Power loss

The torque peak for the 7A-FE if I remember correctly is ~2,400 rpm. Should be close to that on the 4-AF. Maybe that's why.

4A-F gets peak power at 6000rpm.

Ukrainian102 said:

The torque peak for the 7A-FE if I remember correctly is ~2,400 rpm. Should be close to that on the 4-AF. Maybe that's why.

Click to expand...

No.

Torque at 4800 for 4A-FE.

Ukrainian102 said:

The torque peak for the 7A-FE if I remember correctly is ~2,400 rpm. Should be close to that on the 4-AF. Maybe that's why.

Click to expand...

That sounds way off

Sorry, 7A-FE is 2,800 rpm torque peak, much lower than the 4,400 rpm of the 4A-FE. Useful for smoking everyone off-the-line and hauling groceries uphill.

Check it out here: http://www.corollaperformance.com/TechInfo/Index.html#specs

Cool I have a link that says stuff too, who knows what it is

This has an AE102 4a-fe with a TQ Peak at 3,000 RPMs:
http://autos.msn.com/research/vip/spec_engines.aspx?modelid=2785&trimid=-1&src=VIP&tab=2&sub=1

This one has the 7a-fe at 134 ft-lbs of Tq
http://autos.msn.com/research/vip/Spec_Glance.aspx?modelid=2758&trimid=-1&src=VIP&tab=2&sub=0

But this one supports the 2,800 RPM claim for the 7a-fe:
http://www.geocities.com/MotorCity/Pit/9975/dataBySubject/GasolineEngines.html#A-series

To get back on topic the above link also shows that the 4a-f has peak HP at 6,000 RPMS (90HP @ 6,000, 95lb-ft @3,600) so it should be screaming at 5,000 RPMs not slowing down.

Don't trust MSN Autos. They don't have the right ground clearance listed for my friend's MPV. (Long story, we were having a bet on something.):lol:


Also MSN autos says torque for a 93-94 DX is 134, but it suddenly drops to 110 in 1995! :ugh3:

Chris Corolla S said:

Cool I have a link that says stuff too, who knows what it is

This has an AE102 4a-fe with a TQ Peak at 3,000 RPMs:
http://autos.msn.com/research/vip/spec_engines.aspx?modelid=2785&trimid=-1&src=VIP&tab=2&sub=1

This one has the 7a-fe at 134 ft-lbs of Tq
http://autos.msn.com/research/vip/Spec_Glance.aspx?modelid=2758&trimid=-1&src=VIP&tab=2&sub=0

But this one supports the 2,800 RPM claim for the 7a-fe:
http://www.geocities.com/MotorCity/Pit/9975/dataBySubject/GasolineEngines.html#A-series

To get back on topic the above link also shows that the 4a-f has peak HP at 6,000 RPMS (90HP @ 6,000, 95lb-ft @3,600) so it should be screaming at 5,000 RPMs not slowing down.

Click to expand...

The reason for the power/torque decrease on the 7AFE is emissions related... and they did decrease a bit... although 134 ftlbs is an exaggerated number (110-115 ft lbs is about right)... and the max torque does peak in the 2500-2800 rpms range, depending on who you're asking.

As for the 4AFE, it's an undersquared motor, which a short stroke so torque peak will be higher in the rpm band... even with the FE head. It delivers a fairly flat torque curve till it peaks, then drops off rapidly. Anyways... hardly "screaming"... but it'll get you from point A to point B... ;]

4A-F and 4A-FE have different cams, 4A-FE peaks at slightly below 6000, (somewhere near 5600) and the 4A-F at 6000

its the same with the 4a-ge.

since its my daily driver and i want to conserve gas i shift @ 4k most of the time.

its extremely weak before the 3500 rpm mark... then right after that i feel a very strong pull - that's my que to shift '

also, try putting some Chemtool in your gas tank... it helped me a lot.