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Boost on a budget with NA Cam

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Old Dec 30, 2017 | 09:57 AM
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Default Boost on a budget with NA Cam

I know this cam isn't optimal for a turbo setup but i'm just trying to get the setup going for the spring and upgrade as budget and time allows...

Current setup:

LQ9 untouched stock bottom end
GMPP LS3 CNC heads and ebay studs
LS9 gaskets
FAST 102 intake and TB
80lb injectors

Turbo kit is the fox body On3 with a 78/75 turbo

Plan on running straight pump gas 10-12lbs to keep it alive for now
Meth probably down the road is an option

This is my NA cam which was billed as max effort pump gas on motor. It made great power but not sure if I can get away with what i'm doing with it now.

.637 .637
duration .006 296 316
open @.050 Int: 11 close BTDC 45
Exh: 65 close BBDC 11
107 centerline
duration @ .050 237 257
Lobe Lift .3750 .3750
Lobe separation 112


Not trying to go crazy with it. 600-650 wheel is the current goal to have a fun little street car.

Do you think I can get away with it?
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Old Dec 30, 2017 | 10:03 AM
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This guy from lsx specialties had some pretty good results with an N/A cam and a cast wheel s475 and like 6psi he trapped 140mph


its the flat black nova a couple posts down if you scroll

https://www.facebook.com/LSXspecialties/
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Old Dec 30, 2017 | 12:19 PM
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hmm lots of overlap and a fairly high backpressure turbo

well i'm in for your result
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Old Dec 30, 2017 | 12:48 PM
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it will run like ****
put a smaller cam in it, or get a second 78/75.
The turbine is too small for a single turbo, aggressive cam/engine combo
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Old Dec 30, 2017 | 01:07 PM
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Way too much camshaft for way to small of a turbine.

Any of the 1.32 A/R T6 borg warners will let you get away with some boost.
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Old Dec 30, 2017 | 04:28 PM
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UGH, I figured I was gonna end up having to swap the cam.
Can't go too much bigger on the turbo due to the On3 kit having it close to the hood, thin they have an 80mm that will fit but thats T4 as well.

I guess a sloppy stage 2 or BTR 2 turbo cam will get ordered next then....
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Old Dec 30, 2017 | 05:49 PM
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If you have or can find a stock cam cheap I think it would work ok. I think with that turbo setup you will want little to no overlap.

Justvan idea to get it up and running on a budget.
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Old Dec 30, 2017 | 07:44 PM
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Originally Posted by LSFOX
UGH, I figured I was gonna end up having to swap the cam.
Can't go too much bigger on the turbo due to the On3 kit having it close to the hood, thin they have an 80mm that will fit but thats T4 as well.

I guess a sloppy stage 2 or BTR 2 turbo cam will get ordered next then....
The sloppy stage 2 from jegs is a bit more the elgin engines is like $30-40 cheaper same specs

https://www.ebay.com/itm/Elgin-Engin...19.m1438.l2649

Why dont you just save $ and build your own kit and order a bigger t6 housing turbo?
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Old Dec 31, 2017 | 10:57 AM
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I have run a non-intercooled, turbo Square port head'd 6.0 for the last few years. My cam was this: Comp Cams 227/235@.050, .614"/.624", 114lsa+4.
It layed down 1001RWHP at 29psi, 800rwhp at 16psi, somewhere just over 600rwhp at about 7psi, I didnt pay much attention to those 7psi numbers.
peak hp was at 6700rpm
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Old Dec 31, 2017 | 12:01 PM
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Originally Posted by adamantium
The sloppy stage 2 from jegs is a bit more the elgin engines is like $30-40 cheaper same specs

https://www.ebay.com/itm/Elgin-Engin...19.m1438.l2649

Why dont you just save $ and build your own kit and order a bigger t6 housing turbo?
I don't have the tools or capabilities to build a bigger kit for the car hence why im messing with the On3 kit. Nor the money to pay tohave one done.
Driveway built car

My HP goals are low and since the car will be driven on the street more than the track i'm not gonna push it full tilt.



3Pedals
I followed your build for a while when i was NA looking to go turbo, always liked that car


I currently have a Fast 102 and 102 TB. I'm debating just selling them for a stock LS3 and a 92mm and using that extra $$ to get a new cam.
Since its been proven to be very minimal difference between stock intake and FAST
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Old Dec 31, 2017 | 12:12 PM
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if $$ is the biggest hold up, scour the classifieds for a used smaller cam. ANYTHING with a wider LSA, like 114 or wider, and around 228@ .050, and under will work very well.
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Old Dec 31, 2017 | 01:02 PM
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Originally Posted by LSFOX
I guess a sloppy stage 2 or BTR 2 turbo cam will get ordered next then....
Those are still two really bad cam choices for a 7875.
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Old Dec 31, 2017 | 01:05 PM
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i'd probably go with the elgin 1839 which has -2* overlap


the 1840 has +5* overlap


if you do the 1840, you might try retarding the cam a bit to try and help with back pressure issues.

FWIW I ran a cam very similar to the elgin 1838 last year in a 4.8 with the 7875 and it was a monster. first outing at 10.99 at 133---19 psi, 3800lb pick up truck---but it hurt the motor.

also it looks like VS racing has some new T4 framed turbos with bigger turbine wheels and housings, but there is pretty much zero data on results and they are on the expensive/just-buy-a-borg side of the price index


anyways i know whats it's like to try and hustle on budget. glad you came to the dark side and are going boosted. sell all that baloney NA stuff like intake and ported throttle body and throw some truck parts at that sucker
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Old Dec 31, 2017 | 01:14 PM
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Originally Posted by JoeNova
Those are still two really bad cam choices for a 7875.
Thats an awfully bold comment
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Old Dec 31, 2017 | 01:22 PM
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Originally Posted by 01ssreda4
Thats an awfully bold comment
The only bold thing is when people think those 2 cam choices work for every engine, every RPM, every turbo, every goal, every fuel, every boost level, every hotside... I can keep going. They don't know why they work, but they worked great that one time on that one setup so now they work for everything.
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Old Dec 31, 2017 | 02:56 PM
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Originally Posted by JoeNova
Those are still two really bad cam choices for a 7875.
What do you reccomend then?
What is your opnion on what I should be looking for?




Also i was part of the Boosted dark side before.
302 with a Master Power 70mm and a blowthrui carb
357W with a Comp triple BB 80mm and a blow thru
Went LS and did NA then nittrous because it was cheap but have always been going back to turbo, just needed time
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Old Dec 31, 2017 | 09:09 PM
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Originally Posted by LSFOX
I don't have the tools or capabilities to build a bigger kit for the car hence why im messing with the On3 kit. Nor the money to pay tohave one done.
Driveway built car
Got the on3 kit for free? ive heard about them not being so great. A member on sloppy mechanics bought 2 for his truck and said they're kits are alright and one of the two kits boost creeped like crazy. All those China kits will need some adjusting and DIY. If you're on a budget i just don't understand how the on3 is a "budget" minded option.






Join sloppymechanics page on FB if you're on a really really tight budget and sell the on3 stuff with that turbo. Buy a $200 GT45 and build your own turbo kit, you should be way less into it then.
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Old Dec 31, 2017 | 10:26 PM
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Boost will add to your combo. The fact that you ae already OK with a rowdy bit of NA excitement in your current combo means that you should LOVE boost All of the previous posts seem to be about whether your current build is ideal for FI. It is not. That is because a proper boost build will make enough HP to destroy your block with a smooth idle.
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Old Jan 1, 2018 | 12:01 AM
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swap the cam and put the gate on the turbine housing if it's not after/at/damn close to the merge. 600 wheel on pump + meth should attainable if the tune is dialed. HMU if you need fab work to get the gate on the housing, i've done it for a couple forum guys with good results.

my new hastily put together set up for next season is almost exactly that minus the squareport heads. currently trying to figure out a boost control strategy...the 7875 spools so hard and fast on a 364 it blows drag radials loose at freeway speeds.
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Old Jan 1, 2018 | 09:02 AM
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I ran a BG kit on my foxbody's with even worse wastegate placement. it was T-d off the crossover. Held 12lbs fine. I always knew there have been issues with the On3 with creep but I can get another gate and have that added to the DS of the car, theres a good amount of room in the crossover. It wouldnt be much to get an extra 44mm gate added

I paid $2000 for the complete kit on the CC.
To get the kid fabbed locally i'd probably be in the 2K range just for time and materials, not including turbo wg bov ect.

I've done well with a budget setup before.
Just was concerned about the cam choice


I've been on sloppy mechanics for years. But i lack a garage and the tools to do some of the work they do, so I was giving this kit a shot to see just how well i can get it to work.

Originally Posted by adamantium
Got the on3 kit for free? ive heard about them not being so great. A member on sloppy mechanics bought 2 for his truck and said they're kits are alright and one of the two kits boost creeped like crazy. All those China kits will need some adjusting and DIY. If you're on a budget i just don't understand how the on3 is a "budget" minded option.
https://www.youtube.com/watch?v=YpLMcyyx8Tg






Join sloppymechanics page on FB if you're on a really really tight budget and sell the on3 stuff with that turbo. Buy a $200 GT45 and build your own turbo kit, you should be way less into it then.
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