What elevation are you at and what temp was it outside?

 

14psi for daily driving? No way, girl. That's WAY below stock, and your high boost is only stock boost level. You don't really conserve gas by lowering the boost. You conserve gas by NOT BOOSTING. Keep your low boost at 20-22psi, then set your high boost to 25-26 only to be used on race gas.

Yes, granny shifting can hurt you by half a second, if not more. It's critical to shift very fast at the optimal shift point in order to keep the turbo spooled fully and the engine in the meat of the powerband. However, you still need to determine how and why you were hitting the rev limiter in 4th but only trapping 104. That is a huge red flag right there that needs to be addressed. My inclination is that the car itself is fine, but the timers are off.

 

Could the intake manifold be the problem? I remember in the 3SGTE world, people would actually lose power when getting an aftermarket intake manifold with the stock turbo because the turbo couldnt flow enough.

 

All those mods and she is only making 285.63whp??? Wow and that must mean her stock numbers were truely horrible.

 

Not necessarily. It could mean she has a very strange combo of mods that don't make good power. Like why in the world would she have an intake manifold and a MOTEC with a nearly-stock car? The tune could be poor, she could be running low boost, she could have a boost leak, the intake manifold could be problematic. My guess is her car in stock form would have dyno'd only a little less than it does now.

 

Clutch could be slipping a little bit up top causing it to bounce off the limiter.

Although a slipping clutch usually happens around peak torque.
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It does, so that theory is not likely

 

If it starts slipping at peak torque and slips all the way on up to the rev limiter that would explain the miss match between trap speed and RPM.

Keith

 

Well peak torque is at 3500-3800, and she wouldn't be below 5500rpm on the track, so it's unlikely to slip in that situation unless it slips like a madman all the time when daily driving. She didn't indicate that was the case, so I dismissed the notion. It is possible to burn the clutch on a launch and then continue the slip all the way down the track. I found that out when I tried a hard slip from 7k on my 4-puck just to see how much it could really take, and I ran a 12.7@103. I had absolutely nothing up top as if the clutch never fully engaged. I don't think this happened to her, and it has only happened to me once in 200+ drag runs, but it is possible.

 

The slipping clutch idea has got me thinking, cause the car pulls hard to about 5k then the revs continue but it doesnt pull as hard?? could this be why I only got 104mph at about 7.5k in fourth gear??? Does anyone know what the top speed in 4th gear is? in the 6 speed box and at what rpm?

 

I've already answered the questions about 4th gear in the 6spd at the stock rev limiter. Read the previous posts.

If your rpms shoot up at 5k without the car accelerating, then that should have been the first thing you told us. I have no idea how it can happen right at 5k, since that is well past peak torque, but if your revs go up without the car going faster, then the clutch is slipping.

Go out and test your clutch by putting it in 6th gear at 2500rpm and hammering the gas. Right when it starts to build boost, if you notice the rpms jump up without the car accelerating hard, then the rpms fall back down in a few seconds and grab, then the clutch is going.

 

ill try that out, my mechanic reckons it could be only when the clutch heats up. Ive only done 3500km on the car.

 

Wow, an Australian saying "reckons." I had flashbacks to my childhood in Alabama when I read that...

 

If you clutch is onyl slipping at high rpms then that doesnt make sense to me. Because if a clutch is going to slip it is going to do so at peak tq which is def not anywhere near 7000rpm. I would advise you to try out wat warr said and if that be the case then a clutch upgrade is due. Good luck to ya. And take some of those mods off please

 

Which mods do you suggest i take off?
im going to add exhaust 272 cams and an exhaust gear. Im leaving the intake cams as they are MIVEC on the IX.