Its back! TT Trans Am
02-15-2008, 10:37 AM
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Its back! TT Trans Am Welp, my baby has been done for a week now, and i'm just finally getting around to putting it on here...
Some might remember that when I got it done last time, on the 1.5 hour drive home something bad happened... most jumped to the conclusion that at 12.0:1 we ran it too lean and it detonated, lifting the head...
Well, fortunately that wasn't the case... When the original builder built the oiling system for the turbos, he didnt use lines that were even close to large enough, and over time, this starved the turbos of oil and made them overheat - this confirmed by Precision themselves.... he refuses to take responsibility for it, so once everything is buttoned up, we'll be taking it to higher authority, but that's all besides the point...
As suggested by many on here, including MM, during the downtime of getting two brand new turbos put on the car, i installed a Snow Performance meth injection kit - only to be used as a safety barrier, not a performance adder...
Quick Specs (if more info is requested, i'll add):
Custom built Twin turbo 348" LS1 with twin 58mm precision journal bearing turbos
this dyno run is on 13.7psi, 12* of timing, and A/F of 11.0:1, spraying 50/50 meth/water.....
***we setup the tune so that if i'm a jackass and forget to fill the meth resevoir, it will not lean out anymore than 11.6-11.7:1
697.56/706.16 rwhp/rwtq
Some might remember that when I got it done last time, on the 1.5 hour drive home something bad happened... most jumped to the conclusion that at 12.0:1 we ran it too lean and it detonated, lifting the head...
Well, fortunately that wasn't the case... When the original builder built the oiling system for the turbos, he didnt use lines that were even close to large enough, and over time, this starved the turbos of oil and made them overheat - this confirmed by Precision themselves.... he refuses to take responsibility for it, so once everything is buttoned up, we'll be taking it to higher authority, but that's all besides the point...
As suggested by many on here, including MM, during the downtime of getting two brand new turbos put on the car, i installed a Snow Performance meth injection kit - only to be used as a safety barrier, not a performance adder...
Quick Specs (if more info is requested, i'll add):
Custom built Twin turbo 348" LS1 with twin 58mm precision journal bearing turbos
this dyno run is on 13.7psi, 12* of timing, and A/F of 11.0:1, spraying 50/50 meth/water.....
***we setup the tune so that if i'm a jackass and forget to fill the meth resevoir, it will not lean out anymore than 11.6-11.7:1
697.56/706.16 rwhp/rwtq
Last edited by SonofaBish; 02-15-2008 at 10:43 AM. Reason: spelling/grammar issues
02-15-2008, 10:42 AM
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Obviously with how rich it is, and how little timing we have in there, there is A LOT of power left in the tune, but i purposely wanted it left very conservative...
I began this build as a budget build, and that didnt work out so well, so i really want this thing to last a long time...
A little bit of tuning is still needed for basic putting aroudn the street (a little rich at times), but other than that, she's ready to hit the street in the spring!!! I've driven it around a bit, and its an awesome car!! The scariest part is that its deceptively fast... the torque builds so linearly, that it just keeps pulling and pulling and pulling, and before you know it, you've just gone from 50-150 in an instant
I began this build as a budget build, and that didnt work out so well, so i really want this thing to last a long time...
A little bit of tuning is still needed for basic putting aroudn the street (a little rich at times), but other than that, she's ready to hit the street in the spring!!! I've driven it around a bit, and its an awesome car!! The scariest part is that its deceptively fast... the torque builds so linearly, that it just keeps pulling and pulling and pulling, and before you know it, you've just gone from 50-150 in an instant
Last edited by SonofaBish; 02-15-2008 at 10:47 AM. Reason: spelling
02-15-2008, 12:30 PM
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Obviously with how rich it is, and how little timing we have in there, there is A LOT of power left in the tune, but i purposely wanted it left very conservative...
I began this build as a budget build, and that didnt work out so well, so i really want this thing to last a long time...
A little bit of tuning is still needed for basic putting aroudn the street (a little rich at times), but other than that, she's ready to hit the street in the spring!!! I've driven it around a bit, and its an awesome car!! The scariest part is that its deceptively fast... the torque builds so linearly, that it just keeps pulling and pulling and pulling, and before you know it, you've just gone from 50-150 in an instant
I began this build as a budget build, and that didnt work out so well, so i really want this thing to last a long time...
A little bit of tuning is still needed for basic putting aroudn the street (a little rich at times), but other than that, she's ready to hit the street in the spring!!! I've driven it around a bit, and its an awesome car!! The scariest part is that its deceptively fast... the torque builds so linearly, that it just keeps pulling and pulling and pulling, and before you know it, you've just gone from 50-150 in an instant
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02-15-2008, 12:34 PM
#8
Yeah, if its rich enough its washing the oil off the cylinder below the oil control rings. Then you are also diluting your oil with gasoline. Its usually a retarded burning your eyes kind of rich, like 79lb/hr injectors on stock fuel map.
02-15-2008, 12:34 PM
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I'm sure that eventually you can, but when i'm talking too rich, i don't mean anything outrageous like that.... I'm talking like when the you are decelerating using engine braking, its putting too much fuel in...
02-15-2008, 12:39 PM
#11
It shouldn't put any fuel in when engine braking. Nice build/numbers btw, looks like an awsome street car.
02-15-2008, 12:48 PM
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good luck on the house!
it got done just in time for the snow! yay!
02-15-2008, 12:55 PM
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So I see, you can purposely run it with a certain amount of reasonable richness all the time to keep the engine safe and help longevity.
