950cc injcectors and 255hp

[fwdeclipse]

Ok I have been having a problem with my car which seems like happened when I installed the 950s and the 255. I have recently gone back to a 16g setup. The car just feels like it has no power. It idles like I have monster cams in it and if I try and hold the throttle at a certain rpm it will cut in and out. I am having extrememly slow spool times for this 16g 20psi by 4300rpm in 3rd gear. When I first put the turbo back on I was able to get 20psi in 1st and 24psi in 2nd. Now all of a sudden it only gets 15 in 1st and barely 20 in 2nd. I have fixed all boost leaks except for what is leaking into the crankcase. I have plugged the pvc and it still does it. I did a compression test and got 150-150-149-146. The car does not smoke at all.

I am wondering because I do not have a afpr this could cause this much grief. Before I went to a 60trim setup I had 650s and a 190lph and it would scream. It would rip the tires off. I upgraded to the 60trim did not like it so went back to the 16g but I left the bigger injectors in and pump thinking more fuel cant hurt. It does not even break the tires loose in 1st now. I am using a keydiver chip for tuning is it possible that 950s are to big for the keydiver chips. I know I am a stupid for not having an afpr but I have been low on funds and have not been able to buy one. I am probably gonna try that next and see if it helps. Any help is appreciated.

Just to add I just finished reading maglin post on the isc headgasket. He said he pegged his temp guage and then he would leak compression under boost even though he compression test came out good. My car overheated about a week ago and that seems to be when I was getting less boost. Just thought I would add that in there.

 

[Reese92tsi]

Looks like I don't see an afc in your profile. Jeffs chips are pretty close but you still need additional fuel control to get it right. Also those compression numbers are kinda low for a 2g so maybe you should do a leakdown test.

 

[LaN-]

Your running pig rich because you don't have a regulator. Put the 190 back in and you'll be fine.

Do you have a logger? if not get one NOW!!!!! LoL

 

[fwdeclipse]

Jeff has told me that I should not need to use an afc and that his chips are good enough.I guess I really need to save for dsmlink. I do have a logger but the batteries went dead and I lost my software cd when I moved. I do have a knocksum guage on the stock boost guage so that helps. I am gonna get my logger goin again soon. Do you guys think when I overheated it could have warped the head and that would be why I am seeing alot less boost now. I think that could be the reason for the hellatious idle. My water temp guage made it to almost 250*.

 

[fwdeclipse]

So does anyone know if my head could very well be warped and that is causing me to have lost so much boost. Even though the compression test was ok and it does not smoke a drop.

 

[thekellbeast]

Jeff has told me that I should not need to use an afc and that his chips are good enough.I guess I really need to save for dsmlink. I do have a logger but the batteries went dead and I lost my software cd when I moved. I do have a knocksum guage on the stock boost guage so that helps. I am gonna get my logger goin again soon. Do you guys think when I overheated it could have warped the head and that would be why I am seeing alot less boost now. I think that could be the reason for the hellatious idle. My water temp guage made it to almost 250*.

From the DSMChips FAQ

Q: Do I need an AFC or a piggy back system when I have installed the upgraded chip?

A: Generally, yes. Although the changes I make to the Global Fuel and MAS Compensation are very close to the stock and that makes it easier to tune. It is still recommended that you have some tune-ability, such as an Air Fuel Computer or a GOOD adjustable Fuel Pressure Regulator, so you may require more or less fuel depending on your car setup.

I don't have any firsthand knowledge, but I'm almost 100 percent certain that the DSMChips compensate for the injector size, but still aim for the stock air/fuel ratios. If you want to lean it out and make some power, you're gonna need some tuning.

Yeah, and that 255 is gonna be a problem, unless you start tuning for a higher fuel pressure.

 

[dsm-onster]

Nope, no way a 16g should be spooling that slow even on a "rudimentary" chip tune as long as one has the injectors for which it was tuned.

I don't think Jeff's tunes are "rudamentary" at all. But if they where, then he still should be getting full bost LONG before then. A tune doesn't do but so much for boost threshold. This still belongs in this forum .

If you have the injectors he tuned, it will still pull pretty hard and fell quite streetable, as if it were tuned from the factory for those injectors at the least. He probably dials in a little more timign and a little more lean mixture, because we all know these ecus are quite conservative.

BUT!!!!! you say:

Ok I have been having a problem with my car which seems like happened when I installed the 950s and the 255. I have recently gone back to a 16g setup. The car just feels like it has no power. It idles like I have monster cams in it and if I try and hold the throttle at a certain rpm it will cut in and out. I am having extrememly slow spool times for this 16g 20psi by 4300rpm in 3rd gear. When I first put the turbo back on I was able to get 20psi in 1st and 24psi in 2nd. Now all of a sudden it only gets 15 in 1st and barely 20 in 2nd. I have fixed all boost leaks except for what is leaking into the crankcase. I have plugged the pvc and it still does it. I did a compression test and got 150-150-149-146. The car does not smoke at all.

I am wondering because I do not have a afpr this could cause this much grief. Before I went to a 60trim setup I had 650s and a 190lph and it would scream. It would rip the tires off. I upgraded to the 60trim did not like it so went back to the 16g but I left the bigger injectors in and pump thinking more fuel cant hurt. It does not even break the tires loose in 1st now. I am using a keydiver chip for tuning is it possible that 950s are to big for the keydiver chips. I know I am a stupid for not having an afpr but I have been low on funds and have not been able to buy one. I am probably gonna try that next and see if it helps. Any help is appreciated.

You cannot put 950s in a car w/ a 650cc tune. You will run rich enough to kill spool performance and all other things that make a chip worth flashing. 950s are 46% larger than the tune you're set for. Thsi means lots o' unneccesary fuel. Killing spool and killing power.

 

[fwdeclipse]

Nope, no way a 16g should be spooling that slow even on a "rudimentary" chip tune as long as one has the injectors for which it was tuned.

I don't think Jeff's tunes are "rudamentary" at all. But if they where, then he still should be getting full bost LONG before then. A tune doesn't do but so much for boost threshold. This still belongs in this forum .

If you have the injectors he tuned, it will still pull pretty hard and fell quite streetable, as if it were tuned from the factory for those injectors at the least. He probably dials in a little more timign and a little more lean mixture, because we all know these ecus are quite conservative.

BUT!!!!! you say:


You cannot put 950s in a car w/ a 650cc tune. You will run rich enough to kill spool performance and all other things that make a chip worth flashing. 950s are 46% larger than the tune you're set for. Thsi means lots o' unneccesary fuel. Killing spool and killing power.

Well I got a new chip also when I changed to the 950s. I just went for a ride a minute ago and in first gear with the boost line off the actuator I only can boost 16psi. I have zero boost leaks except for the small amount that leaks into the crankcase. Two weeks earlier I was making almost 22psi in 1st gear. I am really starting to think my head is warped and boost is leaking. The only thing is the compression numbers come back ok and it does not smoke at all that I can see. I am so confused on whats up. I also tested and in 3rd it does not hit 24psi until about 4400rpm. I feel like I have my t4 60trim on again except alot less power. I am gonna try and put a afpr on it and see if it helps and if it does not then I guess I will pull the head and go from there.

Does anyone have any more suggestions. I dont really wanna buy an safc but I might try it to see if i can go leaner and help spool. My chip is burned for 11:1 afr but I dont know how well it works. Also it is burned for 18* timing advance. I will start the fund for dsmlink and a new head I guess.

 

[super95awd]

If you pegged the water temp gauge then the head could certainly be warped slightly. I've done that before. If so, get it resurfaced and rock out.

 

[dsm-onster]

Well I got a new chip also when I changed to the 950s. I just went for a ride a minute ago and in first gear with the boost line off the actuator I only can boost 16psi. I have zero boost leaks except for the small amount that leaks into the crankcase. Two weeks earlier I was making almost 22psi in 1st gear. I am really starting to think my head is warped and boost is leaking. The only thing is the compression numbers come back ok and it does not smoke at all that I can see. I am so confused on whats up. I also tested and in 3rd it does not hit 24psi until about 4400rpm. I feel like I have my t4 60trim on again except alot less power. I am gonna try and put a afpr on it and see if it helps and if it does not then I guess I will pull the head and go from there.

Does anyone have any more suggestions. I dont really wanna buy an safc but I might try it to see if i can go leaner and help spool. My chip is burned for 11:1 afr but I dont know how well it works. Also it is burned for 18* timing advance. I will start the fund for dsmlink and a new head I guess.

Have you checked for a preturbo exhaust leak?

How's your turbo shaft play? It can blow and not smoke. It's happened to me recently.

Both will kill spool time. Just trying to help you rule everythign out before pulling a head.

 

[fwdeclipse]

Have you checked for a preturbo exhaust leak?

How's your turbo shaft play? It can blow and not smoke. It's happened to me recently.

Both will kill spool time. Just trying to help you rule everythign out before pulling a head.

There is very minimal shaft play up and down. It is hard while the turbo is on the car to check for in and out but the other way seems pretty tight. I dont think I am leaking exhaust cause I cant really hear it,but I do have a half can of sea foam that I will try and check for that.

 

[dsm-onster]

There is very minimal shaft play up and down. It is hard while the turbo is on the car to check for in and out but the other way seems pretty tight. I dont think I am leaking exhaust cause I cant really hear it,but I do have a half can of sea foam that I will try and check for that.

You'll have to take the exhaust mani cover off to feel a leak on your hand. It will be hard to check under the exhaust mani or behind the turbo. It could be somethign as simple as a turbo to mani gasket. It could be a warped head too

 

[phreak965]

i saw 950cc and 16g turbo and i had to laugh/
seriously though you don't need that big of injectors for that small of forced induction, you might as well just poor gas cans into your cylinders

 

[2gGSX]

What's wrong with running bigger injectors than you need if you can control them?

 

[Street_Killer]

i saw 950cc and 16g turbo and i had to laugh/
seriously though you don't need that big of injectors for that small of forced induction, you might as well just poor gas cans into your cylinders

Thats the most ridiculous thing Ive heard in a while. If there controlled properly it doesn't matter how big they are. Besides it leaves plenty of room to upgrade, instead of buying bigger injectors later. Pretty much everyone will be laughing at you dude, sorry to break it to you.

 

[phreak965]

eh, if i was out of line by thinking it was funny...sorry, i just didn't think it would be nessecary to run that big of injector except for extremely high output. i'll keep my comments to myself from now on

 

[1gDSM4g63]

You definitely don't need 950cc and 255lph with what your car has. You need more mods besides fuel to get more power. I would go back to the 650cc and 190lph and get a fuel pressure regulator, wideband, and work on internals for now. You might want to go to the Tech section and read to get you back in sequence for upgrades.

As for the problem, there must be a vacuum leak something whether is a simply leak or a blown head gasket. I suggested you do a leak down test.

 

[Black_Bullet]

Thats the most ridiculous thing Ive heard in a while. If there controlled properly it doesn't matter how big they are. Besides it leaves plenty of room to upgrade, instead of buying bigger injectors later. Pretty much everyone will be laughing at you dude, sorry to break it to you.

Exactly... I run 850cc inj with a walbro 255 w/ a tuned in 48 psi base fuel pressure with the ntfpr which makes my inj flow rate come out to more like 890cc, and my car runs fine with a similar chip set up. Log your fuel trims, and log your afrs under wot, make sure your not knocking and pulling timing way back to b.c. and then make sure its not something stupid like your clutch slipping or something. Do you have 1g compression ratio or 2g compression ratio, because the numbers you gave are a little low for 1g or 2g compression results... My 1g has 160,155,150,149 compression results on stock bottom end. You say you dont smoke, but does it burn oil slowly over a period of time?
Because mines does from blow by from old rings, i wont ever see any smoke unless its black smoke from a boost leak, but I burn about 1 qrt of oil every 700-800 miles....
Also make sure your mechanical timing is correct. Does your car have a catalytic converter? Just me trying to throw out some variables...

 

[dsm-onster]

I run 1000cc injectors on th smallest of the 16Gs (and unported ). I also run more intercooler than neccesary , along w/ water injection, and a stockish 1g maf.

I have room for an HX40 6-blade swap, though.

 

[dsm-onster]

Because mines does from blow by from old rings, i wont ever see any smoke unless its black smoke from a boost leak, but I burn about 1 qrt of oil every 700-800 miles....

Just helping you out. . .

Have you checked your PCV valve?

 

[turbo addict]

Well I got a new chip also when I changed to the 950s. I just went for a ride a minute ago and in first gear with the boost line off the actuator I only can boost 16psi. I have zero boost leaks except for the small amount that leaks into the crankcase. Two weeks earlier I was making almost 22psi in 1st gear. I am really starting to think my head is warped and boost is leaking. The only thing is the compression numbers come back ok and it does not smoke at all that I can see. I am so confused on whats up. I also tested and in 3rd it does not hit 24psi until about 4400rpm. I feel like I have my t4 60trim on again except alot less power. I am gonna try and put a afpr on it and see if it helps and if it does not then I guess I will pull the head and go from there.

Does anyone have any more suggestions. I dont really wanna buy an safc but I might try it to see if i can go leaner and help spool. My chip is burned for 11:1 afr but I dont know how well it works. Also it is burned for 18* timing advance. I will start the fund for dsmlink and a new head I guess.

put a wideband on (beg, borrow, etc) to see where you are at air/fuel wise. If you overrun your fuel pressure regulator with 950cc injectors you will be dumping in much more fuel than with your 650cc. And more than likely with the 255 fuel pump you are over running it.
And a aftermarket afpr is always nice to have. But check to see where you are first. (cheaper).