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370, Garrett GT55-94, truck manifolds build thread. ***UPDATE 12-10***

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Old 09-24-2011, 12:07 PM
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Your convertor must bekilling because I trap 114 on cool nights with my 550whp. I know for certain its taking 4mph atleast off your trap speed..

What kind of tires do you have on the rear? Also your car launches great, what's your rear susension?
Old 09-24-2011, 02:50 PM
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Yea I can trap 110 in my 3950 pound pig at 580-600rwhp you should be getting 117 at least.
Old 09-24-2011, 08:20 PM
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Originally Posted by BLINGOLE
Your convertor must bekilling because I trap 114 on cool nights with my 550whp. I know for certain its taking 4mph atleast off your trap speed..

What kind of tires do you have on the rear? Also your car launches great, what's your rear susension?
I cant tell if the slip is consistent or not. If i run around 7-8 psi it wont slip. Tires are hoosier 325s DRs and rear suspension is rod ended everything, spohn drag bar, spohn torque arm.
Old 09-24-2011, 09:05 PM
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There are calculators to calculate slip. When I calculated mine it was like -.1%, gotta love them FTI converters.

Who spec'd the converter? Was it spec'd for you specific application i.e. 15-20+ psi of boost and the rpm's your going to be turning at that power and race weight?
Old 09-24-2011, 10:34 PM
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Nice shake down passes!!
Old 09-24-2011, 11:54 PM
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what were your iat's?
Old 09-25-2011, 05:09 AM
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sounds great
Old 09-25-2011, 08:24 AM
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what kind of rpm drop do you get between shifts?
Old 09-25-2011, 10:05 AM
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Sounds like it took awhile to spool up, do you have a 2-step/trans brake?
Old 09-25-2011, 12:24 PM
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Originally Posted by Fbodyjunkie06
There are calculators to calculate slip. When I calculated mine it was like -.1%, gotta love them FTI converters.

?

i hope to god you are talking with the converter locked if you are figuring .1% slip...
Old 09-25-2011, 12:58 PM
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Originally Posted by Fbodyjunkie06
There are calculators to calculate slip. When I calculated mine it was like -.1%, gotta love them FTI converters.

Who spec'd the converter? Was it spec'd for you specific application i.e. 15-20+ psi of boost and the rpm's your going to be turning at that power and race weight?
Converter cam with the powerglide and i was expecting this. Both are from Trans King, and i bought them used.

Originally Posted by dudeman
what were your iat's?
Iat temps were about 95-105 when i checked. Not sure what they were on the line.


Originally Posted by dudeman
what kind of rpm drop do you get between shifts?
Depends on the boost obviously, but when i had it up on the second video it had very little, maybe 500 RPM drop if that. It felt like one gear the whole way down. In that second video i bounced off the limiter(6000) crossing the line.

On lower boost levels it has a more noticable drop but im not sure exactly how much.

Originally Posted by Sluggish
Sounds like it took awhile to spool up, do you have a 2-step/trans brake?
I do but have not used them this year yet. I will be trying it out next weekend.
Old 09-25-2011, 01:06 PM
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Hey do you stock rear shocks ?


Originally Posted by Fbodyjunkie06
There are calculators to calculate slip. When I calculated mine it was like -.1%, gotta love them FTI converters.

Who spec'd the converter? Was it spec'd for you specific application i.e. 15-20+ psi of boost and the rpm's your going to be turning at that power and race weight?
Tci's website has some good calcualtors. Which mine is 28% if I remember right.
Old 09-25-2011, 01:11 PM
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Originally Posted by rotary1307cc
i hope to god you are talking with the converter locked if you are figuring .1% slip...
Ehh, probably not, I used the wallace racing calculator, and entered rpm going through traps, mph, rear gear and tire circumference....?

It was -.1

Edit: I was using my 1/8 mile rpm and mph and that gave me the -.1% I put in my one 1/4 mile pass I've made and got 4%.

From what I have read 4% is pretty good.
Old 09-25-2011, 01:47 PM
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4% is nice and tight on the topend

.1% unlocked is crazy

I see just over 6% through the traps with my PTC, but last year I saw 25+% with a cheap summit converter

Whole new car with the converter change
Old 09-25-2011, 02:02 PM
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Originally Posted by rotary1307cc
4% is nice and tight on the topend

.1% unlocked is crazy

I see just over 6% through the traps with my PTC, but last year I saw 25+% with a cheap summit converter

Whole new car with the converter change
I figured if I entered in mph, rpm, tire circum., and gear ratio it'd be the same no matter 1/8 or 1/4, I also calculated that with my 25.8" 275/50's which I've never ran in the 1/4. I just re-calculated it with the tires I actually used in that 1/4 mile run and got 5%.
Old 09-25-2011, 02:23 PM
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Originally Posted by BlackWS666
I do but have not used them this year yet. I will be trying it out next weekend.
^^^this i like
Old 09-25-2011, 05:48 PM
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I just did the slippage calculator and it came up with 22.401%
Old 09-26-2011, 06:21 PM
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What's with all the calculator crap. You can monitor converter slip directly by rpm with hpt. My current FTI 2800 slips about 500 rpm up top and my old FTI 3200 slipped almost 1000.

Last edited by ericwilloughby; 09-27-2011 at 03:47 AM.
Old 09-26-2011, 06:52 PM
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Amazing! Amazing car, amazing build!
Old 09-26-2011, 09:47 PM
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Originally Posted by LSCustoms
Amazing! Amazing car, amazing build!
Thanks dude.


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