Here is the deal, I picked up a Vortech T-trim kit for my car(94 Z, M6)pulleyed for 6 LBS, it came without a fuel pump. I ordered a Walbro 255 HP pump and plan on installing it stand alone. I plan on tuning this thing without the FMU (I have laptop, tuner cat, freescan,datamaster etc) I have a couple of questions, when tuning it how do things work, in reguards to the MAP not being able to read boost? From what I have read there isnt a way to change MAP sensors and get the PCM to understand the input. So how is it done?
2) I like the idea of blowing through the MAF, what are the advantages and disadvantages to this?
3)I am thinking about keying the hub to the crank, this is a good idea right?
4)What size injectors am I going to need? The internals are stock, long tubes and cat back.

Anything else I need to do? am I forgeting anything? some more good idea's?

 

The MAP will read manifold pressure (or lack thereof), but the ECM does not recognize boost, whether it's bar or psi.

It is easier to tune, plus you can vent the bypass to atmosphere (makes neato noises then).

Very good idea on a supercharger motor. I had mine double keyed (crank hub is cut to match the crank keyway). Ironically, I'm running a turbo setup now.

A 42# injector is a good starting point. You may be able to slip by with a slightly smaller size, but the 42s are pretty common on a system w/o an FMU.

I'd also be very careful running that T-trim on a stock motor. That's asking for some big piston problems.

 

Can you expound on tuning it, I guess I realize the PCM wont recognise boost so how do you keep it from getting lean? Does the MAF showing more airflow add fuel under boost? or how do you get it dialed in?(obviously blowing through has an affect on this...)

 

Get a wideband on it and add/remove fuel where needed. Running an MSD 6BTM will make it a little easier since the BTM will read manifold pressure (boost) and take out a preset # of degrees of timing out per pound of boost, up to 12* total. For instance, if you want to take out 1.5* of timing per pound of boost made (which is what I did to be safe), @ 5#, you'd be pulling 7.5# of timing. It's a pretty handy little device when you're just starting out.

 

I am thinking that there is a way to tune it without useing a timing box, I understand the need for the added spark intensity but would like to have it tuned all in the engine's computer.
Are all the guys that tune out the FMU still using an MSD or the crane box to pull timing?

 

We built a similar car last year , just used an s trim and ported lt4 heads and a hot cam used 50 pound injectors tuned on a dyno with good fuel and had the crane high 6 btm with the dial on 0 for tuning and used it to take timing out with pump gas. Made 477 rwhp on ARE dyno with there tuning ( they probably have tune on file).

Car has stock internals and is still running strong went 11.77 at 123 at cayuga last year.

John Carpico

 

there is filies floating around on the net. I would find one that is similiar to your combo, it makes a good starting point.

 

Hi all I am putting a turbo in the 2002 35th ann. V6 Camaro...

But i'm not sure where the Vacuum line off the TB is...
the older 3800 series 2 engines its in the passenger side of the TB....this bieng the line tapped for the FMU, BOV, wastgate, and boost gauge...If anyone knows where GM changed this to..it would be greatly appreciated..Thx

 

HUH? where did that come from?

Anyway, I found a tune, from the car this blower cam off of, and will start there, but I need 42# injectors.....

 

It came from a vision in my brain....and the kit is now sitting on my
livingroom floor...waiting...

Now I know it is just a V6..and this is Z28 territory...

But most of the turbo knowledge comes from V8 er's

 

You'll probably want to try starting your own thread instead of hijacking someone else's.

 

That would be a great idea!

This is the second post you've tried to hijack! Who gives a flying F$$k about where the old camaro's vacuum lines are. You can tie into ANY vacuum line or port on the intake manifold for boost gauge and BOV. Wastegate line gets plumbed off the turbo directly. If your waiting to install a whole turbo kit because you can't figure out where a vacuum line goes, I would leave that kit on your floor. I'd be willing to help anyone out reguardless of the engine size, but posting in someone eles's thread isn't going to get you any info.

BIll

 

The MAF will read the air flow in gms/sec and the computer will supply a certain amount of fuel to satisfy that air flow rate. If you go into power enrichment, then the computer will add some extra fuel on top of that.

You can tune without the timing box, use LT1 editor or Tuner cat to modify the advance at WOT, but the box makes things so much easier and flexible. If you run good fuel, just dial the timing up a bit.

I'm using both the FMU and MSD 6 BTM and they work just fine.

And what mongse said, get a wide band dyno tune.

Hope this helps

LWM

 

I'd keep the BTM. If you program the timing into the computer, it will keep that timing whether the car is in boost or not. With the BTM, you can run a more agressive timing curve for when the car isn't WOT/making boost, and the box will pull the extra timing when you do start making positive manifold pressure. Plus you can easily adjust the *** for a batch of bad gas, or if you go to the track and use some higher octane stuff. Much easier and better results, IMO.

 

How many times when just cruising around are you going to be in the 100kpa map when your not at WOT? Not enough to warrent the BTM in my opinion. Set the timing in the 100KPA part of the map for boost and pocket the money you saved from a BTM. I'd be willing to bet you would never know the difference. If you don't have LT1 edit or tunercat then maybe the BTM would come in handy.