250/200s sooner than later.....
- Thread starter Lowdown89
- Start date
gt40 series uses a turbine wheel of 77mm/68mm With the 4088 its matched to a 64.7/88 comp wheel and in the 4094 matched to a 67.8/94 comp wheel
That compared to the 38r which is a Comp:65.86mm/88mm Turbine: 76.20mm 67.73mm
Based on those numbers and that the turbine wheel uses comp wheels that splits slightly smaller and larger than what the 38R is, this looks like the turbine wheel for the 38r.
Not sure if it can be done but taking a gt40 turbine wheel onto a 38R shaft and then machine the housing to allow it to fit?
That compared to the 38r which is a Comp:65.86mm/88mm Turbine: 76.20mm 67.73mm
Based on those numbers and that the turbine wheel uses comp wheels that splits slightly smaller and larger than what the 38R is, this looks like the turbine wheel for the 38r.
Not sure if it can be done but taking a gt40 turbine wheel onto a 38R shaft and then machine the housing to allow it to fit?
neverkickn
New member
What are the specs on a van turbine shaft assembly just for comparison.
I just confirmation that the factory turbine exducer is acutally less than 68mm. The issue with parts compatibility is that the 38r is a reverse rotation charge so you can't pull any parts from any of the other garrett t-4 style turbos.
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MadDiesel73
New member
Van turbo turbine
Vader's Fury
Active member
oke:Turbosuzuki
New member
Lots of great info in this thread. Thank you Jason and Bill for sharing. I was the guy that bought Jasons stage1 injectors. Bill hooked me up and tuned my truck and it rips now.
dietoremain
New member
This thread gets full of more n more info every day I love it.
Lowdown89
New member
That's what I'm saying! Ford could have made it a lot simpler for us
Lowdown89
New member
Got the call, that my transmission is ready and will be shipped out tomorrow! Super excited to get it in the truck!
Tim @ P.I.S.
Member
Bill, nice job on what you have shown here. I do have one question I would love to hear your side on. Why is the peak at 2650? What after all this time do you feel the reason for the limited RPMs is??? DO you forsee anyway to break this long standing barrier? I have seen first hand some of the hold ups on the injection side. What can you share with us on the tuning side??
Was that before or.after the fuel pump upgrade?
It was after while the TQ peak seems in normal range @2500 the HP peak was only 100rpms high in the 2600s. Just from what I have seen from other dyno runs I would have expected to see a 3000 rpm peak for HP +/-100 rpms.
Could it be from maxing out the turbo already and maybe bring fuel in a little slower would have broadened the HP curve and taken the peak up in the rpm band? I am guess at this. I could just be a tuning preference as well :shrug:
Here is the dyno graphs of the various run before and after the pump was added. It looks like you could change the fueling to bring it up slower but then have it in turn fall off a bit quicker as you only have so much PW and fuel in it.
Could it be from maxing out the turbo already and maybe bring fuel in a little slower would have broadened the HP curve and taken the peak up in the rpm band? I am guess at this. I could just be a tuning preference as well :shrug:
Here is the dyno graphs of the various run before and after the pump was added. It looks like you could change the fueling to bring it up slower but then have it in turn fall off a bit quicker as you only have so much PW and fuel in it.
Tim @ P.I.S.
Member
A 200% nozzle can move 238cc of fuel in 2.25ms of pulse width(3200psi ICP). 2.25 ms/pw is allowable by the IDM at 4800 RPM.
Thats what raises why curiousity. If fueling is there, what on the tuning side can help open up some RPM???
Thats what raises why curiousity. If fueling is there, what on the tuning side can help open up some RPM???
PowerstrokeJunkie
Active member
Maybe im missing something by replying while not reading the entire thread-- In this dyno graph above it shows over 550hp. You are making that Lowdown on your truck? Thought this sucker had pmrs?
Lowdown89
New member
I have forged rods, bill rebuilt my engine last year and we added them then
That is just the electronic limit set by the IDM as you can not have signal overlap. That does not mean you have than much crank angle window time to injector the fuel in. Electric vs mechanical limits.
