A few boost questions

[chris]

1. putting in a 2 or 3 bar map sensor with these is the pcm able to read boost and can you flash the correct tables into the pcm for this ?

2. Fuel: would the basic walbro pump and upgraded fuel injectors be fine low boost talking 5-8 psi

Do you need an aftermarket fuel pressure regulator that can account for boost?

3 WasteGate and Bov. Do you set them to the same spring pressure?

I was reading an installation for a universal bov and it says to install and keep adding washers to the spring till the car idles fine. Nothing to elaborate. The waste Goes on the Hot side of the turbo on the exhuast side. And when it opens does the exhuast just get vented or are you supposed to weld a pipe to after the turbo to dump into?

4. On a 94 Pcm is a turbo system fairly tunable by mail order to get a baseline then get a dyno tune?

5. I am unsure of cutting the front of my bumper up . Can I just mount the intercooler with 2 cooling fans behind it?

6. for oil cooling how much extra oil does the motor need to support oiling a rear mount turbo? As well instead of AN lines what is wrong with using steel tubing and just double flaring with hardware



I am planning my tax return for next year and trying to see if I want to do this.

My car is currently hot cammed with supporting mods. I mainly want to build the kit for experience and to get a better understanding of the turbo world. I would ideally only run 4-7 psi so I am pretty sure the engine would be fine. Who ever I get the tune from I would like them to keep it conservative even if it will cost me power

[chris]

http://ltxtech.com/forums/images/misc/wireless.gif

Bump?

[Jay_rich]

1. putting in a 2 or 3 bar map sensor with these is the pcm able to read boost and can you flash the correct tables into the pcm for this ? 2 bar is possible (has to be speed density and isn’t the easiest thing to do. If your running 8psi or under stay 1 bar MAF..im making 583RWHP thru my maf by just adjusting the PE tables after the maf maxes)
3 bar has not been done on an LT1 from my understanding

2. Fuel: would the basic walbro pump and upgraded fuel injectors be fine low boost talking 5-8 psi
Yes a basic 255lph walbro should support 550ish HP

Do you need an aftermarket fuel pressure regulator that can account for boost?
I run an aeromotive (it adjusts fuel press in boost)

3 WasteGate and Bov. Do you set them to the same spring pressure?
Run a 50mm wastegate to help control low boost. I also run a 50mm BOV

I was reading an installation for a universal bov and it says to install and keep adding washers to the spring till the car idles fine. Nothing to elaborate. The waste Goes on the Hot side of the turbo on the exhuast side. And when it opens does the exhuast just get vented or are you supposed to weld a pipe to after the turbo to dump into?

Not sure what this means, a BOV just relieves pressue when the throttle is shut quickly to avoid air going back into the turbo

4. On a 94 Pcm is a turbo system fairly tunable by mail order to get a baseline then get a dyno tune?

Yes, PCMforless can do this, or just ask some guys on Camaroz28 they helped me by giving there basetunes to me and I adjusted for my car

5. I am unsure of cutting the front of my bumper up . Can I just mount the intercooler with 2 cooling fans behind it?

Up to you, the more air you get into the intercooler the cooler ur IATs will be, this will help to prevent detonation. (I would suggest METH also)

6. for oil cooling how much extra oil does the motor need to support oiling a rear mount turbo? As well instead of AN lines what is wrong with using steel tubing and just double flaring with hardware

Not sure as I have a Morosa 7.5 Quart on my car….I would also use Braided line. You wont like making and bending lines to run to the back of the car , it’s a pita, also you want some flex for when the motor torques

There Ya go, PM me if you have any questions, or post here.

Jay

[chris]

Thanks for the post Jay. I understand this is some pretty basic stuff but I want to get a good understanding on everything before I dive it.

Are you using the factory map sensor?

I personally think that the tubing would be the way to go for me. I was planning on using 1 4 foot piece under the car and a flex line ( Like what is used for the rear end) This way I can have flex in the system have one side go to the turbo and use the other side for a pressure switch. Should be cheaper than buying all the an line ( Im not sure but in my theory it seems it will )

I know someone who is a frequents on Camaroz28 I actually have his tune in my car right now. Just I am not sure if he has tuned a turbo car before so I was looking for a baseline somewhere.

Do you have a part number on which fuel regulator you are using? Are you just stock system with the upgraded injectors and pump?

obviously I am not going to be building a car like as in your sig but it should be a fun project.

[Jay_rich]

I have 2 intank walbro 255s, -8 braided feed, -6 braided return, aeromotive AFPR (not sure on part number i forget), 60# seimen injectors, modified rails with -8 fittings.

and yes it is the factory MAF and MAP.

Also mine was originally suppose to be just a fun project haha..made 411rwhp N/A then I turboed it and i destroyed my build 4l60e within 30miles, then swapped the rearend just incase hahah Ended up spending alot more then planed!

Jay

[MoeHorsePower]

1. putting in a 2 or 3 bar map sensor with these is the pcm able to read boost and can you flash the correct tables into the pcm for this ? 2 bar is possible (has to be speed density and isn’t the easiest thing to do. If your running 8psi or under stay 1 bar MAF..im making 583RWHP thru my maf by just adjusting the PE tables after the maf maxes)
3 bar has not been done on an LT1 from my understanding

2. Fuel: would the basic walbro pump and upgraded fuel injectors be fine low boost talking 5-8 psi
Yes a basic 255lph walbro should support 550ish HP

Do you need an aftermarket fuel pressure regulator that can account for boost?
I run an aeromotive (it adjusts fuel press in boost)

3 WasteGate and Bov. Do you set them to the same spring pressure?
Run a 50mm wastegate to help control low boost. I also run a 50mm BOV

I was reading an installation for a universal bov and it says to install and keep adding washers to the spring till the car idles fine. Nothing to elaborate. The waste Goes on the Hot side of the turbo on the exhuast side. And when it opens does the exhuast just get vented or are you supposed to weld a pipe to after the turbo to dump into?

Not sure what this means, a BOV just relieves pressue when the throttle is shut quickly to avoid air going back into the turbo

4. On a 94 Pcm is a turbo system fairly tunable by mail order to get a baseline then get a dyno tune?

Yes, PCMforless can do this, or just ask some guys on Camaroz28 they helped me by giving there basetunes to me and I adjusted for my car

5. I am unsure of cutting the front of my bumper up . Can I just mount the intercooler with 2 cooling fans behind it?

Up to you, the more air you get into the intercooler the cooler ur IATs will be, this will help to prevent detonation. (I would suggest METH also)

6. for oil cooling how much extra oil does the motor need to support oiling a rear mount turbo? As well instead of AN lines what is wrong with using steel tubing and just double flaring with hardware

Not sure as I have a Morosa 7.5 Quart on my car….I would also use Braided line. You wont like making and bending lines to run to the back of the car , it’s a pita, also you want some flex for when the motor torques

There Ya go, PM me if you have any questions, or post here.

Jay

Well this statement is not entirely true, Correct about being under 8psi and 1 bar but the 2 bar having to be speed density is not, I run 2 bar with a stock maf and put down 722 RWHP on fast gas and 648 RWHP on Pump gas, It's it the tune...

[Jay_rich]

Well this statement is not entirely true, Correct about being under 8psi and 1 bar but the 2 bar having to be speed density is not, I run 2 bar with a stock maf and put down 722 RWHP on fast gas and 648 RWHP on Pump gas, It's it the tune...

ahh, never knew anyone has done a 2 bar with MAF...i need you to come tune my car!

Jay

[Z28pr0jekt]

Moe is a tuner :)

[chris]

So I am perfectly fine running the stock MAF and MAP sensor is what I am seeing correct?

[Jay_rich]

So I am perfectly fine running the stock MAF and MAP sensor is what I am seeing correct?

Yes you will be perfectly fine, as I said I have a stock MAF AND MAP and run 8psi making 583RWHP. NO ISSUES.

Jay

[chris]

http://ltxtech.com/forums/images/misc/wireless.gif

Any recomendations on what size injectors to run? I am going to start the calculations n what not latter today

[BLOWNDFIZ]

Go with 60's it'll give you room to grow.

[Jay_rich]

I run 60's on my car..... they are good till 750-800 FWHP @80% duty.
I will eventually be stepping up to 96+ after I have megasquirt on my car.

Jay

[popo8]

ANother one running 60's....RIGHT HERE>

[CALL911]

I'll add a couple of things;

I also would go with 60# injectors. I reccomend Mototron.

You can do everything on your stock MAP sensor and MAF. I know this, because it is what I am running :)

I DO NOT agree with what someone posted about the single 255 lph pump holding out to 500+ RWHP. The absolute most I would push a stock pump would be 400 ish at the wheels. Anything north of 450 RWHP and you are asking for problems, and trust me when I say running out of fuel on a boosted car would be a catastrophic problem that would only happen once for you to realize you are totally screwed. Do yourself a favor and just get a second boost referenced pump, or a larger single pump.

I didn't want to hack my bumper up either, and you don't have to for your intercooler to cool the IAT's down. Keep in mind that hacking up the front bumper would allow for the best airflow to the intercooler, but there are other ways to get air directed to it than having a huge ugly front bumper.

Meth injection would be the biggest helper. If you don't want to go with meth, just get someone to fab up a custom inlet from under your car to help direct air flow to the intercooler. Thats also what I did, and my IAT's still are nice and cool.

[Jay_rich]

I DO NOT agree with what someone posted about the single 255 lph pump holding out to 500+ RWHP. The absolute most I would push a stock pump would be 400 ish at the wheels. Anything north of 450 RWHP and you are asking for problems, and trust me when I say running out of fuel on a boosted car would be a catastrophic problem that would only happen once for you to realize you are totally screwed. Do yourself a favor and just get a second boost referenced pump, or a larger single pump.


I have a few friends running right around 500hp on 1 255. Me personally, wouldnt use one after 500hp this is why I am running 2 intanks. but from looking at his post his isnt building a 500+rwhp car anyways.

Jay

[CALL911]

I have a few friends running right around 500hp on 1 255. Me personally, wouldnt use one after 500hp this is why I am running 2 intanks. but from looking at his post his isnt building a 500+rwhp car anyways.

Jay

One 255 lph pump cannot safely hold that power. Call some of the big time shops like Lingenfelter or someone else who has been around successfully for a long time, they will agree. 400 RWHP is about the max safe wise for just one pump. I do believe you that some of your friends may be doing it. But simply, they are playing with fire. I'm sure you could probably throw a 250 shot of Nitrous on a stock LT1 with no upgrades as well, and there would be a handfull of guys who could do it for a while without instantly grenading their car. But eventually, they would end up on the side of the odds.

My point here is, even if the OP is not building a 500 RWHP car, I don't want anyone else looking at this thread for info to think they can build something that powerfull and safely get away with it just running one 255 lph pump.