New header back exhaust. Dyno numbers and 1/4 mile times

[Bosworth Audio]

We just got done making our prototype exhaust for the F50 Q45 with impressive gains

The first round is a 2.25" true dual header back exhaust, all mandrel bent in mild steel for test purposes. The gains were quite impressive on what was measurable. We couldn't get a true dyno run all the way through because of the automatic in the Q, but where we could measure, 3,500rpms-5,800 rpms showed impressive gains.

Our stock dyno showed 252WHP and 268ft/lbs
after the header back showed 264WHP and 281ft/lbs

We couldn't measure the true low end torque, but there is a huge difference which is why we did 1/4 mile times also.

Before:
60' 1.976 @ 32.42638mph
330' 5.972 @ 57.41428mph
660' (1/8) 9.352 @ 73.85625mph
1000' 12.267 @ 84.51481mph
1/4 14.726 @ 92.36089mph


After
60' 1.714 @ 35.06204mph
330' 5.514 @ 59.80051mph
660' (1/8) 8.78 @ 76.33515mph
1000' 11.612 @ 87.08392mph
1/4 13.992 @ 95.14817mph

We're going to try a 2.5" mandrel header back also soon and also look into building headers as these numbers were with a cracked drivers side exhaust manifold and 94,000 miles on our 2002 Q45 test mule with staggered 20" wheels and 275 tires out back.

If there is interest, we will be creating a bolt on kit to replace the front y-pipe setup and the rear section that can be created in stainless or coated mild steel.

[mcrews]

so there were no cats?

have an 02Q45 also. the resonator cracked about 130k. I installed an x-pipe.
I also had a cracked header around 150k.

[jltibbs]

MC,

Is that a common issue? I have seen a few F50's stopping in w/ CEL on; P0171, P0173, or P0420, all sounding as if they have exhaust leaks in the manifold or piping. Seems as though a stainless cat back might be in greater demand.

[gracekiz]

this is the VIP section ya f***! send that 2 the other forum.. admin this

[mcrews]

gracekiz........well now you have 8 total posts. geee. welcome.
And who are you again?
Because the attitude reflected in your 8th post could be indicative of some serious anti-social behavior. Maybe you need to pay attention.....jltibbs IS the VIP mod.

[mcrews]

MC,

Is that a common issue? I have seen a few F50's stopping in w/ CEL on; P0171, P0173, or P0420, all sounding as if they have exhaust leaks in the manifold or piping. Seems as though a stainless cat back might be in greater demand.

I had the driver side exahust manifold/header crack and the resonator.
Both seemed to be design-related.
THe resonator just had too much wieght on it from the exhaust mounts being too far away (imho)
I didn't get to look at the exhaust manifold/header but I have also heard of several other 02F50 owners having a driver side leak.
I thouht the p0420 was a bad #2 o2 sensor? I replaced both back o2 sensors when I got that code.

[gracekiz]

lol i had a lil momment. its ok buddy. u will b fine.. why r u going to put this topic on the VIP

[jltibbs]

this is the VIP section ya f***! send that 2 the other forum.. admin this

jltibbs IS the VIP mod.

lol i had a lil momment. its ok buddy. u will b fine.. why r u going to put this topic on the VIP

jltibbs IS the VIP mod.

Basically, once you make your way around the forums, you'll understand why your statement is irrelevant. The Q45 Forum is an amazing plethora of knowledge; completely based off of the purist form of the vehicles, not modified. They boil down to load and speed ratings of the tires, replacing OEM wheels with OEM wheels after a few years due to usage. So, any type of modification away from stock is usually frowned upon and either moved here, or removed from the boards. I will continue my part by assisting you in any way that I can, as long as you let me do so : )

I had the driver side exahust manifold/header crack and the resonator.
Both seemed to be design-related.
THe resonator just had too much wieght on it from the exhaust mounts being too far away (imho)
I didn't get to look at the exhaust manifold/header but I have also heard of several other 02F50 owners having a driver side leak.
I thouht the p0420 was a bad #2 o2 sensor? I replaced both back o2 sensors when I got that code.

Catalyst efficiency below threshold can be either the oxygen sensor or cat. 90% of the time, it's the O2. Just possible to be either way. Usually the cat leads to lack of power.

[mcrews]

"gracekiz wrote:
lol i had a lil momment. its ok buddy. u will b fine.. why r u going to put this topic on the VIP"

jltibbs, gracekiz has a point.....don't vippers just gut the engine, transmission and exhaust, and just do 'still art' .........tee heee heeeee......I crack my self up....... .

jltibbs, YOu`point is well made. Exhaust mod is just as important to the vipper as it is to the modder. And when a guy like bosworth is doing the whole enchallada...he can post here.

[Q45er]

@ gracekiz if you really know vip,you should know that pretty much all VIP cars have exhaust upgrades check out the venders Junction Produce, Aim Gain, Fabulous, to name a few look at ther product line and you will see exhaust! So do a little research first bro.

Bosworth thats awsome! Pics please I would like to see the work! my F50 has 4 cats!! auuuuuugh!
Going to start a exhast project in 2011 just have tips for now.

[jltibbs]

Bos, I think you should look a doing these not only for the performance aspect, but also the sheer improvement over OEM. If you can get these into some sort of production, we can talk to the admin about you signing up for the fabricators market.

Also, I am still in need of upgrading/changing my exhaust. I have the exact plans for what I want done, but don't trust anyone around here to do the work.

[BLACKonBLACK98]

without pics i don't see the point. better look as good as it works.

[jltibbs]

[Bosworth Audio]

damn, I forgot to post back with some info. wait a couple days and I'll have pics and videos as well as my full interior redo, new wheels, trunk setup, etc. just waiting on airbags and bogy kit. but it's already dropped 2" all the way around on Vertini Hennessey wherels