In Reply to: Re: how much boost can the stock turbo put out?, Kevin K [Profile/Gallery] , Wed, 4 Oct 2000 00:15:07

Try to find a map for the stock turbo. One place to look is at TurboFast in Australia. Their software has compressor maps imbedded although it doesn't even come close to handling intercooler design and rating acceptably.

Look at your pressure ratio. That is (boost + 14.7)/14.7. This assumes that you are at sea level. Figure out your mass flow in lbmass/minute. If you don't know how to calculate it, and it is pretty involved, another way to get this is to do a chassis Dyno run and correct the readings to the flywheel. For almost all spark ignition engines, 1 lbmass of air burned generates 10.1 Hp (+/- 0.3). That's a thermodynamic given. I've checked this on several engines and Rick Byrnes (Bonneville Sedan Land speed record holder, http://www.RBMotorsorts.com) was kind enough to give me some data from his engine development program which generated in excess of 700 HP from 2.8 liters @ 35 psi boost.

After you have mass flow and pressure ratio, you can check compressor efficiency against the map. At this point you can calculate REAL WORLD compressor discharge temp and make an intelligent decision on whether or not you need a larger turbo. I suspect that you need a much larger intercooler more than you need a larger turbo.

Put thermocouples or thermisters in both the compressor discharge and the throttle body. Throttle body air temperatures in excess of 125 degrees F are NOT acceptable. SEVERE engine damage from detonation can easily occur at this temperature under 20+ psi boost. You can lower this temp by using larger intercoolers or more efficient compressor trims if required.

Don Haulsee

PS to KevinK,
I can't make it to Summit Point. I'll be at VIR on October 13 for the vintage races.

• how much boost can the stock turbo put out?, Jordan, Tue, 3 Oct 2000 23:02:34
  • Re: how much boost can the stock turbo put out?, Seth Strait, Wed, 11 Oct 2000 21:23:29
  • Anyone noticed the elimination of lag on 9000's..., cutic, Wed, 4 Oct 2000 20:30:48
    • 2.3L helps n/m, Kevin K , Wed, 4 Oct 2000 20:41:59
  • Max PSI isn't as important as tuned PSI----->>>, Physh, Wed, 4 Oct 2000 20:05:05
    • okay so how do I get more HP out of my engine?, moby, Wed, 4 Oct 2000 20:12:27
      • Re: okay so how do I get more HP out of my engine?, Physh, Thu, 5 Oct 2000 02:07:59
  • You guys don't seem to understand..., Bond, Wed, 4 Oct 2000 14:57:59
    • Re: You guys don't seem to understand..., GM, Wed, 4 Oct 2000 19:00:41
      • because your t3/t4 was more efficient, JohnB, Thu, 5 Oct 2000 08:08:52
        • ecactly, that's what I thought :o) N/M, GM, Thu, 5 Oct 2000 18:12:35
    • Instead of shooting from the hip ...., Kevin K , Wed, 4 Oct 2000 16:02:54
  • (Super Long), Jeff Cunningham\, Wed, 4 Oct 2000 10:20:20
    • no, you are wrong..., Bond, Wed, 4 Oct 2000 15:02:13
      • you are also wrong ....., Kevin K , Wed, 4 Oct 2000 16:52:04
      • It's all a system of upgrades! Need more air!, Jeff Cunningham, Wed, 4 Oct 2000 15:38:21
    • larger turbo vs. ball bearing, dave n, Wed, 4 Oct 2000 14:24:07
  • Re: how much boost can the stock turbo put out?, GM, Wed, 4 Oct 2000 00:32:04
    • but , if I upgrade the turbo to on e that has a higher output...., Jordan, Wed, 4 Oct 2000 01:07:53
      • Re: but , if I upgrade the turbo to on e that has a higher output...., GM, Wed, 4 Oct 2000 10:49:03
  • Re: how much boost can the stock turbo put out?, Kevin K , Wed, 4 Oct 2000 00:15:07
    • You need to get a compressor map!, Don Haulsee, Wed, 4 Oct 2000 07:51:54 <-- Viewing This Message
      • no, already have 'em (link), Kevin K , Wed, 4 Oct 2000 11:11:48
        • I thought that OEM T3 was a 45 trim?, steveC in BC, Wed, 4 Oct 2000 13:25:44
          • Re: I thought that OEM T3 was a 45 trim?, Kevin K , Wed, 4 Oct 2000 15:48:57
            • looks like 45 compressor trim//.48 A/R turbine trim, steveC in BC, Thu, 5 Oct 2000 03:22:23
            • Re: I thought that OEM T3 was a 45 trim?, luke, Wed, 4 Oct 2000 16:01:00
              • measure the housing bores ...., Kevin K , Thu, 5 Oct 2000 09:38:06
  • You're Crazy, Kodiak, Tue, 3 Oct 2000 23:08:28
    • very funny D. but seriouslly..., Jordan, Tue, 3 Oct 2000 23:47:12

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