esp3500

OK, many of you probably rember my thread about this car being a turd.

Well here is the update for the rest please read the whole thing and help if you can thanks.

I bought this car because I have been wanting an s197 since I first saw one.

I have a 95 5.0L mustang that runs great but I don't like the body style.

Now I have an 06 that I love how it looks but hate how it runs.



I bought it completaly stock. I then added a roush supercharger.

Still very slow.



I then added the smaller pulley and had it dyno tuned.



it put out 370 hp at the wheels on a mustang dyno ( they said ) 382 hp WCF

it put 327 torque at the wheels 340 torque WCF



I just got back for the track and it ran 8.7's at 82 mph With Slicks on it!!! ( 1/8 th mile of course )

and the rearend gear is stock.



The car feels very smooth and gets good milage, and I checked and I am getting 7psi of boost.



This seems very slow to me, my 95 will run much faster and it is running a centrifugal supercharger instead of the roots, so I thought the roots would make way more torque then this one does. and it only gets about 5 psi of boost.



My 95 had only 300 hp on a dynojet dyno and yet it put out 346 ft lb of torque.



Why is the 2006 putting out more hp than torque?



My tuners say the fuel and ignition are right.



anyone have some comparable hp to E/T anyone have a similar set that has been dynoed on a mustang dyno I can compare to?



what could it be? Cam timing???



I have done a leak down test on the engine ( only 36,000 miles ) and it shows perfect,

all the plugs look fine.

I have cleaned the MAF and the Throttle Body and checked for any leaks. I am at a loss.



Please help if you can



I hate loving this car and hating it at the same time.

I has put me in the poor house and I got nothing in return.

mattstang2007

Those number seem very, very low as you already know. Where did you get it installed and tuned at? My first guess is your tune is way to conservative or just plain sucks. does the belt squeak or anything may e you have some belt slippage? I would go more twords the tune being conservative.

808muscle

8.7 @ 82 ............ something is wrong for sure. The worst 1/8 I have run heat soaked, 88` afternoon heat with two people in the car was 8.1 @ 87. Best is 7.86 @ 90.1

Did you get a new tune from a reputable tuner? Send the dyno logs to a tuner? I think you need another set of eyes looking at your data.

LilRoush

I'd figure out your issue before you trying making it faster (I peaked at you thread about adding nitrous). With just the Roush blower you should be over 400 rwhp. There is something wrong. As suggested, data logging would help alot. It's probably a little thing: sensor reading wrong, need colder plugs, belt slip etc....

ziperhead

If recall I was around 360hp at 6psi so your numbers sound right. Can't recall the torque.

Are you intercooled, what gear you running, auto or manual? What were you 60ft times? How all a tire were you running?

LilRoush

360 was the 6 psi number for the 2001 Roush blower.
Roush listed the S197 M90 set up at 430 hp. With a small pulley on there, it should be seeing that at the wheels with a good tune.

stealth_GT

auto trans with a 3.31 gear? street tires?

Doesn't sound like it's making the most out of the M90 either way..

you'll need cams/LTs and at least 3.73s if not 4.10s to really wake it up...

esp3500

Here is the story about my tune.
First I used the stock roush tune with the 5 psi pulley. It sucked.
Then I added the 7 psi pulley and bught a SCT tuner with Bama tune for this setup. still sucked.
Then I took it to to High spped perfomance and dyno and they dyno tuned it. still the same suck.
I can't believe all three tunes are that far off, so I am thinking something mechanical, because the car was a turd when I bought it, I just thought that was how a stock 4.6 ran and so I took it home and added the supercharger.
What would cause this kind of power loss without having drivability problems. ( I stand corrected. It does have a slight surge from 2000 to 2500 rpm ) but thats it.

also it is a 5 spd with stock 3.55 gears I think.
But my 95 is also, and the difference is night and day.

boss hoss

i have no clue how to help, but totally feel for you... what a nightmare.. damnit!!

kenthicken

I can only go back to the basics, so forgive me if I point out the obvious / things you have already checked:

You are running at least 91 octane?
Is your boost gauge faulty?
You mentioned in the other post, you bought your supercharger used... there may be something wrong with it.