Could DI be a limiting factor of peak RPM?

Reply Subscribe

Thread Tools

Search this Thread

10-23-2013, 02:38 PM

#21

Graham Behan

Instructor

Member Since: Jun 2000

Location: Decatur Indiana

Posts: 121

Likes: 0

Received 0 Likes on 0 Posts

Quote:

Originally Posted by VIN666

Ok, first of, I don't want this to turn into a pissing match.
But while you seem to disagree with my concern, you agree at the same time?!

Again, does anyone know at this point if the stock DI system is capable of supporting both added power and rpm?

A t 6750 rpm it will support 660 hp with 5.95 ms inj pulse width.

This is supercharged so there is about 90 hp in parasitic loss.

Graham.
P.S Engine dyno

Reply Like

10-23-2013, 03:20 PM

#22

VIN666

Pro

Thread Starter

Member Since: Sep 2008

Location: NY

Posts: 635

Likes: 0

Received 0 Likes on 0 Posts

Quote:

Originally Posted by Graham Behan

A t 6750 rpm it will support 660 hp with 5.95 ms inj pulse width.

This is supercharged so there is about 90 hp in parasitic loss.

Graham.
P.S Engine dyno

Don't have a Mr. Burns "Excellent" smiley, but I could use one right about now.

Reply Like

10-23-2013, 04:13 PM

#23

obzidian

Safety Car

Member Since: Oct 2007

Location: Miami Fl.

Posts: 3,987

Likes: 6

Received 19 Likes on 12 Posts

St. Jude Donor '09

All hardware (and software) have limits. That is the reason why we have tech sections in forums! Now where the limit is.... I dont think any truely knows until stuff starts going wrong. I suspect their is enough for a decent increase in power but if you're interested in a 2000hp+ setup then you might want to stick with a lsx.

Reply Like

10-24-2013, 09:23 PM

#24

arghx7

Intermediate

Member Since: Jul 2013

Posts: 43

Likes: 0

Received 0 Likes on 0 Posts

Quote:

Originally Posted by Graham Behan

A t 6750 rpm it will support 660 hp with 5.95 ms inj pulse width.

This is supercharged so there is about 90 hp in parasitic loss.

Graham.
P.S Engine dyno

That's 240 crank angle degrees of injection time, presumably with SOI of around 320... should give EOI of ~80 BTDC. So that's actually pretty good headroom in terms of injection timing window.

Thanks for the input.