Injectors and boost

Chrisf97305 · May 30, 2011

I have seen some strange things with my truck that just does not make sense.

Back ground on my turbos. I am running 2 T turbos in parallel. they are rated at 60psi and flow 800cfm of air and into a 4' down pipe and side pipe.

With that said here is the question.

injectors are 160cc and flow 15 LPM.
With these injectors and the turbos the truck ran great. real quick throttle response and could pag my 60psi gage with not problem. Well could not let things alone and with the quest for more power I upped the injectors.

New injectors are 230cc and flow 19 LPM
The smoke is up and the boost is down. Now I can only push 45 to 50 psi of boost.
I always though that with more fuel comes more boost. But I am not seeing that. Could more smoke = less boost.

I am still running the same tune with both injectors, do I need to re-tune and check it again. the bottom end (idle to 1500 rpms) is slower but the top end is stronger, but the boost is still only 45 to 50 psi.

Any in-site would help.

Thanks
Chris

co04cobra · May 30, 2011

If you dont have the tuning to run the injectors then you are not getting the fuel to make more boost. Sounds like a interesting setup. Post up some pics of under your hood.

davey99ps · May 30, 2011

I would get new tunes

dirtboy25 · May 30, 2011

Without a doubt... Get the tuning done right and then report back. I bet you see a world of difference.

Chrisf97305 · May 30, 2011

co04cobra said:
If you dont have the tuning to run the injectors then you are not getting the fuel to make more boost. Sounds like a interesting setup. Post up some pics of under your hood.

As you can see there is no turbo's to be seen. only the water to air intercooler.

Chrisf97305 · May 30, 2011

The tune that I am running now is from DP, I called him and let him know what injectors and about the turbo's. He did not think that I needed any special tune to run the combo. I think the only way I will get his tunes to work is with a live tune.
Is there any one out there that may be able to tune the truck with out a live tune?

co04cobra · May 30, 2011

That looks pretty slick. I like it. Try contacting Jonathon at beans diesel. He should be able to get you a good bit more from the new injectors without live tuning.

95powersmoker · May 30, 2011

Chrisf97305 said:
The tune that I am running now is from DP, I called him and let him know what injectors and about the turbo's. He did not think that I needed any special tune to run the combo. I think the only way I will get his tunes to work is with a live tune.
Is there any one out there that may be able to tune the truck with out a live tune?

You switched from 160cc to 230cc and DP said you didn't need any new tunes?

wint · May 31, 2011

95powersmoker said:
You switched from 160cc to 230cc and DP said you didn't need any new tunes?

:whs::doh:

Chrisf97305 · May 31, 2011

I have to correct my self, I reread his e-mail and he said to run it first and let him know if it needed any changes. The problem I have with that is that How do I know what changes needs to be made? Any way I will send him a e-mail and see what he suggest.

Chvyrkr · May 31, 2011

Chrisf97305 said:
The tune that I am running now is from DP, I called him and let him know what injectors and about the turbo's. He did not think that I needed any special tune to run the combo. I think the only way I will get his tunes to work is with a live tune.
Is there any one out there that may be able to tune the truck with out a live tune?

How's the truck idle?

I'd probably want ICP at idle bumped a bit goin from high IP single shots to lower IP hybrids.

And I think with increased PW in new tunes you'll be back to where you were on the boost gauge. I wish I knew better what 15 and 19 LPM worked out to in percentage though.

Chrisf97305 · May 31, 2011

Chvyrkr said:
How's the truck idle?

I'd probably want ICP at idle bumped a bit goin from high IP single shots to lower IP hybrids.

And I think with increased PW in new tunes you'll be back to where you were on the boost gage. I wish I knew better what 15 and 19 LPM worked out to in percentage though.

When cold it lops a little till it warms up then it idles fine. The hpop pressure at idle is 450 to 500psi. watching the gage at full throttle it looks like about 27 to 2900psi.
All I know now is that the nozzles that are in it now flow 19 LPM. I have no idea what stock is, so can't help there.

Chvyrkr · May 31, 2011

12 maybe, it sticks in my mind as stock at least. Thinkin 15 is 30%... 19 = 80% ish. Could be 80 and 100 though so...

In any case I'm thinkin the PW that was called for with the old injectors is probably insufficient for full volume outa the new ones. But I'd think you'd be gettin at least a little more fuel out of the new injectors with faster nozzles on equal PW.

So the lower boost could possibly be blamed on the lower IP.

Or you have a boost leak after the injector swap that you didn't before.

Chrisf97305 · May 31, 2011

I think that its about 80's also.
I know there is no boost leak and the back pressure is just about the same on both sides. After reading the posts I am thinking that i will need a re-tune.

Chvyrkr · May 31, 2011

That's the best place to start.

1996 Scorpion · May 31, 2011

Quick question about your truck, is your water to air intercooler custom made or is it a kit you can buy?

Badge · May 31, 2011

:whs:

Chrisf97305 · May 31, 2011

Here is a link to the intercooler. Good company to get parts from

http://www.siliconeintakes.com/product_info.php?cPath=7&products_id=1008&osCsid=ea80bfaff636ee727667538fe86b334f

Bruno2 · Jun 8, 2011

I bought my CAC boots for the piping from them. I think their sizes run a little different than some of the others. I ordered what should have fit my pipes , but , when I got them they were too big. I sent them back and they replaced them with no problems. However, what they advertise as red sure looks pink.

ITUKMOR · Jun 13, 2011

My first question is this; when you changed nozzle size did get EDM or EH nozzles? Second; what size exhaust housing are you running on these chargers? And lastly; have you monitored drive pressures to determine whether you may have significantly reduced the exhaust velocity by the added fuel? You may need to gate the setup to get the velocity back up.

(edit) What size comp and turbine wheels are you running? Just wondering what size parallel chargers perform well with basic level performance injectors.