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if you havent seen a 91mm T-4 turbo (trick or treat)

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Old 11-05-2009, 04:17 PM
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Originally Posted by MIGHTYMOUSE
the valves were not of the quality necessary. also heard there was some 'issue' with the guides used in my assembly.

Some of my intake valves ended up like upside down umbrellas....


Although I did blow the crap out of my engine at that time too...so I guess the cylinder temps were rather high

Seat pressure combined with extreme cylinder temps I guess can only do one thing. Perhaps if its a material issue that cant be helped, ceramic coating the face of the intake valve may help stop heat transfer into the valve ?
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Old 11-05-2009, 04:39 PM
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from what i understand from bob at all pro, i am now being switched to the correct intake valve for the application. i have some idea that will help.
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Old 11-05-2009, 05:26 PM
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^ Inconel or a standard SS?
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Old 11-05-2009, 05:33 PM
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you got me man, i leave it up to the pro's.

live by the sword, die by the sword
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Old 11-06-2009, 08:41 AM
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Originally Posted by 95lsxss
When is that? im new to turbo v8s, i used to be a honda boy, now ima CHEVY MAN! lol
3800-4000rpms. It made 1123rwhp. Mightymouse is trying his GT91 T4 on a auto so we'll see how that does. We want to get some #'s from the guys pushing these things to the max.
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Old 11-06-2009, 03:26 PM
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Originally Posted by MIGHTYMOUSE
i think i would like a housing sent to me machined down to a 4" inlet instead of machined up and out to a 5" inlet.
do i need to call about this? seems totally reasonable.
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Old 11-06-2009, 08:09 PM
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Originally Posted by DrTurbo
3800-4000rpms. It made 1123rwhp. Mightymouse is trying his GT91 T4 on a auto so we'll see how that does. We want to get some #'s from the guys pushing these things to the max.
this is on a 370CI engine? i wonder how this thing would be on a 6 speed with 9.6:1 compression.
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Old 11-07-2009, 08:53 AM
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where can i buy this turbo? forced induc? $$$???
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Old 11-07-2009, 11:06 AM
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Originally Posted by dreamls1
where can i buy this turbo? forced induc? $$$???
Post #36

Originally Posted by DrTurbo
$699 upgrade, or $1599 for a new complete unit.
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Old 11-16-2009, 05:01 PM
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figures I just spent 1500 on a new PT88...hey Jose will you do a trade in + some cash? Its kinda crazy to send in a brand new never used turb to upgrade and spend 700$ when its really only 100$ more expensive than a new one.
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Old 11-19-2009, 07:03 AM
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i have been looking at making my 408lsx a 427lsx. would this 91mm t4 be the trick? i have a 88mm mid-fra. now and i am looing at making 1000rwhp, but i have been told that it cant be done with the 88mm???? it made 821 at 18psi on stock 317s, and i just got some new trickflow 235, do you think i can make 1000rwhp on the 408 with the 88mm? or go the the 91. orrr. do i have to go to a t-6?

BTW- its in a 5700lbs denali
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Old 11-19-2009, 06:07 PM
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the 88 can make 1000rwhp...question is can the heads hold that in the cylinders
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Old 11-19-2009, 06:09 PM
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Old 11-19-2009, 06:28 PM
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I was told by Jose that it maxxed out around 850....so now my brand new pt88 is up for sale lol
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Old 11-19-2009, 06:41 PM
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im confused....isnt this the same turbo Mightymouse went 8.7s on at 3879ish raceweight?
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Old 11-19-2009, 07:10 PM
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Originally Posted by 05crew
i have been looking at making my 408lsx a 427lsx. would this 91mm t4 be the trick? i have a 88mm mid-fra. now and i am looing at making 1000rwhp, but i have been told that it cant be done with the 88mm???? it made 821 at 18psi on stock 317s, and i just got some new trickflow 235, do you think i can make 1000rwhp on the 408 with the 88mm? or go the the 91. orrr. do i have to go to a t-6?

BTW- its in a 5700lbs denali
look into Parish's setup. He dyno'd 1011rwhp and 1070rwtq with a 8.8cr 408 with 317s and a PT88. using a 230/236 cam. its been done and can be done again
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Old 11-20-2009, 10:44 AM
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...didn't know that. I wonder why I would be told differently. So my goals of 1000whp arent ridiculous with this turbo then....
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Old 11-20-2009, 12:03 PM
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Originally Posted by Snyper
...didn't know that. I wonder why I would be told differently. So my goals of 1000whp arent ridiculous with this turbo then....
It can be done. 1012rwhp we did with a customers LT1. Problem is the turbo is done and doesn't hold up as you start to over spin that unit at that point. Also that was on a 355. As the motor ci's go up the power will go down and back pressure will go through the roof.
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Old 11-20-2009, 12:04 PM
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Originally Posted by cablebandit
im confused....isnt this the same turbo Mightymouse went 8.7s on at 3879ish raceweight?

Yeah but I don't think he's made over 900rwhp yet. Maybe he can chime in.
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Old 11-20-2009, 12:37 PM
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So this will be decent on a lq9? untill i go built...?
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