**Official Pulley Thread**

[XxBoostinxX]

Looking for everyone to post their pulley size, psi, horsepower, and torque! Let's see what everyone is working with!

[Nightstalker]

NA 300hp...mine is a slug.

[XxBoostinxX]

Originally Posted by Nightstalker

NA 300hp...mine is a slug.

THAT'S a **** lie!

[Nightstalker]

Originally Posted by XxBoostinxX

THAT'S a **** lie!

Okay, you caught me... 302/289 <---- it has a nice small block ring to it, don't you think?

[XxBoostinxX]

Originally Posted by Nightstalker

Okay, you caught me... 302/289 <---- it has a nice small block ring to it, don't you think?

Yeah but when you combine the two its about 1000 rwhp!

[06281E]

I'm running the OEM Extreme 2.87 pulley with an Innovators 10% overdrive crank pulley. making 13-15psi depending on mother nature and so far hit 547whp on 91oct on a 105 degree day.. Come winter i am going back to the dyno and see if i can get that number up a little higher.

[OneQwkStang]

Originally Posted by XxBoostinxX

Looking for everyone to post their pulley size, psi, horsepower, and torque! Let's see what everyone is working with!

Add your own first....

[XxBoostinxX]

Originally Posted by OneQwkStang

Add your own first....

Completely stock! Its never been on a dyno so have zero idea! I have a 3.4, techco, sct tuner and 39 lb/hr injectors I bought back in May but still need the gt500 pumps and tune. I need to quit buying other parts, lol.

[OneQwkStang]

3.2 @ 11-12 psi making 497 rwhp and 472 rwtq.

[Nightstalker]

Originally Posted by 06281E

I'm running the OEM Extreme 2.87 pulley with an Innovators 10% overdrive crank pulley. making 13-15psi depending on mother nature and so far hit 547whp on 91oct on a 105 degree day.. Come winter i am going back to the dyno and see if i can get that number up a little higher.

Nice. I'm running the same pullies you are, but still on the break in tune for almost two years. (Haven't had the time or inclination to get it final tuned). It made 510/502 if I remember correctly. Guy is very conservative, so it has a ton more to offer, I believe...

[XxBoostinxX]

Originally Posted by 06281E

I'm running the OEM Extreme 2.87 pulley with an Innovators 10% overdrive crank pulley. making 13-15psi depending on mother nature and so far hit 547whp on 91oct on a 105 degree day.. Come winter i am going back to the dyno and see if i can get that number up a little higher.

Those are good numbers for being that hot! I would like to see how it would do on a 60-75 degree day!

Originally Posted by OneQwkStang

3.2 @ 11-12 psi making 497 rwhp and 472 rwtq.

Very nice! That's right on the money where I wanna be. I might have to trade my 3.4 for a 3.2.....

Originally Posted by Nightstalker

Nice. I'm running the same pullies you are, but still on the break in tune for almost two years. (Haven't had the time or inclination to get it final tuned). It made 510/502 if I remember correctly. Guy is very conservative, so it has a ton more to offer, I believe...

Still on the break in?!? C'mon Steve, ya need to drive that thing!

[06281E]

Originally Posted by XxBoostinxX

Those are good numbers for being that hot! I would like to see how it would do on a 60-75 degree day!

You and me both!!

[Nightstalker]

Originally Posted by XxBoostinxX

Those are good numbers for being that hot! I would like to see how it would do on a 60-75 degree day!

Very nice! That's right on the money where I wanna be. I might have to trade my 3.4 for a 3.2.....

Still on the break in?!? C'mon Steve, ya need to drive that thing!

Kinda hard to when you have a Boss 302 parked next to it...

[Char259]

3.2. 10psi. 475/454

[XxBoostinxX]

Originally Posted by Nightstalker

Kinda hard to when you have a Boss 302 parked next to it...

Decisions decisions.....lol

Originally Posted by Char259

3.2. 10psi. 475/454

Nice bro! How conservative is the tune?

[Char259]

Afr is 11.2 - 11.4 at Wot. Mike Roush likes to play it safe

[Char259]

Originally Posted by OneQwkStang

3.2 @ 11-12 psi making 497 rwhp and 472 rwtq.

I didn't think you could get that much psi or rwhp out of a 3.2 pulley. you are walking a fine line there

[OneQwkStang]

Originally Posted by Char259

I didn't think you could get that much psi or rwhp out of a 3.2 pulley. you are walking a fine line there

There is a number of factors that affect boost levels, altitude, engine and exhaust modifications, and air quality play a role how boost levels may differ per pulley size.
Pulley size vs boost rating are :

2.95 14-15 psi
3.00 13-14 psi
3.20 11-12 psi
3.40 9-10 psi
3.60 7-8 psi
3.80 5-6 psi

You can view any aftermarket parts companys site that sells these pulleys, and they all claim 11-12 psi.

http://www.281motorsports.com/produc...oducts_id=2857

I think you need to find out where your extra psi of boost went...my rwhp numbers are only 22 rwhp more than yours...you don't think your walking the same line...LOL

Some of the mods I have that would affect rwhp that I don't see listed in your sig are, Kooks LT and Catted X pipe, Saleen Extreme dual pump fuel system, 39 lb injectors, Saleen Ultimate CAI, HTO spark plugs tuned with a conservative 11.5 AFR at WOT on 91 pump gas. I don't recall what my timing is at, but the tune is conservative. The car made more but was backed down to keep it safe.

Here is a video for your viewing pleasure...lol
http://www.youtube.com/watch?v=cDW-od88yuM&feature=plcp

[Char259]

I don't like to think about my fine line I'm tip toeing on, lol

Yeah that's an interesting read. I was in the 9s and once I replaced my tensioner I saw 10s. To be honest, I don't know how high in the tens it goes. I've seen 10s on guage but then gotta look out front to make sure I don't run anybody over. So it could be **** close to 11. I wanted to record my readings at the track of afr and boost levels with the go-pro, but didn't.

As far as mods, it looks like we are matching minus the headers. Don't have those yet

[seelye76]

Originally Posted by Char259

3.2. 10psi. 475/454

What RPM did you run up to?

[Char259]

He plays cast bottom ends pretty safe , he only spun it to 6100

[seelye76]

You would see 10-15 more by going out to 6500.

[OneQwkStang]

Originally Posted by Char259

I don't like to think about my fine line I'm tip toeing on, lol

Yeah that's an interesting read. I was in the 9s and once I replaced my tensioner I saw 10s. To be honest, I don't know how high in the tens it goes. I've seen 10s on guage but then gotta look out front to make sure I don't run anybody over. So it could be **** close to 11. I wanted to record my readings at the track of afr and boost levels with the go-pro, but didn't.

As far as mods, it looks like we are matching minus the headers. Don't have those yet

I've heard of cars blowing engines with 450 rwhp, and I know a number running well over 500 rwhp on the stock bottom end. I think it comes down to a good tune and not over reving the stock bottom end.

I replaced the stock tensioner with the UPR, very nice piece.

I have a hard time watching the AEM wideband, boost, tach and track too.

My extra rwhp and rwtq is likely from the headers...for 22 rwhp save your money LOL

You can always measure your pulley to confirm its size.

[06saleenvert]

Here are my dyno graphs with a 3.4 pulley, these were before the UPR Tensioner and Kooks long tubes with a catted H-pipe. The mods at the time of the dyno pulls were a 3.4 pulley, v10 water pump pulley, HT0 spark plugs, KB BAP, Saleen Extreme Cold Air Kit, and a Brenspeed tune.

[fungirl]

Metco 3.6, 10 psi, dyno'd @ 489.4 HP & 473.5 torque (or 444.9 RWHP & 430.5 wheel torque)

95 degrees, 91 octane with 75,000 miles on her!

[Nightstalker]

Originally Posted by fungirl

Metco 3.6, 10 psi, dyno'd @ 489.4 HP & 473.5 torque (or 444.9 RWHP & 430.5 wheel torque)

95 degrees, 91 octane with 75,000 miles on her!

80# injectors? A bit steep for your setup. I would think 39# would be suitable, 54# with more boost. You're not experiencing any fuel pressure irregularities or anything?

[fungirl]

Originally Posted by Nightstalker

80# injectors? A bit steep for your setup. I would think 39# would be suitable, 54# with more boost. You're not experiencing any fuel pressure irregularities or anything?

Yeah, a few people in here have told me that as well. I didn't have any issues for over a year. Just this last couple months it's been stalling at or near idle.

[OneQwkStang]

Originally Posted by Nightstalker

80# injectors? A bit steep for your setup. I would think 39# would be suitable, 54# with more boost. You're not experiencing any fuel pressure irregularities or anything?

60's would be steep...80's I doubt it..must be a mistake.

[XxBoostinxX]

Originally Posted by Nightstalker

80# injectors? A bit steep for your setup. I would think 39# would be suitable, 54# with more boost. You're not experiencing any fuel pressure irregularities or anything?

Originally Posted by OneQwkStang

60's would be steep...80's I doubt it..must be a mistake.

+1, WAY too much! Get rid of those and get retuned ASAP.

[Nightstalker]

Originally Posted by OneQwkStang

60's would be steep...80's I doubt it..must be a mistake.

I didn't want to sound like a know it all...

[06281E]

Originally Posted by Nightstalker

I didn't want to sound like a know it all...

People have mentioned this to her since the beginning of the posted issues but the shop keeps assuring her i guess that it is fine to have 80lb injectors pushing 440whp.. Probably something they had laying around on the shelf and didnt want to order 39lb ones, can't think of any other reason a shop would do something like that, way overcompensating!

[Nightstalker]

Originally Posted by 06281E

People have mentioned this to her since the beginning of the posted issues but the shop keeps assuring her i guess that it is fine to have 80lb injectors pushing 440whp.. Probably something they had laying around on the shelf and didnt want to order 39lb ones, can't think of any other reason a shop would do something like that, way overcompensating!

I agree. If she had a fuel pressure gauge in her car it would be all over the place. I run 60#, and an no where near exceeding duty cycle. I ran 80# when I was running 16-17 psi, and I think they were too large then.

[fungirl]

Originally Posted by 06281E

People have mentioned this to her since the beginning of the posted issues but the shop keeps assuring her i guess that it is fine to have 80lb injectors pushing 440whp.. Probably something they had laying around on the shelf and didnt want to order 39lb ones, can't think of any other reason a shop would do something like that, way overcompensating!

Honestly, I haven't even asked them about the 80# injectors. The subject hasn't come up and so they haven't been assuring me of anything. I'll definitely ask them about it tomorrow!

I don't know very much about how all this works. But I still don't understand how I didn't have a problem with these injectors for more than a year and only now, in the last 6 weeks, has there been an issue. Is there any explanation for this?

[Nightstalker]

Originally Posted by fungirl

Honestly, I haven't even asked them about the 80# injectors. The subject hasn't come up and so they haven't been assuring me of anything. I'll definitely ask them about it tomorrow!

I don't know very much about how all this works. But I still don't understand how I didn't have a problem with these injectors for more than a year and only now, in the last 6 weeks, has there been an issue. Is there any explanation for this?

It could be any number of things. I wouldn't want to speculate. A dyno tune should expose the culprit.

[wildhorse]

How far is
281 Motorsports
1312 E Orangethorpe Avenue
Fullerton, CA 92831
877) 281-6878
from your house I am sure Jason can help you out.

Also here is what Iam running
GT500 Duel Fuel Pumps
JLT CAI
3.2 Pulley
373 Gears
MGW short throw
Gapped plugs
SCT Tuner/Custom tune on Dynojet
Vacuum Lines
39LB injectors
466 RWHP 421 max torque 11.00 for boost

[fungirl]

Originally Posted by wildhorse

How far is
281 Motorsports
1312 E Orangethorpe Avenue
Fullerton, CA 92831
877) 281-6878
from your house I am sure Jason can help you out.

8.5 hours. Will definitely go there if I'm ever in SoCal again.

[rslater]

466hp on a Mustang Dynameter, with 3.6 pulley, long tubes, catted x, supershaker. It was about 88 degrees out that day.
Also was told that the Mustang Dynameter reads about 30hp less than a Dynojet Meter


mustang dyno.pdf

[OneQwkStang]

No more contributors to this thread?

[Jon]

I made 429/438 SAE and 446/455 STD correction with the dyno pulling 4% (showed 0.96 correction because it was 65* outside) on the 3.4 pulley. It was showing 8-9 psi depending on outside temps with stock manifolds, cats, and pypes mid muffler catback, but then I put on an o/r h pipe and it dropped to around 7.5-8 psi on my autometer pro comp mechanical gauge so I tried another mechanical autometer and the vacuum went from 24-25 at idle to 19-20 at idle but the boost showed the same. Now I'm running a 3.2 pulley and haven't had it back on the dyno yet to confirm boost levels but its only showing around 8.5- 9 psi even with cooler 60 degree night temps here in Florida right now. Anyone have any ideas why it's showing so low?! Only 2 things I can figure is belt slip but the belt is new and I'm running a v10 w/p pulley with a steeda tensioner (but maybe that's the problem since its really a stock tensioner with a plate welded on the arm) or it shows that low with the o/r h and mid mufflers since it has low or no back pressure since the mid mufflers are only resonators.. I'm planning on putting the stock mufflers back on to see if the extra back pressure will show more boost ( not to mention help tone it down a bit cause its ridiculously loud!) anyone else with an o/r exhaust showing low on your gauge?

[Kendog]

If you increase the flow through your engine with larger more efficient intake and exhaust, the pressure will naturally drop, imagine blowing in a straw then a 2 inch pipe your lungs provide the same amount of push but you have less pressure as the output. I would stop worrying about the boost pressure and look at your power output that's what really matters. Do some dyno runs and see if your hp numbers make sense given your setup. Less boost is actually better if your producing the power. Means you have a more efficient setup

[seelye76]

It also looks like you are running to around 6000 rpms based on your numbers. If you took it to 6500 you would get more boost and more HP...probably closer to 475 SAE.

[tbrock]

I live at 5280 and with 3.0 pulley (11 psi), long tubes, jlt cai, 39lb injectors, gt500 fuel pumps, 6.5 lid stock tb, she made 492 HP, 463 tq at 6500 (street tune), race tune was 508, 479 with an afr at 11.4. Stock bottom end, 41k on the motor, 31k since getting blown. I always use good gas when I'm going to run it hard.

[OneQwkStang]

Updates?? Anyone