Vortech T-Trim injector sizing, compressor map
 

Looking at this compressor map, I'm spinning about 48,500 RPM at shift.

I'm guessing that's right around 80lb/min flow.

Ignoring everything else about the combo, what is the smallest injector you guys would run?

I'm running 42's right now and I'm thinking they might run out of fuel.

Now in contrast, I used to run an S-Trim. Spinning it at 49,000 RPM and it only made 550hp (crank), where according to the compressor map it should have been putting down around 70/lb min. That combo ran 36lb injectors.

-- Joe
https://cimg6.ibsrv.net/gimg/www.thi...ba2f0df37a.gif

Re: Vortech T-Trim injector sizing, compressor map
 

That doesnt seem to make sense. 70-80 lb min would be 700-800 hp roughly. Blower consuming 70-80 of it, leaving 630-720 crank hp net

A 42 would be taxed. That would need a 60 imo

If it is making 550 net, then its likely flowing closer to 60 lb min

I dont see how 36’s worked either lol. Do you know what the duty cycle was? What fuel pressure?

42 usually is maxed near 600-650 hp roughly

Re: Vortech T-Trim injector sizing, compressor map
 

Duty cycle was near static, so lets say static. Fuel pressure was 50psi.


3640lb car trapped 120mph at 90 feet elevation. I'm coming up with around 550 crank HP to do that. Yet, the blower RPM should translate to more HP according to the compressor map. I think the maps are generous.

-- Joe

Re: Vortech T-Trim injector sizing, compressor map
 

That might make more sense then. If rated36 at 43.5 psi fuel pressure then they would flow closer to 39 lb and really efficient setup might squeeze that at 100% duty

I would lean towards a 60 siemens deka to give plenty of room on duty cycle and more blower speed

Or a 42 rated at 43.5 you can crank up to 58 psi base. Get you closer to a 48-49 and run it hard if pump keeps up

Re: Vortech T-Trim injector sizing, compressor map
 

I would say at a minimum 60's. My car did 430whp last week with lots room for improvement according to the tuner and it was at 46% DC. (V3 Si on 6 lbs)

Re: Vortech T-Trim injector sizing, compressor map
 

yes minimum 60's imo. no need to cut it any closer than that.

Re: Vortech T-Trim injector sizing, compressor map
 

Which 60s are you running? I may bug you for a copy of your tune to see your injector settings. The Siemens have a 1.14 msec turn on, and .84 msec turn off. (that's really terrible lol). I'm running alternating batch firing strategy right now on the Ford 42's and the car runs amazing. I don't wanna lose idle or part throttle drivability.

I added a PATC modulator boost kit to the TH350 and it actually shifts beautifully now!

Luckily the car hasn't got enough traction to make enough boost to melt down yet. At 30mph even moderate throttle transition lights the tires on fire. I even bought brand new soft tires. It's simply not possible to give it too much throttle on the street, *** end kicks out.

I'm thinking on a prepped track, or dyno, it will make a ton of boost though.

-- Joe

Re: Vortech T-Trim injector sizing, compressor map
 

My brochure states 1.3/.7 opening close. 0.44 ms offset. Min linear pw 1.5. Min pw also listed at 1.31 ms

Voltage offsets
15v. .407 ms
14v .488 ms
13v .599 ms
12v .706 ms
11v .837 ms
10v 1.017 ms
8v. 1.546 ms

Min open close are same as the siemens 80’s which i ran on 730 code 59$ just fine on my first 400 setup

Re: Vortech T-Trim injector sizing, compressor map
 

Whats weird is my ecm log pulsewidth at idle was 1.1-1.2

Other logs showed 1.34 at batt volt of 12.2

Re: Vortech T-Trim injector sizing, compressor map
 

Were you running $59 on an actual '749?

From what I understand, a '749 will queue up injection events that are under the threshold, but I don't know if it's reported in the ALDL stream.


With the 42's, I idle around 2.8-3.0 msec right now with alternating batch fire.

I think with simultaneous batch, it would be 1/2 the pulse width and probably cause problems.

-- Joe

Re: Vortech T-Trim injector sizing, compressor map
 

No it was 730.

Ran bosch 36’s on 730 as well in my 305. Both 8d and 59$

Re: Vortech T-Trim injector sizing, compressor map
 

Got me. I don't know what happens exactly when you command a pulsewidth shorter than the open time. One would assume you get no fuel, but I don't own an asnu to see.

So I guess I'll try some 60s.

Do you think looking at that compressor map, based on the impeller speed that it's making around 800+hp ?

Part of me wants to say the Vortech maps are generous based on my own experience with an S-Trim, but then again, that car had crappy sportsman II heads, so maybe it would have made more power. My 412 has good heads.

-- Joe

Re: Vortech T-Trim injector sizing, compressor map
 

How much boost were you running and do you know the iat temp?

Re: Vortech T-Trim injector sizing, compressor map
 

14psi on the S-trim/355 combo, around 180 degrees.

It weighed 3640 lbs and trapped 120mph ever pass. What's your flywheel HP estimate on that? I came up with about 550. Stick car.

-- Joe

Re: Vortech T-Trim injector sizing, compressor map
 

Here's a log of my old Lucas 42s @ 60 psi hanging in there up to 140 mph (data exported from TunerPro). Log includes WBO2, extended air flow and load signals along with MAF air temperature (post intercooler) in addition to standard data stream items:

links work better with chrome or firefox. IE may have trouble with it. Datazap allows you to zoom in/zoom out and turn signals on or off for display as desired. Feel free to play around.

https://datazap.me/u/tequilaboy/140-...1533&mark=1443

P600b 383 with 4" core intercooler, 4L80E and 3.73 gear. 1986 Y-body, MAF car w-165 ecm.

I think this was about 12 psi at the manifold...15-16 or so at the blower. With this configuration, 42s have provided enough fuel for about 6,800 rpm. Don't think this log peaked that high. P600b should flow up to 1150 cfm and be somewhat similar to a T-trim.

Here's one around 6800 rpm:

https://datazap.me/u/tequilaboy/6800...&tmax=42002.05

This car flows around 60-65 lb/minute depending upon the air temperature.

Re: Vortech T-Trim injector sizing, compressor map
 

Yeah 500-550 seems reasonable. 2.0 pressure ratio doesnt line up with 49,000 rpm blower speed but pressure at blower may be higher? Not sure.

180 deg is hot so theres power lost there for a given mass flow. Map shows corrected weight flow? Or do they want you to adjust via the equation?

Either way, the old heads being not near as good as afr 210’s, you’ll probably see less boost at same impeller speed cuz the motor will be ingesting more air. That motor on 14 psi will be over 600 whp thru a manual trans. The 383 d1sc i tuned had 195 afr’s and a 224/230 xfi cam with big tube tpi and was 550 whp or so around 8 psi at 4500-4600 lol. He had 60 lbs but i dont know the duty cycle. Ebl flash tuned

Re: Vortech T-Trim injector sizing, compressor map
 

The pressure ratio thing never made any sense to me. The airflow from impeller speed seems straightforward, but how the heck can they predict what the pressure ratio will be? I'd assume the same airflow on a 5 liter motor wouldn't produce the same boost as a 8 liter.

I have no idea on the map if it's corrected. They are not very helpful with these questions.

The old setup was a 355, this is a 412.

I was shooting for 600 fwhp. This combo might be a little more powerful than I wanted. Ugh.

-- Joe

Re: Vortech T-Trim injector sizing, compressor map
 

11:1 and a good 240 deg cam will get near 600 flywheel on a 412 lol

Might have to change pulley and drive it slower

But aint a problem having 500-600 at the tires....well except your block might not like it

Re: Vortech T-Trim injector sizing, compressor map
 

Will idle like **** though. I used to run a cc306 for 1 summer on one of my vettes and it was terrible.

I like the idea of the smaller pulley at low RPM. Maybe I could buy an electronic wastegate and tie it into my MS to provide some boost control.

-- Joe

Re: Vortech T-Trim injector sizing, compressor map
 

Cc306 is a bad example lol old lazy lobe. Sounds bad arse tho and does make ok power. Get a faster lobe and it wont be to bad. My turbo car wasnt bad 246/252 .640” you wouldnt need to go quite that big i dont think

Re: Vortech T-Trim injector sizing, compressor map
 

I dunno. I guess if I ever lost interest in the blower and decided to mill the heads, but for now everything works.

I ordered some Siemens 60s.

-- Joe

Re: Vortech T-Trim injector sizing, compressor map
 

Sorry for the delay, just got back from vacation.:cool: Siemens Deka, i dont remember what version though. I was never able to find a accurate voltage compensation number for the 60's. I think the 80's was around .130 and thats i think where mine sits at the moment (and it runs fine with all the electrical loads on now) if you want a msq let me know.

Re: Vortech T-Trim injector sizing, compressor map
 

at 13.2V mine sits around 2.5-2.8ms with the 60's

Re: Vortech T-Trim injector sizing, compressor map
 

Could you just take a few screenshots? I've got it running absolutely perfect on the svo 43s and I want it the same with the 60s.

My idle pulse widths are in the low 3s so I'd think I'll be ok in regards to min open time. Thank God for different injection strategy's with MS.

The DIS swap was a great idea too, the ignition is spot on now. No sloppy dizzy.

-- Joe

Re: Vortech T-Trim injector sizing, compressor map
 

No problem, PM me your email