What can cause a SSEi to be slow?
 

I have replaced the following:

Spark Plugs
Plug Wires
MAF Sensor
O2 Sensor
Replaced fuel filter
K&N Intake
Cleaned the TB
Cleaned EGR Valve
Replaced PCV
Replaced cat with highflow magnaflow
Freshly Rebuilt Supercharger


However as you can see from the video my car is still slow, we are talking at least 9 seconds to get to 60.

http://cal48.com/mycarisslow.wmv
(right click save as, 6 megs)

LOOK how slow it is from 50-60, pretty sad.

Therefore I am trying to compile a list of what can be holding the car back without having a scantool.

The car runs perfect at idle, however the performance is still not quite normal.


- Exhuast Manifolds are cracked
- Failing Fuel Pump or FPR
- Vaccum Leaks

Hans, when I was having the same kinda problem (good idle, but piss poor performance), it turned out to be the TPS. Not something you can test without a scantool, but its something to consider.

It has been tested with my DMM, it shows correct voltage at idle and simulated WOT, there appear to be no "dead" spots either that I can tell. I will replace that soon enough though.

Okie dokie. I just wanted to toss it out there.

Getting any belt slippage on the super?????

Dead link. Page cannot be displayed.

Back when I had a Capri, I had bracket on the throttle cable break in such a way that floored wasn't WOT at the TB. The bracket looked fine at Idle. That was tuff for one person to figure out, but I got it.

Link Fixed.....


daman - I just replaced both belts with gatorbacks so I dont think that is the cause but could be..I am getting good boost though, probably around 8 or 9lbs. This is with the stock 2.5" pulley.

I am wondering perhaps if I have a bad fuel injector or 2.

My resistances on the coil packs are pretty close as well.

Also gotta figure in mileage and age. She might just be tired.

Wow, I guess that is pretty sluggish. Mine is alot quicker than that, but that's probably because it's a 94.

Same drivetrain as yours.

No, it's not. The 94 has a Gen3 supercharger and a larger throttle body. The Gen 2 was used in 92 and 93 with a smaller throttle body. There's a significant difference.

I thought the 92/93 only had 205 for the L67. 94/95 has 225, right?

My bad. That just answered a big problem i'm having with a freinds car that i'm working on. Parts store told me they were the same.

Yes and no. All of them were overrated.

92 was listed at 205. But there were some interesting changes in 93, and our experiences dictate the 93's are quicker. But the rating didn't change.

Then the 94/95 were rated at 225.

Don't forget that power comes on ALOT quicker (lower rpm) than the S2. Our boost comes on quite a bit quicker too.

Hmm... cool. Our boost comes quicker than the S2. Awesome! I like the whine of the M62 better than the M90.

back on topic.... :roll:

is the supercharger attached?

CORRECTION:

UNDERrated. Not OVERrated. My bad.

You may like the whine better, but it's only because the S1 has to spin faster to produce the same boost that the M90 gets at a lower RPM. Heat and wear are worse for us. Our boost responds quicker, but at a cost.

Which is why our torque peaks at a lower rpm (desirable) and our cars fall flat on their faces while the S2 keeps pulling.

Yep, you should check the vacuum hoses, send out the injectors to get cleaned, and a few other fuel related items. There may be a problem there.

Hans, pull your injectors and soak them in injector cleaner overnight. Replace the O-rings when you reinstall them. It's good maintenance.

Or get them down here to be cleaned and matched if it's in the budget. It can rule them out, and you have another car to drive for the week they'll be gone.

What are your TPS voltages at idle and WOT?

wow, that is really bad...i think my LN3 accelerates faster, maybe not, but it feels like it..yeah i would say clean the injectors, change the furl filter, it might be starving, and other than that...i dunno. Hope it all works out.

Not to be a PITA here..

We seem to be trying to diagnose issues on this car for performance or speed a lot lately, we know you have cracked exhaust manifollds that are most likely giving you a ton of KR.

I would like to suggest the known issues be fixed and then diagnose from there. Meanwhile we'll be spinning our wheels.

TPS tests properly, replacing doesn't make $$ sense, why replace known good parts?
Coils test good
Plugs are new
Wires are new
Maf should be clean
TB should be clean

Honestly...the largest issue here that I can see causing a peformance problem is KR from cracked exhaust manifolds.

I agree. We need to rule out as many FREE or very cheap fixes/items, and take care of all known items first.

Each one is going to give you a little more. Injectors won't buy you jack if you have cracked EM's. Tackle that first, and while they're off the car, take care of other issues. Or send your injectors out at the same time to make use of the time the car is down anyway.

Would a restrictive cat do this to him? Would this show up on his boost gage as overboost? The one vac line that I came across that really looked bad was the one that connected to the trans modulator. Another one to check would be the line to the FPR.

Also, what about a compression check?