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Boost Tee Lag Problems

wlspn

By wlspn,
in Engines & Forced Induction

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wlspn Proficient

wlspn

Posted
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Hi guys. I have just fitted a turbosmart boost tee (the new blue 1) to my 32 GTST. Lag in 1st gear is not too bad but in 2nd it takes about 5 seconds to hit full boost. This is probly getting close to 4500-5000 rpm. Is this normal on boost tee's? Other mods are 3" turboback, FMIC, BOV & pod filter. I have been running 10 psi with no probs & have now upped to app. 13-14 psi.

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https://www.sau.com.au/forums/topic/159912-boost-tee-lag-problems/
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wlspn Proficient

wlspn

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  • Author
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Come on. Does any1 have any ideas? My mate & his brother both have S13 silvia's with boost tee's. My mate experiences the same lag problem that I do in 2nd gear while his brothers car runs fine but has a tuned ECU. Does this suggest that an ECU remap would fix the problem?

HR31_RB20DET Proficient

HR31_RB20DET

Posted
Posted

Had the same problem with my old turbosmart one, worked great for about half a year and then started doing what you described, took for ever to get boost in second after shifting from first. Replaced the turbosmart one with a GFB boost controller, problem solved.

R33silverS2 Mentor

R33silverS2

Posted
Posted

Basically the turbosmart ones are no good. I bought one for over $100 bucks and when you changes gears the lag would be really bad. There was no boost and it was all have to build again. Was really really noticable as you would be hammering in first then shiftt to 2nd (quickly) and the car would feel real flat, and then slowly build. The turbosmart ones don't allow for air to escape between the actuator and the controller. Keeping the air in the line during gear shifts causes the wastegate to stay open hence you loose all you boost and have to build it up again - bad design. I bought a turbotech as a replacement but still found it laggy till i drilled a hole in it. (some come with the hole others don't dunno why). HAve a look at the turbotech thread + search for turbocmart bleed and you'll find the answers. :)

R33silverS2 Mentor

R33silverS2

Posted
Posted
Would drilling out the restrictor in the turbosmart valve help? What size do you go with the turbotech items?

I drilled a 1mm hole in my turbotech one, 1.5 prob would have worked fine as well. The turbosmart ones have a different setup to the turbotech which is ball and spring. With the turbotech you wind the top in for more boost and with the turbosmart you wind it out for more boost as i believe the turbosmart ones are a bleedvalve type of setup. Due to this i am not sure how you could successfully modify the turbosmart tee to make it work efficently. Prob better off just buying a turbotech, sucks i know, but at least the turbotech's are cheap.

cheers

R33silverS2 Mentor

R33silverS2

Posted
Posted
Would drilling out the restrictor in the turbosmart valve help? What size do you go with the turbotech items?

I drilled a 1mm hole in my turbotech one, 1.5 prob would have worked fine as well. The turbosmart ones have a different setup to the turbotech which is ball and spring. With the turbotech you wind the top in for more boost and with the turbosmart you wind it out for more boost as i believe the turbosmart ones are a bleedvalve type of setup. Due to this i am not sure how you could successfully modify the turbosmart tee to make it work efficently. Prob better off just buying a turbotech, sucks i know, but at least the turbotech's are cheap.

cheers

R33silverS2 Mentor

R33silverS2

Posted
Posted
sorry to hijack but my turbotech one doesnt come with a hole, should i drill a 1mm hole in the body of it like this picture has one

http://img162.echo.cx/my.php?image=00001549rz.jpg

Just drill it directly opposite the barb running to the wastegate. So yeh like the pic.

tek_01 Proficient

tek_01

Posted
Posted

i drilled a hole, what a difference. before it felt like there was something holding me back between gear changes (sort of like i changed from 3rd to 2nd and compression was slowing me down) and generally i had to accelerate more than would expect to keep up with traffic but now the car seems to roll easily after gear changes and boost is straight back up

YAY

so back to the topic, yes it can be a laggy boost tee

lol

bubba Grand Master

bubba

Posted
Posted

I had a turbotech ball valve one installed (no hole :P) was noticing some lag on changes. I have just installed a Greddy Profec B SpecII and it's a world of difference! being able to keep the wastegate shut till almost full boost makes a hell of a difference! :P

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