries/235...election-Guide

[Stephen12ZL1]

chart is wrong...here is the right one. Look at 9.55" and 10" rpm column...how could they be the same? http://www.lingenfelter.com/sites/li....0%20small.pdf

page 7

[Meister@Torq]

Thanks. Should be fixed

[BLACK10]

We have many Zl1's using that combo you posted. you will also need to run aftermarket idler pulleys to prevent belt slippage.

[Mattzl1]

Originally Posted by ace32x

Collecting parts currently to throw on the car here shortly. currently have a custom ground cam a 9.1 lower crank pulley, 2.5 upper, solid isolator coupler, some kooks LT's and a kdi heat exchanger and a nick williams 102 TB that will go on when i port the snout.

what im curious about is blower life in the 1900 with the 9.1 lower and the 2.5 upper. im debating porting the heads and doing valves before everything gets put in and as that would lower the boost some since theres less restriction would bumping up the 9.5 lower and having the 2.5 upper significantly increase bearing wear on the blower vs the 9.1 and 2.5 combo?

and what are we seeing failure points on the bottom end of these things stock? i havent heard of one failing yet so im curious

(will be tuning on 92)

There is alot of ZL1's out there with the 2.5 and 9.1 combo and that is just over the recomended max RPM range. Lingenfelter used the 2.5 and 9.5 on the car they were making the 760HP and say they have been using that combo on the CTSV for a while. Lower boost from less restriction doesn't mean less power, it just means more efficient power.