Ferrari Mailing List: Re: 458 with aftermarket exhaust

[Martin Stark (MStark]

My '87 USA TR made 330hp (+/- 1 hp) sans cats on dyno runs a year apart. That's about a 15% loss depending on which top line hp figure you use. I've got to believe that the TR's drop gears and lay shaft gears eat a big chunk of hp compared to a classic front engine/rear drive setup with a straight through (input shaft to output shaft) 1:1 top gear.

Thomas Reynolds wrote:

Well, here's where my math "skills" are called into play. Â562-450=112 hp loss. ÂThat's 19.9% loss from a claimed 562. ÂI've always heard that a driveline loss to RWP of anywhere from 15 to maybe 25% is always possible. Â25% of 562 would be a loss of 140.5 hp.

Tom Reynolds

Tulsa, OK

--- On Mon, 11/22/10, Mike Fleischer <themightytoe [at] gmail.com> wrote:

From: Mike Fleischer <themightytoe [at] gmail.com>
Subject: Re: [Ferrari] 458 with aftermarket exhaust
To: "Tom Reynolds" <kjtar [at] att.net>
Cc: "The FerrariList" <ferrari [at] ferrarilist.com>
Date: Monday, November 22, 2010, 1:55 AM

Ah yeah I call bullshit on that.

450 hp out a motor that claims 562 at the crank? Thats a 25% driveline loss... I don't think so. At most its probably 18%, but more likely around 15%... So it should see 480-490 at the wheels, and likely is under-rated from the factory a bit anyhow (at least most American muscle engines are).

On 11/21/2010 6:36 PM, LS wrote:

Indeed, I was fully expecting to see no mention of dyno gains or something on the order of 10-15rwhp gains.

A guy I know and some mods done to a 355 and the cost was about $12k for full header, cats, mufflers, etc.

The dyno shop was "out of order" that day conveniently.

LS

---

From: Peter Pless <ferrarilist [at] pless.com.au>
To: LS <lashdeep [at] yahoo.com>
Cc: The FerrariList <ferrari [at] ferrarilist.com>
Sent: Sun, November 21, 2010 7:29:35 PM
Subject: Re: [Ferrari] 458 with aftermarket exhaust

Anyone else surprised at the power gains? Ferrari doesnât normally leave that much on the table.

Â

From: LS [mailto:lashdeep [at] yahoo.com]
Sent: Monday, 22 November 2010 11:28 AM
To: Peter Pless
Cc: The FerrariList
Subject: Re: [Ferrari] 458 with aftermarket exhaust

Â

Great sound and apparently awesome power gains...I wonder how much?

$15k?

LS

Â

Â

---

From: Fellippe Galletta <fellippe.galletta [at] gmail.com>
To: LS <lashdeep [at] yahoo.com>
Cc: The FerrariList <ferrari [at] ferrarilist.com>
Sent: Sun, November 21, 2010 12:37:44 PM
Subject: [Ferrari] 458 with aftermarket exhaust

http://www.youtube.com/watch?v=mtp2TGhKY0s

Â

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