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Old 03-12-2014, 01:13 PM   #1
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How much power do you think I am making

I have a 03 gt and before I get it on the dyno I was wanting to see if anybody know about how much power I have right now
BBK CAI
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Accel Supercoil kit
Magnaflow Catted Tru-X X-Pipe
Magnaflow Catback Exhaust
Superchip computer chip
4:10 Gears
Short Throw Shifter
Rebuilt 4.6L 2V motor
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Old 03-12-2014, 01:16 PM   #2
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And any ideas on how I can get to at least 305 hp
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Old 03-12-2014, 01:47 PM   #3
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At the wheels? Not going to happen without a motor build or a power adder. As far as your mods, you are probably adding 15-20hp with your exhaust and intake. Not sure about your chip, probably a little more there if its quality but canned tunes aren't exactly the greatest. The CAI and TB are not going to be doing anything without a better plenum, the Accel coils are actually a downgrade from the stock coils.

I'd say you are probably making 240-250 to the wheels as you sit right now.
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Old 03-12-2014, 01:49 PM   #4
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I was thinking about maybe swapping the engine for a cobra engine, or adding a supercharger. Which way do you think is best.
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Old 03-12-2014, 01:52 PM   #5
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I was thinking about maybe swapping the engine for a cobra engine, or adding a supercharger. Which way do you think is best.
With a sc and stock rotating assembly its just a waiting game for the motor.

Depending on year of cobra motor it's still going to take mods to pass 300 whp.

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Old 03-12-2014, 02:02 PM   #6
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Yea I was thinking if I go that route like a 03 or 04 cobra motor
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Old 03-12-2014, 02:29 PM   #7
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Old 03-12-2014, 02:32 PM   #8
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And also I think that the engine was built by the second owner considering the owner that I purchased it from also said that it was built when I bought it it came with all the paperwork on parts, but I am finding so much more. And all other GTs I have ridden in feel nowhere near as powerful. When I bought it the guy said it's pulling a solid 345 hp
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Old 03-12-2014, 02:35 PM   #9
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I doubt it's pulling 345hp but I think it may be pulling at least 300hp
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Old 03-12-2014, 02:38 PM   #10
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Definetly gonna get some spray for it within the next month or so
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Old 03-12-2014, 02:42 PM   #11
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By built do you mean rebuilt again with stock parts or built as I'm forged rods and pistons?


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Old 03-12-2014, 02:48 PM   #12
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By built do you mean rebuilt again with stock parts or built as I'm forged rods and pistons?


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Forged parts
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Old 03-12-2014, 02:50 PM   #13
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By built do you mean rebuilt again with stock parts or built as I'm forged rods and pistons?


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My mechanic also said that it looks like it has been redone forged all parts in engine bay are new and the car feels so much more powerful than the other GTs I have rode in with same bolt ons
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Old 03-12-2014, 03:11 PM   #14
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My mechanic also said that it looks like it has been redone forged all parts in engine bay are new and the car feels so much more powerful than the other GTs I have rode in with same bolt ons
Unless this mechanic built it himself, he's full of ****. Unless he has X-ray vision or something and can see the rods/crank/pistons from the outside of the engine... Also having forged parts will make 0 difference in power if everything else is the same.

Your car feels faster than other GTs because of the 4.10s.
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Old 03-12-2014, 03:18 PM   #15
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Unless this mechanic built it himself, he's full of ****. Unless he has X-ray vision or something and can see the rods/crank/pistons from the outside of the engine... Also having forged parts will make 0 difference in power if everything else is the same.

Your car feels faster than other GTs because of the 4.10s.

No he took the engine apart to see everything that had been done to it. He also said that the previous owners had been building it. I know that forged rods and pistons make zero difference in power that is for if your wanting to run boost I'm just telling you that the car was built before I bought it and the previous owner said it dynoed at 345 which I doubt maybe around 300, I've got to find a dyno near me, but I have ridden in GTs with the same 4:10s and bolt ons and they still don't feel the NEAR as powerful. My GT throws you back in the seat and it is hard to even drive it.
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Old 03-12-2014, 03:21 PM   #16
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There is no way it dynoed 345 and the only way it is doing 300 or close to it is with aftermarket cams. You are missing mods in your mod list or there is something else going on.

So this mechanic pulled the heads off and everything then?
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Old 03-12-2014, 03:26 PM   #17
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Yep he pulled it all apart and checked it out cost me about $500 and it has aftermarket cams from AM. When I bought the car all of this was already done I just listed what I can see and I don't think it ran 345 on dyno that is way to high without boost or spray
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Old 03-12-2014, 03:27 PM   #18
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How much power do you think I am making

Maybe he has pistons that gave him a compression bump?


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Old 03-12-2014, 03:31 PM   #19
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My mechanic said considering what I paid for it with all of the mods on it which total up to about $16,000 that the previous owner had no idea what he was selling it for I paid $7000 I have all the paperwork, but some stuff that is in my car is not on the paperwork. Such as CAI Throttle body Cam and a few other things.
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Old 03-12-2014, 03:35 PM   #20
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What Mods ARE there paperwork for? That would help in seeing what you have


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Old 03-12-2014, 03:35 PM   #21
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Well then you got a good deal and did not list that in the original mod list lol. A cammed 2V with all the bolt ons and stock heads with a proper tune will do anywhere in the 275-300whp range. If it is a stroker with TFS heads then it will make more.

Although with that much in receipts and the owner knowing how much it all cost it makes one wonder why it was sold so cheap.
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Old 03-12-2014, 03:39 PM   #22
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What Mods ARE there paperwork for? That would help in seeing what you have


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All the mods on the paper work are the 4:10 gears and exhaust set up but if you open up the hood there is obviously a CAI and throttle body combo and when you dig even deeper into the engine there is forged pistons and rods and upgraded camshaft which is where I am getting 300 from there is also some other things that were not on paperwork from the body shop that did all work for previous owner I just can't name them off the top of my head
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Old 03-12-2014, 03:52 PM   #23
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All I see in this thread is "My Mechanic said...." "The previous owner said....."

Dyno the car and get some receipts of the work.
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Old 03-12-2014, 03:56 PM   #24
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Why dont you stick it on a dyno. That way you know vs what someone told you. ???

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Old 03-12-2014, 03:58 PM   #25
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All I see in this thread is "My Mechanic said...." "The previous owner said....."

Dyno the car and get some receipts of the work.

That is what I am doing the nearest dyno is a 3 hour drive and I've got to find out when I can go like I said in the title is I just wanted to see what others opinions where before I dynoed it
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Old 03-12-2014, 04:25 PM   #26
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I can tell you that i built my 02 GT with Manley H beam rods, stock crank, and ross pistons (want to say 9:1 ratio) and had the rotating assembly balanced. Had stock PI heads port matched and used stock cams and upper - lower intake.. Put a vortech intercooled charger kit on it with 10 p.s.i and had it tune at a local dyno shop and with all that it put down 415 hp..

And a friend of mine went on a N/A mission with his 03 model GT and buit it with a stroker kit, cant remember the compression ratio, stage 3 heads (cant remeber brand name) and had i think comp stage 3 cams, BBK upper intake and a bigger throttle body and it only put down around 340 hp. thats when i sold mine and didnt want another mustang with a 4.6 engine. They just take too must to make good power. Thank you ford and jesus for bringing back the 5.0!

My 2011 GT with just Steeda CAI, Borla axle back, x-pipe and Lund tune just made 400hp and 389 tourqe on the dyno this past saturday.
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Old 03-12-2014, 04:29 PM   #27
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I can tell you that i built my 02 GT with Manley H beam rods, stock crank, and ross pistons (want to say 9:1 ratio) and had the rotating assembly balanced. Had stock PI heads port matched and used stock cams and upper - lower intake.. Put a vortech intercooled charger kit on it with 10 p.s.i and had it tune at a local dyno shop and with all that it put down 415 hp..

And a friend of mine went on a N/A mission with his 03 model GT and buit it with a stroker kit, cant remember the compression ratio, stage 3 heads (cant remeber brand name) and had i think comp stage 3 cams, BBK upper intake and a bigger throttle body and it only put down around 340 hp. thats when i sold mine and didnt want another mustang with a 4.6 engine. They just take too must to make good power. Thank you ford and jesus for bringing back the 5.0!

Lol that is what I figured thanks for your input I am planning on going forced induction .
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Old 03-12-2014, 05:47 PM   #28
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Originally Posted by knight5.0 View Post
I can tell you that i built my 02 GT with Manley H beam rods, stock crank, and ross pistons (want to say 9:1 ratio) and had the rotating assembly balanced. Had stock PI heads port matched and used stock cams and upper - lower intake.. Put a vortech intercooled charger kit on it with 10 p.s.i and had it tune at a local dyno shop and with all that it put down 415 hp..

And a friend of mine went on a N/A mission with his 03 model GT and buit it with a stroker kit, cant remember the compression ratio, stage 3 heads (cant remeber brand name) and had i think comp stage 3 cams, BBK upper intake and a bigger throttle body and it only put down around 340 hp. thats when i sold mine and didnt want another mustang with a 4.6 engine. They just take too must to make good power. Thank you ford and jesus for bringing back the 5.0!

My 2011 GT with just Steeda CAI, Borla axle back, x-pipe and Lund tune just made 400hp and 389 tourqe on the dyno this past saturday.
Why were you just doing 10 psi? Even a basic S trim can do more than that, turn that sucker up and you would have made a ton more than that if the motor was built well and the tune was good.

But as far as NA, ppl are hitting the 400whp mark with the 2V these days. It does take work... 5.0 stroker, TFS heads, custom cams, eddy intake etc... but it is being done. I mean a 302 stroker needs all that stuff too for 400whp and its cheaper but then you are limited by the glass jaw block. Throw a DART block at the 302 and its about the same money. Honestly for a NA build you should go 351 based stroker or Coyote IMO but some ppl like NA and they want to prove it can be done.
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Old 03-12-2014, 09:29 PM   #29
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Unless this mechanic built it himself, he's full of ****. Unless he has X-ray vision or something and can see the rods/crank/pistons from the outside of the engine... Also having forged parts will make 0 difference in power if everything else is the same.

Your car feels faster than other GTs because of the 4.10s.
+1.... what are your receipts for? People don't know **** and the owner was filling you full of crap so he could make the sale. I told the buyer of my v6 (was a younger kid) it was prolly making around 225-235 hp... lol
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