Turbo Help

Anti_Hero0932 · Nov 6, 2018

Hey guys. im getting ready to put my small block together. its pretty well stock besides a small cam. ported iron heads and gt40 intake. has head studs and a main girdle. what size turbo are you guys running on this size engine? i dont want to use the on3 70mm to awful bad. thinking about ordering something from VS racing just didnt know what size.

car will have 60lb injetors and a 340lph pump.

Thanks!

a91what · Nov 6, 2018

Thats more pump than you will need. GSS255LPH walboro pump is what you want.

@hoopty5.0 @90sickfox for the on3 turbo advice

hoopty5.0 · Nov 6, 2018

I have a VS racing 7875 with the billet wheel. Nice piece.

Anti_Hero0932 · Nov 6, 2018

would it hurt to have the 340 tho? i mean incase i want to go bigger later?

with the 7875 be to big? does it spool down low very well?

a91what · Nov 6, 2018

you can go bigger on the pump but the fuel will get hot. some think this is a moot point. your stock block and internals will give up before you run out of pump. around 12psi is about as far as you want to push it.

Anti_Hero0932 · Nov 6, 2018

rodger that. they arent real expensive ill just get the 255. i just want to make like 420ish horse power and do hood rat things with my friends. wont be a drag car just a driver to have some fun in.

FoxMustangLvr · Nov 6, 2018

I'm no turbo expert but from what I've seen you don't want bigger than 70mm for your setup. Any bigger and you'll lag big time. If I'm reading your combo correctly, you have a 302 engine, ported E7 heads, and an explorer intake, right?

90sickfox · Nov 6, 2018

I have the on3 turbo 8in my car. No issues with it. O did have to buy a oil restrictor for it. My oil pressure starts off at about 90psi.

FoxMustangLvr · Nov 6, 2018

90sickfox said:
I have the on3 turbo 8in my car. No issues with it. O did have to buy a oil restrictor for it. My oil pressure starts off at about 90psi.

What size turbo do you think this guy should run? He's wanting help with that.

Anti_Hero0932 · Nov 6, 2018

yes sir pretty well factory besides e cam gt 40 intake. hogged out e7's and the usual little things like 75mm tb and egr delete.

most my friends have cammed ls cars i think it would be pretty funny to go out with a stock headed fox and hurt some feelings. i just sold a cammed z28 that made 368 rwhp and it was pretty fun. this fox is lighter and has the potential for more horse and a lot more tq

Anti_Hero0932 · Nov 6, 2018

heres a pic of the car.

i had an 86 lx car before this and a 91 coupe as well.

Anti_Hero0932 · Nov 6, 2018

90sickfox said:
I have the on3 turbo 8in my car. No issues with it. O did have to buy a oil restrictor for it. My oil pressure starts off at about 90psi.

lol ive been following your build man. looks like a pretty bad ass car.

Anti_Hero0932 · Nov 6, 2018

here is my coupe.

and i forgot i also had my dads 82 hatch for a while as well..

wish i would have never sold the coupe it was my favorite car by far.

90sickfox · Nov 6, 2018

I bought an 82 for my one lady.... it had first issues in the roof. It's in a new home with someone else.

The on3 kits have come a long way. I'm happy with the turbo I have but would love a turbonetics or precision turbo.

The 76mm on3 turbo upgrade is decent. My engine is far from stock though.

Oil changes and proper timing is the key to the life of a turbo.

Anti_Hero0932 · Nov 6, 2018

ill just roll with the stock turbo then for a while. its only a 230 dollar deduct if you take it off the order.

other than that the 60 lb injectors should be fine right? im just gonna have someone dyno tune my car with a chip burner

wiseguyk · Nov 6, 2018

Anti_Hero0932 said:
ill just roll with the stock turbo then for a while. its only a 230 dollar deduct if you take it off the order.

other than that the 60 lb injectors should be fine right? im just gonna have someone dyno tune my car with a chip burner

I'm also running the On3 kit and as @a91what can attest to, the 60lb injectors were too much for my 306 GT40x combo. The issue with them was the minimum pulse width not being small enough to allow the engine to idle without surging terribly.

I just went with the On3 "recommendation" and wish I had done more research first. I'm now running Ford 47lb injectors and they are perfect for my combo.

I freakin LOVE the car with the turbo though man, you definitely won't regret it. Though you might want to consider a tune-able ECU so you're not at the mercy of a dyno shop... Just my 2c anyway

90sickfox · Nov 6, 2018

I run 42lb injectors... they seem to do well. I run 43lbs fuel pressure.

I couldn't imagine getting my car running right without mspnp2. The Stinger Pimp or ms3 are the best right now. The chip tunes are still relying on a 25+ year old ECU.

Anti_Hero0932 · Nov 6, 2018

yeah i just heard from the guy i want to tune my car he recomends the ms3.... i dont really have the 900 to spend at the moment.... we will see what happens i still have a lot of work ahead of me before i need to worry about that i guess. he said he likes it cause you dont have to use a MAF.

FoxMustangLvr · Nov 6, 2018

Anti_Hero0932 said:
yes sir pretty well factory besides e cam gt 40 intake. hogged out e7's and the usual little things like 75mm tb and egr delete.

most my friends have cammed ls cars i think it would be pretty funny to go out with a stock headed fox and hurt some feelings. i just sold a cammed z28 that made 368 rwhp and it was pretty fun. this fox is lighter and has the potential for more horse and a lot more tq

You'll do well with that combo. I have a stock 302, stock untouched E7's, explorer lower intake, all being fed 11psi via Kenne Bell supercharger. My car moves pretty well.

FoxMustangLvr · Nov 6, 2018

Anti_Hero0932 said:
yeah i just heard from the guy i want to tune my car he recomends the ms3.... i dont really have the 900 to spend at the moment.... we will see what happens i still have a lot of work ahead of me before i need to worry about that i guess. he said he likes it cause you dont have to use a MAF.

It's speed density based, you can choose to run a MAF or toss it if you want. I run a Stinger Pimp ECU and I've never tuned before. I received great help from this forum in regards to SAFE tuning. Look for the MegaSquirt self tuning threads.

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