jetlag

iTrader: (32)

So...what is the different between Speed Inc.'s SI4 and Texas-Speed's 228R?(other than the LSA)

SI4 228/228 .588/.588 113
228R 228/228 .588/.588 112 or 114

WS6Jim

iTrader: (9)

The name the packaging and the place which you buy them from.

SOMbitch

iTrader: (8)

I would GUESS the lobes. The 228r is on XE-R/XE-R Comp lobes. Not sure on the SI cam.

Jason 98 TA

iTrader: (4)

The current 228r is definately XER lobes. If you'd like to checkout some engine dyno data from our cam swap testing give us a call. We can fax you over tons of dyno results!!
http://www.texas-speed.com/shop/item...d=167&catid=44

Baseline
http://www.precisionracecomponents.com/stock.jpg

228R
http://www.precisionracecomponents.com/228r.jpg

14k

Bumping up an old *** thread. Since it was never answered.

I8UR4RD

iTrader: (16)

seems like it was answered to me. id check to see what lobes the SI4 has, and see if they are going to provide the results your looking for in the cam. I do not want to be biased, but I can say my 228r @ 114 netted me 393rwhp with stock heads through an auto

PREDATOR-Z

From what i can gather they are the same cam on Compcam XER lobes just different LSAs

VincesSS

iTrader: (1)

Agreed with above.. can't imagine 2 different lobe designs having identical lifts at the same duration.

JoshuaGrooms83

iTrader: (2)

so what does the 1 degree in LSA really change?

Remnant-of-VII

The idle characteristics and where the power band starts and ends on that cam.