Intermittened power loss (HP)

[05bluestang]

This maybe a long story.
Anyway, when Tillman installed my Techco blower, the engineer from Techco tuning that thing could not get it to make more than ~420whp @ 10psi. They canged coils, plugs and all that good stuff... nothing. All of a sudden the car made 465whp and everybody was happy but did not really know why. I had some issue with a check engine light comming up without code and Tillman (Chris Rose) decided to retune my car. We had it on the dyno and that damn thing would only make 420whp again. We changed plugs and coils to rule that out I also put a new TB and TPS on it, no change. All temps and pressure look normal, for all intense and purpose that thing should laying down between 460 and 480whp. Tillman want's me to come back to go through the wiring since CR thinks there maybe a intermittened short somewhere causing the coil voltage to drop.
I took it home and all of as sudden the car started pulling like crazy. I drive the car (did not take it back for the wiring check yet) and most of the time it pulls like a mule and some days it's noticable down on power.

I'm just looking for second opinions. Anybody have seen / had this problem or have any idea what may cause something like that?

 

[doogie]

Man, can't believe you are still having issues!

Hopefully you can get it sorted out and find the root cause.

 

[05bluestang]

Man, can't believe you are still having issues!

Hopefully you can get it sorted out and find the root cause.

Yup, all it takes is money ...............

 

[trill gear head]

If this problem started after the s/c then I'd look more towards that.

 

[05bluestang]

If this problem started after the s/c then I'd look more towards that.

OK, like what?

 

[trill gear head]

OK, like what?

I honestly have no idea. I'm was just deducting what might be the problem. Perhaps their is something mechanically wrong with it and it only happens every so often.

Do you have belt slippage?

 

[05bluestang]

I honestly have no idea. I'm was just deducting what might be the problem. Perhaps their is something mechanically wrong with it and it only happens every so often.

Do you have belt slippage?

No, no belt slippage. We did a compression test and a leakdown test as well, all good...........
It has to be something stupid, but finding it.......................that's why I'm asking if anybody else may have any ideas.

 

[shawn13]

Does the Techco have a boost bypass like the Saleens ? Maybe thats not working all the time.

 

[BSell]

I'm thinking you all are on the right track, chasing an intermittent electrical problem. Chasing the wiring is the way to go.

If the problem was a mechanical install problem with the s/c, then you should have a consistent power loss, but yours comes and goes...

Fuel pressure held steady or had no change @ 420hp vs. 465?

 

[PNR Welding]

Hey, were gonna have to get together some time. Its good to see some people local that are on the boards. Do you go out to any meets? If you do let me know, me and Chris (cruzin2much) will come up and check out each others cars. He has a F1 procharger making over 900 whp on a 06 GT.

If you cant get the problem solved soon, come with me to my friends place. He tuned my car and got my car to make 650whp on his dyno. He is a good tuner and does really good work. He put my motor together, and also he put Jims motor together too. (Flounderlipps). He had to fix Johnny Lightnings tune and mess ups to his car. My tune is very similiar to yours, so I think he will be able to solve your problems. Let me know when you are available.

 

[GT33]

you said u had a check engine light problem right? could your o2 sensor be bad causing the computer to see a differnt air fuel mix?? idk just throwing some stuff out there. My car did the same thing, felt strong one day and slow the other ended up being the temp the computer would timimg to save the motor. Mine was set at 95 now its 115 and its good.

 

[ZmanM3]

Subscribing.

 

[1lowtoy]

Was boost logged on all of your runs? Can you datalog your intake air temps? Maybe your intercooler pump is flipping out. I would "think" that if you had a short in the power feed to the coils the car would shut off when this problem is happening.

 

[dysan]

Ya know, I just had my motor built by Tillman, 302 stroker set-up, and from time to time I seem to feel the same damn thing. Some times I'll get on it and it just feels like the power ain't there, but other times seems to pull nicely. Please post your findings.

I really wonder if it could be either something in the tune, or a random electrical issue. Maybe a bad ground to the block or something? I've gotta get under my car to check.

 

[05bluestang]

Hey, were gonna have to get together some time. Its good to see some people local that are on the boards. Do you go out to any meets? If you do let me know, me and Chris (cruzin2much) will come up and check out each others cars. He has a F1 procharger making over 900 whp on a 06 GT.

If you cant get the problem solved soon, come with me to my friends place. He tuned my car and got my car to make 650whp on his dyno. He is a good tuner and does really good work. He put my motor together, and also he put Jims motor together too. (Flounderlipps). He had to fix Johnny Lightnings tune and mess ups to his car. My tune is very similiar to yours, so I think he will be able to solve your problems. Let me know when you are available.

send me a pm, we can meet somewhere half way on weekends..............

 

[05bluestang]

you said u had a check engine light problem right? could your o2 sensor be bad causing the computer to see a differnt air fuel mix?? idk just throwing some stuff out there. My car did the same thing, felt strong one day and slow the other ended up being the temp the computer would timimg to save the motor. Mine was set at 95 now its 115 and its good.

hmmm, have to look into the temp thing............thanks

 

[05bluestang]

Was boost logged on all of your runs? Can you datalog your intake air temps? Maybe your intercooler pump is flipping out. I would "think" that if you had a short in the power feed to the coils the car would shut off when this problem is happening.

Boost is around 9-10psi at wot. I'll have to hook up the laptop and see, but looking at my charge air temps, which are taking on the discharge side of the blower, they are pretty consistent and low (between 85 and 125deg/f) depending on outside temp.

I'm thinking it's something stupid that nobody looks at, but finding it is another story...............

 

[05bluestang]

Does the Techco have a boost bypass like the Saleens ? Maybe thats not working all the time.

Yup, it's a butterfly valve with a vacuum operated actuator on the bottom of the blower, I mentioned that to CR @ Tillman, he said that's not it......

 

[69Mach1-409]

If it was the bypass then I'd think it would effect your boost readings too.

Sounds like an electrical issue is about all that is left.. but I'm at a loss as to where or what system.

 

[tillman speed]

The boost is proper, the air flow in # min is proper, the throttle body is fully opening, it's nothing in the tune. Actually our tune file cleared up all of the issues he was having running with the TECHCO tune.

I loaded this same tune file into a "10PSI TECHCO" remote-tune in Miluakee with even the same (CDC3) pcm code the other day and made 482RWHP on a Dynapack. I hear those dynos are a little bit generous, but I think it's probably around the 460RWHP range with only 18 degrees of timing... AFR ratio was pretty flat, little bit of oscillation but stayed between 11.5-12.

05bluestang's tune file shows perfect timing numbers, and even has 63#/min air flow registering through the MAF which would be that of a 475ish RWHP car. The throttle angle goes to 81-82 on the PID which is "full throttle" and we verified by looking into the throttle body that it is indeed fully opening. The bypass is working correctly and the boost readings are spot-on. There's nothing holding him back in the calibration or on the blower.

However, when he was running the TECHCO tune file he would get random misfire codes left and right, and specifically in two banks. As well, it would go into failsafe at 85mph here and there. It doesn't do it anymore with our tune file, however I think maybe there might be random misfire codes that were popping up due to an actual coil voltage problem. We replaced coils and plugs, and it didn't fix it but I think that's where our problem lies. John from TECHCO put in Autolite plugs that WEREN'T GAPPED DOWN out of the box and that's when he made power. It was just really weird. And he didn't get spark blowout at the factory autolite gap! There' something going on in the ignition system in my honest opinion. It's the only thing that can't neccessarily be "datalogged" coil-to-coil to ensure that everything is proper. Just because the spark PID says 18 degrees, and spark source PID says it's going off the correct "borderline knock table" doesn't mean that the car is physically doing that.

Chris