RPI pulley and Dinan exhaust dyno done

cjm6 · 1st April 2008, 02:20

Somewhat dissappointed in my dyno results when adding these two parts. 478rwhp 349rwtq. My AA exhaust w/o a pulley was 480rwhp 349rwtq. I didnt dyno again when I removed the exhaust so I cant say the actualy gain from the pulley and exhaust. I was expecting mufflers+pulley to make more power then just the AA exhaust. I am happy with the sound though. The dinan exhaust is a good combo with the headers. This was on a dynojet so a pulley gain should have been measured correct?

ThisFlyGuy · 1st April 2008, 02:35

why'd you switch from the AA exhaust?

G ///McGregor K · 1st April 2008, 02:36

Crazy, I'm kind of surprised. Are you selling your exhaust? If so, I might be interested.

onesixeight · 1st April 2008, 02:40

that's very surprising...

I'd certainly be interested in your AA exhaust if it's for sale

cjm6 · 1st April 2008, 02:46

Its already been sold. I took the AA exhaust off for two reasons
1. it was louder than I wanted in my only car once I added headers
2. with the headers and no cats setup there is a lag in throttle response(if you do a search there are better explanations)

cjm6 · 1st April 2008, 05:07

I got a chance to open it up a few times on my way home from the gym. It definitely feels faster even with 3 people in the car. The two passengers have been in the car many times and also said it feels faster. It must have picked up a decent amount of midrange. I didnt pick up the car until they were closing so Ill get them to send me a chart with AA setup and pulley/dinan setup.

///Marshall · 1st April 2008, 07:37

Quote:

Originally Posted by cjm6

Somewhat dissappointed in my dyno results when adding these two parts. 478rwhp 349rwtq. My AA exhaust w/o a pulley was 480rwhp 349rwtq. I didnt dyno again when I removed the exhaust so I cant say the actualy gain from the pulley and exhaust. I was expecting mufflers+pulley to make more power then just the AA exhaust. I am happy with the sound though. The dinan exhaust is a good combo with the headers. This was on a dynojet so a pulley gain should have been measured correct?

Honestly, I'm not sure if it would measure or not. I personally haven't
been witness to a dyno that has shown an increase in numbers from a pulley.
I've speculated that a dynojet could show them due to it measuring
hp/tq from accelerating a drum. There are a few dynos on the board
that have shown increases.

It's too bad you didn't have a Dinan only run. Correct me if I'm wrong
but doesn't the AA exhaust include an x-pipe? Did you keep this?

cjm6 · 1st April 2008, 07:50

Quote:

Originally Posted by ///Marshall

It's too bad you didn't have a Dinan only run. Correct me if I'm wrong
but doesn't the AA exhaust include an x-pipe? Did you keep this?

The AA exhaust is a sec. cat delete, x pipe and mufflers. I sold it together and put my full stock exhaust back on. Then added the pulley and dinan mufflers.

I got 10rwhp 10rwtq from AA exhaust before the headers. If you figure I lost that same amount when taking it off with the headers on then I gained 8rwhp and 10rwtq by adding the pulley and dinan mufflers.

onesixeight · 1st April 2008, 08:13

cjm6,

I know you mentioned a lack of throttle response with headers & AA exhaust...

Was the throttle response an issue pre-headers with the AA system?

Thanks!

Black M5 · 1st April 2008, 08:27

Dont you think you got more from your AA setup cuz your cat deleted and had the x pipe?