Hey guys: Just trying to get ideas on how to make my turbo spool faster. (For autocross purposes) I have read that porting the manifold and 02 housing helps. any other ideas?

 

From what I understand if you drop timing during spoolup then the energy that would have went to the engine will get expelled out the exhaust and thus through the tubine giving you faster spool.

 

What fuel are you running and what AFR's during spool?

 

e85
antilag. (fuel into hot side of turbo bascially to keep it spooled)
small nitrous shot into turbo(hot side)..(basically an antilag setup)

assuming scca rules, cant use nitrous.. antilag might not even be legal.. i know theres a clause in there for stuff like that.

u just need to get more fuel into the motor.. the more fuel the more exerting air from combustion. IE, useing e85, because when tuned properly, u should be using about 30% more fuel to run at proper afr/temps
playing with timing is another idea. dont remember exactly, but i think its less timing more fuel. might yield u a few hundred rpm.. but probably nothing noticable.


I had no real issues autocrossing with my 60trim t3/to4e.. i seemed to basically always be in boost, not max boost, but in powerband atleast..

 

afr between 10.5- 11 under boost. I get full boost around 3.5k and i think thats good but if i could get it to spool faster with fairly simple mods that would be great.

can only get 91 octane here in Kansas. not wanting to go e85.

 

You can lean it out to around 12.0:1 - 12.5:1 during spool on pump gas.

What psi are you hitting for your "full boost"? What turbo? Twin scroll or single? A log would be nice.

 

Could you elaborate on your antilag setup? How are you dumping fuel into the hotside of the turbo? Running severely retarded timing? Running an air pump? Or Throttle kicker?

 

didnt say i use antilag setup

but basic antilag setup on rally cars use a hydralic/vac/cam controlled unit to push through normal hardlines.

this one would be vac controlled, almost identical to what the WRC 02 lancer used, it was vac controlled.


surtain factory euro/jap evos came with an antilag setup if i remember right.. but its hell on turbos. heat inside the manifold/turbo is redonkulous.
heres a jap spec evo with OEM antilag setup.
its vacume controlled.. but being that its on an oem car, im sure its very limited on how much it can do.

the 02 wrc lancer had a cam driven setup.

wasnt ever offered on USDM evos.

 

Oh I already know about that, I just thought from your post that you were running antilag and was curious about how you were running it. In those pics, those hard lines are for the SAS system. Diverts air from the charge pipe into the manifold.

I kinda wish the USDM evos came with the SAS system, but just turned off. So it passes emissions all pretty and whatnot when its stock. Then just adjust the tables in the ecu to set it up. :|

 

+1 I run about the same 12.0-12.5 during spoolup then when I hit full spool Im getting 11.0-11.5. My experience is you slowly loose power more and more as you start to drop below 11.0.

 

hks 7460r!

 

Ok I am one of those 16g6 guys. max boost is at 10psi. Pump gas 91 oct. I did some routine maintanance on my car and found that my flaper some times sticks open just a bit and so i sprayed it with a little wd40. The forge wastegate actuator was really dirty and so i gave it a good cleaning and lube and it seems to respond better. I also ported and polished the exhaust maifold and put in new gaskets. I also did a boost leak test and found that my evo bov(plastic one) leaks a little So looking for a new one. The next thing i want to do is see how i can improve throttle response.

 

You would be better off lubing the flapper pivot rod with high temp with anti-sieze. WD-40 isn't really a lubricant, it dries up quickly, and whatever stays behind will burn up.

Pick up a metal IX diverter valve. Those are good for ~25 psi.