Good evening everyone! Hope y’all have had a good holiday!

I am looking at finally adding some power to my time attack build. I began with suspension, then to weight reduction, and now I am fully caged, and have full aero + wind tunnel testing done!

I am wanting to finally add power to my time attack build. I currently have the issue of lack of top end power, and constantly pounding off rev limiter (simply because I cannot rev any higher and it’s quicker to hit limiter for a second, than it is to shift.) To combat these issues, I am wanting to rev to 7500 RPM (maybe even 8000rpm) and have the power extend all the way out too that.

I would like some real input on cams, plenums, etc… I really would like to stick to just a top end build, and not have to mess with the bottom end if at all possible.

Thanks!

 

Not possible in a DE, if you indeed had money for wind tunnel testing (quite expensive) then swap in a HR, which you probably should have started with if this was your goal. Best thing you could do is mess with gearing but revs on a DE are no go beyond 7100 and even that's pushing your luck.

 

If I was going to swap, I think I would go with a KA or an LS platform.
Wind-tunnel testing was done from a sponsor who wanted data on the Z chassis.
I have read on other forum posts and it seems like 7200 is the limit for a DE. I just wanted everyone’s opinion.

 

Cool, 7200 is the number Nismo provided if you are using their rod bolts, not in stock format.
My redline is set to 7000 but I hardly go there, most tuners will put you around 7000-7100 but it's not a good idea to live at that rpm constantly.

 

Just for reference, the reason being these engines throw rods at high rpm. Sasha threw a rod in his car before he got this new engine. Only way to sustain high RPM is to build for it and have a dry sump.

 

I would not (consistently) take an otherwise OEM engine to 7500rpm/8000rpm what so ever.

The recipracating forces on the bearings/rods/pisons are exponential in nature and will self-destruct.

Further, the DE oil pump is not designed to deliver oil to this degree and the cams/valves are not designed for this.

Last - yes, horsepower will increase but you are pretty far out of your torque band.

If you want more power than build the block, get a boundary engineering oil pump, and do it right - otherwise you’re asking for trouble.