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USP Motorsports 996TT: Engine build thread

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  #31  
Old 05-11-2011, 01:25 PM
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Originally Posted by needforspeed502
Im surprised that 4 of the rods were bent. How bent were they?
i bent 5 ouf of 6 rods when i rebuilt mine
 
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  #32  
Old 05-11-2011, 04:56 PM
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Originally Posted by OS Inspector
im not have you seen what a stock 996tt rod is? its the same as the NA 993 rod


this has been happening over and over just no one has been talking about it.
 
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  #33  
Old 05-11-2011, 05:00 PM
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Originally Posted by landjet
Chris, you mentioned raising the rev limiter to 7500rpm. When doing an engine build, how do you determine what is a safe rpm number for redline? What factors play into this determination? I know a number of tuners raise the rev limiter on stock cars when you buy their flash. Is that safe?

1 rod angle. 2 rods and rod bolts 3 weight of valve train. I run 8000 rpm redline but shift as soon as my torque peak is ideal for the next gear
 
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  #34  
Old 05-11-2011, 05:02 PM
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Originally Posted by Chris Green@USP
Pistons and sleeves looked good wen they came out, and 4 out of 6 rods seemed to have started bending. I'll be keeping the stock oil pump and head studs. Raising the compression would be nice, but I wanted to keep this build pretty basic.. its usually the basic setups that end up doing the best . Thanks for the compliment on the head work, I'm really happy with the guys work as well. Yes, I changed to single groove keepers.

Happy Wednesday gentlemen!
You are so right with the basic thing.
 
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  #35  
Old 05-11-2011, 10:05 PM
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What about going from a dual mass flywheel to a LWFW, does that allow for safe higher rpm limits?
 
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  #36  
Old 05-13-2011, 06:21 PM
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  #37  
Old 05-13-2011, 08:32 PM
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Originally Posted by landjet
What about going from a dual mass flywheel to a LWFW, does that allow for safe higher rpm limits?
Makes no difference. It is piston speed. the sharper the rod angle the fast the piston accelerates in the bore. At a given speed the piston material will hit its pasty temp and stick to the sleeve. That right there is game end. No oil can save you.
 
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  #38  
Old 05-14-2011, 11:30 AM
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Sorry, I'm not clear on what you mean. What is "pasty" temp? Also, if it depends on piston speed, wouldn't a LWFW allow for quicker piston speed?
 
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  #39  
Old 05-14-2011, 05:02 PM
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Originally Posted by Chris Green@USP
Pistons and sleeves looked good wen they came out, and 4 out of 6 rods seemed to have started bending. I'll be keeping the stock oil pump and head studs. Raising the compression would be nice, but I wanted to keep this build pretty basic.. its usually the basic setups that end up doing the best . Thanks for the compliment on the head work, I'm really happy with the guys work as well. Yes, I changed to single groove keepers.

Happy Wednesday gentlemen!
keep up the good work Chris...I just ordered a strut bar from you guys...I'm doin my part to help on constributing to your build !!!
 
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  #40  
Old 05-16-2011, 08:01 AM
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Originally Posted by P2P
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P2P i have a similar set up as you do,K24/18G'S Fabspeed 1' generation 200 cel cats,DV but i still am in AWD.My question is have you ever dyno your car ? .Here in El Salvador there is only one place to DYNO and is not veru thruthfull that's why i haven't done it.

Your WHP would be similar to mine,not exactly because you have RWD and another variables.

Rolando
 
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  #41  
Old 05-16-2011, 08:50 AM
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Looks like fun Chris, did Bill do that headwork ?
 
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  #42  
Old 05-16-2011, 09:05 AM
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Actually i'm running stock injectors and my car is running lean. 1bar on Pump gas and RWD 470 hp. BTW my exhaust is catless.
 
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  #43  
Old 05-16-2011, 09:45 AM
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Originally Posted by P2P
Actually i'm running stock injectors and my car is running lean. 1bar on Pump gas and RWD 470 hp. BTW my exhaust is catless.
I run 1.1 bar also from protomotive by Markski but i use a mixture 50/50 of 94 pump and 104 race leaded gas that's around 99 octane.I also have 5.0 FPR,stock injectors.

Thanks for your info man.
 
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  #44  
Old 05-16-2011, 10:06 AM
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Originally Posted by rdss
I run 1.1 bar also from protomotive by Markski but i use a mixture 50/50 of 94 pump and 104 race leaded gas that's around 99 octane.I also have 5.0 FPR,stock injectors.

Thanks for your info man.
1.1 bar u may run out of ur injectors duty cycle and the motor will lean I think.
Watch out
 
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  #45  
Old 05-16-2011, 10:31 AM
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Originally Posted by P2P
1.1 bar u may run out of ur injectors duty cycle and the motor will lean I think.
Watch out

I understand that the 5 FPR does it.I hope they are right.
 
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