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ls1 s/s notch on 28s
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Discussion Starter #1
what is the difference between these..i see the gt-88 is 1249$ new and the gt47-88(gt4718) is 1695$ new but both are rated for 1400hp.

also what is the borg warner peice that is now a 88mm or converted to an 88mm.i thought i seen its rated for 1500hp? is it a large frame or a med frame??
 

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The BW can be had in all sorts of combos. The s400 series most commonly used is a large frame that can be had in T6 or T4 hot sides. Most common 88 would be the S400 T6 with a 96mm turbine and 1.32 hotside. IMO It makes a shit load of power and I think can be had for the $1200 range. Before I bought anything I would look into the BW and check pricing.
 

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ls1 s/s notch on 28s
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Discussion Starter #3
yeah i just been looking at pricing for the 88s.. and 80s and what there out puts are..but if the s480 is a large frame then its out..unless something is done..

i see theres a race cover option to the reg gt4788 and raises it from 1400hp to 1600..im wondering if that cover could be done to the gt-88 one..then for maybe 1400 or 1500$ you got a mean mother fucker
 

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The GT88 is a mid-frame unit with the 47-88 compressor wheel. Its T6 based but a good deal smaller then the GT47 physically. Also the S400 we build for many companies in a 88mm flavor with the HP 88 comp wheel. Makes big power and its a little larger then the GT88, but smaller then the GT47.
 

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ls1 s/s notch on 28s
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Discussion Starter #5
^thanks that clears alot up...is the gt88 able to make the same power as the gt4788 though? is there any down fall to it? can it be up graded to a gt47 later on? Also can it get a race cover if its not up graded and still just a gt88..

With it being smaller helps some seeing i got a 4th gen and am limited on how i can mount it.
 

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i see theres a race cover option to the reg gt4788 and raises it from 1400hp to 1600..

Where did u find this ?
 

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i see theres a race cover option to the reg gt4788 and raises it from 1400hp to 1600..

Where did u find this ?
Their is a larger A/R cover with standard inlet bell and no the re-flow style cover available. The "real" gains we have seen have only been about 75hp max on a setup that wasn't already choked up on the turbine side. The GT47's typically chokes on the turbine side well before the compressor side becomes an issue.
 

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^thanks that clears alot up...is the gt88 able to make the same power as the gt4788 though? is there any down fall to it? can it be up graded to a gt47 later on? Also can it get a race cover if its not up graded and still just a gt88..

With it being smaller helps some seeing i got a 4th gen and am limited on how i can mount it.
The GT88 will make close but the smaller cover does limit some higher PR flow.
 

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Is this larger cover visibly and externally larger than the typical GT47? Also what CI do you think the choking problems come in?400 ci and over or less? Thanks
 

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I have been using quit a bit of the 8847 with a T4 frame, they support 1400hp and are slightly bigger than a Precision 76.
 

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Is this larger cover visibly and externally larger than the typical GT47? Also what CI do you think the choking problems come in?400 ci and over or less? Thanks
What we have seen from many customers logs....370-400ci engines really start to see highly elevated PR's on the exhaust side. That is the reason for the GT50....cures the backpressure problem without having to make the big jump to the GT55 turbine. As for the cover, yes its essentially thumper sized comp cover.
 

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ls1 s/s notch on 28s
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Discussion Starter #13
The GT88 will make close but the smaller cover does limit some higher PR flow.
could i get the race cover? though for the gt88 and how much with it? my motor aint built yet so i could go 383ci,355ci or smaller or ill be doing a 370ci lsx..

i was just going to get a gt47-88 used and get it refreshed but then that would put me up where the gt88 depending on how much the cover mod is..

it will be in a 4th gen so i am limited to space up there unless i stick it in the noise and run a split rad or one angled side ways
 

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i had the gt88 and it worked good than i went to the gt47-88 and never looked back i have the 3.5 exh wheel with a .96 a/r hot and .69a/r top cover works great on my 355 sbc and my new 383
 

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ls1 s/s notch on 28s
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Discussion Starter #16
What is the baddest high horsepower 88mm turbo available?
true mid frame is the 88mm pro mod rated for 1550hp,then from the sounds is the gt4788 with race cover at 1475..then on a large frame is the 98/88mm rated for 1700hp and then there is the nmra legal 98/88 that measures 88mm tip to tip and that is rated for 1500hp.

then you also have the new borg warner s400 88mm rated for 1500hp..
 

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ls1 s/s notch on 28s
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Discussion Starter #17
i had the gt88 and it worked good than i went to the gt47-88 and never looked back i have the 3.5 exh wheel with a .96 a/r hot and .69a/r top cover works great on my 355 sbc and my new 383
what was your e.t diff from swapping between the 2 and was it at the same boost level?
 

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Fastest mustang roller
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what was your e.t diff from swapping between the 2 and was it at the same boost level?
I would also like to know, but it seems like the gt88 is a good budget alternative to the 47-88.
 

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ls1 s/s notch on 28s
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Discussion Starter #20
^ i agree im just wondering if the race cover could be done to it seeing it seems like it dont make as much power as the gt4788 so im thinking with the race cover it would get it back in that range.but i also dont know the price of the race cover so that alone could make it the same cost of a new gt4788..
 
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