Twins issues?

[seeker1056]

Ok, so on the other board I had some discussions regarding my twins performance or lack thereof ;o)

I have now had an opportunity to do all of the things suggested over there and the results are as follows.

1/8 timing bump, fuel screw in as far as I can still get 800 rpm idle, stock injectors, 5" exhaust,

HX35 all by itelf, BOV removed, wastegate disabled: 19 lbs boost at 1400 degrees egt.

I played with the fuel screw a little but it made no real difference except higher egts.

Hx35 and HX55, BOV removed, wastegate disabled: 32 lbs boost 1100 degrees egt.

So i am curious why are the egts so different (less) with almost double the boost?

Is 32 psi total boost reasonable for stock injectors?

Thoughts?
Thanx
Ken

[Cschafer]

Mine hits 40 with a sigle a non intercooled injectors. Have you checked your boost at the turbos and at the intake? You could have a pressure loss with you intercoolers. Have you ground the fuel pin?

[dpuckett]

If your 91 is intercooled, it is reasonable; if nonIC, it is lacking.

My question is, why twins with only 32psi boost? I hit that with my stock H1C and stock sticks with pump tuning and timing only. If your EGT is/was too high, I'd say get the injectors and/or pump checked out.

Daniel

[gman07]

By "the HX35 alone" I'm guessing you mean running it as a single? 19psi sounds way low for a wastegate-disabled HX35. My H1C/E hybrid with the 18.5cm housing does 34psi and around 1300* with stock IC injectors. I'd check for boost leaks.

I think you need more fuel for those twins. At what psi is the wastegate on the 35 set? Is it the stock 12cm housing?

As boost goes up, EGT's go down, up to a point. Eventually the compressor becomes inefficient and/or drive pressures skyrocket.

[seeker1056]

those are my questions...with stock stix...

why only 19 psi with just the 35 and no, there are no leaks anywhere?

I am getting too high egts to get more outa the 35 by itself and let off on it.

why only 35 psi with the twins working?

what should I be seeing for boost?

is this or is this not normal?

yes I know I need injectors and that was a question - what size is best for my needs?

thanx

[wannadiesel]

You gotta have a leak somewhere. With the wastegate wired OPEN I was able to hit 35 psi running POD's.

Low boost + high EGT = leak.

The only other thing I can think of is that you have some sort of frankenturbo built by a dummy who used too small a compressor wheel for the housing.

[seeker1056]

As I said, at the moment I am runnin the stock stix so I can get a baseline.

I am very sure if i installed the POD's there would be more boost but cant be bothered as I will be goin to some form of edm's very shortly.

I am using an external deltagate style wastegate so it cant be wired, but can be disconnected.

With the bone stock hx 35 (no mods), and no leaks (all joints sealed with silicone black rtv) I get high egts, and little boost from it by itself.

Interestingly enough over on the other board I had a few replies that said they couldnt get 35-40 psi with twins and POd's.

If I had leaks I would not expect to see 33 psi with the hx55 connected

I am still looking for tuning advice, and injector suggestions???

[KTA]

You have a problem in your system somewhere. My trailer truck has 370's a stock IC, and 4" muffled exhaust and wont get over 1300deg pulling a trailer with an HX40/16 and 300rwhp. It runs about 32-34psi of boost. The stock IC'd injectors are soo small I don't see how you could have egt problems. My stock h1c/18 with stock non-ic injectors would run over 36psi with egt's around 1400. When I went to my edms it would run 44psi then fall back on boost as rpms climbed, egt's 1800+.

[bgilbert]

First off, obviously you're wasting your time with stock injectors to be running twins of any size. Next it might be time to cancel that silly aftercooler you're running and just go with the air to air.

On the injectors, no need to spend money twice, or more, get in contact with KTA and have a set of his EDM's built from Buddha.

[seeker1056]

Hey Bill, that "silly" intercooler is one of two on the truck and it works and works well, NUFF said!!!!

Bill, I am looking for "constructive" suggestions from people like yourself who might know from experience what to look for, to seek out whatever issue may be happening, not condemnation of my setup, nor scoffing at my workin my way up one step at a time.

Bill, I would also love to jump into edms except one leetle problemo, nobody has yet offered an answer to my question of what size? KTA may have a set that works, but if they are 6 x 18 as I suspect and at $1300, they are $600 more than a couple of our people have already offered to have made for me. I can get 435's for less than $500 and any of 6 x 12 6 x 14 and 6 x18 for $700. i just wanna know what would be the best all around injector. Until then i am stuck usin my stock stix.


So back to my issues at hand

When runnin just the hx 35 it is runnin through the air to air intercooler only, which is the factory Dodge item for that turbocharger.

The drive pressure is 40 psi and the boost on the hx35 by itself is 18-19 psi, no matter what I do with the wastegate. Matter of fact turnin up the wastegate cranks the drive pressure to 50+ psi

To be honest I am beginning to suspect the 35 turbo itself, although it does really scream/sing at 18 lbs.

Unless I have missed something there are no leaks. I am open to suggestions on how to find said alleged leak other than the air pressure test I already did.

And with the hx 55 hooked up the drive pressure is still 40 psi, but boost is now 33 psi or very close to 1-1


KTA - thanx for the examples, but 370's are not stock injectors, nor is the 40 a stock turbo. If i recall you have said the non ic injectors also flow a lot more fuel than ic injectors, so we are still not talkin apples n apples.

Now back to my base question - with the hx35 and " stock ic injectors", what issue am i lookin for "other" than a leak that would cause excessively high egts "and" low boost. Cuz the egts were still climbin when i let out of it cuz i dont know how high is too dangerous.

Thanx in advance for your help
Ken

[gman07]

40psi drive pressure and 19psi boost sounds way off, even for a 12cm housing. Have you checked play in the HX35's shaft? There should be a little side to side (not enough to hit the housing though) and none in and out.

[seeker1056]

there is noticable side to side play, but not enough to hit, and no end to end play.

It spins by hand with slightly more effort than the brand new HX55 does

As soon as the truck fires it is spinnin, but who knows how well?

I am not above replacin this turbo with a new one if i thought that was the issue but would like to be sure the turbo is the culprit first

thanx for the suggestion

[Philip]

The drive pressure is 40 psi and the boost on the hx35 by itself is 18-19 psi

You have a problem somewhere.

What size exhaust housing on the HX35??

How many miles on those stock injectors??

[seeker1056]

no idea on the housing and do not know how to check it. Will the wrong housing cause the high egt/low boost?

It is sposed to be a bonestock 1996 or 1997 hx35 (memory is slow today)so whatever it had for a housing from the factory dodge it came in

The injectors are sposed to be relatively new with some 25,000 km on them.

[KTA]

My point was your egt's are too high for your fueling, not as a comparison to your setup, but whatever the problem is I am shure you will figure out.