low end torque and s6 (93) Irons
So i'm building a car right now and my whole build has been directed towards having a nice low end and mid range monster. My question to all of you guys is what is the breaking point of torque on a 93-95 motor. Without extra dowels...just oem studded and doweled motor.. My goal is 400-480 RWHP and as much torque as I can muster up out of her.. All advice would be greatly appreciated! thanks much!
- Ap |
You're all set with the factory design (structurally) for your power level/levels. More importantly when it comes to porting; what turbo will you be using, what boost pressure, and what's the cars purpose...?
I've built a couple motors with tight tolerance cryo-treated rods that do tighten the what I call "housing shifting". Next comes running rods in 5 high stressed points of the engine that go all the way from the rear exterior iron to the front exterior iron. That's much more than you need to know though... |
Forgot to add the other most obvious variable... your chosen tuner! Make sure he can answer the balancing principal where the same power may be made using a lean mixture with less timing or a rich mixture with an increased advance if you choose to sacrifice fuel for a safety margin.
Lean is mean and can also "help" the engine live longer due to less hydrocarbon build up on the rotors. If I were to advise you on the topic I would throw some water-injection on the car and increase the timing with liberal use of fuel :) |
Gtx3582r.... Will be used as a drift and time attack car. I'll be beating on the car pretty hard. I take care of my Cara but I also drive hard. Rotors were race clearanced... I have water/Meth injection. Target boost is 18-22lbs...
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Just get a good tune and keep up with logging and maintenance. Premix should be used to 1oz per gallon and I would try to change the fuel filter ever other oil change.
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But as far as torque......is 450-480rwhp and 450ftlbs achievable and maintainable?
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Nice project, and perfect choice of turbo!
But... (and there's always a but!) there's no way you will make 450 ft-lbs of torque at the wheels with 22 psi boost. Torque is a representation of efficiency and displacement (whether strictly engine displacement or forced induction as well). If you look at a very efficient engine, such as Logan from Defined Auto's N/A semi-pp 20B, which makes 80 ft-lbs of torque per piston-equivalent liter naturally aspirated, and scaled it to a 2-rotor at 22psi (2.5 BAR which is equivalent to roughly 2.5 x the torque), you would get ~450 ft-lbs of torque at the wheels. However, this is an engine without a turbo (restriction), with higher compression, semi-peripheral porting, and that has been designed from intake to exhaust and everything in-between to be efficient. A more realistic comparison is this auto-x FD, designed for great low-end torque: https://www.rx7club.com/single-turbo...d-dyno-956766/ Here, with a small turbo and stockports, they make 350 ft-lbs of torque with 19 psi in a narrow power-band, or ~67.5 ft-lbs of torque per liter N/A equivalent. This engine @ 28 psi would make nearly 450 ft-lbs of torque, if the turbo could handle it. Not trying to be a Debbie downer here, just trying to help you on the right track! :icon_tup: I'm sure you will be happy with the results regardless of the numbers. |
No problem and thanks for the post/info. I'm hoping for anything over 380ft lbs of tq.... I'll let you guys know what happens when its all together
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I don't have any experience with the GTX turbos yet ironically. If you want to pickup low and midrange torque be conservative with your exhaust system. Meaning don't run a straight through system and don't run larger than you need. I'd suggest honestly sticking with 3" for what you seem to be going for.
I wish you lived on the east coast man! LOL, next time I'm out west I'm gonna visit! |
I've got 3” all the way back lance! You coming to seven stock? I'll buy you a brewski or two..
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Where is 7 Stock hosted? I would go but I think it's a little out of my region...
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