[RobbyBeefcake87]

Originally Posted by Jhunsberger

For another comparison RPM just did a 18 SS Auto with LTH catless, RPM cam package, Texas Speed PRC heads, MSD intake, roto-fab, and NW 103 TB = 513/449.

https://youtu.be/EWDhzA1S104

There are even variances with in their own cars. Here is an RPM built m6 that made 557whp on 93 supposedly. Different builds different specs possibly.

[ud03803]

Originally Posted by RobbyBeefcake87

This. E85 would go a long way for OPs car as well imo, especially with a 12:1 CR.

Did I not post that? I am on E85 - actually more like E77 though. It's the flex fuel stuff from Sheetz here in NC, which averages 74-78% I'd say.

[ud03803]

Originally Posted by KingLT1

Not all parts are created equal. You are not using Pray's heads, cam, or MSD. Pray routinely backs those numbers up with that combination of parts.

For starters the cam specs look odd for NA. Looks like a blower grind. Also you need a Ported 95mm tb minimum. I would also ditch the K&N for a Rotofab. If you want to make Pray power then use Pray's combination of parts.

There are some other variables too.

A8 vs M6. A8 shows 20whp difference between 5th and 6th gear pulls. M6 dynos 10 whp higher or so over a A8 in 6th.

Drag radials dyno lower then street tires.

Tuner...just because you had it tuned twice doesn't mean much unless it was tuned by one of the few competent Gen 5 LTx tuners across the country.

And likely one of the biggest factors...Different dynos. All dynos read different even with SAE correction. I wouldn't expect to see a 75whp difference on 2 different dyno jets between the same combination but I could see there being a 20whp difference easily.

All that being said if you addressed some of these things above, I wouldn't be surprised if your combination hits at least 550whp.

Thanks, good info. And you're right it is a blower grind. My initial conference with the builder I stated I wanted to procharge it eventually. They said this cam would work OK for NA but even better for boost. Your post gives me a lot of items to target to get the most out of what I have though so it's appreciated! The K&N is up for sale locally now. I'll save for the larger TB but I am saving for wheels and tires for the strip right now.

[RobbyBeefcake87]

Originally Posted by ud03803

Did I not post that? I am on E85 - actually more like E77 though. It's the flex fuel stuff from Sheetz here in NC, which averages 74-78% I'd say.

My bad, did not see you had E listed.

[supersportss]

Originally Posted by KingLT1

Not all parts are created equal. You are not using Pray's heads, cam, or MSD. Pray routinely backs those numbers up with that combination of parts.

For starters the cam specs look odd for NA. Looks like a blower grind. Also you need a Ported 95mm tb minimum. I would also ditch the K&N for a Rotofab. If you want to make Pray power then use Pray's combination of parts.

There are some other variables too.

A8 vs M6. A8 shows 20whp difference between 5th and 6th gear pulls. M6 dynos 10 whp higher or so over a A8 in 6th.

Drag radials dyno lower then street tires.

Tuner...just because you had it tuned twice doesn't mean much unless it was tuned by one of the few competent Gen 5 LTx tuners across the country.

And likely one of the biggest factors...Different dynos. All dynos read different even with SAE correction. I wouldn't expect to see a 75whp difference on 2 different dyno jets between the same combination but I could see there being a 20whp difference easily.

All that being said if you addressed some of these things above, I wouldn't be surprised if your combination hits at least 550whp.

I agree with King you want pray numbers use pray parts

[Doc Oc]

Originally Posted by ud03803

You make a very good point. In fact, the tuner actually said, "look at that weird torque curve(going up and down), I bet it's spinning the tires on the dyno".I didn't know this could happen lol

Happens all the time. I've worked part time at a dyno/speed shop for the last decade and have seen massive differences simply from spraying the tires with belt dressing. Might want to ask your guy to do that next time if you've got any reservations. It can make a big difference.

[ud03803]

Originally Posted by supersportss

I agree with King you want pray numbers use pray parts

I hear ya - right now I have the parts I have - too expensive to replace. I think I am good with the nitrous numbers though, I can always go up from there ;-) I think many good points have been made and it makes sense to me now. I appreciate everyone's thoughts, this really did help me understand. If I had to do it all again, I would have had them gap my rings, then boost the hell out of it with a procharger and call it a day. Lessons learned lol