MAFoElffen
New member
I'm a little frustrated. I put in a boost fooler in anticipation of an impending turbo upgrade. I set it to . So my electronic gauges now won't read boost above 25 pounds. (They go through the PCM.) My mechanical does, but it's a GlowShift and for some reason it's just not smooth when it works ( I hate that!!!).... That is sort of an sideline issue, not really what this frustration is about...
I have 2 turbo's. First was a spare TP-38 with a Riffraff 60mm billet wheel (ww2) type, EBPV delete high-flow exhaust outlet, EBPR delete pedestal. When I rebuilt it, I upgrade that to a 360* thrust bearing. I also put on a 1.0 A/R turbine housing. I switched out my stock TP-38 for this onto my truck and it was giving me a consistent 20psi on WOT accel, with a peak of 25.6 psi. It was spinning up at between 1400-1500 rpm. I was getting about 20 mpg.
After running that awhile, I was planning for support for a future injector upgrade to 238's. I talked to James about that when I was trying to decide on 238/100's or 238/200's. After talking with him about that, I occasionally tow, so I need to leave that in the mix. I decided on 238/100's and a long-range goal to go an S468. He thinks that will be ideal to clean those out. He thought a D66 would not be enough...
I knew I would need more air to support the 238's... I figured in the meantime, I would make one more upgrade step until I could afford a jump to a T4 and T4 kit... My original TP-38, I updated/ rebuild that one. I took the compressor housing/backing plate off that one and sent it to James as a core ... to get his ported Billet 66mm Kit...
James had been been doing this awhile with his billet 66mm and he's been getting boost numbers above 40psi.... with a 1.15 A/R housings. You guy's tested that kit and had been getting those numbers with that... I figured since I tow, that I try it with a 1.0 A/R housing.
Now for the frustration part of this. I think I went backwards somewhere. I put the newer parts on the turbo I had on my truck. Since I was getting god number with that combination housing/backing plate/wheel... I kept that together to put onto my spare. I figured I'd take those parts on the updated/rebuilt spare... to sell.to help pay for my injector upgrades. Like I said, my 66mm upgrade seemed to have backfired somewhere. (Now I'm keeping it in case I need to back off my upgrades!?!)
My first test, it peaked at 20.8, then... it wouldn't get above 14.7psi. My EBP numbers are higher. My EGT's are higher by about 150*F. I lost that snap I had at lower RPM's below 1800rpm and it doesn't pick up as fast. My mileage went down to 16mpg. I noticed the compressor pitch is different and for some reason. it's quieter that it was with the 60mm billet wheel combo. I did notice my pedal is higher (in relation to speed)... but...???
I thought, even though I didn't hear any, but maybe I had some cold side leaks. I had noticed that when the ported housing.backing plate got here, that it had been sand blasted and wasn't as tight a fit together... even with the new o-ring. I pulled it back off and resealed the comp housing with silicone. I really didn't want to do that, but the housing went together too flush with the original type o-ring which with stock housing, there is a slight bit before you tighten it down... and an over-sized o-ring was going to be too much. I didn't want to warp the housing with an extra thick o-ring. So . I replaced all my clamps with heavy duty cold side clamps. My numbers now are back up to 20 psi... but no more above that. It does seem to be a little better, but still something is not as expected.
Boy... I really didn't think I'd go backwards with that. I wrote Jame's about my concerns and problems. No answer from him yet. I just figure He must be busy. Maybe he'll jump in here.
I'm sort of thinking and thought maybe putting on a 1.15 A.R housing to see what it'll do... but I thought that maybe I would not have to do that after the 238's, not before. I'm almost ready to swap the other turbo back onto it.
I'm not here to bad mouth James, just the opposite. I've always had good luck with him, his parts. I still have the highest admiration for him and I want to keep the relationship we have going. I figure he's had good luck with that combination... So that maybe "I" have done something wrong or have overlooked something somewhere. I'm just at am at a loss where that might be.
I know some of you here can be over-critical just for the entertainment... but I'm here looking for constructive ideas that I may have overlooked.
I have 2 turbo's. First was a spare TP-38 with a Riffraff 60mm billet wheel (ww2) type, EBPV delete high-flow exhaust outlet, EBPR delete pedestal. When I rebuilt it, I upgrade that to a 360* thrust bearing. I also put on a 1.0 A/R turbine housing. I switched out my stock TP-38 for this onto my truck and it was giving me a consistent 20psi on WOT accel, with a peak of 25.6 psi. It was spinning up at between 1400-1500 rpm. I was getting about 20 mpg.
After running that awhile, I was planning for support for a future injector upgrade to 238's. I talked to James about that when I was trying to decide on 238/100's or 238/200's. After talking with him about that, I occasionally tow, so I need to leave that in the mix. I decided on 238/100's and a long-range goal to go an S468. He thinks that will be ideal to clean those out. He thought a D66 would not be enough...
I knew I would need more air to support the 238's... I figured in the meantime, I would make one more upgrade step until I could afford a jump to a T4 and T4 kit... My original TP-38, I updated/ rebuild that one. I took the compressor housing/backing plate off that one and sent it to James as a core ... to get his ported Billet 66mm Kit...
James had been been doing this awhile with his billet 66mm and he's been getting boost numbers above 40psi.... with a 1.15 A/R housings. You guy's tested that kit and had been getting those numbers with that... I figured since I tow, that I try it with a 1.0 A/R housing.
Now for the frustration part of this. I think I went backwards somewhere. I put the newer parts on the turbo I had on my truck. Since I was getting god number with that combination housing/backing plate/wheel... I kept that together to put onto my spare. I figured I'd take those parts on the updated/rebuilt spare... to sell.to help pay for my injector upgrades. Like I said, my 66mm upgrade seemed to have backfired somewhere. (Now I'm keeping it in case I need to back off my upgrades!?!)
My first test, it peaked at 20.8, then... it wouldn't get above 14.7psi. My EBP numbers are higher. My EGT's are higher by about 150*F. I lost that snap I had at lower RPM's below 1800rpm and it doesn't pick up as fast. My mileage went down to 16mpg. I noticed the compressor pitch is different and for some reason. it's quieter that it was with the 60mm billet wheel combo. I did notice my pedal is higher (in relation to speed)... but...???
I thought, even though I didn't hear any, but maybe I had some cold side leaks. I had noticed that when the ported housing.backing plate got here, that it had been sand blasted and wasn't as tight a fit together... even with the new o-ring. I pulled it back off and resealed the comp housing with silicone. I really didn't want to do that, but the housing went together too flush with the original type o-ring which with stock housing, there is a slight bit before you tighten it down... and an over-sized o-ring was going to be too much. I didn't want to warp the housing with an extra thick o-ring. So . I replaced all my clamps with heavy duty cold side clamps. My numbers now are back up to 20 psi... but no more above that. It does seem to be a little better, but still something is not as expected.
Boy... I really didn't think I'd go backwards with that. I wrote Jame's about my concerns and problems. No answer from him yet. I just figure He must be busy. Maybe he'll jump in here.
I'm sort of thinking and thought maybe putting on a 1.15 A.R housing to see what it'll do... but I thought that maybe I would not have to do that after the 238's, not before. I'm almost ready to swap the other turbo back onto it.
I'm not here to bad mouth James, just the opposite. I've always had good luck with him, his parts. I still have the highest admiration for him and I want to keep the relationship we have going. I figure he's had good luck with that combination... So that maybe "I" have done something wrong or have overlooked something somewhere. I'm just at am at a loss where that might be.
I know some of you here can be over-critical just for the entertainment... but I'm here looking for constructive ideas that I may have overlooked.
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