427 Pulley upgrade

[Wharf Rat]

Here is the before/after dynosheet from my Roush pulley upgrade on my otherwise stock 07 427R.

The stock tune in my car was way off or angry about something. The AFR was about 10:1 to 10.5:1. We datalogged it and it had about 33 degrees of timing and the fuel trim was dumping 15% extra fuel into it . I was surprized it put down as much as it did as crappy as it was running. We did 3 runs and datalogged the last 2 and they were all the same. The place I dyno sells gobs of Stage 3s and 427Rs and they install tons of these Roushchargers. The dyno operator said he had never seen one be off like that and they are almost always 12:1 across the board.

Anyhow, fast forward 3 days and a pulley swap & ECM upgrade later and everything is good again. AFR was 12:1 straight across the board. I picked up not quite 24 rwhp and 19 rwtq from the pulley upgrade. I don't think that's typical but that's what it did. The weather conditions were almost identical both days, too.

Kinda strange! I'm glad I did the upgrade especially since I was limping around with a 10:1 AFR and didn't know it. Sad thing is that it has been raining ever since I got the ECM back so I haven't got to get on it yet.

[03MUSEL]

Is 24rwhp/19rwtq typical gains from the "new" roushcharger pulley up-grade?

[Rangersfan]

Originally Posted by 03MUSEL

Is 24rwhp/19rwtq typical gains from the "new" roushcharger pulley up-grade?

I think it's more from the upgrade to the tune. It's not uncommon to see these cars sporting that much timing from Roush.

[03MUSEL]

thanks Rangersfan,the reason i asked about the hp increase is iam going to buy the up-grade for my gf's car. I wanted to know what kind of #'s to exspect from this mod.

[TPSMak]

Nice numbers but I think 12:1 AFR may be a little lean...

[07_427R]

Wharf Rat: Thanks for posting!!!

Those numbers seem to be within the typical range of others I've seen. I'm still on the fence when it comes to that upgrade. For the price that seems to be a good deal.

[07_427R]

Originally Posted by 07_427R

Wharf Rat: Thanks for posting!!!

Those numbers seem to be within the typical range of others I've seen. I'm still on the fence when it comes to that upgrade. For the price that seems to be a good deal.

Update: So much for the fence. I ordered my pulley upgrade today! Might as well get it over with!!

[03MUSEL]

Originally Posted by 07_427R

Update: So much for the fence. I ordered my pulley upgrade today! Might as well get it over with!!

where did you order it from? and if you don't mind what did you pay? iam ready to buy one... i thought stage3 said $340.00 delivered.

[07roushgt]

Originally Posted by Rangersfan

I think it's more from the upgrade to the tune.

x2

the pulley size is not that much smaller to get the HP increase. you are buying an updated tune more than a new pulley. if the new pulley would be put on a custom tuned car the HP difference would be VERY VERY minimal.

[07_427R]

Originally Posted by 03MUSEL

where did you order it from? and if you don't mind what did you pay? iam ready to buy one... i thought stage3 said $340.00 delivered.

$320.00 with Stage 3 discount!

[03MUSEL]

Originally Posted by 07_427R

$320.00 with Stage 3 discount!

THANKS, HOW DO YOU GET THE DISCOUNT?

[07_427R]

Originally Posted by 03MUSEL

THANKS, HOW DO YOU GET THE DISCOUNT?

Email Stage3 Motorsports and tell you you belong to FNSweet and am interested in the discounts arranged thru FNsweet and would like to do business with them and they will send you a password to enter there website and that will show all discounts while your signed into there site. You will use your email address and password they give you to get into there site once they set it up!!

Chris

[03MUSEL]

Thanks 07 427r.