charley3 wrote:That's very useful info, if your memory is correct. Get your dyno sims recreated so we know for sure!IH 392 wrote:I lost all my dyno sims in a computer crash!but IIRC?, the OE OBDII cam fell right between the 229 and 230 (discontinued) cams, they gave better low end, the OBDII cam will pull HARD right until it hits the revlimmiter in a 4.0
As displacement increases per said cam, the RPM band drops some.
If I'm not mistaken there was a guy here not long ago who posted sims between the obd2 stock cam vs the mopar vs the comps actually. It was the obd2 advanced 4* actually from what I've got written down.
Fwiw I choose the mopar stage 2 and 1.7 roller rockers. That should put me up around the 30ab discontinued cam with stock rockers. Its in a 4.2l stroker, full port, .038 quench with only 9.0:1 compression as we wanted it to live on 87. When out wheeling in the booneys 87 is about all you'll get sometimes.
I've been waiting on christuned for my ecu that he was supposed to socket but it's been 6 weeks since he's had it and it's gotten no where. I officially told him I wanted my ecu back yesterday I was over waiting. No money exchanged hands and I'm sure it was a high priority over work and what not. I'm hoping to pick up a spare working ecu and ship it to him to see what he can do that way I can drive my jeep.
Found the graph. Appears to be a stock 4.0 with the mopar, obd2 +4* & the comps.
I'll not when I looked at the obd2 cam it was like 200+ a few months ago. I dropped that idea in favor of the mopar with mopar lifters for 230 to my door on ebay. Mopar 229 that is.
I'd take the obd2 +4* over the comp 232. Obd2 Has most "low end" best for 1800-2000rpm cruising. The comp 232 really sucks in that range. Hell the obd2 beats the comp until about 300 rpm where the are about even until 4000rpm. Then the comp232 makes a few more hp & torque till redline. Honestly the added wear & need for valve springs & what not isn't worth the gains on the comp 232 cam. I'd even go so far as to call it a lose since your loosing to a stock cam in the rpm window most used. The ond2 is perfectly stock and will be healthy for many hundreds of thousands of miles.
The mopar 229 vs the comp 231 the real meal ticket I think. Its matching it within 5-10hp & torque. And I'm running mine on stock springs which never hit coil bind ect. Was just fine for my mopar 229 on 1.7 rockers.
I'd imagine the 228 to be +5-8hp & +5-8ftlbs over the Obd+4* cam honestly. With more potential for power with a bit more compress, head work ect.
I was also told the ramp rate on the comps was fairly high causing springs and valve seats to wear faster and make for a very noise valve train. Not sure on the truth behind it but it seems logical. I expect more wear and noise from a "aftermarket" cam that's obvious. But was told the ramp rate on those was more than most I guess? More than my mopar way more than the factory camp?