big garrett turbo

[dieseldummy]

Well, I just got my big garrett turbo installed. It is a T04B, with and intake A/R of .60 and exhaust A/R of 1.00. I finally got it in and took it out for a spin around the block. Oh man did it make a difference. I can hear an audible boost leak, so i need to tighten all the clamps again, but it still to my 0-60 time from 13 to 11. :eek: I am hoping that it will go even lower as soon as i get my leak fixed. Sorry for such a useless post, I just had to tell someone about it :D
Justin

[Beedee]

It's called stating a fact, not bragging :D :D :D
Go for it brother. ;)

[C.K. Piquup]

Let us know some boost #s when it`s tight.This is the stuff of the DP.Right-on Brotha!

[grape]

same sizing as a banks kit, if it has the t3 inlet on the turbine side. With my 250 horse pump and marine nozzles i'm going way down on the exhaust down to a .69 with the t04 family of exhaust housings and an external wastegate in the stock crossover. 62-1 inlet on the compressor side, enough air at 14 pounds for over 400 horsepower.

[patrick m.]

sounds just like my turbo, it REALLY makes more power. http://www.imagestation.com/picture/sraid80/p88a9be1e103e2b504674cf938291bf57/fb0b4664.jpg http://www.imagestation.com/picture/sraid80/p88a9be1e103e2b504674cf938291bf57/fb0b4664.jpg.thumb.jpg

[ 02-25-2004, 02:08 PM: Message edited by: Patrick m. ]

[dieseldummy]

Hi, I think I have all of my leak issues fixed, but can only obtain 8lbs of boost. What is wrong here? I was able to make more than that with the GM-3 turbo that I had.
Justin

[patrick m.]

my max boost is about 16psi, thats if i really lean on it.
i could easily get 15psi out of my GM4, but no more than 15, i think the wastegate was blowing open, even with the solenoid by-passed.

BUT- 8psi with the Garrett makes more power than 15psi with the GM4. I also found the GM4 didnt make any more power from 12psi to 15. (turbine housing too small).
you may have an exhaust leak somewhere pre-turbo.

[Jim P]

I had my wastegate solenoid bypassed too, allowing full vacuum to go to the wastegate actuator. I also could only get about 15 psi on my gm4. After I put on my home made wastegate controler(which is just a rod with a spring and a nut) I could get 25 psi. I do agree though that anything over 12 don't make any more power.

[dieseldummy]

I have checked and don't have any exhaust leaks pre-turbo. I have also noticed that my egt's are rising higher than they ever have. I'm assuming that this is because of the lower boost level. What else could be wrong?

[gmctd]

Turbine A/R is too great, at 1.00.
Hook a load up, and tow it for a bit - boost should increase as exh temp and flow increase, as you'll be staying in the lower gears longer with a load.
Higher exh flow, higher turbine rpm, greater boost.

Otherwise, you'll need to decrease the A/R to below .80 for over-all driveability, unloaded\loaded, or to around .60 - .70 to approach the response of the GM series turbos, depending on the weight and gearing of your truck.

[britannic]

That T04B you fitted sounds very similar to the Banks 6.2L, it works well with the right timing and fueling, but it's designed for higher gas flow above 2500rpm. This is one of the reasons I went to an MHI TE06H, which is wastegated.

Both turbo's choke points are above the max rev range for the 6.2/6.5L (the MHI is used by Banks on the 6.9/7.3 Ford engines).

A non-wastegated turbo is good for long distance towing/freeway cruising and a wastegated for quicker spool up.

[grape]

put an .81 housing on the exhaust side if you really don't won't a wastegate for some reason. If you want the boost to come up like crazy by 1500 rpm and then just let the boost set on the wastegate, get a .69 and weld an external gate on the crossover and attatch it to the downpipe somewhere downstream.

[dieseldummy]

I knew the pro's and con's of a non wastegated turbo before i started this i am mainly concerned with towing and keeping the egt's in check, I had a friend with a banks on a 6.2 and he could easily get 14-16lbs of boost out of his. I was kind of disappointed with my results, but could live with it if it weren't for the high egt's. To keep them in check i will have to turn my pump down, which theoreticly will decrease exhaust energy, therefore reducing boost a little. It almost sounds like a lose lose type of deal. What i think would be really cool is if a new variable vane garrett could be fitted on a 6.5. Then we would have the best of both worlds. Does anyone know of a place to get garrett turbo parts? Maybe if i could find an exhaust housing I can play around with A/R on the exhaust side to find the perfect size.
Thanks for all the input,
Justin

[britannic]

I found that timing is critical for turbo spool up, once the air intake and exhaust have been optimized. Timing too far advanced, results in slower spoolup and higher EGTs, too retarded, the turbo spools up a bit quicker, but EGTs rise too because of after burning fuel spilling out of the exhaust valves.

I regularly saw boost pressures in excess of 17psi on my 6.2L, which led me to the MHI to keep the levels in check.

[grape]

www.dallasturbo.com (http://www.dallasturbo.com) talk to dave, turbine housings are around 150-300 bucks new, depending on what you want. Dave might even be able to locate a used one for you to experiment with.

[Dieselboy]

Originally posted by grape:
www.dallasturbo.com (http://www.dallasturbo.com) talk to dave, turbine housings are around 150-300 bucks new, depending on what you want. Dave might even be able to locate a used one for you to experiment with. That's where I got my TE06H checked out. They're a good outfit, and do top notch work. I second grape's endorsement. :D

[britannic]

FYI: Some turbo compressor maps from Majestic Turbo (http://www.majesticturbo.com/compresson-maps.html) who are really helpful as well.

[dieseldummy]

According to this Turbo Calculator Turbo Calculator (http://www.turbofast.com.au/TFmatch.html) At 18lbs of boost, intercooled, 3800 max rpms, and engine capacity of 6400, it says 1.06 exhaust housing. I know 18lbs of boost is on the high side, but with an intercooler it can only help, until a headgasket goes. :D I was quoted $180 for an offcenter T4 exhaust housing with and A/R of .82. I think I will try messing with the timing when I get my transfer case fixed again. When I get some more funding I will try a smaller housing I think. Thanks for all the info.
Justin
On edit: Britanic, how do you make links like the one for your turbo that just says MHI TE06H Turbo? I'm not that computer advanced yet.

[ 02-26-2004, 09:42 PM: Message edited by: dieseldummy ]

[britannic]

dieseldummy: When you're creating your post, click the "URL" button below the edit window and a prompt will come up asking for the link (paste in one you just copied), followed by a prompt for the words.