On3 7665 vs 7876 for SLB LS1??

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Feb 24, 2015 | 10:01 PM

comatoastWS6

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On3 7665 vs 7876 for SLB LS1??

Huron t4 kit purchased, now am going to be in a financial crunch after that, a 4l80 swap and fuel... SO I need to know what is going to be the best of the "budget" turbos for me to run

Car is a 01 WS6.. Still deciding fuel system, but regardless will run on E85. 4l80 trans, and for the time being... Stock 10 bolt..

So Im just wondering on the turbo for now.. I see alot of ppl saying the on3 7665 is so small of an exhaust side, but am thinking a 7876 might be a little laggy? Just looking for suggestions and input..

Feb 24, 2015 | 10:31 PM

rotary1307cc

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No comparison. The 7665 is a joke of a turbo. That is the old tiny ptrim turbine. The 7876 is much more well suited.

Feb 24, 2015 | 10:48 PM

LT1RAY

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Don't be scared of the 7875, it has a 82/75 turbine wheel and will be perfect for your budget build. He's quick video of a car I tuned using a On3 7875, HS turbo kit, and 91 pump on low boost.

Feb 24, 2015 | 11:37 PM

comatoastWS6

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Thanks guys... It was just one of those things i was debating based off reviews. but the reviews were not on my specific car /mods ( or lack of mods ) .. informative...

So thank you.

Feb 24, 2015 | 11:40 PM

comatoastWS6

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Nice to see it work well in a budget build slb

Feb 25, 2015 | 05:13 AM

95bowtie

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7875 laggy? Not a chance.....that is still a small turbine for a ls. Mine spooled to soon and too hard for the street. Made every gear useless besides 3rd which is 1:1 even on mickeys.

Feb 25, 2015 | 08:46 AM

Ryans99ls1

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7875 wont be laggy at all. Mine lights up too quickly for the street anyway.

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Feb 25, 2015 | 08:38 PM

1969x11

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I couldnt tell a difference between spool up betweem mp70 over the 78/75. Its a beast on the 5.3.

Feb 26, 2015 | 05:04 AM

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95bowtie

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Quote:

Originally Posted by comatoastWS6

Awesome. Thanks guys. You guys both on stock long block? What rpms are you getting into boost, and how much boost are you running?

Sbe and 10-15#

I'd say full boost within a a few sec of going WOT. Can't really go by rpm for me, from a dig tge converter just shoots right up to 3500-4k instantly and very shortly after makes it way to 4500-5k. We are talking maybe 2 sec, by then it is full boost. So essentially like I said before it is almost instant. This is with a 1.15 a/r as well.

I've ran that turbo and whole exact setup with a t56 as well and it was very responsive.

Feb 26, 2015 | 09:25 AM

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Ryans99ls1

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Quote:

Originally Posted by comatoastWS6

Awesome. Thanks guys. You guys both on stock long block? What rpms are you getting into boost, and how much boost are you running?

Mine is full boost around 3500ish on the street, which was about 20lbs. Its always been above 10psi and it spooled the same no matter what level i was at. When it hits, it hits.

I was stock bottom end with 317 heads and a cam i had in the car for years. Rods are bent so its getting built.

Feb 28, 2015 | 02:14 PM

#12

comatoastWS6

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okay this is probably a dumb question, and very minor, but what spark plugs should I be using when I install my huron speed turbo kit with an on3 7876, running e85

Feb 28, 2015 | 08:49 PM

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Mongoose350

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Quote:

Originally Posted by comatoastWS6

okay this is probably a dumb question, and very minor, but what spark plugs should I be using when I install my huron speed turbo kit with an on3 7876, running e85

NGK TR6? There may be better out now, but I think you want a "colder" plug.

Feb 28, 2015 | 11:02 PM

#14

comatoastWS6

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Yea I don't know if I should go one heat range colder or two? In my supercharged grand Prix copper core autolite 104s and 103s seemed to be popular and work well

Mar 1, 2015 | 12:34 AM

#15

Mongoose350

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Quote:

Originally Posted by comatoastWS6

Yea I don't know if I should go one heat range colder or two? In my supercharged grand Prix copper core autolite 104s and 103s seemed to be popular and work well

Oh, I forgot your going e85. That might change things a bit. A hotter plug might be better in that case.