202 turbo

[vn5000]

If you connect it back up and turn the boost up make sure when you test drive it that the engines cool 70 -85 deg and if you feel it leaning out back off fast.
Other than that i cant see any problems except it may run a bit rich at lower rpm at 5+ pound boost maybe try setting the meth triggering switch so it doesnt cut in till 7 or 8 pound.If this is a problem there is tables in the bin on your chip called flex tables that you can set so the ecm can turn things like this on and off at whatever rpm and boost you choose.You just need to add a wire to the ecm and a relay.

[delcowizzid]

never use meth injection to correct for fueling shortages it should only be used for cooling purposes when injecting via 1 nozzle into a plenum area due to uneven air distribution some cylinders will run leaner than others you should start with a small nozzle and keep increasing its size until you see no more cooling effect via the intake air temp sensor and then stop.im guessing you dont have an intercooler looking at the air temp readings in the logs they are getting pretty high

[seal12]

i have no cooler for lack of room so i have the next best thing, and yes its only there for intake temp cooling so if my temps are high then i guess it will work perfectly and give me a bit more longevity.

[seal12]

hi all, just a bit of an update on the hr after installing a wideband o2 sensor to get the mixtures spot on and increasing injector size to the bosch white 36lb and winding boost to 15psi it seems something is restricting my engine from letting rip for the power dosent increase as far as i can feel from around the 6 to 8 psi range and will just bog down and hit a brick wall.

could an exhaust manifold or actual exhaust size be the culprit?

or maybe the heads not breathing enough ? for it seems the turbo is making the boost and forcing it in but the engine is not able to consume and expel the spent charge? what could be holding it back?

thanks, cheyne

[delcowizzid]

what sort of timing and fuel ratio are you running at 15psi.its probably just the tiny little exhaust housing backing up pressure if the exhaust cant get out you cant get fresh air in on a v6 the small .63 housing on a t3t4 falls over at around 3000rpm buy a T70 off ebay will sort you out watch out 7-8 psi on the T70 will be more air in the cylinders compared to the t3t4

[seal12]

fuel ratio all throughout boost is around 12 and a maximum of 10 deg timing i think vn5000 said,

so you think it is the turbo being too small delcowizzid? it is a t3/4 with a .63 rear and it defiantly feels like some sort of restriction
and was unsure at first when i purchased it weather it would be big enough as i read alot about people using the t4 on 202 but figured they where only good for real big boost and high rpm.

all i really wanted out of this build was enough power to lose traction in second if i was to give it abit but even at 14psi it will not spin unless going uphill.

i remember before installing the custom exhaust manifold i notice if i looked through the runners that there was alot of weld dag left inside which reduced the overall size considerably but being new to forced induction i figured it would make little difference to a low boost setup, could this be a major factor?

[delcowizzid]

weld on the inside wont help flow but i doubt its your problem ide also be wary of any welding slag coming off inside the pipe it will damage the turbine wheel if it comes off when its doing 100000+rpm on boost LOL.it should fry the tyres well before 14psi 14psi should be nearly undrivable at half throttle or more

[Jayme]

gee, I dunno, be good to see the spark map, if its max of 10 deg, thats too low needs much more timing than that to getup and boogie. and your current turbo is great for spooling up quick and making 7-8psi but 14psi kinda is real big boost, to run up there with decent results you are going to need to get a bigger turbo.

[seal12]

yeah right could be the timing which i have been a bit worried about coz this engine is a standard black 202 and i think that the compression for these engines is 8.5.1 so i was wondering how it could handle so much boost without pinging and no cooler,

maybe i should be trying for less boost but more timing to achieve a lively engine?

[delcowizzid]

the turbo running at 14psi will be pumping out over 100*c air shes gonna ping for sure the more backed up the turbine and exhaust the worse it will want to ping .you need a laptop and some knock ears and that wideband and start logging without seeing what the ecu is doing your flying blind