ARH headers dyno / track results

[Avenger]

Well,just wanted to report my own experience with longtubes. Setup is Whipple 2.3 with 3.0" upper and 4# lower. Return fuel system with intank Walbros and 60lb/hr injectors running VP MS109 race fuel.

Baseline run on a Mustang Dyno with stock manifold and O/R Magnaflow X, car made 611whp / 573wtq SAE at 11.7:1 AFR. We then installed a set of 1 3/4" x 2 1/2" ARH longtubes along with the matching O/R X-pipe and added a bit more fuel to make it safer. Timing remained the same at 23deg. Car made 639whp / 587wtq at 11.3:1 AFR.

Pretty happy with a 28whp/14wtq gain !! Off to the track now !

TRACK RESULTS UPDATE:

For the record, car lost 1psi boost. Fitment is great using stock K-member. Only thing is you have to shim the K-member brace but that's it !

Just got back from the track. Previous best at that track was 10.56 @ 132.1mph. First run of the day, crossed the traps at a much higher than usual RPM so I was anxious the get the slip. Picked up the slip, 10.52 @ 135.7 with a crappy 60ft ! I launched a bit better on the following run and it went 10.44 @ 135.6 (still quite a bit left on the table). Car probably has 10.2X in it with a solid launch and a not-so-friendly driver.

The damn thing back halves like there's no tomorrow ! I'm loving it and would recommend this mod to anyone looking to make their setup more efficient ! You can count me as a longtubes believer now !

Mustang Cobra Whipple 2.3 + ARH ([email protected]) Pont-Rouge - Car Videos on StreetFire

 

[JustaGT]

Nice track times. And I have the same headers waiting to be installed so I'm glad to read the good improvements!

 

[fiveoh2go]

For the record, car lost 1psi boost. Fitment is great using stock K-member. Only thing is you have to shim the K-member brace but that's it !

Can you elaborate a little more on this? Any pics of the install?

 

[gabe1530]

awesome gains especially on the track!

 

[Avenger]

Sorry, I don,t have any pics of the install but it was pretty easy once the K-member was out of the way. All in all, it took my friend and I roughly 8 hours from start to finish.

Here's a vid of the car on the dyno

2003 Cobra on the dyno - YouTube

 

[cbr repsol]

nice increase.

 

[Termilvr]

Can you elaborate a little more on this? Any pics of the install?

i would also like to know more, what size, i have some 1 3/4 and dont want to shim anything

 

[RTCOBRA2964]

i would also like to know more, what size, i have some 1 3/4 and dont want to shim anything

I believe you just use some stacked washers to shim it. That's how mine is done.

 

[cobra=trouble]

Do you have to shim on kooks.1 3/4.with stock k member ?..with.3.in collector?

 

[Termilvr]

I believe you just use some stacked washers to shim it. That's how mine is done.

hopefully i don't have to do that, if so i will be :fm:

 

[va boy]

Terrific gains, I'm on the fence about headers with my TS install coming soon. Thanks for your report!

 

[fiveoh2go]

OP, how much shimming of the K-member was required to gain enough clearance for the headers? What did you use to shim the K-member out?

 

[Avenger]

Fitment is great with the stock K-member, no need to shim the K-member itself. Only thing is I had to add about 1/2" washers between the K-member and the brace that crosses below the transmission. Many people throw that brace out anyway so I wouldn't lose sleep over it.

 

[Bruha]

Nice!

Is it just me, or does that track look pretty dangerous!! No retaining walls, and it looked very narrow.

Maybe it is just me...

 

[Termilvr]

what catback do you have?

 

[Avenger]

what catback do you have?

My catback is a Magnaflow.

 

[Termilvr]

My catback is a Magnaflow.

can you make a rev/take off's/fly-by's? that will be my exact setup.