Low Power between 1500-3500 RPM

Stallion2w · 08-24-2003, 08:33 AM

I have a 90 LX that has low power response from 1500 to 3500 RPMs at WOT. 3500 on up she runs like a bat out of hell. The engine was freshened up 10,000 miles ago with new bearings, E303 cam,mild porting on the E7TE's, Typhoon intake ( Gasket matched),BBK 70 mm TB & Spacer, 73mm C&L mass air calibrated to the 19lb injectors, 160 degree T-stat, MAC Cold air induction kit, BBK adj. fuel reg set to 37psi, new MSD Blaster Coil, Mac 2.5" off-raod h-pipe, 2 chamber Flowmaster, stock headers, and 3.73 gears loaded into the rear. She has an AOD and runs great getting nearly 19 mpg as a daily driver but the power loss at the low end is driving me nuts...the spark plugs are clean and not showing any unusual burn patterns. I have not done any computer upgrades as of yet as I am unsure of what my best route to take on the chips as I still want to change heads and add a supercharger. Any ideas on how to straighten this out would be appreciated.

lx mike · 08-24-2003, 06:33 PM

stock torque converter? if so then that why you have poor low end responce. all you mods moved your powerband up but the converter can't stall high enough now.

Stallion2w · 08-24-2003, 08:43 PM

I did upgrade the torque convertor......I thought all of my components should have kept my power band in the 1500 to 5500 range though. I do have my timing at 15 degrees currently too. I could be wrong though

speedytang · 08-25-2003, 03:24 AM

To me it sounds like the Cam was not installed straight up with the pistons and crank. For the heck of it turn your timing up by ear or go up another 4 degrees and see if it gets better just don't floor it because you might detonate if the cam is installed correctly.

tmoss · 08-25-2003, 07:29 AM

The E cam and Thyphoon won't make power until then - I don't know if your sig is a typo, but 1,400 rpm stall is not near enough - neither is 2,400 IMHO. 2,800-3,000 is what you really need. Been there & done that.

08-26-2003, 03:09 PM

Quote:

Originally posted by tmoss
The E cam and Thyphoon won't make power until then - I don't know if your sig is a typo, but 1,400 rpm stall is not near enough - neither is 2,400 IMHO. 2,800-3,000 is what you really need. Been there & done that.

I agree. Isn't the stock stall speed like 1500 rpms? If so...I wouldn't think you'd want to go even lower than that when choosing an upgrade?

Stallion2w · 08-30-2003, 04:00 PM

Yes I did mistype my stall for my tranny....it is an 1800 stall. Guess I'll upgrade it as soon as I can scrape up some extra cash. Thanks for all the help guys!!

gtnby2 · 01-15-2009, 08:56 AM

When I had an AOD, I had the EXACT same motor except for a Hartman bread box intake and I used a 2400 stall from GER Performance transmissions and it worked great..Made a big difference in take off but kept the good MPG. No sh*t on the motor though, I had the exact same...gears and all!!! Best time I could post was a 9.18 in the 1/8th but I thought that was respectable for a 3640lb car with me in it!!

USMC302 · 01-21-2009, 07:11 PM

Where are you looking to find posts to comment on from 2003?

gtnby2 · 01-22-2009, 06:19 PM

USMC302,
holy sh*t!! I didn't even notice and to be honest, I work midnights and just got up so I got no idea how I found it!!! I'm glad somebody's awake!!!

08-24-2003, 08:33 AM	#1
Stallion2w Registered Member Join Date: Aug 2003 Location: Fuquay-Varina NC Posts: 3	Low Power between 1500-3500 RPM I have a 90 LX that has low power response from 1500 to 3500 RPMs at WOT. 3500 on up she runs like a bat out of hell. The engine was freshened up 10,000 miles ago with new bearings, E303 cam,mild porting on the E7TE's, Typhoon intake ( Gasket matched),BBK 70 mm TB & Spacer, 73mm C&L mass air calibrated to the 19lb injectors, 160 degree T-stat, MAC Cold air induction kit, BBK adj. fuel reg set to 37psi, new MSD Blaster Coil, Mac 2.5" off-raod h-pipe, 2 chamber Flowmaster, stock headers, and 3.73 gears loaded into the rear. She has an AOD and runs great getting nearly 19 mpg as a daily driver but the power loss at the low end is driving me nuts...the spark plugs are clean and not showing any unusual burn patterns. I have not done any computer upgrades as of yet as I am unsure of what my best route to take on the chips as I still want to change heads and add a supercharger. Any ideas on how to straighten this out would be appreciated.

08-24-2003, 06:33 PM	#2
lx mike Undescribable Join Date: Sep 1998 Location: Ft Myers Fla Posts: 1,539	stock torque converter? if so then that why you have poor low end responce. all you mods moved your powerband up but the converter can't stall high enough now. __________________ Rice Haters Club Member #101

08-24-2003, 08:43 PM	#3
Stallion2w Registered Member Join Date: Aug 2003 Location: Fuquay-Varina NC Posts: 3	I did upgrade the torque convertor......I thought all of my components should have kept my power band in the 1500 to 5500 range though. I do have my timing at 15 degrees currently too. I could be wrong though __________________ 1990 NCSHP 5.0 LX - 302 refreshed, Typhoon Intake (gasket matched), BBK 70mm Throttle Body & Spacer, BBK Adj. Fuel Press. Reg. (set to 37psi), FRPP E303 cam, 160 deg. T-stat, MSD Blaster Coil, FRPP 9mm wires, 73mm C&L Mass Air (cal.19lb inj.) Mac Cold Air Induction, Mac 2.5" off-road h-pipe, 2.5" Flowmaster 2-chamber cat-back system, FRPP 3.73 gears, AOD with Stage 2 shift kit and 1400 stall converter.

08-25-2003, 07:29 AM	#5
tmoss Registered Member Join Date: Mar 2003 Location: Saint Louis, MO Posts: 634	The E cam and Thyphoon won't make power until then - I don't know if your sig is a typo, but 1,400 rpm stall is not near enough - neither is 2,400 IMHO. 2,800-3,000 is what you really need. Been there & done that. __________________ Tom (Torque) Moss 88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE). http://www.fastlanecars.com/

08-30-2003, 04:00 PM	#7
Stallion2w Registered Member Join Date: Aug 2003 Location: Fuquay-Varina NC Posts: 3	Yes I did mistype my stall for my tranny....it is an 1800 stall. Guess I'll upgrade it as soon as I can scrape up some extra cash. Thanks for all the help guys!! __________________ 1990 NCSHP 5.0 LX - 302 refreshed, Typhoon Intake (gasket matched), BBK 70mm Throttle Body & Spacer, BBK Adj. Fuel Press. Reg. (set to 37psi), FRPP E303 cam, 160 deg. T-stat, MSD Blaster Coil, FRPP 9mm wires, 73mm C&L Mass Air (cal.19lb inj.) Mac Cold Air Induction, Mac 2.5" off-road h-pipe, 2.5" Flowmaster 2-chamber cat-back system, FRPP 3.73 gears, AOD with Stage 2 shift kit and 1400 stall converter.

08-25-2003, 03:24 AM	#4
speedytang Registered Member Join Date: Oct 1999 Location: Marengo, Ohio.USA Posts: 135	To me it sounds like the Cam was not installed straight up with the pistons and crank. For the heck of it turn your timing up by ear or go up another 4 degrees and see if it gets better just don't floor it because you might detonate if the cam is installed correctly.

01-15-2009, 08:56 AM	#8
gtnby2 Registered Member Join Date: Aug 2001 Location: Woodlawn IL,USA Posts: 62	Re: Low Power between 1500-3500 RPM When I had an AOD, I had the EXACT same motor except for a Hartman bread box intake and I used a 2400 stall from GER Performance transmissions and it worked great..Made a big difference in take off but kept the good MPG. No sh*t on the motor though, I had the exact same...gears and all!!! Best time I could post was a 9.18 in the 1/8th but I thought that was respectable for a 3640lb car with me in it!!

01-21-2009, 07:11 PM	#9
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	Re: Low Power between 1500-3500 RPM Where are you looking to find posts to comment on from 2003? __________________

01-22-2009, 06:19 PM	#10
gtnby2 Registered Member Join Date: Aug 2001 Location: Woodlawn IL,USA Posts: 62	Re: Low Power between 1500-3500 RPM USMC302, holy sht!! I didn't even notice and to be honest, I work midnights and just got up so I got no idea how I found it!!! I'm glad somebody's awake!!! __________________ GTNBY2 getin' by 2!! 351W, 30 over, Comp Cams XE274h, Trick Flow Street Heat intake, AFR185 heads, 70mm TB, 80mm Mass, 24lb inj, Moroso cold air kit, BBK 1 5/8" unequal length headers, 2 1/2" off road X-pipe, 40 series Flowmasters Last edited by gtnby2; 01-22-2009 at 06:20 PM.. Reason: additional info*

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Formula for figuring RPM	o2superstang	Modular Madness	0	06-27-2002 04:19 PM
Vibration between 1100 and 1500 rpm??	jason347lx	Windsor Power	6	06-03-2002 12:49 PM
Performer RPM vs RPM Air Gap	Phantom5oh	Windsor Power	17	01-10-2002 04:19 PM
power shift?	JamGtStang	Windsor Power	6	03-01-2001 02:11 PM
Electrical power, where to splice?	Chris_H	Windsor Power	3	02-11-2001 08:29 PM