how to get turbo to spool later?

[98GSXtreme07]

...I drive mine fairly agressively and get almost 30mpg...

Is that highway or city?

 

[soldave]

no no aftermarket gauge. but im pretty sure that i can hear and feel when my boost comes on and thats what ive observed. #### gas mileage at this point id just like to not have my boost come on so early.
actually i dont really care it was just an idea that i figured if i didnt have to go spend 600$+ on big turbo that i was gonna try. and i have 1 boost leak that i know that i havent taken time to fix but how would that make my turbo spool earlier?

Not meaning to be rude, but a little bit of advice would be to use the shift button and capitalise the appropriate letters (start of sentences, proper nouns etc). Otherwise people will start getting on your back and you could get in trouble with the mods.

See rule 6 in the posting rules

 

[BoostFrenzy]

i dont think anyone understands its at half boost a 2000 rpms and full at 2200 and i don't like shifting that low and regardless of how depressed my foot is on the gas the turbo wants to spool. so i dont know.... just tryin to figure it out....maybe it'll be different after i get the 2.4 bottom end.and id rather not go the route of the gs with naturally aspirated or set my boost low id like to have the turbo there right when i need it.

I think you are going about this all wrong. The reason that boost comes on so early is because you have a T25 turbo. This turbo is a small little turbo that Mitsubishi used for exactly what it is doing for you now. When on the highway at 65-75MPH, say you need to make a lane change into a lane that is going faster then you, this turbo is ready to go as soon as you press on the gas a little harder. If when in the city you don't want it to go into boost, then you need to short shift it. Slowing spool will only give you WORSE gas mileage because you are making a low compression motor try and drive on a higher octane fuel. This means that your engine will be dumping in a set amount of fuel (plus or minus thanks to open loop fuel adjustment) and increasing timing to TRY and make enough power.

That, and getting a 2.4 liter bottom end will only make spool FASTER because of the increased displacement. If you want to save gas, run a stock boost level. If you are still getting bad gas mileage, start looking for problems with the car or do a weight reduction to your right foot

 

[->PrOjEcTGS<-]

Not meaning to be rude, but a little bit of advice would be to use the shift button and capitalise the appropriate letters (start of sentences, proper nouns etc). Otherwise people will start getting on your back and you could get in trouble with the pods.

See rule 6 in the posting rules

Before you go and critique anyone's post you better get your own spelling correct to begin with.

 

[Freerevving]

as much as id like my stock turbo to spool at 4500 instead of 2200 it dosent look like anyone knows how to make it happen.

yeah I do... clip it!
almost like having a bigger turbo, and you're sure to spool much later

 

[Twistaye]

You can always buy a N/A 4g63 1st gen if you want to have n/a power.. Otherwise you could use say an electronic boost controller with RPM control, maybe set your boost real low like ~5 psi up until 4500 where it will let you hit ~14-15 psi but that might be the only way besides going to a big turbo.. Also if you're planning on doing a 2.4 you're going to spool much sooner with the added displacement.. Just a few things to think about.

I don't see why you're complaining about gas mileage though? My GST gets above 26 mpg when I take it easy on it.. 26 mpg is pretty good considering the trade-off that it's a turbocharged I4 with a little bit of horsepower going through it.. I say check for boost leaks and whatnot and maybe get it tuned for better gas mileage.. Do a tuneup.. change to a better oil.. Search google there are many things you can do to make your car get good gas mileage. hope this helps.

 

[meliketoball]

Get 1.5 inch exhaust.

 

[No_Skillz]

Is that highway or city?

Combined, mostly suburban with long distances (3-4 mins) between lights and a handful of WOT pulls per tank.

Personal best is 36mpg, no WOT, no boost, never going over 2.5k rpm, babied all the way.

 

[DSM1G90]

Geez..17mpg .. I can easily do 24mpg around town since I simply watch my shift points (not going over 2500 rpms per each gear AND not hammering on the gas when the light goes green-just ease out the clutch and roll through the lights) by keeping the boost in the negative range - thus, making it act like a normally aspirated vehicle.

..and my fuel prices over in this part of the nation isn't the cheapest either. Right now, we're pumping $3.89/gal for 87octane which makes our 93 octane hitting at $4.09 ... Thus, I've easy on the pedal as much as I can.

And I've got a EVO-1 motor with a Big 16G for the turbo..

But, also do a serious tune-up along with it and following the basic 5*BTDC with connection shorted to ground.

 

[gstxtt]

wow. Thanks to the one person who actually answered me with a legit answer.

 

[soldave]

Before you go and critique anyone's post you, had better get your own spelling correct to begin with.

The spelling was fine, just the context in which it was taken in this instance was a mistake.

 

[Sp1kE]

cut open the wastegate, put in a very weak spring, reseal it?

then buy a quick acting electric valve, that will seperate a vaccum line going straight to the wastegate (loowww boost with that weak spring) and another route that goes through a manual boost controller. and set that to what ever you want.

Hook up a button in the car, when ever you want more than the little boost that weak spring gives you, hit the button and then it will go off the boost controller.


Something like this:
Electric air valve for Lego Mindstorms RCX

 

[Sp1kE]

or heres one that my buddy is using:
kgCM2 Electronic Boost Controller Type - R - (eBay.ca item 350090908464 end time 26-Aug-08 05:48:03 EDT)

 

[LandoAWD]

wow. Thanks to the one person who actually answered me with a legit answer.

Plenty of people offered good advice. Save the sarcasm, champ.

Don't push the gas pedal so hard. Disconnect your wastegate actuator. .

I can't believe it took 12 posts to get these simple points in!

FWIW, I get 22+ MPG...you have an issue with your car you need to correct, or you need to learn to drive less aggressively.

 

[_Madman_]

Geees, get the maintenance done!!! Your timing is probably off by a mile, your O2 sensors are smoking crack (both of them), IC pipes probably have 10 holes from .50 cal or something, and 3 of 4 cylinders are not getting any spark at all, they are just washing your exhaust with fuel.

I average about 16mpg (13l/100km), but with the driving style that eats pair of tires and brake pads in 3 months. You must be pushing your car really seriously, and I MEAN seriously, 4k-7k RPM range 70% of time, to get such bad mileage if it's in good condition.

By the way, low octane cheap fuel will only decrease the gas mileage, 91(95 EUR) is absolute minimum if you are pushing your car, I actually got better mileage with 93(98 EUR).

 

[soldave]

I agree with disconnecting the actuator if you're worried about gas mileage until you get the problems with your car sorted out. You'll lose a bunch of power but then you can be sure you won't go into boost accidentally.

 

[Sam@RRE]

Take off the Wastegate actuator. DONE 0-3psi boost.

 

[Defiant]

I am new to the whole turbo thing so I don't know that much.

We were done here, but I was away.

There's something drastically wrong if you're getting 17MPG. Track that down before continuing.