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2005-2009 Saleen Mustang For all S281, S302, H281 and H302 models based on the Ford S-197 Mustang platform, with the exception of the S302 PJ (see below). Be sure to specify year, model and equipment if asking for help.

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  #1  
Old 12-15-2008
xxxscimitarxxx xxxscimitarxxx is offline
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Default stuttering on 06 Mustang GT with series VI and 475 kit

Hi to all

06 Mustang GT auto (37k mls) with series VI saleen SC, 475 kit, 3.4" pulley, and sct tune

with my car being in the UK its not that easy to find anyone who knows what they are doing with these packages so hoping l can eliminate some theories on my problem before finding a shop

heres what l have

general running is good at smooth econo driving levels. When given a little bit more lively throttle It still accelerates ok and I can hear the whooot of the blower kick in.

but when l feel like giving it some large it still accellerates but seems to stutter, and the stutter seems to sound like its coming from the blower

Im guessing it could also be pinking and if so it could just be a timing thing

or something as simple as plugs

it also seems temperature dependant...problem is much worse until its fully heated up...a lot noisier ....more like a clatter

im using premium 97 octance and assume the SCT tune is working fine

I guess l could also be hitting the rev limiter....but while its similar it doesnt feel quite like that

the engine runs fine but the noises occur when lm boosting it
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  #2  
Old 12-15-2008
67fire 67fire is offline
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Someone else probably has a better idea on this yet here goes...
With the 97 Octane, I find it hard to believe that it is pinging.
(Depending on the tune)
It could be an ignition problem...
How long has the blower been on the car?
Has the oil been changed often?
Synthetic oil?
Twin screw superchargers, have bearings on each rotor.
If the bearings or the housing is worn, the rotors could be hitting each other. (NOT GOOD!)

Again, not an expert. Just a lot of experience with blowers.

Eric
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  #3  
Old 12-15-2008
Big Top Gt Big Top Gt is offline
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I'd be curious as to how healthy the fuel pump is.

With those mods and a stock fuel pump, that'd explain the issue. That's assuming you don't have an aftermarket fuel pump, of course.

Personally, I have a JDM Engineering GT500 fuel pump setup. You'll need a retune to get the most out of them, but otherwise it's a simple plug and play affair.

Not sure if this helps, but hopefully it's a start. :)
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  #4  
Old 12-16-2008
risaleen risaleen is offline
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I live in the states but I have had 2 supercharged saleens with my current being a 2006 extreme.

i agree the fuel should not be an issue, and hopefully the tune is ok.

If it is the blower internals i think you would have already destroyed the blower.

I have seen the air flow create a stutter issue (from intake maf), as well as the vacuum line routing to the fuel rail/boost valve.

I travel to london / fleet once a quarter on average. If I have some time I would be happy to look things over.

Do you have any recordings of the sounds. I ask because usually with pinging it gets worse with heat. Piston slap would be more of a cold issue.

Have you looked at your plugs? Do you know which ones you are running?

Also do you have any CEL/ses lights?
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  #5  
Old 12-16-2008
xxxscimitarxxx xxxscimitarxxx is offline
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Default Thanks so far guys

I bought the car from US with the SC on it, and as far as lm aware from the docs, the car was aftermarket fitted with the saleen 475 bhp ''kit'' + the 3.4" pulley, but lm not sure if the ''kit'' comes with an upgraded fuel pump? (will check)

Kit was fitted by saleen authorized ford dealer who also serviced it for previous owner. Ive done 3500 since last service so its up for an oil change but oil is clear.

unfortunately cant check any other details with previous US owner as we had a falling out over some after market wheels and tyres that were supposed to have been shipped separately from car and never arrived (never sent more like as he never provided me with shipping info)....anyway

no check lights coming on at all....will look at the plugs and vaccum lines....intake is the one that came with the car (assume with saleen kit) plus a big ole filter (pic)

Further on what it runs like...this stutter is only under ''foot to the floor load'' while driving....if l raise the revs slowly or fast while stationary it goes smooth all the way before it gets to rev limiter

risaleen....next time you coming let me know but hopefully will have it sorted by then...but at least buy you a drink if youre anywhere near London and l happen to be in UK at same time

Big top and 67....thanks for knowlegable advice....all welcome especially in UK
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  #6  
Old 12-16-2008
jymontoya jymontoya is offline
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when you say SCT tune, do you mean it was custom tuned, or you used the boxed SCT tuner?
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  #7  
Old 12-16-2008
Big Top Gt Big Top Gt is offline
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No worries. I'm glad to at least TRY to help. :D

I'm wondering about the vacuum line routing now that someone else mentioned it. In looking at your photos, I have a different line setup.

JDM Engineering, a New Jersey based Saleen specialist, recommends you don't route the bypass to the stock location.

I'll get you a picture of how they recommend it.

Again, not sure if it helps, but I prefer to rule out the cheap things first, before we star throwing your money at it. :D
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  #8  
Old 12-16-2008
Big Top Gt Big Top Gt is offline
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I tried to upload a bigger picture, but it seems the website automatically resizes them. :(


Last edited by Big Top Gt; 12-16-2008 at 04:57 PM.
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  #9  
Old 12-17-2008
xxxscimitarxxx xxxscimitarxxx is offline
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Default Thanks again guys

finally found a reputable company in UK that knows what they are looking at

www.boatwright.co.uk

so cars going in for a full service, diagnostic, and dyno

and will get the xcal checked while there

merry christmas to all... safe (fast ) driving, and a happy new year

Dave
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  #10  
Old 12-17-2008
67fire 67fire is offline
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Please tell everyone here what they find out. So that others with a similar situation, can learn.
Wishing you a simple/ inexpensive solution.
TIA,

Eric
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  #11  
Old 12-17-2008
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Is the 97 octane you're running a leaded or unleaded petrol?
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  #12  
Old 12-18-2008
xxxscimitarxxx xxxscimitarxxx is offline
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Default re stutter...will post results

will try and get a before and after vid/rec of the prob, as well as what the service guys and dyno find

re leaded or unleaded.....unleaded
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  #13  
Old 12-23-2008
CRF118R CRF118R is offline
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I have an 06 Extreme and had a similar problem, almost like someone is at the back plugging the exhaust in repetition. It started out only having that problem under harder acceleration but progressively got worse. I have had a lot of other problems with the car as far as boost but it seems that along the way the plugs went bad. The dealer swapped the original Autolites out for Ford Motorcraft and problem solved! That and the tensioner pulley mod and the car is a rocketship that finally hits 12+ psi and no more stutter. One other problem I had after purchasing the car was a hesitation under full throttle/ off throttle for shift/ then full throttle again, and at that full throttle there was a brief hesitation. It drove me nuts and I finally had the dealer do something. They sent the box to Saleen and in fact I wasn't crazy, they reprogrammed the delay between full and off and it was night and day. Hope some of this rant helps with your problems. Good luck.

P.S. the car needs to go. 3700 (yes 3700) miles $45,900! (80 new) Real E car #89. Never seen rain or bad roads. Covered in the garage. 1 owner.
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  #14  
Old 12-24-2008
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my saleen box of trix will be looked over by this UK service firm. Apparently they really do know what they are looking at

and as for plugs.....lm going to havem replaced in the service regardless of neccesity, but what plug grade would you guys reccomend if not stock GT plugs

as for tensioner pulley mod....l have read about this....and it does sound like a thing to do to belt slip related stutter....Ive heard this is a workshop mod to the stock pulley, or is this a piece of kit l can get but off the shelf?
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  #15  
Old 12-24-2008
CRF118R CRF118R is offline
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Saleen makes a new tensioner for these cars but won't warranty the old ones. The dealer can also modify the stock one by removing the stopper which lets the pulley move further in to tighten the belt and keep it from slipping. I have not heard of anyone having the same problem on an SC as they only produce around half the boost as the Es but I would do the mod just in case.
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  #16  
Old 12-24-2008
ultamax ultamax is offline
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I re-read the your original post and the issue is more clear to me now. You may have the 475 kit, but the 3.4 pulley changes the whole scenario. Your tune likely, or should have, accounted for the added boost. This means 3 things for you: (1.) upgraded fuel system, such as a boost-a-pump, is a must do if not already done, (2.) your just looking at belt slip from the added boost, and (3.) go ahead and do the vacuum line upgrade as seen below or on Brenspeed's website under Saleen upgrades. I'm speaking from first-hand experience, but please always keep in mind that most of us are not seasoned engineers or mechanics. I'm simply relating a situation on my own vehicle that appears to be very much the same.

Haven't seen Saleen's tensioner upgrade personally, but I heard it is some sort of bracket. There are also upgraded tensioner setups from other companies in the market that have produced positive results. Brenspeed and JDM, among others, each sell a version of this upgrade. Of course, there is always the tensioner tab modification mentioned below. Three means of getting to a similar goal. Stock SCs may not commonly experience this issue, but upgrading the pulley, even with sorter belts, can lead to it as well. Good luck, and let us know how yours makes out.

Lastly, check your boost gauge (or replace if necessary), as the 3.4 pulley should put you somewhere in the 8-10 psi range now. Also, a colder plug is a great idea if that hasn't already been done. You asked about which plugs below, but it is difficult to say without knowing what you have in there now. I'm using an HTO as found in Brenspeed's packages. Btw, they have outstanding customer service in case you're looking for a parts source. They have provided kits for two of my cars and include free tune upgrades down the road as you add/purchase additional parts - not to mention they are a certified Speedlab, in addition to JDM.

Last edited by ultamax; 01-14-2009 at 05:00 PM.
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  #17  
Old 01-14-2009
xxxscimitarxxx xxxscimitarxxx is offline
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Default thanks again guys

car is going to be serviced this weekend. The service center owner says it might need to have the ECU remapped by saleen, but l will mention to him about the other items you have suggsted below

1 check see what fuel pump lve got

2 remove belt tensioner tag

3 run a colder plug

4 do the brenspeed vaccum line mod

cheers to all....will let you know what the results are

Dave
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  #18  
Old 01-14-2009
ultamax ultamax is offline
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You may want to consider the outcome of a Saleen remap with the 3.4 pulley and 97 octane fuel, not sure what they do with it. I'd also ask the local service center to help you update your parts/upgrades list in case you call for a custom tune.
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  #19  
Old 01-15-2009
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wiggywigton wiggywigton is offline
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I am thinking that you need a custom tune based on the 97 octane fuel.I also have the 475 upgrade and was having fuel issues (check engine light). Come to find out it just needed the custom tune (from Techco). I have a Diablo Predator though. I am in no way an expert.

If you ever come over to Germany please send me an e-mail. My Saleen will be here the end of Feb but I don't plan on driving it until summer. It would be great to get them on the autobahn together.
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  #20  
Old 01-15-2009
xxxscimitarxxx xxxscimitarxxx is offline
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Default Hi again

I couldnt find the info on the brenspeed site re the vac mod but they sent it to me .....

it simply comes down to what you see in the pic attached ( This is for info only and i take no responsibility for what you do with it....Please ask Brenspeed for details)

also ive re attached pics of my vac lines.......

they are not like the brenspeed layout .....

so lm thinking heres a problem that could seriously relate to my stutter ....along with plugs, fuel pump, SCT tune, ECU remap.....hmmmmm.....l should have bought a fiat
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  #21  
Old 01-15-2009
ultamax ultamax is offline
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A Fiat? lol Don't get too frustrated just yet. The previous owner added/changed some things and obviously didn't finish. Most of the mods we've suggested are reasonably priced and should acutally make your car faster, or at least more responsive so you can use the power at-hand.
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  #22  
Old 01-15-2009
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Id almost be will to bet its the spark plugs. Get a new set of Autolite HTO's gapped at .030"
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  #23  
Old 11-04-2021
Ronnies281sc Ronnies281sc is offline
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I had the same problem in my 06s281sc after the stage3 upgrade. I didn't install the new colder plugs(not the same as factory). Instant fix after replacing them. I GUARANTEE thats your problem.
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  #24  
Old 11-04-2021
Ronnies281sc Ronnies281sc is offline
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How do u gap the htu plugs?
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  #25  
Old 02-22-2022
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Jason @ 281m Jason @ 281m is offline
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Quote:
Originally Posted by Ronnies281sc View Post
How do u gap the htu plugs?
You need to buy a gapping tool. Ive seen them on ebay and Amazon...if not steeda sells a decent one. Take your time and gap in small increments.
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