Ek_Jak

Good to see there is more and more boosted S's in the PNW!!

killerbee_vr6

The lost power is in the dropped compression. You probably lost 10% of your potential power there.

cheddaboy

Yeah just read up on compression and knock and how they work together. I do still want to try a 3" cat back to see what happens. Very interesting though. Makes me feel like I should've just bought an Ap2 motor lol.

s2000Junky

150 IAT is very high. Definitely narrowing the window of detonation. 152F is the peak I saw when my aftercooler pump relay failed and was getting no fluid movement through the pump, I also heard the engine ping getting around town before I noticed what had happened. I would question if your aftercooler is even working? With a properly working large heat exchanger you should be about 125F max and 115F average.

s2000Junky

Generally a stock comp motor will yield more power IF your tuner is great at reading the small window between too much timing and not enough, both of which have catastrophic results. Not enough timing will cause high cylinder temps and melt down your exhaust valves and pistons in severe cases, and too much timing will cause detonation which destroys motors as well. Lowering the compression increases this window and margin of error. There is a point where less compression and more boost yields better power gains then higher compression and less boost, when you are pushing high boost levels such as 18-20+ psi generally. There probably is a cross roads you could map for ones particular application, but too many variables across the board, with fuel used, engine inefficiencies, IAT and EGT etc. Generally a supercharger has an increase tuning window because of how and where it makes boost on our engine, vs a turbo, so a lower comp motor usually makes more sense to get the most out of a turbo set up, and stock comp engine with a supercharger. I assure you though, that 1 point of lower compression is not your issue with being essentially down 100hp! 1 point of compression loss is roughly equivalent to 1psi boost. So for example a stock comp engine will make 400whp wile a 10:1 will make roughly 385whp.

Your IAT is a bit alarming to me, coupled with 1-2 other smaller things all of which combined may explain your current numbers. Thats my educated guess with the info you have provided so far. If there are deficiencies in how your set up is operating, the tune in order to be safe, will be extremely conservative to keep the motor from detonating. So a good tuner will do this based on how he is seeing the engine operating on the dyno. An even better tuner will be able to pinpoint the out of ordinary issues and fill you in on what to address. That accurate assessment is a bit more rare unfortunately I have found, which is why you are here, to figure out.

cheddaboy

Your IAT is a bit alarming to me, coupled with 1-2 other smaller things all of which combined may explain your current numbers. Thats my educated guess with the info you have provided so far. If there are deficiencies in how your set up is operating, the tune in order to be safe, will be extremely conservative to keep the motor from detonating. So a good tuner will do this based on how he is seeing the engine operating on the dyno. An even better tuner will be able to pinpoint the out of ordinary issues and fill you in on what to address.
[/quote]

Iat is definitely the pump that isn't connected or working properly(gotta play around with that).

The tuner also said that the fuel system is maxed out and suggested a bigger fuel pump. Now that you mentioned it could be on the conservative side, I think it is. What fuel pump should I be looking for(e85 compatible)?

camuman

X2. 100%.

MARK AUS S2K

Walbro 450 for e85


http://walbrofuelpumps.com/walbro-f9...-fuel-pump-e85

MARK AUS S2K

What water pump do you have for the aftercoler?

You need this beast of a pump which I just bought.


www.siliconeintakes.com
1 x Water to Air Intercooler Pump and Harness, Bosch Cobra (WAT001001) = $124.48
Mounting Hardware Included

s2000Junky

10%? I totally disagree. 10whp more like it. We are talking only 1 point off stock.

The bigger issue here is the high IAT and likely the sub par/conservative tune revolving around that high IAT to get the engine to operate without destroying itself.