1FZFE Turbo setup?

[scottryana]

It does but the size of turbo I recommended is so lightly stressed due to size it won't have any problems making 6psi at 0ft, 5,000ft or 14,000ft. If you were building a race car with a specific boost target at sea level you wouldn't use a turbo big enough to produce the same boost at 14,000ft because it would be larger and spool slower, but that is not a problem with or application.

 

[HDJdreams]

Any books you would recommend?

I was looking at the turbo book (2008) and engine management book (2007) sold by SA Design, seem to be some of the most recent ones on Amazon.

Thanks

 

[scottryana]

One of the best reads out there, even though it is a little dated, but that covers a lot of material with regards to forced induction is:

Maximum Boost: Designing, Testing and Installing Turbocharger Systems by Corky Bell.

 

[4rings5cyls]

Paging turboFZJ80...he lives in Aurora and has a mild turbo set up running about 6 psi on stock engine management. Might be worth a meet up one of these days.

 

[cheddar bob]

Is there a turbo out there that pretty closely matches the TRD supercharger mapping at a certain PSI? That would alleviate any fueling worries. Bump it up a little at a time and watch the AFRs. Stop when it gets to hairy.

 

[turboFJ80]

Hello,
I also have the Maximum boost book which is how I based my design ( 8 years). Sorry never did a write up, one of those thing I need to do! What I do know is that the OBDI is not tolerant with boost, blew a hole in the #1 piston, even with 2 additional injectors controlled by a Split Second AIC1-A2L pulling a trailer east bound from Vail. Limped home to Denver on 5 cylinders and 4 quarts of oil. Replaced engine with ODBII (lots of re-wiring).
I am very happy with performance although would like to change to an air to liquid inter-cooler. Most of my install is off the shelf, some fitting and welding for intake and exhaust. Oh yeah it still pass Colorado Air Care emissions!

 

[scottryana]

You can't directly compare the two. SC compresser maps are a function of rpm. They supply the same amount of air at a given rpm because it's just a function of crank to SC Pulley ratio and screw displacement, while a turbo can have drastically different flow at the same RPM because it's based on exhaust gas so indirectly based on load. if you sized a turbo with the same size MAX flow map as the SC you would blow your engine.

Is there a turbo out there that pretty closely matches the TRD supercharger mapping at a certain PSI? That would alleviate any fueling worries. Bump it up a little at a time and watch the AFRs. Stop when it gets to hairy.

 

[BILT4ME]

A supercharger is a positive displacement pump, whereas a turbo is a high pressure "fan" and will move whatever MASS of air it can draw at the given RPM based on air pressures both at inlet and discharge. The lighter density of the air (higher elevation), the faster the turbo will spin given the same combustion characteristics, because the outlet pressure (static resistance) is lower, and the turbo will spin faster due to more expansion of the gases at a lower exhaust back-pressure, thus pull more volume to get the mass due to the higher RPM. This is why turbochargers work better at elevation than superchargers. To run the same supercharger in Denver as you do in Florida, the supercharger must turn slower in Florida for the same mass of air to keep the engine running properly.

The turbocharger is definitely the way to go if you can get it intercooled and sized properly, as it will give a wider range of power, and it will be more consistent as elevation changes. So those that live in higher elevations, look to turbos and sell your superchargers to all of us "low-lifers...." Turbo lag is not that big of a deal.

 

[HDJdreams]

@scottryana

In your other post, you recommend this turbo, with the V Band flange:

http://www.full-race.com/store/turbos/borgwarner-airwerks/borgwarner-s200sx-7670-turbo.html

On the turbo, do you recommend the 1.22 A/R T4 Twinscroll? (Not even sure what that means yet, but it looked like the default option.)

 

[scottryana]

Any of the T4 twin scrolls will be fine. The smaller the A/R housing the faster the spool since the exhaust gases get forced down a smaller hole, the larger the A/R housing the slower spool but the more high end hp you can make since there will be less restriction.

In this application back pressure will likely not be an issue. In this application you are going to run this turbo around 6-7psi and maybe 30-32lbs/min of air, much less than it's max of 58lbs/min. The 1.22 A/R will be fine help with the closed loop issue and save yourself $100.

 

[Heckraiser]

If you want spool off idle you need to address fueling. Stock computer is looking to hold you at 14.7:1 under those low rpm low throttle positions. 14.7:1 with positive manifold pressure is going to be a problem.

Well let me rephrase that. No engine tuning is a priority at least for the first version. What would be the smallest turbo size that would get along reasonably well with the stock computer?

 

[scottryana]

The one I already recommended it really is a small as I would go, to be safer really you could go up a size.

 

[HDJdreams]

scottryana and turboFJ80,

What kind of MPG do you get? Did you notice a change after the turbo? Are you using Premium or Regular?

 

[scottryana]

You must use premium and you can get the same MPG you do now if you stay out of boost or you can get less if you go around heavy for spooling the turbo all the time. I have seen 15mpg all highway with crap 91 octane and I have seen as low as 9mpg all city when I first got the truck done and would punch it from every stop sign and stop light

 

[HDJdreams]

scottryana and turboFJ80,

It sounds like you set you systems up for minimal boost at idle to keep the computer happy. What rpm do you feel the boost come on?

 

[scottryana]

I have a standalone computer, large injectors, different turbo, running almost 3x more boost than I am recommending, etc. I feel boost almost immediately.

 

[CruiseOrlando]

I think we should install an ALS/bang-bang on an 80 an see what happens.

Well, that is after you pick the exhaust system off of the ground...

 

[scottryana]

The Haltech has it, I have just never used it or set it up. More than the exhaust I would be worried about the transmissions saying eff you.

 

[HDJdreams]

I have a standalone computer, large injectors, different turbo, running almost 3x more boost than I am recommending, etc. I feel boost almost immediately.

All that and you can still squeeze out 15 mpg?

 

[scottryana]

Yep, off boost you get the same mileage you get stock.