Tuning with pure meth injection (Track Results)
03-05-2016, 11:56 PM
#22
Excellent point. I'll do that.
Converter seemed tight. I started the runs at 2500 and it would flash to a bit past 3000.
I could feel it struggle for rpm past 5200.....
I'll find out what turbos these actually are. The exh past the turbos is straight through. But Billy mentioned that it boosts faster w/o the muffs.
Converter seemed tight. I started the runs at 2500 and it would flash to a bit past 3000.
I could feel it struggle for rpm past 5200.....
I'll find out what turbos these actually are. The exh past the turbos is straight through. But Billy mentioned that it boosts faster w/o the muffs.
03-06-2016, 01:20 PM
#23
Using mph data from the dyno (138) and 6500 rpm, 32" tires and 4.30 gears the Wallace calculator shows approx 6% slip.
Not the most scientific data, but it's not showing anything outrageous.
These are the turbos:
http://www.cxracing.com/mm5/merchant.mvc?Screen=PROD&Product_Code=TRB-T72-P81-R_FLNG-OIL-FEED-AN4&Category_Code=TOCH
Not the most scientific data, but it's not showing anything outrageous.
These are the turbos:
http://www.cxracing.com/mm5/merchant.mvc?Screen=PROD&Product_Code=TRB-T72-P81-R_FLNG-OIL-FEED-AN4&Category_Code=TOCH
03-06-2016, 05:46 PM
#25
Using mph data from the dyno (138) and 6500 rpm, 32" tires and 4.30 gears the Wallace calculator shows approx 6% slip.
Not the most scientific data, but it's not showing anything outrageous.
These are the turbos:
http://www.cxracing.com/mm5/merchant...gory_Code=TOCH
Not the most scientific data, but it's not showing anything outrageous.
These are the turbos:
http://www.cxracing.com/mm5/merchant...gory_Code=TOCH
03-07-2016, 06:07 AM
#30
160 isn't bad, but I'd expect to see 180 or so. It'll run with the cam a tooth out and a cam sensor is typically used to tell the ecu that the cam is turning, not actual cam position, if that makes sense. The cam could still be off if it wasn't degreed. Lotta guys just buy em and stuff em in. No point in a custom/specialty grind if you're not going to put it where it belongs IMO.
03-07-2016, 06:54 AM
#31
160 is on the low side IMO. But I can't see it causing the engine to fall on it's face at 5200. May tap the hotside and check back pressure? any chance a flex section could have come apart?
May check power supply to the coils as well, make sure it isn't drowning out spark. Gap the plugs excessively tight and see it helps at all?
May check power supply to the coils as well, make sure it isn't drowning out spark. Gap the plugs excessively tight and see it helps at all?
Last edited by Forcefed86; 03-07-2016 at 07:30 AM.
03-07-2016, 09:32 AM
#32
160 does seem a bit low. But I'd guess it means the cam isn't off a tooth. It was installed fit to dot.
I don't think there is any flex. It's a twin setup. I didn't look under the truck.
Coils are remote mounted. I suggested ohming the wires.
Another thing we should check is lifter preload.
I don't think there is any flex. It's a twin setup. I didn't look under the truck.
Coils are remote mounted. I suggested ohming the wires.
Another thing we should check is lifter preload.
03-07-2016, 10:41 AM
#33
160 does seem a bit low. But I'd guess it means the cam isn't off a tooth. It was installed fit to dot.
I don't think there is any flex. It's a twin setup. I didn't look under the truck.
Coils are remote mounted. I suggested ohming the wires.
Another thing we should check is lifter preload.
I don't think there is any flex. It's a twin setup. I didn't look under the truck.
Coils are remote mounted. I suggested ohming the wires.
Another thing we should check is lifter preload.
03-07-2016, 02:14 PM
#34
Don't get all worried Ron, I am almost willing to bet, it is just because the car is a big stalled turbo car. My car did the same thing on the dyno. Check out the graph. Graphs like these are very typical of stalled turbo cars with a good amount of power.
And also, to add, I would be running gas+meth at 11.5. I think exactly where you are with it.
And also, to add, I would be running gas+meth at 11.5. I think exactly where you are with it.
03-07-2016, 10:26 PM
#36
Don't get all worried Ron, I am almost willing to bet, it is just because the car is a big stalled turbo car. My car did the same thing on the dyno. Check out the graph. Graphs like these are very typical of stalled turbo cars with a good amount of power.
And also, to add, I would be running gas+meth at 11.5. I think exactly where you are with it.
And also, to add, I would be running gas+meth at 11.5. I think exactly where you are with it.
03-08-2016, 12:10 AM
#38
Don't get all worried Ron, I am almost willing to bet, it is just because the car is a big stalled turbo car. My car did the same thing on the dyno. Check out the graph. Graphs like these are very typical of stalled turbo cars with a good amount of power.
And also, to add, I would be running gas+meth at 11.5. I think exactly where you are with it.
And also, to add, I would be running gas+meth at 11.5. I think exactly where you are with it.
And yes, we were right at 11.5:1
That just made sense to me for a target
03-09-2016, 10:13 AM
#40
Did you verify valve spring pressures? Honestly looks alot like valve float.
Had simular issues with a 521 I built and the springs were still in spec, but the motor wouldn't rev higher than 4500 like it was hitting a limiter. Decent cam ramp rates, heavy valves and RPM = more spring pressure to keep the valves closed. Lunati and edelbrock couldn't tell me why it was falling on its *** as everything was in the recommended range.
I pulled the springs and ran .060" shims and then she would run to 6K. This was after replacing the ignition system and fuel system thinking it was spark and fuel.
Now throw in 22lbs of boost pushing down on the valves as they are trying to close shut and it makes the problem worse.
Since the wires help it might be the spark blowing out... what are the gaps? Stock coils? Charging voltage aroung 14v when its breaking up?
Had simular issues with a 521 I built and the springs were still in spec, but the motor wouldn't rev higher than 4500 like it was hitting a limiter. Decent cam ramp rates, heavy valves and RPM = more spring pressure to keep the valves closed. Lunati and edelbrock couldn't tell me why it was falling on its *** as everything was in the recommended range.
I pulled the springs and ran .060" shims and then she would run to 6K. This was after replacing the ignition system and fuel system thinking it was spark and fuel.
Now throw in 22lbs of boost pushing down on the valves as they are trying to close shut and it makes the problem worse.
Since the wires help it might be the spark blowing out... what are the gaps? Stock coils? Charging voltage aroung 14v when its breaking up?