Question for folks running 69mm pulleys on roush setup

[Bioni007]

i also run a 69mm pulley on my roush
I have a shorter belt and a Griptec just in case

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[nnnnnn]

i also run a 69mm pulley on my roush
I have a shorter belt and a Griptec just in case

What kind on numbers are you putting down power wise? how much boost? My goal is to run the maximum boost possible

 

[Bioni007]

What kind on numbers are you putting down power wise? how much boost? My goal is to run the maximum boost possible

long story short….first time at the track my mt82 said bye bye
had my friend rebuild it for me for free so I don’t trust his work to hold this power
I do know that I don’t hook in first or second gear even third
but I did order my mt82 stage 3 from Ben
anyways I say do it Bc at the end of the day I’m not going back to a 75mm or 79mm pulley

 

[hlfbkd420]

Yes it’s on a 2021.

What fuel?

 

[Proshop]

What fuel?

E85, 1050 injectors, return fuel system dual 400 pumps, catless LTH’s and a killer chiller. I really need to update my sig.

 

[Eric5.0]

E85, 1050 injectors, return fuel system dual 400 pumps, catless LTH’s and a killer chiller. I really need to update my sig.

Did your IATs go up considerably and create the need for you to get the killer chiller? I'm considering the 80 to 69 mm as well.

 

[Proshop]

Did your IATs go up considerably and create the need for you to get the killer chiller? I'm considering the 80 to 69 mm as well.

I didn’t see any real changes in IAT2’s after the 69mm. Unfortunately the Roush SC is well known for heat soak and being I live in FL it’s even worse, so that is why I went with the KC.

 

[Stage_3]

E85, 1050 injectors, return fuel system dual 400 pumps, catless LTH’s and a killer chiller. I really need to update my sig.

Wow, very nice!!!
Car must run really strong!

 

[Proshop]

Wow, very nice!!!
Car must run really strong!

She will definitely get up and go. Forgot to add all the suspension mods to that post, it is more race car than the daily driver I bought it for.

 

[Eric5.0]

Hi guys. I have a 2015 and going from an 80mm to either a 72 or 69 in about a week. Can you help me with which belt I need to order for either the 72 or 69? Thank you!

 

[Stage_3]

She will definitely get up and go. Forgot to add all the suspension mods to that post, it is more race car than the daily driver I bought it for.

Very nice. Sounds beastly.
Have you done any 1/4 mile runs at the track?

 

[Proshop]

Very nice. Sounds beastly.
Have you done any 1/4 mile runs at the track?

No unfortunately I had planned on going to the track and putting it on the dyno in January or February and life has just been to busy to do so.

 

[nnnnnn]

Hi guys. I have a 2015 and going from an 80mm to either a 72 or 69 in about a week. Can you help me with which belt I need to order for either the 72 or 69? Thank you!

Anyone running a shorter belt with these setups?
Curious.

I was thinking a bigger idler is the better way to go, maybe 100mm for a 69mm to reduce slack. But for a 72mm, I don't even think you need to change belts but could be wrong.

 

[Proshop]

Anyone running a shorter belt with these setups?
Curious.

I was thinking a bigger idler is the better way to go, maybe 100mm for a 69mm to reduce slack. But for a 72mm, I don't even think you need to change belts but could be wrong.

I know I’m a 2021 but I didn’t change my belt and have had no known issues.

 

[Cory S]

Hi guys. I have a 2015 and going from an 80mm to either a 72 or 69 in about a week. Can you help me with which belt I need to order for either the 72 or 69? Thank you!

I run a 80.6” belt with a 69mm. Stock lower. KO60806

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