Dies out at 85

[forcefed3.8's]

We took my friend's stock long block car back to the track last night. It has:
Stock rebuild .030 over pistons, unknown cam with speed pro lifters
The valve job on the heads were whooped, so we put a 40,000 mile set on I had with fresh comp 980's heads are untouched other than springs
TE44 with .63 Precision housing
60 lbs injectors with standard Translator, Extender 104 race chip 25/23 timing
CAS V4 intercooler
3.5" THDP no exhaust
0 pump Vigilante 5 disc full billet trans
Walbro fuel pump, volt booster, hot wire
AC r42ts spark plugs
full tank of Q16
Last week it went 11.69@114 with 21psi and the converter locked in 3rd. The fuel pump was bad (new Walbro bought in May) and it was getting lean at the top of the track 11.7 on the wideband.
We swapped in an old Walbro from 2006 and it went to 10.2 on the wideband.
I started giving it boost. I figured 28 to 30 would be needed to break into the 10's. I got it adjusted to 30psi and 10.7 on the wideband.
Took it to the track.
11.41@115.x 30psi 10.3 AFR, 0 knock, converter locking at 105 It felt flat from 85mph on. I took some fuel out.
11.35@115.x 30psi, 11.1 AFR everything else the same. I took out some boost
11.41@115.x 27psi, 10.9 AFR I figure the converter is dragging it down
11.35@115.7 27psi 11.0AFR no converter lock tried to lower the boost
11.36@116.0x 26.5 psi 11.1 AFR no converter lock car cooled down some.
I tried to lower the boost more, but it is tough to guess with the RJC unit and the stock actuator is turned way in. The up pipe was cool after every run. 60's were all 1.51 to 1.54, 1/8mile was 7.1X @93.7 to 94.1. I figured the car should go 96 in the 1/8 and 119 in the 1/4. It seems like when the digital dash starts flashing 85mph, the car feels labored, it doesn't feel like it is pulling clean. AFR is steady and no knock. Any ideas? The car was a bone stock Limited when he bought it.

 

[streetknight]

Any power log files?

Sent from my DROID2

 

[forcefed3.8's]

No logging. I wish I had. I am thinking it is pulling timing. It is weird that it does it when the 85 starts flashing.

 

[justin84]

I may have missed it but what chip is in the car?

 

[forcefed3.8's]

It has an extender extreme. It is also running 275/60 MT DR's.

 

[forcefed3.8's]

any ideas?

 

[pajo]

+

You might be on the right track if you assume that some timing is pulled back after the flashing 85 - next time out get some power log files it should tell you the truth . Nice cars buy the way - the both of them ..

 

[pontiac69fb]

It appears to be picking up 22 mph from the eighth to the quarter which is on par with the average turbo regal. My best assumption is maybe at boost above 27 psi you are out of the efficiency range of the te-44 turbo so you should optimize your current set-up by ways other than upping the boost to gain mph.

 

[pontiac69fb]

Also you may want to put the car on the dyno and have the horizontal axis set to vehicle speed to see what the power curve looks like maybe at 85mph the torque or hp is on the decline.

 

[forcefed3.8's]

It is going 2 more mph in the 1/8 than at 21psi, but only 1 more in the 1/4.

 

[forcefed3.8's]

Finally got a chance to look into this. I ohm'd the coil pack, 24.63 ohms on 1/4, 11.6 on 2/5, 11.6 on 3/6. I put the coil pack off my 9 sec car on it that ohm'd 11.6 across the board. We wont know what happens until the Friday before Norwalk. I got a fresh set of plugs that ohm'd out good to go in right before the race. He also bought a translator plus so we can adjust timing. Shooting for 30psi and 28deg of timing with Q16. This NE Ohio weather has sucked.