hey,
i have a h22 tuned w/ emanage. i know its not the best, but i have to use a piggy back. anyhow, at half throttle, the car runs great it pulls and build boost great. but the sec you go full throttle, and wastegate opens, it loses power and stops pulling. it build boost up to 11lbs, but it doesn't pull as hard as say 8-9lbs at half throttle.

 

And you're running OEM map sensor?

 

what turbo kit r u running and how is ur dump tube routed? it the wastegate is opeing right by the inlet of the turbo then thats ur problem

 

i have oem map, but using greddy boost sensor to tune. map sensor voltage clamp is set.

i am running a drag mani w/ tial 38mm open dump.

 

-open your head
-bust out camera
-take picture of your setup making sure to post the wastegate dump

 

sorry, got misfire codes now in all cylinders. trying to fix that... got new wires, ignition coil, gapped plugs to .26... i guess dizzy next. can valve lash cause misfires?

 

Sounds like a MAP sensor or tuning problem if its always cutting at ~11. If you lower the boost to say 9psi, do you have the same issue at full throttle?

-platinum

 

actually, i just swapped wastegates to a 11lb. it didn't do it on the old wg at 7lbs but never really opened cuz on the dyno, it was breaking up after 5k (but no cels) so i guess its a hard comparison. after swapping out the ignition coil, it ran alot better so i went ahead and swapped out the wg. now im getting misfire cels in all cylinders. still runs good under part throttle tho. the ignition timing pulls 3degrees during part load and 5 degrees after. is 5 too much? fuel was pretty steady 12ish:1. its tuned off the greddy pressure sensor and the stock map has a clamp on it. i get no map cel.

 

5 deg at 11psi is a bit aggressive for a piggyback. Try 1deg per 1lb of boost which is conservative but safe for your setup.

fuel looks good... whats your base timing, 16?

-platinum

 

base is at 15. so pull more timing? i'll give it a shot and see what happens.

 

any update..

 

pulled more timing. cels are gone. well for 3 days so far. still losing pwr at wot tho. its like as soon as you hear the wg open. the end of the dump is about 1/2" from a bracket and it points right towards it. could that be my prob? should i like slant cut it?

 

bah. misfire again. gonna try a dizzy.

 

anyone else? so far, no more misfire, but still slowing when wg opens. i can ride just under the wastegate psi and it runs great, but as soon a i give just a little more and the wg opens then it slows. doesnt have to be wot. i have a tial 38mm on a drag mani at 11lbs. the side port on the wg is hooked up about a foot down from the compressor and the top is open.

 

how do the plugs look that are coming out of the engine ? it should be relatively easy to spot the timing mark to see how much or how little you should be pulling or not pulling.

 

i put in a new oem cap and rotor and swapped out plugs earlier. i went with bkr7eix. the left is the new plug that i just pulled for pix. the right is the old one that i pulled out.

 

it has 10degrees pulled under boost.

 

Is that a bkr7e? the old plug i mean. looks like to much timing judging by the heat mark on the ground strap or if its noa 7 heat range then that was to hot of a plug. BTW you shouldnt need to run expensive iridium plugs. vpower coppers should do just fine with the proper heat range

id say thats your misfire is still to much timing try backing it down a little more to be safe. are you seeing any aluminum on the plugs? what exhaust are you running? is there a caonverter on the car? if so is it stock or aftermarket

 

yea, bkr7's. no cat. anti fowler. old dc sports ex. 2.5" dp.

 

the old plug looks like it was wrong. the new plug looks like it could use a degree or 2 more of timing (less pulled under boost)

also your washers are on the wrong way. the large part should be facing the cyl. the small part should be facing the sky.

 

Just curious, is your wastegate dump routed far behind the oil pan, or is it dumping directly into the engine bay??

It sounds to me like the WG is dumping 'dead' gas right near the turbo inlet. It will definately decrease power (think of it as anti-NO2), and can make a tuned mixture very rich, since it displaces oxygenated intake air.

1 more thing, I wouldn't be using those iridium/whatever plugs. Copper plugs do foul out easier, but they don't have that pesky problem of breaking tips off with the slightest detonation.

 

it dumps around the oil pan. it goes from the wg and goes down about a foot. the turbo has a filter pointed up thats located about 2 ft away from where the dump is. could that still be the prob?