How to improve top end?

[turboost]

What is the limiting factor as to why the motor dies after 2900rpm? Is it intake manifold? turbo? Heads? cam? Fueling? At 95mph I am real close to 3000rpm, is it going to fall on its face after that?

 

[XcumminsX]

ecm programming...

 

[tdecosta]

105 and still pulling (last week), definitely not the top end. Did not catch tach reading, tho. Very stable, no vibrations,etc. On stock wheels & tires since 285 65 18's not in yet. Even so, I would expect that top speed is electronically-limited, rather than drag-limited.

 

[Jengle]

Mine run on the dyno, shuts down at 110mph, I think it starts defueling somewhere in between 105-110. I also had it pulling hard at 100 but wouldn't get over 105-108 or so on the highway. Somebody makes a box that cuts out the top speed limiter, it was in the TDR mag, I can't remember the name off hand.

 

[KLockliear]

You should check out the turbo drive pressure at those RPM's with that stock turbo.

 

[lmills]

Somebody makes a box that cuts out the top speed limiter, it was in the TDR mag, I can't remember the name off hand.

I believe it is BD that makes that

 

[Patriot_RAM]

I thought mine was limited by the rev limiter at 108 and about 3100 rpm. Unil I went from the 265's to the 315's. Before I got my spedo corrected, it again went right up to 108, but the rpm's were 3100. Considering the size correction, I was probably doing nearly 120mph. As soon as I got the spedo reprogrammed, still maxed at 108, bit the highest RPM is now around 2,900 but sure didn't have the feeling of before the correction.



Definitely ECM controlled.