Sick Cobra

[RedfireSVT]

might be time for a leakdown test. just a thought.....i've seen an engine let go with 2.8 pulley and no tune in about a week of driving. it would be a miracle if you haven't hurt that motor by now. not trying to bash you but you're being pretty irresponsible with your car in my opinion. hope it works out for ya.

 

[frank5o]

So ya think my rings are shot? Why dose everybody always assume the worst?

 

[RedfireSVT]

because putting a 2.8 pulley on your car and not getting it tuned is extremely detrimental to your engine. it's just a fact. if you're gonna mod your car and not do it the right way you should expect the worst. i hope everything is alright but there's enough to be concerned.

 

[frank5o]

Dude, I drove the car three times on the canned pulley tune. If you read this entire thread, it is filled with statements similar to yours . I said the car was rich, and it was having spark blow out ignition issues. I'm not stupid. The car feels extremly fast. I went 12.40 when it was stock, and the car feels much stronger then it did when it was stock...... I just want educated responses. IE, "this happened to me", or "I've seen this happen",ect., ect.....Sorry but its geting allitle ridiculus......Now lets talk about Clayton dynos..................

 

[Ex President]

I'm not baggin ya dude..... I'd be the last one qualified to do so, but the car will probably "feel extremely fast" till it blows up..... You can't assume everything is "all gravy" just cause it "feels extremely fast".

Tune should always be the first on your list when pulley'ing up, especially since you don't have a wide band in the car to let you know wtf is going on.

 

[frank5o]

Holy crap!!!! Is any one reading my posts!!!! The car was tuned today!!!!!People stop telling me my car is gonna vaporize!!!!!!!
The tunner said my maf was pegging out at 5900rpm, but it's still safe. The AF ratio from the final tune never go's above 12.0!!!!! I wan't to know why my maf is pegging out with just a 2.8 pulley, and if any one has been on a clayton (brand name), or eddy curent style dyno......... My motor is gonna, or is blown up, is not very much of a response.

 

[Ex President]

I read the post..... Not bashing you.

What I, "and i think the others who responded" were worried about was the 4-5 days in between the mods and tune.

 

[Fdawg97lx]

Holy crap!!!! Is any one reading my posts!!!! The car was tuned today!!!!!People stop telling me my car is gonna vaporize!!!!!!!
The tunner said my maf was pegging out at 5900rpm, but it's still safe. The AF ratio from the final tune never go's above 12.0!!!!! I wan't to know why my maf is pegging out with just a 2.8 pulley, and if any one has been on a clayton (brand name), or eddy curent style dyno......... My motor is gonna, or is blown up, is not very much of a response.

some cars peg the maf with just a 2.8 upper and some dont. every car is different. when i had just a 2.8 upper my stock maf was ok but there another local guy who had to change his out so it varies from car to car.

cant help you with the dyno as i've only been dyno'd on a dyno-jet. i'd also reccomend doing a leakdown test and probably a compression test. if not for diagnosing the low numbers just for peace of mind w 40k+. i'm planning on doing one soon too just to know everything is ok, i'm at 31k right now.

Frank

 

[frank5o]

Well the tuner said my numbers were low becuse I was pegging the maf. The #'s from the tuning session were uncorrected. Anybody thats been on a dyno knows that 98% of all tuners uses corrected numbers. So I'm alittle confused......

 

[AmazonTuning]

Im not familiar with the Clayton dyno but if it is an eddy current dyno it will read lower than a Dyno Jet unless it is an eddy current DynoJet..SAE or STD is not relavant with an eddy current dyno..did this dyno have a built in weather station?

when using an eddy current dyno the proper load of the vehicle is factored into the dyno run thus you will see drivablilty issues that would show up on the street..these issues may not show up on an inertia dyno..

these cars will have different results when compared to each other with the same mods..

if the data is showing that you are pegging at a certain rpm then you are and a MAF extender product or bigger MAF should be used..either produce is a good choice but your tuner may have a preference


12AF is on the high side..Rick likes to tune for around mids 11s..

 

[frank5o]

LINN@AMAZON, Thanks for the info........So pegging out the maf will cause low performance?

 

[AmazonTuning]

it can not be tuned to its max performance...how much experience does your tuner have with these specific cars?

 

[frank5o]

LINN, I don't think my tuner has a ton of experience with 03-04 cobras, he tunes all sorts of stuff, GM, carb motor's, grand nationals, he's not new to forced induction. He told me to get a MAFia, and he chould get the h.p up.

 

[jm@ReischePerf]

Well the tuner said my numbers were low becuse I was pegging the maf...

I kind of doubt this if your MAF is pegging at 5900, it's unlikely that there is much more power after 6K anyway. The Eaton can't really move enough air to maintain boost in the upper bands so I would imagine most of us see peak HP before that. I would definitely do something about the MAF regardless because you'll get a better tune out of it but I would be really surprised to see major HP gains. Someone correct me if I'm wrong here.

 

[frank5o]

He also said that he did'nt want to mess with my timing because the maf is pegging, so the timing was left at 19*. So basicly all that was changed in my tune was the AF ratio. So when I get the pegging problem fixed he will mess with the timing........If I go back.

The car feels great. Wayyy better then with the canned pulley tune. At WOT the engine rev's alot quicker and the car pulls hard all the way to 6000rpm. Even though the HP #'s say the car is the same as stock, It feels much faster. I don't know what to do. I think I'm gonna just go to the track soon, and see what it will run. If the car go's low 12's/ high 11's at 117, that should be a better indication of power.

 

[Fdawg97lx]

He also said that he did'nt want to mess with my timing because the maf is pegging, so the timing was left at 19*. So basicly all that was changed in my tune was the AF ratio. So when I get the pegging problem fixed he will mess with the timing........If I go back.

The car feels great. Wayyy better then with the canned pulley tune. At WOT the engine rev's alot quicker and the car pulls hard all the way to 6000rpm. Even though the HP #'s say the car is the same as stock, It feels much faster. I don't know what to do. I think I'm gonna just go to the track soon, and see what it will run. If the car go's low 12's/ high 11's at 117, that should be a better indication of power.

take care of the maf and have him put the timing up to 22*-23* and see what it makes for power. your right though, if the car is running the correct times then it doesnt really matter what numbers it is putting down

 

[AmazonTuning]

if he was datalogging the dyno runs during tuning then the data should tell the story..get a MAFia and a tune with higher timing and lower AF-mids 11s..

you should see better results once you get that done

 

[Mr Incredible]

I've heard Claytons read low. Your tuner got you 25 hp and 40 lbft that sounds great. What is normal for a pullied Cobra? If you add say 15% for the dyno reading low you would be up over 460. At least it wasn't running lean. If you're really worried, why not do as leakdown test? If it's running good then don't be worried about the numbers. It sounds like it would be interests to get a mafia if you're pegging the MAF.

 

[Fdawg97lx]

I've heard Claytons read low. Your tuner got you 25 hp and 40 lbft that sounds great. What is normal for a pullied Cobra?

i picked up 58 rwhp and 92 rwtq