np. i edited my post when i saw post #40.

 

Did you notice any difference in power or acceleration or rev's easier or any other benefit? Or pretty much not noticable?

 

you know, you're right. i first installed the kjr before the sc, and i remember it made for quicker reving and acceleration back when i was na. i now have the jwt fw as well, so it revs and accels even faster.

 

oh okay. cool. I think what I will do is dyno my car before I add any more performance modifications and then I can compare my intake/exhaust/stage 2 to future stage 4... then pulley... etc. I may even try a different exhaust in the future because my current stillen set up is a little TOO stock looking for me.

 

You are not going to see hardly anything from the KJR because of how the dyno reads. But you will probably feel it like you can with a lighter FW.

 

Is it true that the Walbro 255 fuel pump is loud? Somebody that upgraded from the Stillen Stage 3 to the Stage 4 first complaint was that the pump is louder than he expected and he has to use the "radio" to tune the sound out – mind you, his car was already LOUD (Stillen exhaust, intake, etc.) so to hear the fuel pump and complain about it is strange.

Any info on this?

 

Walbro pumps are often times louder than stock, I've noticed this on a few cars, such as Mitsu eclipse and Evo etc..
I have the 255 in my car, and i don't really notice it being much louder.
I guess it depends on the person.

 

Having just got all of my stuff installed (and loving it) I would say that the Walboro 255 is more like a reassuring hum and annoyingly loud ... Although, I can definately see two of them being loud for those big HP boys ...

Hey Tony, I'm only seeing 8.1lbs, do you think this is because of the cats ?? I'm probably gonna get a custom pulley made ...

Colin

 

Yes, running less boost can be directly atributed to high flow cats, a very high flow exhaust, etc...
I even drop boost if i remove my silencer out of my muffler since my exhaust is large piping and non-resonated single exit.

 

Have any of you guys who running stage4 have yours dyno yet?

 

Mine will be dyno'd on the 18th and again on the 21st the reason for twice is that the 21st will be done on the same dyno that I always dyno at so I can do a proper comparison, the 18th day is part of a group dyno day and it's only $55 so what the hell ...

I guess I need to change out my cats then .... maybe I'll do that between the 2 dyno days so that I can compare ...

Colin

 

Yes....unfortunately, the verdict thus far is not so good. Dyno'd mine on a Mustang dyno about two weeks ago (just before my Walbro fuel pump went out) and posted peak #'s of 307 HP and 290 TQ. As I've mentioned in a # of other posts, I'm evidently only making around 6 lbs of boost which is the likely reason for my disappointing dyno #'s. Mine is in the shop right now having the fuel pump replaced and some other things checked to see if the boost problem can be fixed.

 

So, given that Mustang dynos read about 10% low, you are making 337rwhp at 6lbs ... which is pretty good ...

 

337 at 6 lb.s is good... so if you fix your boost then maybe you can make the numbers this stage 4 should be making..... stillen claims 339whp with stage 3 so stage four should be at least 20 hp over that considering the new tune, fuel pump, injectors, and more boost. 360 whp is what I would LOVE to see out of a stage 4 set up.... I think what we're likely to see, however, is 340... which isnt too bad.

 

According to Mac Autosports's website the dyno they use is a Dynojet not a Mustang.

Let me know what they say about fixing the low boost issue.

 

You are on the right track...kinda.

"Stillen claims" Hahaa...my favorite phrase LMAO!!

LOL. nobody ever listens to me...Hahahaha
I said it before and I will say it again. This Stillen SC is good for what it is....a plug and play FI system that will make about 290-330ish whp, No matter what you do to them
We have EXTENSIVE experience with this SC, we have had several different sizes of custom pulleys made, re-tuned the split second box, added a methanol injection system (which will increase octane to 120ish), an intercooler sprayer, bigger injectors, various exhausts, even cams. I am telling you, with this kit you got what you got, no matter what you throw at it, you may see some very minimal gains but you will also see some mods actually loose power, but with this systems belts and pulleys, intercooler, and its overall design, you are all beating your heads against the wall (and possibly wasting alot of money) trying to split hairs and find power in this blower. FYI, no matter what we did, we never saw more than 340 ish WHP from a stock (except for cams) VQ35 motor on a dyna Pack or a Dyno Jet with 91oct. pump gas.
Beware, too much tweaking on this kit can cause too much heat and stress on the motor and be catastrophic....just ask vision619.

Don't get me wrong, I like this Stillen SC, I even have one on one of my cars. It makes a cool noise and it adds some power, but come on, leave it at that, trust me, you will be glad you did.

There's my $.02 cents. I will now step down from my soap box

I'm done......

Good luck all......................

 

Did you port the blower? It works on mustangs and it should add another 25 hp to the motor. Putting a 10 lb pulley would not hurt on 100 octane. You ran your SC on 91 ocatane. I run my stage 2 with a 8 lb pulley on 94 and have no problems at all. Make makes 307 on a 5 AT we will see what it will make with the ported blower, pump, injecter,and piggy backbox update. At the track i will run it on 10 lbs of boost on 100 octane. Why would you run a stage 4 on 91 octane???? No wonder you blew up the engine. Have been running 8 lbs for over 9 months and no problems. We have also bumped the timing by 2 degres as the 5 AT ecu takes timing way in 4th gear. Now my z is an 03 and my ecu has run rich from day one. after the everthing is done it should make 350 to 355 rwhp. Time will tell will post once project is completed.
13.0 @ 105.7 times verified by the Ontario Z club of Ontario. Quickist 5 AT in the club on 19 inch street tires. Have at least 60 passes down the 1/4 mile track with no problems.

 

Thanks for catching this. Mac does use a dynojet and the #'s I posted were from a dynojet NOT a Mustang (my mistake).

I also had the car dyno'd before and after the initial Stage 4 install, which was done at a different shop (which runs a Mustang dyno). This is what led to my confusion. So just to clarify for everyone, the #'s posted before were from a dynojet. However, I also have Stage 4 #'s from my Mustang dyno (Matthews Automotive in Longmont) which were 290 HP and 281 TQ. Should point out that dyno that was run before the Stage 4 install at Matthews Auto, when I had the Stage 2 setup, were 296 HP and 276 TQ.

 

So you lost some HP with the stage 4?

 

Yes........i'm working with the shop that did the install to try figure out what the issue is.