Attention: TDR Forum Junkies 
HEMI®Dart
TDR MEMBER
Installed my HX-40 and ATS Pulse Exhaust Manifold today. A guesstimate my truck has about 310/730 Flywheel HP & Torque. I am running the light AFC spring. Note signature for specifics.
Things I noticed on my 20 mile testdrive:
1. ) I maybe have 10% more turbo lag than an HX-35 12cm2. Maybe less. The throttle is not as responsive at low boost levels. You'll need to push the throttle slightly further to get the same result as a 35 at low rpm/boost levels. What LITTLE you lose in low rpm power, you get it back 10 fold in the mid & upper RPM range. There is not a flat spot. No big deal. A couple of clicks tighter on the governer spring retainers and I should have most of it back.
2. ) EGT's are the same crusing on the highway at 65 MPH. Boost won't register on my 0-50 psi gauge. Maybe 1 or 2 psi @ 65 mph.
3. ) Exhaust is louder, at idle that "airy" sound is gone. A deep pitched tone bellows from the exhaust tip. The turbo has a different noise than the 35. The whine is not as high pitched. You can tell by the sound the turbo is larger. Still sounds neat though. Engine seems to idle a little smoother too.
4. ) No more or less smoke than the 35 at low boost levels when you put your foot into it.
5. ) Boost comes VERY QUICKLY. It comes in ALOT faster than with a HX-35 12cm2. I went from 5 psi to 45 psi boost in about a second at 3/4 throttle. The little Bosch 215's seem to spool up the turbo fine. Will adjust wastegate to dump boost @ 40 psi.
6. )IMO, Truck sounds different and takes on a new personality at mid and upper rpm range with less backpressure. Gone is that hissing like noise that you get with an HX-35 at high boost levels. Like the exhaust is corked up. There is gobs of torque in the mid & upper rpm range. Unbeliveable!. Even with mild Bosch 215 injectors.
7. ) I couldn't get my EGT to go over 900º.
Overall very happy with the new 40 & ATS exhaust manifold.
#ad
------------------
Bill R
94 2500 SLT 4x4 5 Speed, 3. 54 LS, JRE 4" exhaust, Autometer Pyro, Boost & Water temp gauges, Bosch 215 HP injectors, Timing @ 14. 7º, JRE Stage III #4 plate 270/675, AFC spring kit, High performance delivery valves, Piers prepped HX-40, Governer spring kit, ATS Pulse exhaust manifold, Scotty Air, Bully Dog Propane Injection, Roadmaster Active Suspension, Optima Red Tops, Geno's Exhaust Blanket, Espar Heater (won it!), Synthetic lubes throughout.
[This message has been edited by HEMI®Dart (edited 05-03-2001). ]
Things I noticed on my 20 mile testdrive:
1. ) I maybe have 10% more turbo lag than an HX-35 12cm2. Maybe less. The throttle is not as responsive at low boost levels. You'll need to push the throttle slightly further to get the same result as a 35 at low rpm/boost levels. What LITTLE you lose in low rpm power, you get it back 10 fold in the mid & upper RPM range. There is not a flat spot. No big deal. A couple of clicks tighter on the governer spring retainers and I should have most of it back.
2. ) EGT's are the same crusing on the highway at 65 MPH. Boost won't register on my 0-50 psi gauge. Maybe 1 or 2 psi @ 65 mph.
3. ) Exhaust is louder, at idle that "airy" sound is gone. A deep pitched tone bellows from the exhaust tip. The turbo has a different noise than the 35. The whine is not as high pitched. You can tell by the sound the turbo is larger. Still sounds neat though. Engine seems to idle a little smoother too.
4. ) No more or less smoke than the 35 at low boost levels when you put your foot into it.
5. ) Boost comes VERY QUICKLY. It comes in ALOT faster than with a HX-35 12cm2. I went from 5 psi to 45 psi boost in about a second at 3/4 throttle. The little Bosch 215's seem to spool up the turbo fine. Will adjust wastegate to dump boost @ 40 psi.
6. )IMO, Truck sounds different and takes on a new personality at mid and upper rpm range with less backpressure. Gone is that hissing like noise that you get with an HX-35 at high boost levels. Like the exhaust is corked up. There is gobs of torque in the mid & upper rpm range. Unbeliveable!. Even with mild Bosch 215 injectors.
7. ) I couldn't get my EGT to go over 900º.
Overall very happy with the new 40 & ATS exhaust manifold.
#ad------------------
Bill R
94 2500 SLT 4x4 5 Speed, 3. 54 LS, JRE 4" exhaust, Autometer Pyro, Boost & Water temp gauges, Bosch 215 HP injectors, Timing @ 14. 7º, JRE Stage III #4 plate 270/675, AFC spring kit, High performance delivery valves, Piers prepped HX-40, Governer spring kit, ATS Pulse exhaust manifold, Scotty Air, Bully Dog Propane Injection, Roadmaster Active Suspension, Optima Red Tops, Geno's Exhaust Blanket, Espar Heater (won it!), Synthetic lubes throughout.
[This message has been edited by HEMI®Dart (edited 05-03-2001). ]
