New Times - Stock Turbo, Intercooler

[2 QK 4 U]

Last night at test and tune was the perfect example of just that. Testing and tuning.

Pass#1 - Boost/15psi - O2mv, 860s
60'- 1.9031
330'- 5.4701
1/8 ET- 8.5261
1/8 MPH- 80.05
1/4 ET- 13.5050
1/4 MPH- 96.74

Pass#2 - Boost/19psi - O2mv, 830s
60'- 1.7008
330'- 5.1509
1/8 ET- 8.0928
1/8 MPH- 83.45
1/4 ET- 12.8439
1/4 MPH- 101.81

Pass#3 - Boost/22psi - O2mv, 810s
60'- 1.6519
330'- 5.0660
1/8 ET- 7.9821
1/8 MPH- 84.76
1/4 ET- 12.7251
1/4 MPH- 102.27

Still running a little fat so I think this combo has a lot more in it.:biggrin:
This is on a stock turbo that is in need of a rebuild. This is the turbo I ran at BPG last weekend and a few seen how bad it was when I had it off the car Direct Scan showed the car is shifting at 4k on the 1-2 and 4600 on the 2-3 other than that the files looked good.

1987 Grand National
Engine:
109+.030
TRWs
Stock crank, rods,
Stock untouched heads w/stiff springs
204/214 cam
Ported lower intake
Stock TB & Plenum
Stock Intercooler/unmodified

Fuel:
Reds XP Double Pumper/Hotwire
40# injectors
Bosch adj regulator - set at 45psi
Reds 108 Chip 27/25 degrees
110 CAM2 Fuel

Transmission:
Th200R4-no transbrake
Art carr nlu 16930 converter
ATR trans cooler

Exhaust:
Stock turbocharger
Stock Headers
ATR Internal 3" Downpipe w/cutout
Hooker Catback

Suspension: Rear
SSM Lower Lift bars
Air Bags
Trick Springs
Stock shocks

Suspension: Front
Stock Springs
Stock Shocks
Unlinked sway bar

Tires: Front
165R15

Tires: Rear
28x9 M/T ET Drags

 

[11.20n1320]

What turbo is it?
DDay

 

[2 QK 4 U]

What turbo is it?
DDay

22 year old stock turbo

 

[djj624]

Awesome times man. Gives me hope for mid 12's:biggrin:

 

[2 QK 4 U]

Awesome times man. Gives me hope for mid 12's:biggrin:

I'm pretty sure the car has a 12.5x in it. I seen no K.R. on any of those passes. I was amazed the car 60 footed 1.65 off of foot brake.

 

[murphster]

Good runs. Improvement is always nice. You should pick up more when you take out more fuel too.

Have you tried shifting it by hand just to see if it responds any better? Whats the rpm dropping down to after the shifts? I just pulled up an old Directscan file of a mid 12sec run with a stock turbo and everything with an Art Carr 9.5" converter. It shifted at 4700rpm or so and only dropped 600 rpm. The converter was too loose, even though the ET wasn't that bad (12.6@102mph with a 1.68 60ft). Turns out the turbo shaft was loose and eating up the blades too, but not sure how long it had been happening.

My GN that went high 11s on stock stuff recently only has a restalled D5 converter that works great (along with a tight stock turbo). I don't know if you plan on upgrading the turbo or not, and if not, a larger and tighter converter will give you the most efficiency and not much stall is needed.

 

[2 QK 4 U]

Have you tried shifting it by hand just to see if it responds any better? Whats the rpm dropping down to after the shifts? I just pulled up an old Directscan file of a mid 12sec run with a stock turbo and everything with an Art Carr 9.5" converter. It shifted at 4700rpm or so and only dropped 600 rpm. The converter was too loose, even though the ET wasn't that bad (12.6@102mph with a 1.68 60ft). Turns out the turbo shaft was loose and eating up the blades too, but not sure how long it had been happening.

I put it in "D" and go. I have not tried manually shifting it.

It drops 550-600 on the 1-2 and 650 on the 2-3 Plus I'm running a 28" tire so it's not going to rev as high if it had 26" tires.

The converter I have is not matched for the turbo so that's probably why it's not shifting where it's supposed to. I have a 66 but need bigger injectors to go with it. I'll leave the converter in for now. The car would probably pick up if it had a tighter converter like you said. 12.7x for a street car isnt all that bad...just put the radials back on and hook up the sway bar it's a daily driver.:smile:

 

[3.8L V-8 eater]

Surprised by the fact you only gained a tenth from pass 2 to 3. Your 60' was better and 3 more pounds of boost on pass 3 and only a tenth??????

 

[2 QK 4 U]

Surprised by the fact you only gained a tenth from pass 2 to 3. Your 60' was better and 3 more pounds of boost on pass 3 and only a tenth??????

I agree! I think the converter is affecting this and the shift points as well. Next time out I'm going to try manually shifting at 5k

 

[2 QK 4 U]

This pic is of pass #2