Ok 392 Cam In 5.7 Or Not?

[Speedy 275]

557RWHP on a 5.7 with 8spi Maggie is making some power for sure. Thanks for the info bud. I put that at right around 50RWHP more than I'd expect without that cam.

Your MPH being 2 slower than CF3 raises my eyebrows though. That's what I mean by results being all over the place. Makes me wonder if tuning is the main issue with all the varying results. Did both of you guys have the same person tuning or ?

[rdrdr90 38]

Dauum! 557? Sheesh. Ain't no way I'm gonna get anywhere close to that on 8lbs.

[moparmedic 0]

Yes Tim tuned both cars. I was short shifting shifting at cf4, I found 6300 rpm was the best, on the street. Like I said seat time will get the E/T down. I have a 10lb pulley and hit 9lbs if it's cool. The long tubes effected my boost I lost boost. Mopar 280 has shorty headers and did not really loose any boost. We will being doing some data logging and highway pulls to see the actual difference in the 2 cars and the tunes in a few weeks. Dyno numbers meet squat to me I want the very low 11 the car is capable of running.

Both stock blocks of corse.

[TimeWaitsFNM 16]

FWIW my auto was at 528/503 with cam, heads, long tubes, 8lbs.

[345_CHLNGR 9]

Looks like I needs heads, Long Tubes, & Catless Mids to be where I want.

[BayouTiger 98]

I think too many people are too worried about what their boost number is. It's just another number. All that matters is that it is consistent. If you only get 9 lbs from the 10lb pulley setup, that's usually a good thing because it indicates you are less restricted.

[Speedy 275]

Exactly Chuck. It's likely making more power on less boost because of being more efficient. I was gonna do LTs on mine, but Arrington talked me out of it since it can create emissions headaches. That was a while back so things may be better now with ways to tune around the sensors to still pass.

[TimeWaitsFNM 16]

I am using high flow cats.

No codes, just passed BFE Texas inspection last month.

[Speedy 275]

The LTs move the cats further down stream and they don't heat up to the temp the computer expects and it trips a CEL for catalyst efficiency. I checked out two Challenger two weeks ago, both with LTs and both had the same CEL. One had a failed emissions test in the arm rest. I'm in TN.

LTs with high flows will pass visual inspection so if there is some tuning magic to get the CEL and all readiness monitors set it's no problem. Shutting off the rear O2s will get rid of the CEL but is NOT a solution as those monitors will show "not ready" in an emission test and the car will still fail. There may be new tuning solutions now that weren't available when I did mine, but I went with SRT shorites and SRT factory cats.

[BayouTiger 98]

Man, emissions testing in both Texas and Tennessee. WTF is the world coming to when even Bubba can't hotrod his car!!!

[Speedy 275]

You got that right Chuck. It's a huge racket here too. They're even trying to implement drive by smog checks that send you a nice ticket in the mail if the car doesn't pass. I think they already have them in CA. They usually put them on interstate on ramps so they get you while you're on the gas. They're promoting them as "convenience checks" here right now and there are only a couple and are avoidable, but I worry eventually they'll be the norm and we're screwed.

[ironchallenger 108]

the worst is canada...... trust me... you guys have it easy.

[TimeWaitsFNM 16]

Texas doesn't check, but some municipalities do like the Austin, Houston and Dallas areas I believe.

[chris1992 12]

It's too easy here. Drive up, pay them $20 for a 2 year sticker, they rip the old one off, stick the new one on, and your off. Nothing checked for!

[BayouTiger 98]

Yep!

[Guest Daparrothead]

Not here, I had to get AJ to tweak my tune to get mine to pass OBD II emissions test.

[concussion 29]

Jay, why not look into a 6.1 cam? Is it because of the VVT?

I gained similar power as those who had swapped in a sidewinder with my 6.1 cam in my nonVVT 5.7.

Can't ya lock the VVT out and run whatever cam you want?

Just asking questions... I love the repurposing of SRT parts to make a 5.7 faster.

[Speedy 275]

The 392 cam is quite a bit larger than the 6.1 cam I believe. 6.1 is 205/210 at .050".

I can't run a standard cam due to the VVT.

If there is a way to lock the cam and prevent the VVT part of it, I've never heard of anyone doing it or parts to do it with.

In all honesty, the VVT could be a very good thing if the proper cam could be designed. Nice power down low and up high without any sacrifices. The Comp 274 may provide that type of power in both the upper and lower RPM ranges, but the tuning is still questionable. Mike says he can do it, but charges by the hour for that type of cam due to the complexities of the tune, and has to have the car at his shop to do it. That gets to be A LOT of expense for a cam all told by the time I buy the cam at $900, install it, trailer the car to Mike, pay for tuning by the hour, and trailer the car back home.

ROI is too low for all of that IMO which is why I was looking at the 392 cam which he says is easy to tune remotely. I'm hoping we get some good news from 345_chalngr today with his Maggie 5.7 with 392 cam on the dyno.

[lakersfan7272 59]

Jay you would need an older non-vvt 5.7 block.

[Speedy 275]

Precisely.

[RT_6Speed 75]

It's too easy here. Drive up, pay them $20 for a 2 year sticker, they rip the old one off, stick the new one on, and your off. Nothing checked for!

Easy here too, we completely did away with inspections. in the olden days (when inspections were required) a regular inspection was $10. If your car wouldn't pass and you knew where the 'other' inspection place was it would usually cost $15 or $20

[concussion 29]

Thanks for the reply Jay. As I've never owned or wrenched on a VVT motor, I don't have the first hand knowledge I have with the 5.7.

I thought there was a way to pin the VVT, but moonshine as clouded my memory.

If I can help, just ask bud.

Continue fellas, this is a good read.

[Speedy 275]

Thanks buddy.

[1FST4DR 85]

We ve done a couple comp 274s . Maybe Mike could ask johan for some help/tips to keep your dyno session time reasonable.. Just a thought. Thought they do take a little more time to dial in it wasn't ever longer then 2 hrs on the dyno.. Hope this helps.. good luck

[Speedy 275]

Thanks for the info. The dyno time wasn't the big issue for me, it's all the travel and cost of the cam added to it. Mike said he picked up 100RWHP with the 274, so the gains are good, but cost for gains is what I question. I could likely do a little spritz of the happy gas for less and get the same or better power return.

I just wonder where all the 274 VVT cars are. We never hear from anyone that has one which sets off my spidey sense

I was hoping to see some definitive results from the 392 cam on 345_CHLNGR's car, but no dice. This is at 8psi from a Maggie on a 5.7 with 392 cam.

He said the tune is rich as can be at high 9's, but it's not gonna pick up 75HP even with a good AFR.