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  #16  
Old 06-15-2007, 04:21 AM
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Eh, I was just pointing out that Justin seemed to have the impression (from your reply) that the relatively simple mod you did would be the same in our cars. It isn't. Doesn't mean it can't be done. Same engine, different body style. It is tighter up front in a W124.

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  #17  
Old 06-15-2007, 11:27 AM
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Quote:
Originally Posted by aersloat View Post
Eh, I was just pointing out that Justin seemed to have the impression (from your reply) that the relatively simple mod you did would be the same in our cars. It isn't. Doesn't mean it can't be done. Same engine, different body style. It is tighter up front in a W124.
yeah, thanks for pointing that out. I forgot he drives a 126.

I'm sure it is still quite possible though
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  #18  
Old 06-15-2007, 11:34 AM
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Originally Posted by justinperkins View Post
Just recently I've started to hear my turbo spool up when I get to around 3k rpms. It's really noticable, not something I could have missed before. Nothing has really changed with the engine, except I installed a new air filter about a month ago. I only started noticing the turbo noise about a week ago though.
Get a boost gauge on it immediately and see what you get fully loaded at 3000 rpm or above.

When I had the wastegate hose disconnected from the 617 for a test, the turbo speeds increased markedly and the turbo noise was definitely noticeable. Additionally, the boost climbed up to 19 psi.

Don't ignore this issue...........
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  #19  
Old 06-15-2007, 11:59 AM
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Originally Posted by Brian Carlton View Post
Get a boost gauge on it immediately and see what you get fully loaded at 3000 rpm or above.

When I had the wastegate hose disconnected from the 617 for a test, the turbo speeds increased markedly and the turbo noise was definitely noticeable. Additionally, the boost climbed up to 19 psi.

Don't ignore this issue...........
will do for sure, trying to locate a gauge as I write this.

thanks brian.
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  #20  
Old 06-15-2007, 02:32 PM
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You can pick up a 2" diameter vacuum/boost (up to 30 psi) gauge off the shelf at Advance or Autozone for $40. If you care for the looks, you can even install it permanently later on.
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  #21  
Old 06-15-2007, 09:39 PM
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Originally Posted by Brian Carlton View Post
Get a boost gauge on it immediately and see what you get fully loaded at 3000 rpm or above.

When I had the wastegate hose disconnected from the 617 for a test, the turbo speeds increased markedly and the turbo noise was definitely noticeable. Additionally, the boost climbed up to 19 psi.

Don't ignore this issue...........
OK. I got a cheapo ($40) boost gauge from Autozoo and hooked it up. Went out on the freeway and put it under load. I consistently saw 14psi when I would get on it to get up to 70/80 MPH. I was able to get it to read 16psi (just barely) once or twice by really pushing it, but due to not wanting to drive like a total jackass I couldn't keep it there.

Is 14 PSI under load above 3k RPMs OK or too high?
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  #22  
Old 06-15-2007, 11:40 PM
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Originally Posted by justinperkins View Post
OK. I got a cheapo ($40) boost gauge from Autozoo and hooked it up. Went out on the freeway and put it under load. I consistently saw 14psi when I would get on it to get up to 70/80 MPH. I was able to get it to read 16psi (just barely) once or twice by really pushing it, but due to not wanting to drive like a total jackass I couldn't keep it there.

Is 14 PSI under load above 3k RPMs OK or too high?
14 is OK, but, you don't need quite that much to get full fuel.

16 is definitely excessive and there is no assurance that it stops at 16 if you had it under full load climbing a hill.

Have you verified the wastegate hose is intact with no cracks or leakage?
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  #23  
Old 06-16-2007, 02:35 AM
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Definitely check the hose. Mine was long since rotted in two from the oil via the breather hose and the heat at 132K miles when I bought the beast. Just glad I babied it on the 80 miles home from the dealer until I had a chance to give it a thorough going over.

A piece of 1/4" ID thick wall fuel injection hose makes a workable replacement, until when/if you decide to replace it with the purpose-made hose.

By way of comparison, I tested mine just a few days ago with the same gauge. From 45 mph going up a good hill, I floored it and activated the kickdown switch. Pressure went up to 14 psi and held there, all the way up to 4000 rpm at some ungodly speed where it finally dropped into 4th, and I backed off before the local constabulary could nail me for doing well in excess of the 45 mph speed limit.

Cruising level ground at 55 to 60 boost was 2 to 4 psi. Interstate cruising with cruise control on was 4 to 6 psi at 65 depending on terrain. Holding the cruise lever up for full accel on the interstate to get from 60 to 70 pushed it up to 10 psi, dropped back to 5 psi as soon as I let cruise take back over.

I'll let Brian be the judge whether this is anywhere close to acceptable norms.

Gawdalmighty, but this thing will fly when you floor it!
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  #24  
Old 06-16-2007, 08:47 AM
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Originally Posted by retmil46 View Post
Definitely check the hose. Mine was long since rotted in two from the oil via the breather hose and the heat at 132K miles when I bought the beast. Just glad I babied it on the 80 miles home from the dealer until I had a chance to give it a thorough going over.

A piece of 1/4" ID thick wall fuel injection hose makes a workable replacement, until when/if you decide to replace it with the purpose-made hose.

By way of comparison, I tested mine just a few days ago with the same gauge. From 45 mph going up a good hill, I floored it and activated the kickdown switch. Pressure went up to 14 psi and held there, all the way up to 4000 rpm at some ungodly speed where it finally dropped into 4th, and I backed off before the local constabulary could nail me for doing well in excess of the 45 mph speed limit.

Cruising level ground at 55 to 60 boost was 2 to 4 psi. Interstate cruising with cruise control on was 4 to 6 psi at 65 depending on terrain. Holding the cruise lever up for full accel on the interstate to get from 60 to 70 pushed it up to 10 psi, dropped back to 5 psi as soon as I let cruise take back over.

I'll let Brian be the judge whether this is anywhere close to acceptable norms.

Gawdalmighty, but this thing will fly when you floor it!
Those figures are quite typical. It's interesting, however, that the vehicle can attain 14 psi on a full, extended load. Most won't get quite that high. Mine are both in the 11-12 range. There are no issues at 14 psi, but, it's not providing the engine any benefits, however.
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  #25  
Old 06-16-2007, 11:05 AM
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Possible factors for the 14 psi/4000 rpm - after I repaired the hose, the wastegate actuator hasn't been adjusted. It was full of oil, I sprayed brake parts cleaner well up into it using the small red straw that came with the spray can, then blew out well with LP air using the same method. Definite possibility that it is somewhat out of adjustment.

That is a relatively cheap gauge I was using. I doubt that the calibration standards are to the same degree we used on submarines, and a 1 or 2 psi error either way is a possibility.

ALDA is still virgin. Same oily situation as with the wastegate actuator, and same cleaning method. Verified all lines and ports running to it free and clear.

Overboost sensor is original and was plugged up pretty well. Cleaned it out, but no guarantees.

Some fool kid put BB's in the vac lines to the EGR and ARV prior to the test.

Boost didn't immediately peg at 14. It zoomed up rather quickly to 12, then seemed to strain to reach 14 by the time it hit 4000 rpm.
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Just say "NO" to Ethanol - Drive Diesel

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'87 300D 212K miles
'87 300D 151K miles - R.I.P. 12/08
'05 Jeep Liberty CRD 67K miles
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  #26  
Old 06-16-2007, 11:14 AM
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Originally Posted by retmil46 View Post
Overboost sensor is original and was plugged up pretty well. Cleaned it out, but no guarantees.
I have a suspicion that none of the 20 year old overboost sensors will actually work. The sensor on the 617 doesn't work..........accumulated soot over 20 years probably knocks most of them out.
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  #27  
Old 06-20-2007, 03:33 PM
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Found the problem, my wastegate hose is not cracked it just disconnected from the housing.

I haven't had a chance to replace it yet, since I just finally noticed it while filling up at the fuel station. Is this hose anything special or would they have something suitable at Autozone/Napa Auto/etc..?
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  #28  
Old 06-20-2007, 04:33 PM
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Originally Posted by justinperkins View Post
Found the problem, my wastegate hose is not cracked it just disconnected from the housing.

I haven't had a chance to replace it yet, since I just finally noticed it while filling up at the fuel station. Is this hose anything special or would they have something suitable at Autozone/Napa Auto/etc..?
It's something special because it can stand up to the heat for an extended period........in theory.

I've got a $1.00 piece of 3/8" fuel hose on the SD. Ought to last two years or so.
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  #29  
Old 06-20-2007, 09:43 PM
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Quote:
Originally Posted by justinperkins View Post
Found the problem, my wastegate hose is not cracked it just disconnected from the housing.

I haven't had a chance to replace it yet, since I just finally noticed it while filling up at the fuel station. Is this hose anything special or would they have something suitable at Autozone/Napa Auto/etc..?
Its silicone based material. You can find pure silicone hose in that small diameter (I saw it in Blue ) if you look at a aftermarket car parts place but its fairly pricey because its priced for dolling up ricers and similar.
You may need a compression clip on the end where it fits the nipple.
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  #30  
Old 06-20-2007, 11:49 PM
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Originally Posted by Brian Carlton View Post
It's something special because it can stand up to the heat for an extended period........in theory.

I've got a $1.00 piece of 3/8" fuel hose on the SD. Ought to last two years or so.
If that hose is supposed to be 3/8", then my wagon is 300HP

I bought a 3/8" section of hose from Autozone, the inner-diameter was about a 1/4" too big. Back to AZ or Napa Auto for the right hose. This time I'm going with my original hose in-hand.

Where mine broke seems common, because the wagon in my garage that I'm rebuilding is broke at the same spot. It wasn't broken until I tried to pry it off though.

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