Major Lag Please Help???????

[Red Man]

Ok Need Help, I blew my t25, so i had to buy a new turbo, i bought the evo 3 16g. So i NO UPGRADES. I have have the money and will start buying more upgrades as soon a i get the car running right. I dont wanna but any upgrades on untill i know the car is running some what right. Yes i have a boost gauge. My car drives funny it doesnt have the power or the get up and go the t25, i feel like i lost almost 1/2 my power. in first gear i can only get about 4 or maybe 5 lbs of boost, 2nd gear is like 7 or 8 now in 4th and 5th i can get to 10 or 12 lbs but am really still not going anywhere. Please help i bought a turbo and my car is slow. Is it because its a bigger turbo that the car is slow, do i need to upgrade to be able to go fast, what have i done wrong. O and the first thing i thought was boost leak i have checked everything no leak. Please help, tell if i broke something or tell me if i need upgrades to make it work, thanks

 

[somdturbo]

When you checked everything for leaks, did you use a leak tester? If not, you need to. Make sure your exhaust manifold is not severly cracked, although u would probably notice this...
I didnt hear you mention a boost controller? you def need one. I'd say you have not even reached the powerband of this turbo yet so until then it is going to feel slow. For max potential of this turbo you will need fuel injectors and other BPU's.

 

[travislaw]

Ok Need Help, I blew my t25, so i had to buy a new turbo, i bought the evo 3 16g. So i NO UPGRADES. I have have the money and will start buying more upgrades as soon a i get the car running right. I dont wanna but any upgrades on untill i know the car is running some what right. Yes i have a boost gauge. My car drives funny it doesnt have the power or the get up and go the t25, i feel like i lost almost 1/2 my power. in first gear i can only get about 4 or maybe 5 lbs of boost, 2nd gear is like 7 or 8 now in 4th and 5th i can get to 10 or 12 lbs but am really still not going anywhere. Please help i bought a turbo and my car is slow. Is it because its a bigger turbo that the car is slow, do i need to upgrade to be able to go fast, what have i done wrong. O and the first thing i thought was boost leak i have checked everything no leak. Please help, tell if i broke something or tell me if i need upgrades to make it work, thanks

Next post, please check your spelling and grammer it makes it really hard to read and help out when it is like what you posted. To answer your question, yes your bigger turbo takes longer to spool up than the T-25 did. T-25 was for low range, the Evo 3 16-g is made for mid to upper range. Plus you don't have the mods to be running something that big. To get that big of a turbo's true potential, you need bigger injectors, bigger fuel pump, fuel pump rewire mod, something to control your bigger injectors, an MBC, depending on how your boost will be you will want a FMIC. Your bigger turbo is going to want more fuel going to the engine because it will be pushing more air. With no mods, use the stock boost settings for the turbo. You should see spool up around 3500 RPMS, but I could be wrong on that part.

 

[GSX26]

Yeah, everyone here is correct so far with the bigger turbo needing bigger injectors and such. But the thing that puzzles me is not building stock boost. Check boost leaks with a boost leak tester. Intercooler pipes are common, throttle body and tb elbow, and also by the injector seals and intake manifold. Another thing that would affect your spoolup is exhaust leaks. Did you use a new gasket with your turbo? Do you have all the bolts in the exhaust housing inlet/manifold connection and all tight? Do you have any broken manifold studs and is the gasket bad on the manifold? Also, check that you wastegate is working properly. I believe the stock actuator on a evo3 is 12 psi, but I could be wrong. If everything mentioned here checks out fine, then someone else chime in because that's all I could think of. Boost leaks and preturbo exhaust leaks. Good Luck, the evo3 is a great turbo!

 

[Red Man]

thanks for the help guys keep it coming, but is it normal to have only 4 to 5 lbs of boost in first gear.

 

[MrBoxx]

When my T25 died on me I replaced it with a 14b, but didn't have an aftermarket boost controller. I was using the stock BCS. With the T25, it boosted to about 12psi. With the 14b on, it only boosted to 8psi. I believe that the BCS compensates for the increase in flow, but I may be wrong.

Your next mods should include a logger, fuel pump, and boost controller.

 

[daren_p]

Like everyone has said make sure you do a proper boost leak test & not just assume there are no leaks because all the clamps, etc. seem tight. A boost leak will not only hurt your spool time but will make the car run much richer then it normally would, giving you less power. The evoIII will spool slower then the t25 and since your still all stock you will get the worst possible spool. You need to free up the intake and exhaust and you will spool much faster. As for only building 5 psi in first, that is probably about right since your still all stock & first i such a short gear with not enough load to build all that much boost. As someone inticated above you should see the evoIII spool much sooner then 3500 rpms, this turbo is usually fully spooled in the low 3000's (I see 18 psi by ~3300). Now I guess you don't have a boost controller? I would consider this for one of your next mods. The turbo won't feel like it has any power because you aren't building enough boost to get into its effiency range. How did you hook up the waste gate actuator? Did you do it the same way as the t25? If so you probably want to change this & remove the bcs. You need to connect to a boost source from your jpipe or lower ic pipe (get a barbed fitting welded in if you dont have one) & take this line directly to your wastegate. Then cap of the bcs pressure ports & the nipple on the intake. Connecting it this will will give you the pressure of the wg actuator, which is probably around 10 psi. If you want a couple extra psi you can always shim the wg actuator (add a couple washers under the mounts on the comp housing), this will increase the base wg pressure. When you do get things figured out keep the boost at 14 & you don't want to go any higher the 15 psi or you will be taking a risk of damageing your motor because of lack of fuel.

 

[FORMONTOYA]

make sure you do a proper boost leak test & not just assume there are no leaks because all the clamps, etc. seem tight.

This should be included in all boost leak test posts. When I swapped my turbo out I tightened all the clamps tight, I mean really tight, or so I thought. When I had everything together and actually tested it, it was leaking from all but 2 clamps.

No matter what you think, test it, you'll probably find several leaks. And if it has been a while, or never, the throttle body is probably one big leak.

 

[travislaw]

This should be included in all boost leak test posts. When I swapped my turbo out I tightened all the clamps tight, I mean really tight, or so I thought. When I had everything together and actually tested it, it was leaking from all but 2 clamps.

No matter what you think, test it, you'll probably find several leaks. And if it has been a while, or never, the throttle body is probably one big leak.

I agree. I boost leak tested a couple weeks ago and found out my BISS screw on the throttle body was leaking. So I replaced it and then boost leaked tested again, and I was leaking at the throttle shaft (there are two O-rings there.) So now I am waiting for the O-rings to come in so I can pull the throttle apart and replace those O-rings.

 

[Red Man]

OK IF i have know i dont have any leaks , what the very next mod i need to get my car on the right track,
thanks for all the help

 

[travislaw]

OK IF i have know i dont have any leaks , what the very next mod i need to get my car on the right track,
thanks for all the help

A 195 LPH fuel pump or a 255 LPH Fuel Pump and an AFPR, the 195 doesn't need the AFPR. You could go with a MBC, but you wouldn't be able to turn the turbo up until you were flowing more fuel. Also do the fuel pump rewire mod, it costs $13 on E-bay for the parts if you don't want to go buy them yourself.

 

[MrBoxx]

Funny you mention that. I went to Radio Shack today to buy the rewire supplies and the total came to just about $13, not including 10gauge wire. I'm getting that for free from a friend who's helping me. So, either ebay or the Shack.

 

[daren_p]

Before he thinks about fuel there are alot of other areas he should upgrade first, if he keeps the boost low, where it should be without all the proper supporting mods. First off rewire the fuel pump because this is a cheep mod & allows you to get the most flow out of the stock fuel pump (plus when the time comes to upgrade your fuel pump it should be rewired anyways). One of the first mods you should get is a new blow off valve as the stocker leaks around 12 or 13 psi. Most people get a new hard upper intercooler pipe at the same time with the required flange for the bov that they choose. After that look to upgrade the intake and then exhaust. Make sure you keep the boost at 14 psi or under while still running the stock fuel system. Before you go playing with the boost too much you should get a logger setup so you know exactly whats going on. There is a good tech guide on this website which will lead you in the right direction as far as mods go.

 

[Red Man]

when do i need the safc thanks for all your help

 

[97_eclipse_gst]

When i bought my car it had a walboro 255 lph high pressure fuel pump in it, how can i tell if its rewired, also what does it do differently if it is. And if its not rewired is there much involved and where can it be find out how to do it?

 

[MrBoxx]

Take out the back seat. Remember, the little black clips are attached to the car, not the seat, so don't try to pull up on them or they may break. Pull off the metal plate on the passenger side under the seat. This is where the fuel pump is located. If there is a relay hooked up to the white plug and there is lots of 10 gauge wire used, it's been rewired. It would look more or less like this:

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And the vfaq to do the rewire is located here.

Does your car have an AFPR for that 255? If not, you're overrunning your injectors.

 

[chanley talon]

It could be very possible your blow off vavle is leaking while under accleration. I had this happen at the track . Dropped a full second. So i took it of and crushed it and put it back on . Since you have a second gen it really needs replaced.

 

[Talesin]

Also, check your turbo bolts. When I had my B16G put on, the mechanic 'lost' my original bolts, and tossed on a set he had laying around.. that weren't heat or strength rated for the kinda crap our turbos put them through. They kept backing out, I kept losing boost, and roasting bits of my engine with unchecked exhaust. Bought a set from RRE, replaced three (the fourth welded itself in place, so no big loss), and they haven't been a problem since.

 

[daren_p]

when do i need the safc thanks for all your help

You need an safc when you do fuel mods such as injectors.

 

[Red Man]

thanks for all the help, do i need a safc for a 255 fuel pump.

 

[MrBoxx]

Not really, but you DO need an aftermarket fuel pressure regulator (aka AFPR) so you don't overrun your fuel injectors.

 

[Red Man]

ok thanks