She's not smoking like a chimney on the dyno anymore. Fingers crossed that the rings are finally safe! We are focusing on driveability today, but will make a few conservative pulls.
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Yesterday went very well overall. The cooling system was put the the ultimate test in the 91 degree humid weather we had. She handled it quite well. That Taurus fan moves some serious air!
As with any dyno day, there always seems to be a little bad with the good.
The good:
- The driveability is excellent now. The car starts fine when hot and idles within 50rpm (900 rpm idle). It does great when on and off the gas in a parking lot and doesn't show any signs of randomally wanting to stall. I'll still have to see how it does with cold starts. Some adjustment may be necessary there.
- There is no excessive smoking on the dyno. She puffs a very tiny bit on decel, but it's hardly noticeable. The breather doesn't puff visible smoke at all. I think the rings are happy. I'll be doing an oil change this week.
- Nothing blew up or failed. That's always a win.
The bad:
- I'm still having a boost problem. I thought it was due to the boost leak at the blow off valve, but the engine still isn't making boost off the wastegate like it should be.
The possible culprits could be a bad gate diaphragm, backpressure issues, as well as needing a higher rate spring in the gate. Frank, the tuner at PSI, thinks there is a definite backpressure problem. He blames the 2.5" catback and mufflers. We would increase the boost, but the car wouldn't make anymore power. His suggestion was to install an electric exhaust cutout if I'm interested in seeing how much power the car is really capable of making. I like how quiet and unassuming my car is, so a cutout would be a nice way to let the car scream, but only when I want it to. That will be a winter project. I'll need to fab a Y pipe and wire it up.
On his Mustang dyno, the car made 600/600 at 15 psi. Max power was only at 5300 rpm, which apparently is another sign that there are backpressure issues.
Despite the issues, which really aren't a big deal at all, the car rips. We took it for a drive to confirm the driveability. I rowed through the first few gears and could help but smile and nearly giggle. I can finally enjoy the car for the rest of the year. I'll shoot for big numbers in the winter. An exhaust cutout and probably some menthol injection will be on the horizon to get me close to that 800hp range on 20-22psi.
I plan to go on a nice cruise later tonight.
As with any dyno day, there always seems to be a little bad with the good.
The good:
- The driveability is excellent now. The car starts fine when hot and idles within 50rpm (900 rpm idle). It does great when on and off the gas in a parking lot and doesn't show any signs of randomally wanting to stall. I'll still have to see how it does with cold starts. Some adjustment may be necessary there.
- There is no excessive smoking on the dyno. She puffs a very tiny bit on decel, but it's hardly noticeable. The breather doesn't puff visible smoke at all. I think the rings are happy. I'll be doing an oil change this week.
- Nothing blew up or failed. That's always a win.
The bad:
- I'm still having a boost problem. I thought it was due to the boost leak at the blow off valve, but the engine still isn't making boost off the wastegate like it should be.
The possible culprits could be a bad gate diaphragm, backpressure issues, as well as needing a higher rate spring in the gate. Frank, the tuner at PSI, thinks there is a definite backpressure problem. He blames the 2.5" catback and mufflers. We would increase the boost, but the car wouldn't make anymore power. His suggestion was to install an electric exhaust cutout if I'm interested in seeing how much power the car is really capable of making. I like how quiet and unassuming my car is, so a cutout would be a nice way to let the car scream, but only when I want it to. That will be a winter project. I'll need to fab a Y pipe and wire it up.
On his Mustang dyno, the car made 600/600 at 15 psi. Max power was only at 5300 rpm, which apparently is another sign that there are backpressure issues.
Despite the issues, which really aren't a big deal at all, the car rips. We took it for a drive to confirm the driveability. I rowed through the first few gears and could help but smile and nearly giggle. I can finally enjoy the car for the rest of the year. I'll shoot for big numbers in the winter. An exhaust cutout and probably some menthol injection will be on the horizon to get me close to that 800hp range on 20-22psi.
I plan to go on a nice cruise later tonight.
Yesterday went very well overall.
An exhaust cutout, and probably some menthol injection will be on the horizon to get me close to that 800hp range on 20-22psi.
I plan to go on a nice cruise later tonight.
Well good for you. Despite the persistent low boost bug, it looks like one of us had a better day than the other one did.
And....
Isn't an "exhaust cutout" that hole they put in your throat as a result of too much menthol injection?
Let people say what they will about lengthy worded updates, and replies. I prefer to read the story that goes with the pics, as opposed to "here are some pics, enjoy."
That does say something about the fact that I caught your word usage issues.
Hah! Frigging autocorrect. I didn't even notice that typo. I wonder if the car could benefit from a little nicotine though. Hmm...Well good for you. Despite the persistent low boost bug, it looks like one of us had a better day than the other one did.
And....
Isn't an "exhaust cutout" that hole they put in your throat as a result of too much menthol injection?
Let people say what they will about lengthy worded updates, and replies. I prefer to read the story that goes with the pics, as opposed to "here are some pics, enjoy."
That does say something about the fact that I caught your word usage issues.
I'll see if I can get the go pro mounted somewhere for the ride tonight.
squeak93
15 Year Member
VERY NICE! Glad to see hard work pay off and someone being able to enjoy a nice example of a Fox.
Sit back and enjoy the car now!
Sit back and enjoy the car now!
Why are the HP & TQ numbers different from the first time at the same amount of boost? Is it the Mustang Dyno? The previous tuning session was done at All Out with Kris, right? And now you went to a different shop? The first tuning session you got 680HP/657ft-lb @ 15PSI on washed cylinders and now your getting 600hp/600tq @15psi on a healthy engine. Why is that you think? I would assume you had mufflers on your car for both dyno sessions.
The difference is partially because of the dyno. Mustang dynos are known as heartbreak dynos because they read lower than other dynos. I don't know how much lower they read than the Dynocom dyno at All Out.
The other difference is that that 600hp was only at 5300 rpm, compared to 5900 previously. For whatever reason, it doesn't want to make more power above that right now. The back to back dyno runs in 91 degree weather could also be a factor. It was in the 60s the last time the car was out. The air filter was also connected this time, whatever that's worth. It is interesting that the torque numbers went up a decent amount though. Frank said the car should be making a lot more torque and it's not because of the backpressure issue.
Too many variables from switching dynos to know for sure. I use it as a tool, so as long as it's the same dyno next time, I'll know that things are moving in the right direction after making changes.
The other difference is that that 600hp was only at 5300 rpm, compared to 5900 previously. For whatever reason, it doesn't want to make more power above that right now. The back to back dyno runs in 91 degree weather could also be a factor. It was in the 60s the last time the car was out. The air filter was also connected this time, whatever that's worth. It is interesting that the torque numbers went up a decent amount though. Frank said the car should be making a lot more torque and it's not because of the backpressure issue.
Too many variables from switching dynos to know for sure. I use it as a tool, so as long as it's the same dyno next time, I'll know that things are moving in the right direction after making changes.
I am surprised of the back pressure problem. I have a few more cubes on a similar turb0 and it makes boost to the moon.
Where are my manners, first off congrats to you on a good running car and a successful dyno tune.
Now back to the little things. What size headers and exhaust do you have? Do you have cats? Don't other people make good numbers with a full exhaust and a turbo like @GroverDill ? I just don't see cutouts being enjoyable and your car is too classy to sound like a dragster. I'm not the smartest about big HP turbo cars so I'm trying to wrap my head around the logic.
Now back to the little things. What size headers and exhaust do you have? Do you have cats? Don't other people make good numbers with a full exhaust and a turbo like @GroverDill ? I just don't see cutouts being enjoyable and your car is too classy to sound like a dragster. I'm not the smartest about big HP turbo cars so I'm trying to wrap my head around the logic.
I agree with you guys that it may not be solely a backpressure issue. First thing will be checking the wastegate diaphragm. I might have messed it up when I was replacing the spring or something.
The headers are 1-3/4" to a 3.5" downpipe, to a 3" dual Y pipe and then into a 2.5" Magnaflow catback.
@GroverDill, what wastegate spring size are you running?
The headers are 1-3/4" to a 3.5" downpipe, to a 3" dual Y pipe and then into a 2.5" Magnaflow catback.
@GroverDill, what wastegate spring size are you running?
tial 44 with a 15 psi spring. I even have less downpipe.
1 3/4" headers, 3" down to a 3" Y into dual 3" non chambered mufflers ( forget the brand, a maganflow knock off I think )
1 3/4" headers, 3" down to a 3" Y into dual 3" non chambered mufflers ( forget the brand, a maganflow knock off I think )
Yea. That's interesting and definitely contests the backpressure issue theory.
I was only seeing about 6lbs on the 10lb spring.
My only other thought besides wastegate issues could be my cx racing intercooler. We talk about this being a potential issue before.
I was only seeing about 6lbs on the 10lb spring.
My only other thought besides wastegate issues could be my cx racing intercooler. We talk about this being a potential issue before.
Blah blah blahhhhh. 
I'm going to check the gate first for potential issues and also up the spring size. The fact that I'm only seeing 6 psi on the 10 psi spring is a little concerning. I'll measure the pressure directly off the compressor housing to determine if the intercooler is causing issues for me.
What I really need to do also is measure backpressure at the turbo as well. That's easier said than done though.
I'm going to check the gate first for potential issues and also up the spring size. The fact that I'm only seeing 6 psi on the 10 psi spring is a little concerning. I'll measure the pressure directly off the compressor housing to determine if the intercooler is causing issues for me.
What I really need to do also is measure backpressure at the turbo as well. That's easier said than done though.
I'll agree that the exhaust is hurting a bunch, a friend picked up .2 in the eighth mile going from a full 4" pipe out the side right by the rear tire, to a 4" fender exit.
The cutout is the perfect solution for your car, i also would be surprised if the intercooler was the problem, just because it is cheap doesnt make it junk, people have made a ton more power with them.
The cutout is the perfect solution for your car, i also would be surprised if the intercooler was the problem, just because it is cheap doesnt make it junk, people have made a ton more power with them.
