Quick Fix ? Is There One?

FdMust88 · 08-03-2001, 05:52 PM

Let me run down my mods first and maybe someone can answer my question.. I have a 91 LX with, MAC after-cat exhaust, BBK H-pipe (off-road), stock headers, MAC cold air induction fender mount kit, Edelbrock 70mm T.B. and EGR plate, Pro-M 75mm MAF Sensor, Kirban Adj. Fuel Press. Reg., everything else is pretty much stock except wires, plugs and things like that.. Here is my question, this week I installed the 70mm T.B. (I opened up the intake), fuel press. Reg. (set @ 42psi), 75mm MAF, and the H-pipe, and disconnected the battery for over 20 minutes. Why have I, what seems to be, lost some torque?? Is the exhaust to free flowing and the T.B. too big? I chose these components because I plan on adding a supercharger in the future.. Is there a quick fix too gain back some of my torque without removing any of my new parts... Any suggestions or comments would be great, thanks...

Chris_H · 08-03-2001, 06:00 PM

To be honest I think your TB is too big for everything being pretty much stock. I added my 65mm about 3 months ago, and there really was no need for a bigger TB with my combo. But I did it for the same reason you did, future mods. I'd say go back to your stock Tb and see if that fixes your problem.

Chris

------------------
1987 LX, rebuilt 306, Mac shorty headers 1 5/8, 2 1/2" Mac off road h-pipe, 2 1/2" 2 Chamber Flowmasters cat-back, Mac underdrive pullies, 65mm Throttle Body/Spacer, 3.55, K&N, Tremec 3550, King Cobra Clutch, Steeda Tri-Ax, Steeda Adj. Clutch Quadrant, Autometer gauges, White face gauges, blue silicone radiator hoses.
Best times:
2.331 60ft, 9.966 @ 71.069 1/8 mile, 15.491 @ 91.846 1/4 mile at 4000 ft. elevation on street tires
207.0 RWHP 279.7 RWTQ

Mr 5 0 · 08-03-2001, 07:02 PM

Good advice from Chris_H.

Sometimes, 'future mods' need to be done all at once and this is probably one of those times, at least as far as the TB goes.

As Chris said; try re-installing the stock TB, that should fix your low-end torque problem.

dinomite · 08-03-2001, 07:55 PM

the tb, in conjunction with the open exhaust is the problem. putting your stock tb back on should help.

------------------
90LX AOD Convertable: Lakewood control arms, FMS springs.
Best 1/4: 15.277@92.25 (2.27 60')
AIM: dinomite1, roadracestang
dinomite@softhome.net

FdMust88 · 08-04-2001, 09:29 AM

Thanks Guys, I'll give it a try once I get some new gaskets. The old ones ripped apart when I removed the stock T.B.

SHaFT7 · 08-04-2001, 01:13 PM

the 70mm TB has a slower velocity than the 65mm TB does i believe, which means you're getting less air into the chambers

use a 70mm if you're using a blower or turbos

*i know i have a 70mm on mine, but the kid that had it b4 me put it on, and i don't have the money to do a 65mm*

------------------
SHaFTed

91GT, 2 chamber flows, dumps, 70MM BBK TB, K&N conical, Robert Shaw tstat, Hurst short throw, T5, 17" Lexani Roma wheels, 235/40/R17 on front, 255/45/R17 on back, mach1 hood, LX tail lights, bright red!

08-04-2001, 02:22 PM

I agree, that 70 is too big. You exhaust isn't hurting you a bit though, now if you added 1 5/8 headers to a stock engine.... that would hurt your tq as well.

------------------
Rick
My 89lx(updated 7/20/2001)
Sold

08-03-2001, 05:52 PM	#1
FdMust88 Registered Member Join Date: Apr 1999 Location: Massachusetts Posts: 84	Quick Fix ? Is There One? Let me run down my mods first and maybe someone can answer my question.. I have a 91 LX with, MAC after-cat exhaust, BBK H-pipe (off-road), stock headers, MAC cold air induction fender mount kit, Edelbrock 70mm T.B. and EGR plate, Pro-M 75mm MAF Sensor, Kirban Adj. Fuel Press. Reg., everything else is pretty much stock except wires, plugs and things like that.. Here is my question, this week I installed the 70mm T.B. (I opened up the intake), fuel press. Reg. (set @ 42psi), 75mm MAF, and the H-pipe, and disconnected the battery for over 20 minutes. Why have I, what seems to be, lost some torque?? Is the exhaust to free flowing and the T.B. too big? I chose these components because I plan on adding a supercharger in the future.. Is there a quick fix too gain back some of my torque without removing any of my new parts... Any suggestions or comments would be great, thanks...

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Need Advise ASAP Gonna order Hoosier Quick Time Pro's Tommorow	Mustang_GT_90	Windsor Power	1	08-12-2002 06:58 AM
Quick Question about Roll Cage/Race seat compatibility	Fox Body	Windsor Power	4	03-15-2002 01:16 PM
Quick change ??? PKRWUD I need you	mustangdani55	Blue Oval Lounge	9	02-20-2002 04:27 PM
Quick little ricer!	bstang46	Stang Stories	0	11-09-2001 03:40 PM
Hoosier Quick Time	pro-stang	Windsor Power	0	01-24-2001 11:00 AM

08-03-2001, 06:00 PM	#2
Chris_H Registered Member Join Date: Oct 1999 Location: New Mexico Posts: 488	To be honest I think your TB is too big for everything being pretty much stock. I added my 65mm about 3 months ago, and there really was no need for a bigger TB with my combo. But I did it for the same reason you did, future mods. I'd say go back to your stock Tb and see if that fixes your problem. Chris ------------------ 1987 LX, rebuilt 306, Mac shorty headers 1 5/8, 2 1/2" Mac off road h-pipe, 2 1/2" 2 Chamber Flowmasters cat-back, Mac underdrive pullies, 65mm Throttle Body/Spacer, 3.55, K&N, Tremec 3550, King Cobra Clutch, Steeda Tri-Ax, Steeda Adj. Clutch Quadrant, Autometer gauges, White face gauges, blue silicone radiator hoses. Best times: 2.331 60ft, 9.966 @ 71.069 1/8 mile, 15.491 @ 91.846 1/4 mile at 4000 ft. elevation on street tires 207.0 RWHP 279.7 RWTQ

08-03-2001, 07:02 PM	#3
Mr 5 0 Conservative Individualist Join Date: May 1997 Location: Wherever I need to be Posts: 7,487	Good advice from Chris_H. Sometimes, 'future mods' need to be done all at once and this is probably one of those times, at least as far as the TB goes. As Chris said; try re-installing the stock TB, that should fix your low-end torque problem.

08-03-2001, 07:55 PM	#4
dinomite The Dude Join Date: Feb 2001 Location: Arlington, VA Posts: 1,262	the tb, in conjunction with the open exhaust is the problem. putting your stock tb back on should help. ------------------ 90LX AOD Convertable: Lakewood control arms, FMS springs. Best 1/4: 15.277@92.25 (2.27 60') AIM: dinomite1, roadracestang dinomite@softhome.net

08-04-2001, 09:29 AM	#5
FdMust88 Registered Member Join Date: Apr 1999 Location: Massachusetts Posts: 84	Thanks Guys, I'll give it a try once I get some new gaskets. The old ones ripped apart when I removed the stock T.B.

08-04-2001, 01:13 PM	#6
SHaFT7 Registered Member Join Date: Jul 2000 Location: Lawrence, KS, USA Posts: 169	the 70mm TB has a slower velocity than the 65mm TB does i believe, which means you're getting less air into the chambers use a 70mm if you're using a blower or turbos i know i have a 70mm on mine, but the kid that had it b4 me put it on, and i don't have the money to do a 65mm ------------------ SHaFTed 91GT, 2 chamber flows, dumps, 70MM BBK TB, K&N conical, Robert Shaw tstat, Hurst short throw, T5, 17" Lexani Roma wheels, 235/40/R17 on front, 255/45/R17 on back, mach1 hood, LX tail lights, bright red!

08-04-2001, 02:22 PM	#7
rbatson Guest Posts: n/a	I agree, that 70 is too big. You exhaust isn't hurting you a bit though, now if you added 1 5/8 headers to a stock engine.... that would hurt your tq as well. ------------------ Rick My 89lx(updated 7/20/2001) Sold