[all4bspinnin]

Well... the car seems to have trouble outrunning cars that i believe i should be out running... i remember with the tune the car had trouble holding boost on the highend.. culprit??

i just hit 40k miles... think it could be the plugs???

basically, the car feels like its going pretty quick but i should be outrunning these cars pretty bad if im really making "344" like the dyno said...

i need to do a compression check... can i do this? the dealor can do this too right?

...im about to upgrade to an fp red and i just wanna make sure the car is running 100% and these people are just lying when we go to the track

a friend said i puffed black smoke when i took off

just another thing... it seemed like my car was faster on the old tune... but the dyno said i made power throughout the entire rpm...

[Hitman83]

You can do the plugs and a compression test yourself. At 40k you;re due anyway so now's the time. Plan on 2-3hrs for a first timer.

[TheLimitedProject]

To be honest, I think your dyno numbers are exaggerated. What's your basis for saying that you should be 'outrunning' certain cars? Just your dyno numbers versus theirs? 344whp/361wtq on the VF39 without meth...

If it isn't the numbers themselves and your car really isn't running well, get some data logs and do a comp test.

edit: BTW, the VF39 can't hold a lot of boost at redline... it'll taper off for sure.

[jermdeez]

yea you'd be doing like 280-290 at most id guess on a mustang dyno. What cars are you trying to outrun?

[WolfPlayer]

Exactly. No way your are making 344. People tried to tell you this when you posted your results. The VF39 cannot make 344whp. The turbo is just not capable of flowing that much air. It is theoretically impossible. Additionally, the stock injectors would have totally been too small for this much power on 93 octane (no race gas, no meth, etc). I think what is happening now is that you are finally realizing the reality of your dyno results. All of this is JMHO. So, take that for what it is worth.

t

[ablair544]

the old tune probably felt faster because the power was not linear...it probably spiked hard and then just tappered of so it seemed faster, that is the case with me just thought id throw that out there

[all4bspinnin]

well... an srt-4 with a boost controller, with the boost set to around 22psi, hardpipe, exhause with cutout that supposedly dyno'd 290ish to the wheels gave me a run for the money until 4th then i started pulling away...

this pisses me off...

i agree that my numbers were a little too high... i called b/s on it when i drove off the dyno... im going to visit topspeed and have a more experienced tuner mess with the #'s...

so basically, lets really not focus on the cars numbers but rather why it isnt rocking these cars a little harder... i bought some autolite iridiums... any advice on these? gap to .030 or do not install?

would the plugs cause my car to be that much slower...

also, where do i get the device to check the compression...

[C.J.]

im surprised a 300whp SRT4 did not walk you on the big end to be honest, mostly b/c with your mods I would guess your sitting at around 300whp yourself on any other dyno

[all4bspinnin]

ok....

thanks for the feedback...

so what do you think about the autolite spark plugs.... they are supposed to be stock replacements

[ninjaboy76]

Well honestly I don't think I would be messing around with autolite spark plugs, but I would imagine they will work. Personnally I would be purchasing some NGKs or Denso plugs. And honestly a well tuned and running SRT4 will give you a decent run from a roll. Those cars have a very capable top end.

All you need to do to test compression is purchase a compression tester. They can be purchased at just about any automotive store or even sears in the tool area.

You might also want to do a boost leak test as well. If you have any boost leaks, this will cause your car to pull timing and make you slower.

[all4bspinnin]

Originally Posted by ninjaboy76

Well honestly I don't think I would be messing around with autolite spark plugs, but I would imagine they will work. Personnally I would be purchasing some NGKs or Denso plugs. And honestly a well tuned and running SRT4 will give you a decent run from a roll. Those cars have a very capable top end.

All you need to do to test compression is purchase a compression tester. They can be purchased at just about any automotive store or even sears in the tool area.

You might also want to do a boost leak test as well. If you have any boost leaks, this will cause your car to pull timing and make you slower.

cool, thanks for the info,

im pretty sure its not a boost leak (thank God), checked everything under the sun... so im cool on that one...

as an update for the plugs... the autolites were the new XP iridium's with are their new "high performance plug"... the box is made to look extreme ... the plugs ran fine, smoothed out the car a little bit... the old plugs were def pretty well used up.. the top had a bit of corrosion on it... iirc... maybe you spark plug guru's can take a peek at these plugs and see if they are pretty good...

here's a link: Autolite :: Products : XP Xtreme Performance Spark Plugs


but basically, id still prefer an NGK but these are performing pretty well from what i can tell... we'll have to see...

[WolfPlayer]

You want NGK LFR7AIX plugs: One step colder Iridiums.

Do not gap Iridium plugs. You will damage them. Again, DO NOT gap iridium plugs.

The NGKs are better than the Denso plugs - IMHO.

t

[Ryan_west06]

There is no way the srt-4 was pushing 22 lbs.... Anything after 21lb it will be blowing out air. I use to own a skittle so im speaking from experience.

[all4bspinnin]

Originally Posted by Ryan_west06

There is no way the srt-4 was pushing 22 lbs.... Anything after 21lb it will be blowing out air. I use to own a skittle so im speaking from experience.

im pretty sure he said 22 lbs.... he wasnt the smartest skittle owner on earth, he told me he had already blown the motor once

wanna see the video?

[all4bspinnin]

Originally Posted by WolfPlayer

You want NGK LFR7AIX plugs: One step colder Iridiums.

Do not gap Iridium plugs. You will damage them. Again, DO NOT gap iridium plugs.

The NGKs are better than the Denso plugs - IMHO.

t

i heard to stay stock heat range until i up the turbo...

these autolites are running pretty well so far...