I need to purchase a turbo for my 20b project and am having trouble deciding on a hot side. I am shooting for 600rwhp at ~15psi and near immediate response at 3500rpms -the lower the better.
I am more or less set on using a TEC Turbo HT-400 II compressor. The HT400 II generates about 85lbs a minute at 2.02 and has a very wide sweet spot. For a hot side they recommended a Q trim wheel with a 1.10 A/R. That seems small to me because I am using a 1.0A/R on my 2 rotor with a 35R compressor. However, the 35R has a P-trim wheel instead of a Q, so I’m not sure it is a good reference. 1. Aside from trial and error, how can I determine what the ideal specs are for a hot side (wheel and A/R)? 2. For those of you with a 20b single turbo please share your specs |
T88 34D. You'll get 600rwhp @ 1 bar of boost. Very responsive. With a little more tuning and some 1600's i'll be at 600rwhp pretty easily at 1 bar. Click on the link in my signature.
-Destin |
[quote name='sillbeer' date='May 25 2005, 07:58 AM']T88 34D. You'll get 600rwhp @ 1 bar of boost. Very responsive. With a little more tuning and some 1600's i'll be at 600rwhp pretty easily at 1 bar. Click on the link in my signature.
-Destin [snapback]717264[/snapback] [/quote] He's asking for hot side specs, so what size exhaust housing are you running on that T88? Stock motor T76 Qtrim, AR .96 will get you 15psi at ~3000 and 1.30 will get you 15psi at ~4500. Ported motor you should see boost a little earlier and be able to rev the motor a little higher, so depending on the porting the 1.15 could possibly be what you are looking for. |
[quote name='IGY' date='May 24 2005, 06:58 PM']He's asking for hot side specs, so what size exhaust housing are you running on that T88?
Stock motor T76 Qtrim, AR .96 will get you 15psi at ~3000 and 1.30 will get you 15psi at ~4500. Ported motor you should see boost a little earlier and be able to rev the motor a little higher, so depending on the porting the 1.15 could possibly be what you are looking for. [snapback]717311[/snapback] [/quote] Iggy is pretty spot on for a good all around size 1.15, what size footprint is on it makes a difference as well. |
Q trim .96 all good. 1.15 ok. Any bigger no good , seen bigger on T76 20b pp drag car, gets into sweet spot at about 8500rpm cars a joke because of it.
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[quote name='ccarlisi' date='May 24 2005, 09:40 AM']I need to purchase a turbo for my 20b project and am having trouble deciding on a hot side. I am shooting for 600rwhp at ~15psi and near immediate response at 3500rpms -the lower the better.
I am more or less set on using a TEC Turbo HT-400 II compressor. The HT400 II generates about 85lbs a minute at 2.02 and has a very wide sweet spot. For a hot side they recommended a Q trim wheel with a 1.10 A/R. That seems small to me because I am using a 1.0A/R on my 2 rotor with a 35R compressor. However, the 35R has a P-trim wheel instead of a Q, so I’m not sure it is a good reference. 1. Aside from trial and error, how can I determine what the ideal specs are for a hot side (wheel and A/R)? 2. For those of you with a 20b single turbo please share your specs [snapback]717099[/snapback] [/quote] Your 35r 1.0 on the 2 rotor is a T3 footprint. A 1.1 on a T4 footprint should be a good bit bigger |
Thanks to everybody for their input.
Sillbeer, that's a hell of a car. [quote name='IGY' date='May 24 2005, 04:58 PM']Stock motor T76 Qtrim, AR .96 will get you 15psi at ~3000 and 1.30 will get you 15psi at ~4500. Ported motor you should see boost a little earlier and be able to rev the motor a little higher, so depending on the porting the 1.15 could possibly be what you are looking for. [snapback]717311[/snapback] [/quote] The motor has a large streetport. Based on what you guys have said I am leaning toward a Q-trim 1.15, unless I can hit the top end numbers I'm looking for (600rwhp at less than 16psi) on the .95 -in which case I definitely want the .95. I have decided on a GT42 compressor (the large one). The hot side and center section are still up in the air. The GT42 and T76 have very similar maps, so I assume Igy's experience with the T76 is somwhat representative of how a plain bearing GT42 would perform. If Igy is correct about the .95 and 1.3 on a stock motor I assume a 1.15 will hit 15 at ~3750. Now, how much should I lower that number based on the following factors (seperately) +street port (I have no experience going from a stock port to street port with a single. It didn't seem to make a difference with the stock twins in sequential mode-but the amount of airflow required is of course much different). +ball bearing center section (I believe garrett claims it reduces spool up by 800rpms. I find that hard to believe). [quote name='Zero R' date='May 30 2005, 03:20 PM']Iggy is pretty spot on for a good all around size 1.15, what size footprint is on it makes a difference as well. [snapback]719126[/snapback] [/quote] Sean, Don't you have a street ported 20b with a GT42R? If so give me the hard numbers https://www.nopistons.com/forums/pub...1047683329.gif [quote name='93 R1' date='Jun 1 2005, 11:58 AM']Your 35r 1.0 on the 2 rotor is a T3 footprint. A 1.1 on a T4 footprint should be a good bit bigger [snapback]719829[/snapback] [/quote] Actually I have a T4 footprint. It's a 35R compressor, but the rest of the turbo is basically a T04S. |
ErnieT is selling a 2 rotor t88 34d kit for cheap
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I will be running a Garrett T76 with a 1.32 on a large streetport'd motor, but I also have a 1.15 just incase the 1.32 in to laggy.
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We curenly have a GT42R kit availible for the 20B 2g body this is a special made to order item 4 weeks $5200.
Chris.. [quote name='20b 3rd gen' date='Aug 7 2005, 02:14 PM']I will be running a Garrett T76 with a 1.32 on a large streetport'd motor, but I also have a 1.15 just incase the 1.32 in to laggy. [snapback]746025[/snapback] [/quote] |
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