Looking for cam upgrade. Need cam gurus Dyno inside
#1
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Thread Starter
Looking for cam upgrade. Need cam gurus Dyno inside
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.
On the bottle red line was actually going to be over 800 but spun on the Dyno.
decent power but needs to spin a little higher.
On the bottle red line was actually going to be over 800 but spun on the Dyno.
#2
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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?
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.
What intake manifold?
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.
#3
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Thread Starter
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
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
#6
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Thread Starter
Forgot 1 very important detail. 4700 stall. Will flash to 4700 on the hit and 5300 on the juice. Never street driven.
Last edited by Fishmasterdan; 03-09-2019 at 09:11 AM.
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#9
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Thread Starter
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.
#10
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Thread Starter
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.
#11
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.
#12
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Thread Starter
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.
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.
#16
Restricted User
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.
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.
#17
TECH Apprentice
Thread Starter
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.
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.
Don't valve events show up as jagged lines?
#20
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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?
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?