4x4_Welder Posted February 28, 2009 Share Posted February 28, 2009 I've been thinking about this engine a bit, and I have to wonder how much of the power increase comes from the addition of boost, and how much is due to the heads being a much better design? If you were to run these heads on a 9.5:1+ engine, could you expect pretty close to the same power as the turbo engine? Link to comment Share on other sites More sharing options...
PoorManzImpreza Posted February 28, 2009 Share Posted February 28, 2009 short answer? no... I believe the highest n/a stock ea82 came on the late model xt and the non usdm 'L-series' GT models the gt had 9.7:1 compression and bigger cams, but had just barely 100 bhp stock, and was fwd that was still enough to peg the 220kph speedo on a nice LOOONG stretch of highway. The xt had the 'spider' intake and 9.5:1 compression and around 97bhp. HTH Kaz Link to comment Share on other sites More sharing options...
GeneralDisorder Posted February 28, 2009 Share Posted February 28, 2009 XT's came with what you are looking at - MPFI non-turbo with dual-port heads. They had 95 HP. GD Link to comment Share on other sites More sharing options...
4x4_Welder Posted February 28, 2009 Author Share Posted February 28, 2009 Ah, I now understand what a spider intake is- Still, what a 20hp difference between that engine and the turbo? Link to comment Share on other sites More sharing options...
Gloyale Posted March 1, 2009 Share Posted March 1, 2009 Ah, I now understand what a spider intake is- Still, what a 20hp difference between that engine and the turbo? yup. I am building a non-turbo, spider intake ea82 for my wheeler right now, we will see how it does. Link to comment Share on other sites More sharing options...
GeneralDisorder Posted March 1, 2009 Share Posted March 1, 2009 (edited) Ah, I now understand what a spider intake is- Still, what a 20hp difference between that engine and the turbo? Less actually - the spider intake added some. The first MPFI non-turbo's were 95....back in '85. By the later 80's they had them up to 100 HP with the spider intake and some other changes. It may not sound like much but there are several factors here: 1. The EA82T has a 7.7:1 comp. ratio. It's power level without the turbo is probably around 60 HP. 2. The turbo is small - designed to spool rapidly and mask the otherwise poor performance of the engine. It's also supposed to drive like an N/A - turbo spools quick for torque down low. 3. Small turbo means it makes less CFM and has to spin much, much faster to make large amounts of boost. Thus the factory boost level of around 6 pounds. 4. Rough numbers, every pound of forced induction above atmospheric is equivelent to about 10 HP. So if you put on a larger turbo, boost to 11 or 12 pounds, deal with fuel cut, and get the fuel it would need, proper exhaust, etc - you could make 150+ HP.... till you collapse ring lands, blow holes in the pistons, blow the head gaskets out, crack the heads, or any number of other failures common to overboosted EA82T's. GD Edited March 1, 2009 by GeneralDisorder Link to comment Share on other sites More sharing options...
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