Powerband question

[rigamaroles]

May sound like a noob question, but from what I've read and from experiences in other mustangs, my power comes at a totally different range. What I read is that most other people get grunt from a low rpm range. Mine is not so true to that. My car is to my knowledge bone stock (I can post a sound clip of idle of necessary) besides a custom h pipe delta flow 40's and a k&n(According to a gear calc I have 3:27 gears). However it will stay side by side and ocassionally pull on modded ones.

My powerband doesnt kick in until about 3k rpm and dies off around 5700-5800 on the stock tach. In the many mustangs I've ridden in they pull hard from like 1500-5000. Why is my power range so much different? I've wondered if my fuel pump isnt weak or carbon build up, or a vacuum leak or something? Any help would be appreciated, thanks!

 

[89blkntch]

Mine does the same thing. It has go in the lower range, but from around 2500-6500 it pulls real hard. I was wondering the same thing. I lined up next to my friend and he has trimmick tranny, centerforce clutch, and 15 fatties in the rear. I ran with him and kept up. If you find out let me know

 

[Daggar]

Please provide a COMPLETE list of modifications.

 

[blackened88lx]

Mine does the same thing. It has go in the lower range, but from around 2500-6500 it pulls real hard. I was wondering the same thing. I lined up next to my friend and he has trimmick tranny, centerforce clutch, and 15 fatties in the rear. I ran with him and kept up. If you find out let me know

Stock rev limiter is at 6250, so there's no way you're pulling to 6500, unless your stock tach is really screwed up.

 

[rigamaroles]

As far as I know, my car has custom h pipe, delta flow 40's, k&n conical, msd wires, iridium plugs, accel cap (if you call them mods), lowering springs. My car has no real performance mods, its stock.

I've hung with a 90lx with e303, 1.7rr's, short throw, x pipe, lt headers, flows, cai, u/d. A 90 notch with short throw, u/d, smog delete, e-fan, fpr, cai.

 

[Daggar]

You should not have lost any low end with what you have there. The iridium plugs aren't doing you any good but they should also not be the cause of any performance loss.

Pull codes and see if anything pops up.

 

[Original Owner]

I've heard that 5.0 engines set up for driving schools have some porting done to the upper and lower intake manifold and sometimes the heads. Extrude-Hone and other types of porting can be accomplished on stock hardware without any tell-tale signs on the outside. The porting lets the engine breathe at higher RPM, with a penalty at lower RPM. This is good for driving schools, bad for stop-light to stop-light drag racing. My intake is stock and runs as you described; strong 1500-5000 and then falls on it's face. Maybe someone did some porting on your intake prior to your ownership? If you don't have any codes, drive on. I wish my car could breathe for another 600-700 RPM on top.

 

[rigamaroles]

It could have been ported, it was rebuilt 25k before I bought the car so I dont know whats actually in there.

Daggs, there are no codes present on the car so I dunno . Its not that this is a bad thing, as I can keep up quite well. It pulls from idle but not that hard, and as soon as 3k hits it pulls really hard. I dont know ?

 

[projectfiveo]

I had a buddy in a stock 87 lx that did the same thing...he was never beat around here and had nothing done to it...ive drove the car and it wouldnt fall out of a tree until high rpms then it comes alive!

 

[rigamaroles]

Well that'd be my car then, I'll just put some 3:73s in there and call it a day.

 

[Daggar]

Hell yeah... that'd give you some "umph!".

 

[rigamaroles]

Well, it'll be a while. I have a guy whom I bought my car from that has a huge mustang graveyard. Well over 300 mustangs and about 25 restored fox bodies (3 svo, 2 limited edition yellow/chrome verts, 90 notch with 01 cobra suspension/drivetrain/brakes, 78 cobra, the list goes on and on and on). We became buddies and I asked him about brakes. Hes going to sell me the complete rear end with calipers, hoses, rotors, front spindles discs, literally everything off of a 95 cobra for 1200. So in the spring when I buy that I'll rebuild the rear and put in some 3:73.

I'm going to get an e-fan regardless, my question is does that help with lower end torque because of the parasitic loss, or is it in the higher rpms? Or slight through the rpm range.