Factory blower vs Whipple options

[2013 ZL1 #7860]

Originally Posted by Dega Man

Very Impressive numbers with stock heads. Are you on nitrous, E-85 or meth to achieve 763 RWHP? One of mines is making (SAE) 733rwhp (A6) on pump gas with Livernois head work and goodies.

E70, nothing else.

1.34 60 foot so far and over 600 1/4 mile passes. Oil samples every 1K come back pristine...

[Dega Man]

Originally Posted by Can'tHave2MuchHP

Frankly I don't really care what certain people have done out there. 9.55 + 2.55 is entirely too much. No need to argue. While it can be done and people do it, it's kind of like crack, sure it's done but no it's not good for longevity and no you can't tell side effects until it's too late, in this case, expensive.

Yea it is obvious that you think you are MR. EINSTEIN on everything. However we just removed a 1.9 blower with 42000 miles on it that have been running the 9.5/ 2.5 pulley combo since 120 miles to have it ported and the rotors and bearings are in perfect condition even the coating is still good on the rotors. Its funny also that Wilson Manifold and Fasterprom both say they have done hundreds of 1.9 for CTS-V's and ZL1's and how minimal the wear have been on them if any. This is a great forum it's good that there are many on here that give true honest facts, instead of just typing in assumptions or just wanting to be heard!

[Dega Man]

Originally Posted by 2013 ZL1 #7860

E70, nothing else.

1.34 60 foot so far and over 600 1/4 mile passes. Oil samples every 1K come back pristine...

Still that is very impressive and thanks for sharing.

[Little Walter]

Originally Posted by Dega Man

Yea it is obvious that you think you are MR. EINSTEIN on everything. However we just removed a 1.9 blower with 42000 miles on it that have been running the 9.5/ 2.5 pulley combo since 120 miles to have it ported and the rotors and bearings are in perfect condition even the coating is still good on the rotors. Its funny also that Wilson Manifold and Fasterprom both say they have done hundreds of 1.9 for CTS-V's and ZL1's and how minimal the wear have been on them if any. This is a great forum it's good that there are many on here that give true honest facts, instead of just typing in assumptions or just wanting to be heard!

+1 Amen!

[Can'tHave2MuchHP]

You know, people that build ZL1s that are in it for more than just flat out numbers have posted things before about overdriving the supercharger on these engines. Basically, once you get past a certain point (Which I believe was 2.5 + 9.1 or 8.6) the amount you spin past that gains very little, there's a multiplier of how much HP you gain per gain in Supercharger RPM. This is likely because of many things from efficiency of the blower and removal of timing for temps. If you can eliminate the latter with a few of the following HX/Interchiller/E85/Meth then you can help it gain a lot more. Now the efficiency is still a problem. I know one member who was very good with scientific measurements, tested the car with all different types of pulleys. And basically he came to the same conclusion that Jannetty has told me and us before in threads which is, spinning the blower hard doesn't mean much past a certain point. It's like having that little desk fan and hooking it to the crank pulley of a Chevy small block and running it at 7000 RPM. After a certain point, you can't feel the difference between 4000 RPM or 7000 RPM in that fan. This is the same thing that happens with the small blowers on these cars. Efficiency simply won't allow it to gain much more. Let's say when the car is bone stock, you put a 2.55" upper only on it. You may gain 15+ HP per 1000 supercharger RPM. Then you put on a 8.6" lower, now you pick up an average of 10 HP per 1000 RPM, ok still decent. Now though you put on a 10" lower, now you gain just 5 HP per 1000 RPM.

Now the opposite happens with heat. Remember that last progression? Well, once you push past a certain point and you put a 2.55" and a 9.55"/10", you may only pick up 10 HP vs the 9.1/ 8.6 and 2.55. Say you went from 650 to 660, you picked up 1.5% in HP, but you will pick up a lot more in IAT temps.


See I'm not trying to diss the people/shops that may do this, I'm just SHOWING you the background to what is actually happening. It's not just as simple as pulleying the shit out of your supercharger to hit the HP numbers you want...I have no doubt that with a big cam to release the pressure and Meth/E85/HX upgrade, you COULD justify a 9.55" and 2.55", I just don't think that extra ~10-15 HP is worth it.

[Rando73]

https://www.facebook.com/jokerzperfo...MELINE&fref=nf

800+ blower only.

[ZL1Kid_AL]

Put the pullies on Kill and let it eat.

[STUNNAH]

[2013 ZL1 #7860]

Originally Posted by Can'tHave2MuchHP

You know, people that build ZL1s that are in it for more than just flat out numbers have posted things before about overdriving the supercharger on these engines.

You forgot to mention that you read their posts and now know everything about the LSA...

But haven't actually done any of it to give information based on your own experience...

Yet you try to "educate" the people who have and are sharing that experience for the benefit of others...

Just saying, this site is full of that and it's beyond annoying.

[2013 ZL1 #7860]

Originally Posted by ZL1Kid_AL

Put the pullies on Kill and let it eat.

Amen!

[2013 ZL1 #7860]

Originally Posted by Can'tHave2MuchHP

See I'm not trying to diss the people/shops that may do this, I'm just SHOWING you the background to what is actually happening. It's not just as simple as pulleying the shit out of your supercharger to hit the HP numbers you want...I have no doubt that with a big cam to release the pressure and Meth/E85/HX upgrade, you COULD justify a 9.55" and 2.55", I just don't think that extra ~10-15 HP is worth it.

I have a big cam, E85 and an "HX" making 32 degree coolant. The blower is ported to the max and the it has 2" primaries, no cats and a full 3" exhaust. Yet you don't like the use of my 9.5/2.5 setup?

Only thing I can add is a better head and less compression.
Would you then "justify" the larger pulleys?


Some people talk about stuff and some people actually do it.
Which one are you?