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98 TransAm, Huron Speed, 7875, 679rwhp on 12psi

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Old 08-30-2013, 04:31 PM
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Default 98 TransAm, Huron Speed, 7875, 679rwhp on 12psi

Been working on the car for almost 7 months, through knee and hand surgery. All work except the tune was done by me. Shout out to R.P.M (Garner, NC).

Stock bottom end 2004 LQ4
224r 114LSA
Dual Springs
ARP Head Studs
LS9 Head Gaskets
Huron Speed Truck Kit
Turbonetics 7875 1.15ar
3" electric Cutout
Built 4l60e
Stock 10bolt (Until November)
3.73 Gears
AEM TruBoost
AEM Wideband
Devils Own Meth Kit (On @ 6psi)
80lb Siemens Deka Injectors
BRE7F @ .030










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Old 08-30-2013, 04:36 PM
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Good numbers. I would love to see that kinda power at that boost level
Old 08-30-2013, 05:08 PM
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no boost creep? i basically have 90* wastegates on my twin setup cuz its the only way i could mount them and im worried about boost creep. the hurons kits are 90* too, thats y i ask.
Old 08-30-2013, 05:17 PM
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good **** through the auto! ive been waiting to see more numbers from these turbos. im currently putting together a turbo setup that will be done next month using the same huron kit and the 78/75, but with a .96 a/r. are you on stock heads just with springs? im rocking prc stg 2.5's that were just freshened up, tick turbo cam 230/235 115lsa and its M6 so shooting for 700+ on the same boost level and upwards to 800 with it cranked up using e85.
Old 08-30-2013, 06:18 PM
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It crept up to 14 for a sec then settled back down to 12, but it only did it on 2 runs. Made abouit 720 when it did though

Im running stock heads with prc springs. I have the same PRC stage 2.5 heads but they were milled to 59cc so I didn't want to use them. Will end up selling them
Old 08-30-2013, 06:44 PM
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Yes great numbers through an auto! Glad to see some Huron speed guys posting up
Old 08-30-2013, 09:24 PM
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Those are good numbers. What was the timing set to?
Old 08-31-2013, 12:57 AM
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Nice numbers! I've also been waiting on more results from this turbo.

Is it still building boost past 5250? That plateau in the rpm graph looks funky is why I ask. Converter slip?
Old 08-31-2013, 01:03 PM
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Originally Posted by stoverz28
Nice numbers! I've also been waiting on more results from this turbo.

Is it still building boost past 5250? That plateau in the rpm graph looks funky is why I ask. Converter slip?
Convertor is loose, but it stayed pretty steady if I remember it dropped maybe 1psia and went back up. Found 2 exhaust leaks, one at the manifold and one just before my cutout, so that could have been it.
Old 08-31-2013, 02:02 PM
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That's some good power. I had mine at 13-14 psi and now im wondering what kind of power its making.

My guess was 700whp. It would spin drag radials at 70mph in a 4000lb car.
Old 08-31-2013, 07:22 PM
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running meth on it and no intercooler? I don't see bumper cut out and looks like the lights are in too.. I wanted to do turbo, but can't get past cutting a hole in the bumper on my Bird..
Old 08-31-2013, 07:45 PM
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Im running an intercooler, that's an old pic. Plus I have a Devils Own Meth kit coming on at 6 psi.

This is my bird plate I cut out. Not very good pics but will be posting some after I fix my exhaust leak
Attached Thumbnails 98 TransAm, Huron Speed, 7875, 679rwhp on 12psi-1149042_10200115935409911_600720158_n.jpg   98 TransAm, Huron Speed, 7875, 679rwhp on 12psi-1095108_10200115935049902_2038973231_n.jpg  
Old 08-31-2013, 09:44 PM
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Originally Posted by jrpimp00
Im running an intercooler, that's an old pic. Plus I have a Devils Own Meth kit coming on at 6 psi.

This is my bird plate I cut out. Not very good pics but will be posting some after I fix my exhaust leak
Very nice! Did you diy? What did you use for the screen?
Old 08-31-2013, 10:18 PM
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Originally Posted by svg210
Very nice! Did you diy? What did you use for the screen?
Yes cut it out with a dremel and cleaned up the edges with a 80 grit roll. The mesh is just some Home Depot mesh in a 8' x 2' roll I picked up, its was just $6. Didn't want that big hole up front.
Old 09-01-2013, 11:14 AM
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ok I LIKE THAT! Wish mine was a later model that had the plate like that. mine is a 98 so not sure if they ever had that option or if the whole is the same where I could get a plate and slot the holes in the cover for it to pop in.

Very cool that is what I would want if I did it for sure. The huge square hole by itself is just awful.
Old 09-01-2013, 03:33 PM
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Nice numbers thru an auto! Maybe I missed it but are you running stock heads? Any video?
Old 09-01-2013, 04:51 PM
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Running stock heads, valves, rockers.
Old 09-01-2013, 05:43 PM
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Originally Posted by jrpimp00
Yes cut it out with a dremel and cleaned up the edges with a 80 grit roll. The mesh is just some Home Depot mesh in a 8' x 2' roll I picked up, its was just $6. Didn't want that big hole up front.
Nice! I'll be doing this when I bolt my kit up.
Old 09-01-2013, 07:22 PM
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Nice number!! Makes me wonder what mines making same kit just with a PT 7675. Hits 15psi thru a 6speed and 10bolt.
Old 09-01-2013, 07:51 PM
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Some pics from today. Literally, shes been sprayed off with a hose once in the last 8 months and still looks sexy. Still haven't fixed the exhaust leak, waiting on gaskets.
Attached Thumbnails 98 TransAm, Huron Speed, 7875, 679rwhp on 12psi-d1.jpg   98 TransAm, Huron Speed, 7875, 679rwhp on 12psi-d2.jpg   98 TransAm, Huron Speed, 7875, 679rwhp on 12psi-d3.jpg  


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