Any ideas why im not boosting?
Increase preload. You can do it hit-and-miss, or you can do it the correct way.
Correct way would be to run a new length of 4mm vacuum hose directly from the nipple on the WGA to the nipple on the J-pipe. For the time being, plug off the open ends of the two hoses which you pulled off from said two nipples with golf T's.
Do a WOT run with the boost hoses set up in this fashion. Tell us what peak boost level is indicated on the boost gauge with hoses set up in this manner. Depending on what boost level is indicated you will know how much to increase preload. If your initial reading is under 14 PSI spring pressure is just way too low and needs to be increased so improve turbo spool up.
Personally I like to set spring pressure at about 3-4 PSI under your peak boost level. So, for example if you will be running 23-24 PSI peak pressure, then you will want to set spring pressure up around 18-20 PSI.
If you need any help with the mechanics of setting preload just ask and someone will help you out.
Correct way would be to run a new length of 4mm vacuum hose directly from the nipple on the WGA to the nipple on the J-pipe. For the time being, plug off the open ends of the two hoses which you pulled off from said two nipples with golf T's.
Do a WOT run with the boost hoses set up in this fashion. Tell us what peak boost level is indicated on the boost gauge with hoses set up in this manner. Depending on what boost level is indicated you will know how much to increase preload. If your initial reading is under 14 PSI spring pressure is just way too low and needs to be increased so improve turbo spool up.
Personally I like to set spring pressure at about 3-4 PSI under your peak boost level. So, for example if you will be running 23-24 PSI peak pressure, then you will want to set spring pressure up around 18-20 PSI.
If you need any help with the mechanics of setting preload just ask and someone will help you out.
Increase preload. You can do it hit-and-miss, or you can do it the correct way.
Correct way would be to run a new length of 4mm vacuum hose directly from the nipple on the WGA to the nipple on the J-pipe. For the time being, plug off the open ends of the two hoses which you pulled off from said two nipples with golf T's.
Do a WOT run with the boost hoses set up in this fashion. Tell us what peak boost level is indicated on the boost gauge with hoses set up in this manner. Depending on what boost level is indicated you will know how much to increase preload. If your initial reading is under 14 PSI spring pressure is just way too low and needs to be increased so improve turbo spool up.
Personally I like to set spring pressure at about 3-4 PSI under your peak boost level. So, for example if you will be running 23-24 PSI peak pressure, then you will want to set spring pressure up around 18-20 PSI.
If you need any help with the mechanics of setting preload just ask and someone will help you out.
Correct way would be to run a new length of 4mm vacuum hose directly from the nipple on the WGA to the nipple on the J-pipe. For the time being, plug off the open ends of the two hoses which you pulled off from said two nipples with golf T's.
Do a WOT run with the boost hoses set up in this fashion. Tell us what peak boost level is indicated on the boost gauge with hoses set up in this manner. Depending on what boost level is indicated you will know how much to increase preload. If your initial reading is under 14 PSI spring pressure is just way too low and needs to be increased so improve turbo spool up.
Personally I like to set spring pressure at about 3-4 PSI under your peak boost level. So, for example if you will be running 23-24 PSI peak pressure, then you will want to set spring pressure up around 18-20 PSI.
If you need any help with the mechanics of setting preload just ask and someone will help you out.
Ok I will do that. I'm hitting peak boost of 27 psi at 4500. So with the method stated above I won't be hitting my current my 27. I will only hit the tension of the wastegate preload. Is that correct?
Increase preload. You can do it hit-and-miss, or you can do it the correct way.
Correct way would be to run a new length of 4mm vacuum hose directly from the nipple on the WGA to the nipple on the J-pipe. For the time being, plug off the open ends of the two hoses which you pulled off from said two nipples with golf T's.
Do a WOT run with the boost hoses set up in this fashion. Tell us what peak boost level is indicated on the boost gauge with hoses set up in this manner. Depending on what boost level is indicated you will know how much to increase preload. If your initial reading is under 14 PSI spring pressure is just way too low and needs to be increased so improve turbo spool up.
Personally I like to set spring pressure at about 3-4 PSI under your peak boost level. So, for example if you will be running 23-24 PSI peak pressure, then you will want to set spring pressure up around 18-20 PSI.
If you need any help with the mechanics of setting preload just ask and someone will help you out.
Correct way would be to run a new length of 4mm vacuum hose directly from the nipple on the WGA to the nipple on the J-pipe. For the time being, plug off the open ends of the two hoses which you pulled off from said two nipples with golf T's.
Do a WOT run with the boost hoses set up in this fashion. Tell us what peak boost level is indicated on the boost gauge with hoses set up in this manner. Depending on what boost level is indicated you will know how much to increase preload. If your initial reading is under 14 PSI spring pressure is just way too low and needs to be increased so improve turbo spool up.
Personally I like to set spring pressure at about 3-4 PSI under your peak boost level. So, for example if you will be running 23-24 PSI peak pressure, then you will want to set spring pressure up around 18-20 PSI.
If you need any help with the mechanics of setting preload just ask and someone will help you out.
Don't mean to hijack thread but I have a similar situation and don't want to create a new thread... so Sparky, my car hits full boost ( 27) at 4k, stock turbo, stock intercooler and mods in sig, my wastegate preload has never been touched, is my spool too slow?
BTW I am freshly tuned by Tom and the car feels great, pulls strong and smooth, I just wondered if maybe something could be wrong with my wastegate preload, I have no boost leaks.
Last edited by Evoardo IX; Jul 4, 2012 at 07:53 AM.
With a stock IX turbo, or a VIII(10.5?) turbo you should be hitting 20 PSI by about 3200-3400 RPM more or less. That is doable on about 14-16 PSI of spring pressure. So, is 27 PSI the desired peak boost taqrget level for each of you guys?
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If the actuator is up to the task, then I would say that preloaded to about 22 PSI you should be able to see 27# by 3600-3800 RPM. This is an educated guess. Keep in mind that here are a lot of variables involved. But I would say that anything later than 3700-3800 RPM is a too slow spoolup rate for 27# for a stock inconel wheel turbo on a basically stock setup.
Increase preload. You can do it hit-and-miss, or you can do it the correct way.
Correct way would be to run a new length of 4mm vacuum hose directly from the nipple on the WGA to the nipple on the J-pipe. For the time being, plug off the open ends of the two hoses which you pulled off from said two nipples with golf T's.
Do a WOT run with the boost hoses set up in this fashion. Tell us what peak boost level is indicated on the boost gauge with hoses set up in this manner. Depending on what boost level is indicated you will know how much to increase preload. If your initial reading is under 14 PSI spring pressure is just way too low and needs to be increased so improve turbo spool up.
Personally I like to set spring pressure at about 3-4 PSI under your peak boost level. So, for example if you will be running 23-24 PSI peak pressure, then you will want to set spring pressure up around 18-20 PSI.
If you need any help with the mechanics of setting preload just ask and someone will help you out.
Correct way would be to run a new length of 4mm vacuum hose directly from the nipple on the WGA to the nipple on the J-pipe. For the time being, plug off the open ends of the two hoses which you pulled off from said two nipples with golf T's.
Do a WOT run with the boost hoses set up in this fashion. Tell us what peak boost level is indicated on the boost gauge with hoses set up in this manner. Depending on what boost level is indicated you will know how much to increase preload. If your initial reading is under 14 PSI spring pressure is just way too low and needs to be increased so improve turbo spool up.
Personally I like to set spring pressure at about 3-4 PSI under your peak boost level. So, for example if you will be running 23-24 PSI peak pressure, then you will want to set spring pressure up around 18-20 PSI.
If you need any help with the mechanics of setting preload just ask and someone will help you out.
Eduardo, yours is a Latin American Market RS isn't it? I have a Latin American Market VIII RS which originally came with a JDM Ti wheel VIII RS turbo. If your IX came with a TiAl wheeled JDM turbo then I would say that you should be seeing 27 PSI by 3200-3400 RPM once spring pressure is optimized.
I am on vacation in Antigua, Guatemala today. The family is dragging me out the door to go visit a pagan religious shrine. So, I'll check back in about three hours. Sorry, duty calls. I am sure that you will understand.