450+whp Evos on pump (93) chime in!

Reply Subscribe

Thread Tools

Search this Thread

Sep 21, 2012, 03:33 PM

#61

steven121

Evolved Member

iTrader: (27)

Join Date: Oct 2009

Location: TX

Posts: 2,786

Likes: 2

Received 9 Likes on 7 Posts

Never mind found my answer it was on the 500hp stock block club. All they needed was cams and head studs which I already have. Just need to port my manifold, port the intake, bigger turbo, and a tune.

Reply Like

Sep 21, 2012, 04:08 PM

#62

JohnBradley

Evolved Member

iTrader: (30)

Join Date: Jan 2004

Location: Northwest

Posts: 11,399

Likes: 37

Received 70 Likes on 52 Posts

Quote:

Originally Posted by EvocentriK

Thanks Aaron, can you please pm me your equations I'm getting wildly different numbers to you. If I compare my data in pressure using pascals as units to your pressure in psi it's close but after conversion its very different. I'm calculating Pmep though... would like to see what youre doing for iMEP.

I am using a dyno sim software package to get the numbers.

IMEP, FMEP, and BMEP will all vary. Honestly I am not sure what PMEP is? But anyway its more for comparison between given levels vs rpm anyway

Reply Like

Sep 21, 2012, 05:54 PM

#63

rEVOlution04

Evolving Member

Thread Starter

iTrader: (16)

Join Date: Apr 2008

Location: Rochester, NH

Posts: 212

Likes: 0

Received 0 Likes on 0 Posts

Quote:

Originally Posted by CBRD

Aaron-

the 33R on our car made 532whp on 93 at around 27psi- the 35RB made 587whp at about the same psi-

We have made 425whp at 22psi on a stock block motor with the 33RB- also- stock cams-

just for reference.

CB

Thanks for the input Chad! I should be right around my goal of 500whp (dynojet) at 25-27psi. The HTA3586R is too big for my goals on a daily driver, especially since my car will pretty much always see just 93... Hence why I'm going with the 33RB turbo. One cause not many people have it and two it spools close to a 30R, but still has the top end of a 35R. It should be perfect for my set up and goals.

Reply Like

Sep 24, 2012, 05:16 PM

#64

rEVOlution04

Evolving Member

Thread Starter

iTrader: (16)

Join Date: Apr 2008

Location: Rochester, NH

Posts: 212

Likes: 0

Received 0 Likes on 0 Posts

Quote:

Originally Posted by JohnBradley

Hot air is hot air. Running 28-29psi the thermal load on the intercooler is increased, backpressure in the turbine housing is increased, EGT manages to stay fairly constant but is higher. However the first 2 are the primary causes of detonation and the 3rd doesnt help, so making good power with the boost lower is always better.

More torque early is harder on things. For a given torque value (lessay 500 ft lbs) the difference between making it at 4000 rpm and 6000rpm is 200psi IMEP or so. I have done the math but dont have it in front of me right now but I know its somewhere around there.

The whole reason I posted our theory of "400 ft lbs" breaks rods 3 or 4 years ago was mostly based on torque at low rpm, not 400 ft lbs at 5500 or something like you'd see on a bigger turbo. Thats why these stock block cars can make 700whp because the torque is at 6100-6500 and keeps the mechanical load (cylinder pressure) low enough that the IMEP might be close to what it is at 400 ft lbs at 3400.

I will do some math and see what I come up with specifically.

Aaron

Aaron,

I really appreciate the input. I've only been around Evos 2 years or so and its really cool to learn more about IMEP and EGT and etc.. Aside from making the power I want, I'm sure you can tell me goal is to keep those as much on the safe side as possible. Such as run less boost and have less torque way down low.

Reply Like