How will the stock bottom end hold up to a apten and 6lb pulley? From what I have read the apten ups your boost by about 3lb's or so which I wouldn't see to be ideal, I figured it would just be a greater quantity of air at the same pressure ratio.... Any input?

-Sly

 

I asked the same question at http://www.lightningrodder.com/compo...viewtopic&t=75

Might reassure you to see that. Rob02 runs the same combination, plus nitrous. It's all about the tune. The very safe, rich tune.

 

lol cool man, do you have yours installed yet?

-Sly

 

i say kaboom.

 

Not yet. I'm in the middle of a divorce and having some setbacks with money because of my wife. Hopefully in about a month when it's all over.

 

IMO here:

Yes you can run that heavy of a induction. But in order to keep it "safe" your gonna have to pour the fuel to it. 8# guys are the same way. IMO it's just over killed. Your spinning the blower way past it's efficiency range (consuming MORE power) and then drowning the overheated charge with excess fuel.

IMO that's just too close to the edge for how strong the stock bottom end is.

I may be giving up a little in power w/my 4# lower vs something bigger. But I'm hitting 16 psi of boost, running mid 12s, and fully expect it to live til I one day decide to get a built motor.

Rich

 

So what do you guys think would be a better setup, a 6lb pulley or a 4lb with an apten?

-Sly

 

Friend makes ~430 SAE on the race side of his program. Stock block, Apten port, 6# lower.

He ran a 12.7 @ 108 on F1's with it.

His tune is VERY safe - saw the graphs, and Sal tuned it to a 'T'.

I'm running a 4# lower, similar mods (with hi-flow cats instead of stock cats). I make ~405 SAE on my street tune.

I ran a 12.8 @ 107 the same night on 26" ET Streets.



6# lower + Apten + Safe tune = ...just WATCH THE 2-1 and 3-2 kickdowns!!!! They'll KILL ya!

 

Once again, Rich hits it right on the head. Tempted to make this quote my sig line.

But the knuckleheads will continue to overdo it and continue to blow motors. Then they will come here and boohoohoo.

 

If we all get in the wayback machine, we can see talk about how going over 1 or 2lb's is a ticking timebomb!

-Mark

 

Rich, he said ported eaton, so heat won't be that much of an issue.

 

Hope they don't drug test bar candidates in your state.

Ported, smorted. With a 6 or 8 lb pulley, you have turned an Eaton into a power-consuming, air heating monster.

 

Dunno whether that's true or not, but what is your point? You can't compare statements made in the infancy of Lightning tuning with those made today. We now have the benefit of reams of real-world data -- and the solid conclusions that can be drawn from that data.

What does that data show us? The stock ECU can compensate for 2, 4, and perhaps 6 lbs over stock. It will be reliable, but will not make as much power as with a chip.

It's poor or overly aggressive aftermarketing tuning that blows engines, whether on a 2, 4, 6, or 8 lb pulley. Raise the rev limiter and shift points? Congratulations, you have now increased the #1 non-detonation factor for broken rods. Increase the timing? You are asking for detonation. Lean it out for power? Same. Remove torque reduction? Pray for your tranny.

TANSTAAFL.

4 lbs over stock with a conservative tune is almost OEM-level reliability. Any power beyond that comes at the increasing expense of reliability/margin for error.

Rich knows that of which he speaks. All would be wise to listen up.

 

Got some full color graphs to support that claim?

Maybe if you use the search button, you'll see the IAT2's on ported Eatons to be significantly lower than none ported.

 

Here's one:

We are beyond the end of the lines stock. With a 6 lb pulley, you are off the chart.

No simple port job can change the physics of what is happening in the supercharger, of which a port job leaves the rotors unchanged. I have seen the IAT2 data posted here. I don't buy it. Something is wrong with the data -- the difference is too great to be explained by port reshaping. Something else is going on there.