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power loss on my EVO 3 motor

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97GSXAUTOX

15+ Year Contributor
30
0
Jul 31, 2004
mound, Minnesota
'95 talon tsi. swapped evo 3 motor with AEM for management. Turbo: SC34 mitsu, hks 272 cams, hks evc, shepherd stage 4 trani.

My problem is that as soon as the turbo reaches full boost at around 5500 rpm, the engine virtually wont climb any higher. rpms are forced to stay the same, boost stays exactly the same, speed stays exactly the same. It will go clear through first all the way to redline, but second, third, etc. do the above. I plugged in my laptop and ran 3 maps, all of which show the tuning to be flawless. The engine temps are normal, there is a slight tick in the engine bay at around 3k if you rev up then allow rpms to drop quickly you catch the clicking noise. I've written it off as lifters until this situation.

Before tuning the engine ran all the way to redline in all gears. If there is any other info I can provide to diagnose, please let me know. otherwise, whats going on?
 
Is it possible that in my AEM somewhere is an automatic rev limiter? Any help on this would be great. Ive searched the program and cant find anything. The owners manual is useless.
 
Who tuned it?

A rev limiter will not be subtle, it would bounch off the set RPM level.

I would have to say the tune it way off... to the point the ECU trying to save the engine. If it's pulling vast amounts of timing then it could feel like hitting a wall.

I haven't used the AEM unit so I'm not positive, but to me it sounds like your original tune was better. Did you make any big changes?
 
It is not a slipping clutch. That means his RPMS would just climb and the speed won't, thats a slipping clutch. I have a feeling its related to your AEM EMS. I am not too familar with the EMS, you should if all your sensors are doing what they are suppose to. Start your tune from scratch and tune until this problem occures again.
 
I didnt get down to the shop after talking to them yesterday. Apparently the car will run all the way to redline in 1st, and hits that wall at 5500 in the other 4. The guy tuning says thats not possible for the car to do that with an AEM rev limiter set. He also said something about launch control, but that its not the problem either. I left it with them for a few days and they are going to get it up on a lift to look over it.

Let me know if that info helps target the problem, and let me know what I should be telling them to look for, since they arent a DSM specific shop. They sounded very confused yesterday, which isnt very comforting. Thanks for all the help so far guys.

p.s. its not the clutch slipping. I have an exceedy 6 puck in a shepherd racing stage 4 tranni that only has 3500 miles on it. I probably should have included that info. :D
 
In reply to ultimatedsm:

The most confusing part of this problem for the guys tuning the car, is that this shit never showed up until they got it off the dyno. I was there even to watch it do several pulls to redline. The current power specs on the engine were: 279whp @6250 and 250 tq @5250

I can try to get some maps from them, but currently I dont have any.
 
Omega: RS-Motors in burnsville mn tuned the car. The only thing I can think of is that between the dyno and the road, he did several "last minute" adjustments to settle some things out, which is where I believe the problem started. The interesting thing is that I was able to do 3 pulls to redline (1st, second, third) before it started freezing up.

RS is an awesome shop, with two ase certifieds, the guy tuning has experience with dsm (he owns an evo), but like I said they arent specific and may overlook some mechanical things. He seemed very competent with the AEM software, so I guess we'll see what they come up with.

And omega, The first tune was a base map, which had a very rough idle, boosted 1k late, and even then, was way below the cars potential. It dynoed at 231whp and 195 ft/lbs on the basemap. Look above to see the new specs.
 
Sometime your clutch slips adn the rpms just stay there, without moving up. Because the clutch is still trying to catch. Most people realize this and let off the gas before the rpms increase for obvious reasons.

However; if you have a 6 puck, then I agree it is most likely something else. Sounds like ignition problem.
 
that was one of my first thoughts. the car is misfiring at OVER 18psi due to ignition. It however, ran fine on the dyno at 18, but they backed it down to 16 just to make sure there wouldnt BE any problems. what in the ignition would cause a wall at 5500?

I agree with your logic on the clutch. It is a 6 puck, and the clutch wouldnt just start slipping that hard all at once. there would have had to have been some sort of slipping going on while it was on the dyno. there was none.

day 6 of the car being in the shop, the guys at RS still havent found the problem. they spend all their time on the honda and toyota guys. im starting to get pissed. thanks for all the help so far guys. I'll call them tomorrow and tell them to check ignition and clutch just for shits and giggles.
 
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