How fast is an EVO 8 with these mods:
on the stock ecu your looking at low 12s MAYBE high 11s if you can really drive. It is going to take at least 25psi to hit a mid 11 in my opinion. On stand alone (aem) I have no clue, because I don't have experience with them. That will soon be remedied in a week or so though 
91 Octane = ~21psi
93 Octane = ~23psi
94 Octane = ~24psi
Note the ~, which means approximately. Some cars can run those values w/out knock, some cannot. If you throw alky injection into the mix, then you can run significantly more boost. These figures apply to pretty much any turbo setup on the Evo ... the limiting factor is not the turbo, it's the octane rating (and the tuning )
l8r)
93 Octane = ~23psi
94 Octane = ~24psi
Note the ~, which means approximately. Some cars can run those values w/out knock, some cannot. If you throw alky injection into the mix, then you can run significantly more boost. These figures apply to pretty much any turbo setup on the Evo ... the limiting factor is not the turbo, it's the octane rating (and the tuning
)l8r)
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Originally Posted by Lancerlover
Stock turbo can handle 22 psi so stick with stock if youre only looking for boost in the low 20s.
Originally Posted by evo_il8
22psi on a gt35 is definetly not the same as 22 psi on the stock turbo
How so? The bigger turbo produces boost easier so it will have cooler air output. This results in slightly more air than the stock turbo at reasonable boost levels (20 and below), but not enough for large gains.
Last edited by fre; Aug 15, 2005 at 10:58 PM.
Originally Posted by fre
How so? At 22psi the same amount of force is being applied to push the air into the engine, the bigger turbo just does it easier and can more easily hold it stable till redline. Trust me tune two cars with identical setups, one with a gt35r and one with a stock turbo and run 22psi in both and then see what they run at the track. I bet the times are almost identical. People keep saying well this turbo flows more air..... Yes it flows more air, but that just means it works less to maintain the same boost level.
The only reason people might see a difference between the two turbos running the same boost at the track is because the stock turbo can't sustain as high of boost as long as the bigger turbo can or the bigger turbo car has a lot more work done, which is usually the case.
What I am saying in short is in a given volume i.e. your intake track and manifold at any given constant pressure you have the same amount of air no matter what. The only way to increase the volume of air in a constant volume is to increase the pressure (density).
The only reason people might see a difference between the two turbos running the same boost at the track is because the stock turbo can't sustain as high of boost as long as the bigger turbo can or the bigger turbo car has a lot more work done, which is usually the case.
What I am saying in short is in a given volume i.e. your intake track and manifold at any given constant pressure you have the same amount of air no matter what. The only way to increase the volume of air in a constant volume is to increase the pressure (density).
Last edited by Knower; Aug 15, 2005 at 06:42 PM.
Originally Posted by tama_mog
On behalf of other math and cs guys out there....please stop fre. Thanks.
I have personal experience on this subject which is why I now convey what I wanted to say in the first place. Sorry I gave you a headache, but it's true. I will make it simple for you. Prove me wrong and I will say no more. Prove that a gt35r makes 50 more hp than a stock turbo at 19psi and I will shut up until then silence, thanks.
Last edited by fre; Aug 15, 2005 at 11:11 PM.
Originally Posted by fre
Simplicity:
I have personal experience on this subject which is why I now convey what I wanted to say in the first place. Sorry I gave you a headache, but it's true. I will make it simple for you. Prove me wrong and I will say no more. Prove that a gt35r makes 50 more hp than a stock turbo at 19psi and I will shut up until then silence, thanks.
I have personal experience on this subject which is why I now convey what I wanted to say in the first place. Sorry I gave you a headache, but it's true. I will make it simple for you. Prove me wrong and I will say no more. Prove that a gt35r makes 50 more hp than a stock turbo at 19psi and I will shut up until then silence, thanks.
To answer the thread starter's question, with all supporting mods to the mods you had listed, you should make ~400whp with an aggressive tune on 91 octane @ 22psi. Quarter mile times have already been answered by people more knowledgeable than I.
Originally Posted by Knower
It's obvious that your strength isn't debate either. Stop twisting things around. Nobody said that a GT35R makes 50 more hp than a stock turbo at ANY given psi. You are a true joke, acting like an expert and then throwing out a completely arbitrary requirement in order for others to "disprove" your halfass theory, along with editing out all your completely wrong statements for "simplicity."
To answer the thread starter's question, with all supporting mods to the mods you had listed, you should make ~400whp with an aggressive tune on 91 octane @ 22psi. Quarter mile times have already been answered by people more knowledgeable than I.
To answer the thread starter's question, with all supporting mods to the mods you had listed, you should make ~400whp with an aggressive tune on 91 octane @ 22psi. Quarter mile times have already been answered by people more knowledgeable than I.
But, but but you forgot temperature... ok, but it is such a small change at boost levels mentioned i.e. 22psi I didn't really think it was significant enough to mention. Was that an arbitrary argument? I was just trying to make it simple for those that couldn't understand what I was trying to say, so I explained it with power differences.
Last edited by fre; Aug 16, 2005 at 07:23 AM.