Stuck on Manifold choice Sniper vs. 302

WestCyril · Apr 10, 2017

I would go with a Boss as it has been proven to be one of the better FI manifold options. Plenty of turbo and blower cars pushing 20+psi through them and make crazy power. Locally the edlebrock lost power when compared to a boss manifold 1100+ turbo car.

I would go boss intake or mmr or the new holley sniper high ram option.

BMR Tech · Apr 10, 2017

MyLilPony said:
The issue is there is a magic spot that hits at about 7k where you feel it begin to stall. Watching Boost climb and power fall flat is a bit irritating. At 7k I am at about 11psi and at 7750 I am at 12.4. I want to recognize the power of that extra 1.5 psi will give me during the rest of the climb.

Most pick up ~30whp from a manifold swap at peak and I fully feel it is due to the increase efficiency the manifold brings. So I am not adding extra stress that isn't already present as the boost levels will remain the same (drop for others) for me. So if I can gain whp through efficiency why not?

To hit 750 at 6800 I would need to pulley down causing more stress lower in the rpm band. Low rpm high boost is bad I think we would all agree. Plus the coyote likes to rev and with a centri making Boost based on rpm I would rather rev higher and have less Boost drop off.

I tend to agree with your theory overall, however I personally do not agree in this scenario.

My reason is because, these 15+ engines are efficient. You are not going to hurt them by adding more boost via a Centri blower, I promise. PD blower cars can hit them with 15psi from the get go and last for a long time, so consider that too.

In your specific case, I would rather add some grunt down low and rev to a max of 7500 then to increase the power curve to where you HAVE to shift at 8K+ to make the curve more effective.

This is my thinking with a stock motor. If you run the optimal shift RPM on a stock manifold centri car you will see that even with the decrease in the curve, the optimal shift will still be significantly higher than what most would think. :cheers:

BMR Tech · Apr 10, 2017

[MENTION=15176]MyLilPony[/MENTION] do you have a good dyno sheet that you can share of a 700-750rwhp Centri car with a stock manifold?

whatsup62 · Apr 10, 2017

WestCyril said:
Locally the edlebrock lost power when compared to a boss manifold 1100+ turbo car.

Interesting? do you have any data you can share? What range did it loose its power in the comparison and by how much? Was there areas where the E performed better or not? Curious minds want to know.

MyLilPony · Apr 10, 2017

BMR Tech said:
[MENTION=15176]MyLilPony[/MENTION] do you have a good dyno sheet that you can share of a 700-750rwhp Centri car with a stock manifold?

Here is a before and after of [MENTION=15779]z06psi[/MENTION] when he did his sniper manifold swap. Runs are to 7700 even though the dyno shows otherwise. He lost 1 psi with the manifold but he also added headers.

MyLilPony · Apr 10, 2017

Here are two other stockers

dubster99 · Apr 10, 2017

Haven't had mine on a dyno yet, but it pulls like a freight train to 7500 with the boss.

WestCyril · Apr 10, 2017

whatsup62 said:
Interesting? do you have any data you can share? What range did it loose its power in the comparison and by how much? Was there areas where the E performed better or not? Curious minds want to know.

the manifold just didn't have any low-mid range benefits and actually saw a lose in both power and torque compared to the boss on same car, same boost levels.

I can probably source a dyno graph. loses were enough to go back to the boss manifold on the car. Top end appeared to be the same, not much to be seen on a car seeing 30+ psi of boost on the top end

MyLilPony · Apr 11, 2017

dubster99 said:
Haven't had mine on a dyno yet, but it pulls like a freight train to 7500 with the boss.

[MENTION=9648]dubster99[/MENTION] did you lower the motor or just cut the hood? Can you post pictures of where you made cuts if you went that route?

wildcatgoal · Apr 11, 2017

I was under the impression you only needed to lower/cut with the CJ, not the Boss? Eh... been wrong before.

BMR Tech · Apr 11, 2017

MyLilPony said:
Here is a before and after of @z06psi when he did his sniper manifold swap. Runs are to 7700 even though the dyno shows otherwise. He lost 1 psi with the manifold but he also added headers.

I would love to see this graph in SAE and standard/common scaling form.

From the looks of it, that looks very nice and promising - but then again, that is a comparo of a stock mani with stock headers, VS sniper with LTs?

Hmmm

Why can't anyone just have a normal looking graph. lol

BMR Tech · Apr 11, 2017

I like the Y2 graph - but I wish it was RPM, not speed.

whatsup62 · Apr 11, 2017

wildcatgoal said:
I was under the impression you only needed to lower/cut with the CJ, not the Boss? Eh... been wrong before.

Nope Boss also....that's why I went the route I did. Also wanted to keep strut brace (for looks).

MyLilPony · Apr 11, 2017

BMR Tech said:
I would love to see this graph in SAE and standard/common scaling form.

From the looks of it, that looks very nice and promising - but then again, that is a comparo of a stock mani with stock headers, VS sniper with LTs?

Hmmm

Why can't anyone just have a normal looking graph. lol

lol figure 30/40 for headers and the rest fro manifold. I haven't seen anyone improve in the higher RPM's from headers, gains sure, but not the flat spot.

One thing I thought was interesting was that Z06 lost boost and gained almost all the way up the chart especially up top, even if you split the gains.

The y2 graph was from [MENTION=12006]Deadmau5[/MENTION] maybe he has one with RPM?

BMR Tech · Apr 11, 2017

I found a solid graph. This is 93 octane on a Procharger.

In this scenario, with the stock manifold, shift points would likely be optimal around 8K RPM, or even higher.

In this same scenario, it would take approximately 2.5 - 3 more psi to make 750 whp. Of course, this is a 93 octane tune up so it will have to make more boost to make 750.

This thread has me very curious to see a direct comparison. Dyno and track. ;)

Stuck on Manifold choice Sniper vs. 302

WestCyril

Well-Known Member

BMR Tech

Well-Known Member

BMR Tech

Well-Known Member

whatsup62

Well-Known Member

MyLilPony

Naw It's Stock

MyLilPony

Naw It's Stock

dubster99

Well-Known Member

WestCyril

Well-Known Member

MyLilPony

Naw It's Stock

wildcatgoal

@sirboom_photography

BMR Tech

Well-Known Member

BMR Tech

Well-Known Member

whatsup62

Well-Known Member

MyLilPony

Naw It's Stock

BMR Tech

Well-Known Member