GT35+3500

[ericjon262]

got a stock 3500(Lx9), and a GT35 turbo:

Compressor trim: .70 ar
Compressor Wheel diameter: 57.36 /81.87
Turbine wheel diameter : 57.50 /73.60
Exhaust trim: .63ar

anyone care to give any recommendations on what size WG and BOV to run? it's going into an 85 fiero with a F23 fiver speed.

I'd like to run about 15-18 PSI once it's dialed in.

Thanks-

Eric.

[1988GTU]

44mm External waste-gate would be my suggestion. For a BOV, its all preference to how much room you have, what sound you like, and the styling you want. I personally like the greddy line up, but only because they seem to handle the abuse and you can also by the knock offs to swap in the real guts and have best of economics and end product.

[ericjon262]

well, I have another question, what size injectors should I run?

[Mars]

60 or 80.

Get the Siemens Motron ones. they are excellent.

[ericjon262]

anything that big probably is an aftermarket only deal aren't they? looks like I'm going to end up around $400 deep in a set of six...

[ericjon262]

I'm going obd2 with the engine management, I would need high impedance injectors right?

I haven't heard anyone say otherwise, but is a GT35 a pretty good match for a stock 3500?

[Mars]

Yup good match for sure. You'll want to add a cam later on I bet.

High Imp. for sure. Around 14 ohms i think ?

[ericjon262]

once the car is "done" and the house is "done" and the trucks are "done" and most importantly, once the shop is "done" I'll buy another LX9 or a 3900, and do a full build. I'd like to do a 3.9, bored and stroked to 4.3, I did the math, and I think it's doable...

[ericjon262]

I think I may use a air to water intercooler mounter under the trunk, or a air to air, but finding a place for an air to air isn't very easy....

[ericjon262]

any recommendations on where to get the a to w parts?

[ericjon262]

Mars, what are you using for your oil feed? got a build thread I could check out?

[ericjon262]

you know, I hadn't really thought about it until now, but what am I going to do about my vacuum accessories? mainly my brake booster... I guess its time to invest in a vacuum pump?

[Z26-T]

you know, I hadn't really thought about it until now, but what am I going to do about my vacuum accessories? mainly my brake booster... I guess its time to invest in a vacuum pump?

I'd imagine you won't always be creating boost. For the times that you're not, your booster should fill with vacuum. That is if the valve going into your booster is working properly. I'd recommend re-routing your pcv to your exhaust. If you're worried about other accessories install a 1 way valve so the boost doesn't go into them. If you find that your engine doesn't create enough vacuum, then invest in a pump .

For oil feed, most people T off the oil pressure sending unit with an SS line. For the drain, most just drain into the pan above the oil line. Since that is a gravity feed style, make sure the drain doesn't have to go "uphill". If your drain isn't sufficient, oil can build up and leak past the seals.

[ericjon262]

ok, that's what I was figuring on for the oil, and I guess I'll install a vacuum can with a check valve. My turbo will be mounted above my transmission, so I don't see why I would need any kind of flex coupling between the engine and the turbo, I can see why one on the downpipe is a good idea. should I install my o2 sensors pre or post turbo? Is an egt probe necessary? should I just plug the remaining vacuum ports on the engine? sorry for all the questions, I jumped into the turbo world a little quicker than I thought!

[Z26-T]

Depends what the vacuum ports are for.. If there are sensors involved i'd keep the lines there with check valves. All the o2s i've seen have been post turbo. You will need some flex in the exhaust. EGT isn't as necessary as a vac/boost gauge and wideband. Though it's not a bad idea to have. As recommended with all turbo kits, reading the book maximum boost by corky bell is a good idea.