Built Motor Low Dyno Numbers

[thatonenozz]

Well, if that's at the wheels and Lund tuned it I don't think it's bad at all. 5.2 liters with those numbers is pretty damn good. Do you know which Lund rep tuned it? Also, how are those stage 3 cams to handle on the street?

Thanks man! Nice to see it all finally come together after 4 months. The car was tuned by Jon Jr. himself so I’m not sure there’s anyone who coulda done a better job at it. The Stage 3 cams on the street don’t make much of a difference. The power band is definitely higher so it doesn’t really feel like the power comes on much before 4K, but as far as driveablilty and sound it’s like stock to me.

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[Notagain]

What fuel? Edit: I see you said E85.
What timing?
What the VCT doing?

Cam tuning is a HUGE factor in these cars.

Ported heads and compression over the other 500ish whp CJ CS3 cam E85 setups.

Hmmm doesnt seem too bad but I would have expected 550ish whp too.

 

[Plimmer]

Here’s the before/after flow data Slawko published for their CNC program on the 15+ heads, though I can’t say whether or not mine were individually flowed. Likely not. I guess I really expected more than a 5-10hp gain from the compression bump. The extra .2L of displacement is pretty small as well obviously. Dammit I guess I just had higher hopes. Is compression too high to change my mind and turbo? :lol:

I'll add my 0.02c. Your cams have a max lift of less than 0.500', and modified head flows less at low lift than a stock head, and only slightly more at max lift, so actually your modified inlets are probably moving less air than stock.

 

[Notagain]

I'll add my 0.02c. Your cams have a max lift of less than 0.500', and modified head flows less at low lift than a stock head, and only slightly more at max lift, so actually your modified inlets are probably moving less air than stock.

Less air? Ported they certianly have a higher flow rate.

Do you mean velocity? I believe port velocity means alot that not many people think about.

But I do certianly get where you are going here.

 

[Plimmer]

Less air? Ported they certianly have a higher flow rate.

Do you mean velocity? I believe port velocity means alot that not many people think about.

But I do certianly get where you are going here.

Yeah, less flow at .100, less flow at .200, roughly same at .300, nice improvement at .400 and .500. Rest of lift is irrelevant because the cams don't lift the valves that high. Also don't forget the valve passes low lift twice, as it opens and as it closes and is only at full lift once, so low lift flow is very important.

And to your point, maybe a loss of velocity as well, so no pumping gains.

 

[Anthony 05 GT]

Thanks man! Nice to see it all finally come together after 4 months. The car was tuned by Jon Jr. himself so I’m not sure there’s anyone who coulda done a better job at it. The Stage 3 cams on the street don’t make much of a difference. The power band is definitely higher so it doesn’t really feel like the power comes on much before 4K, but as far as driveablilty and sound it’s like stock to me.

I wouldn't be unhappy with this at all. Break that motor in and it will probably dyno near 550. What matters is how it feels and driveability. I agree, Jr tunes well and as good as anybody.

 

[Notagain]

Yeah, less flow at .100, less flow at .200, roughly same at .300, nice improvement at .400 and .500. Rest of lift is irrelevant because the cams don't lift the valves that high. Also don't forget the valve passes low lift twice, as it opens and as it closes and is only at full lift once, so low lift flow is very important.

And to your point, maybe a loss of velocity as well, so no pumping gains.

Now were talking and agree 100%

No one makes "big" cams for these and if they do list them as "custom" spec or "vendor" spec so no one knows the specs.

*cough* *cough* JPC and MMR.

Not a chance in hell Id buy cams without knowing the specs!!

 

[Stang8psi]

I noticed that people were talking about a turbo? Was the motor setup (ring gaps) for boost?

 

[thatonenozz]

I noticed that people were talking about a turbo? Was the motor setup (ring gaps) for boost?

Haha turbos was just a joke. The motor was built specifically for an N/A application so I don't think it'd be a good idea.

 

[Stang8psi]

Haha turbos was just a joke. The motor was built specifically for an N/A application so I don't think it'd be a good idea.

lol. agreed

 

[thatonenozz]

Ive read on another fully build N/A combo that they were experiencing vacuum behind the throttle body on a setup like this and had to move to a monoblade to keep that from happening. Might be able to free up some if this is the case here. And I agree with the comments above about cam specs. These heads really need a bigger cam. Or at least take advantage of the lift if the duration stays the same.

Vacuum behind the throttle body? Can you elaborate a bit. I know the mono flows better but I’m not familiar with a vacuum issue. Do you happen to know how much HP the other guys freed up by going with the mono?

Also regarding the cam, does anyone make anything that you know of off the shelf that would suit these heads well? Or are there any companies that you can give the Head flow specs to and have a cam made to take advantage?

 

[w3rkn]

FWIW:
If you look at the dynograph, it seems that the engine doesn't get enough air at the top and the HP tapers off. It shouldn't.

Air, or fuel...




Also, what was the point of those specific cams, or their application?

 

[thatonenozz]

FWIW:
If you look at the dynograph, it seems that the engine doesn't get enough air at the top and the HP tapers off. It shouldn't.

Air, or fuel...




Also, what was the point of those specific cams, or their application?

I was thinking the same thing. I was expecting peak power a little above 8 but it starts flatlining way before that. If it kept that same slope I would have been a lot closer to where I thought I should have been. Do you think the Twin 65 TB could be enough of a restriction to cause that? Or the fact that the cams are wrong for the port job on the heads?

Bought the cams because I saw guys making pretty respectable power N/A with them and I was trying to get as much power as i could out of this thing.. Application is road course tracks so sustained high RPM

 

[w3rkn]

I was thinking the same thing. I was expecting peak power a little above 8 but it starts flatlining way before that. If it kept that same slope I would have been a lot closer to where I thought I should have been. Do you think the Twin 65 TB could be enough of a restriction to cause that? Or the fact that the cams are wrong for the port job on the heads?

Bought the cams because I saw guys making pretty respectable power N/A with them and I was trying to get as much power as i could out of this thing.. Application is road course tracks so sustained high RPM

Yes, so you want a deep breathing engine. It needs as much air as it can get at 7,000rpms.

I would look at intake, or even intake temps. Also, larger engine, what radiator..?

 

[WildHorse]

http://www.hipermath.com/engines/throttle_body_size

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