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2.6" or 2.7" pulley?



Did the GenIII or GenV question get answered? Doesnt make a difference as far as machining the snout goes, but is an important factor...

Either way, dont run that much timing... its not worth the risk. If you're running e85, think boost before timing. But that's just me...
 
You think James has gif diagram of the piston position in relation to the spark firing at different timing advances ? That would be cool
 
gtpsleeper said:
Did the GenIII or GenV question get answered? Doesnt make a difference as far as machining the snout goes, but is an important factor...

Either way, dont run that much timing... its not worth the risk. If you're running e85, think boost before timing. But that's just me...
Click to expand...

It's a gen III.

Why would 24* be too much if it's not knocking and the power is still increasing?

I am trying more boost. I plan to drop from a 2.9" to 2.7".
 
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You are increasing cylinder pressure a lot at that point with that much timing, and not much gain in power. It's a good way to chip a piston or push a gasket out.
 
The cylinder pressure spikes during a knock event are way higher than due to increased timing. 20* with knock is way more dangerous than 24* without.

I ran 24* all last year with the E85. I tried back to back to back runs last fall. 16* to 20* picked up 1 mph, 20* to 24* picked up another 1.5 mph.


I do understand that at 24*, if something goes wrong and it knocks, the result will be more severe.
 
I need to get to work on my e85 tune with the new 60s I added last summer.
Right now with s3 heads and s3 cam with a l26 bottom - most I've tried is 21 again
 
b4black said:
The cylinder pressure spikes during a knock event are way higher than due to increased timing. 20* with knock is way more dangerous than 24* without.

I ran 24* all last year with the E85. I tried back to back to back runs last fall. 16* to 20* picked up 1 mph, 20* to 24* picked up another 1.5 mph.


I do understand that at 24*, if something goes wrong and it knocks, the result will be more severe.
Click to expand...

Why do you want to run it that high? As you said, it's risky, and you'd run faster with a smaller pulley with less timing.
 
I don't necessarily want to run that high.....Which is why I posted this topic about running a smaller pulley.
 


Is there a reason you dont want to machine the snout? In all honesty, you need to be in the market for a genV if youre talking those pulley sizes. your setup on a genV with a 2.8 at ~18-20* will be fun and safe (except for maybe your trans that is...).
 
I already ground the fins off when I last had the snout off. No point in machining the snout if the 2.7" already fits. :)

Trying to do the most with the least effort. :cool:

I probably need rockers before a Gen5. But swapping pulleys is much easier. The car is already plenty fast for what I need. Just playing with simple stuff for now.
 
You can put a GenV on in about 2 hours and find a decent one for like $300.... 2.8 to 2.7 on a GenIII probably wont really net you that much due to efficiency anyway if were being honest.
 
a gen 5 will stay in it's efficiency range better with those pulley sizes. the swap is not that hard, really just need a throttle body adapter plate, the gen 5 lim, different bolts for the gen 5 sc, or you could port your gen 3 lim to work with the gen 5 sc.

I use this thread a lot to show the difference between the gen 3 and 5. it's not a big difference, but with the pulley sizes you are running it would be beneficial.

http://www.regalgs.org/topic/54470-geniii-vs-genv-the-truth/?hl=supercharger
 


So, I need nothing but the Gen5 SC and some gaskets? If so, then I will keep an eye out for one. I can handle two hours of work. :)
 
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