Fishmasterdan

Current cam doesn't rev far enough. Nitrous motor falls off pretty hard at 6800. Needs to go to at least 7200 thru the traps.
decent power but needs to spin a little higher.

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On the bottle red line was actually going to be over 800 but spun on the Dyno.

99 Black Bird T/A

iTrader: (4)

Bullet has an excellent reputation and does outstanding work with LS cams. Can you try VHT at the dyno for the rear wheels? Maybe sticker tires too? The curves look a little strange to me maybe the tires were slipping some early in the dyno run. I'd want to know what that cam is really capable of doing before thinking about replacing it.

What intake manifold?
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Given that no details are provided about the car / truck, engine size, displacement, transmission, gears, weight and so it will probably be hard for anyone to make cam suggestions.

Fishmasterdan

It's a 370 super Vic. 4150 tb. 4.30 gears with prc 237 6 bolt cathedral heads with a glide.
LIFTINTAKE FLOW EXHAUST FLOW
.100" 66 CFM 57 CFM
.200" 147 CFM 117 CFM
.300" 225 CFM 170 CFM
.400" 284 CFM 206 CFM
.500" 325 CFM 227 CFM
.600" 334 CFM 235 CFM
.650" 339 CFM 241 CFM

Fishmasterdan

I'm very happy with the power just looking to run it out a bit on the big end. It falls flat at 1000' just wanting to extend power band another 3 to 400 rpm.

Polyalphaolefin

What's the displacement, compression, fuel, and header size/design?

Fishmasterdan

370. 12.8/1 .e85. 1 7/8 turbo headers forward and down with 3" collectors.
Forgot 1 very important detail. 4700 stall. Will flash to 4700 on the hit and 5300 on the juice. Never street driven.

wannafbody

iTrader: (2)

What is the car? Can you swap to a MSD intake for your application? That hp curve looks like it peaks early with your combo. I have a 227 cam and peak at 6400 rpm with a DLS2 intake.

99 Black Bird T/A

iTrader: (4)

Sounds like a nice set up! What size tire?

Any advance ground into the cam? What's it installed at?

Retarding the cam timing 4 degrees might bump the rpm up ~200 rpm.

Would that be worth tweaking the cam and degreeing the cam with 4 degrees of retard?

Fishmasterdan

Had an lsxrt on there before. Went to a single plane to extend rpm band. Plus the plastic intakes don't like to distribute juice after about 200 shot. I run 2 kits capable of a 400 shot. The Dyno hit was only a 150 shot. The single planes really pick up on the bottle. Couldn't push it any farther on the Dyno due to traciton issues.

Fishmasterdan

29.5 10.5
Good question on the advance. Cam card doesn't say. I installed it straight up.
Thought about retard a couple but that will kill my shift points( later to peak in the rpm band). I like where it peaks now just want it to hold on for a few hundred more.
Reached out to cam motion for a new cam. Just looking for real world experience. Seems as if all the normal cam folks stay way to conservative.

Polyalphaolefin

hmmm... that cam sounds about right for your setup. The EVO and IVC seems about right. (assuming 3-4* advance ground into it which is normal)

I'm curious if 1-7/8" turbo headers are sufficient to handle the extra exhaust mass from the nitrous. Running your combo through Pipemax calls for a 2" primary size x 26-29" long into 3.5" collectors. I'm thinking your headers are choking it off and not letting it rev.

Fishmasterdan

I don't disagree on the exhaust on the juice, but it won't carry out n/a. That seems to rule out the exhaust n/a? I was told from bullet it would be a pig on motor, which I'm ok with but why won't it rev out any further without falling off? Make me think the cam is holding it back. I see other Dyno graphs holding on to power all the way to 72 7300 with full exhaust.
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spanks13

iTrader: (5)

Do you have the full cam card?

Ls7colorado

iTrader: (3)

What valve springs?

Fishmasterdan

I do. I will have to try and find it.

660 capable valve springs.

JoeNova

It peaking and falling off that early isn't a natural occurrence, there is a mechanical issue there.

I would probably start checking lifter preload, shimming the valve springs up .020", and making sure the converter you have isn't a junk shelf unit that's made for your typical 350.

Fishmasterdan

I replaced the converter. The last one wouldn't hold. I was under the impression when the converter is junk it just spins to the moon.
Don't valve events show up as jagged lines?

Fishmasterdan

Ls7colorado

iTrader: (3)

Darth_V8r

iTrader: (4)

There is nothing about your combo that should not rev. I suspect valve float. That curve is not power falling off. That curve is the engine trying to tell us something.

You said you have 660 capable springs. What seat pressure, what open pressure?

What about pushrods? You should be running 11/32 or maybe even open the bosses for 3/8.

Also what lifters? What rockers?