On a 1g manual you should hit boost around 3k or before..

I would check for pre turbo exhaust leaks.Look at the manifold for cracks to..And while you at it do a boost leak test..

^^ I agree. Also some MBC's allow you to boost at lower rpms, I know the turbo-smart MBC says it improves response by up to 800 rpms. The 1g maf is restrictive so the 2g maf will help your air flow for sure. What are your plans for the car?

Exactly what he said. Probably a couple boost leaks to take care of.

My future plans at a fmic. evo 3 16g. 225 fuel pump. 650 cc injectors. manual boost controller. full 3inch turbo back exhaust. turbo gauge. ported head and exhausts. thats just for now.

Take the inlet off the turbo when the engines cold then grab the compressor shaft and spin it. If it's not turning freely or if when you turn it you feel a rough scratchy type feeling and it doesn't want to coast when you spin it quickly then you have coking built up on the CHRA bearings and you need a turbo....or at least a rebuild.You'll also want to look for damaged turbine and compressor blades which can negatively effect spool times. and then there's boost leaks.......
William-

You will need an afpr to control that 255 pump..

The evo 3 hits boost around 3200+

yes i was going to put a fuel pressure regulator in there aswell. so yeah my boost is way laggy. if all is fixed no boost leaks anymore will a bigger exhaust help boost lag or is that a myth?

if you fix whatever boost leaks you have you should be pretty happy with the results. 4200rpm on a 14b is quite a bit of leaking. How long have you owned the car and have you done all your preventive's?

Lag is caused by in your case most likely a pre turbo exhaust leak..


Bigger exhaust can leed to boost creep..And If your looking to go 16g you will get used to that..Or port the turbo to prevent it..

i took it to a performance shop for a complete diagnostic before i bought it. the shop was rated very high and the next day the clutch was slipping it stalled on me. alot of things happend just one day after i bough the car. im doing alot of work right now to try to even pass emissions. ive failed twice already

I had a turbo lag like that once when I went back to stock 14b. I found out it was my flapper that got stuck open. So check there even tho it may look closed it could be open a little to where it will cause boost lag.

You can always shim the wastegate if the flapper is kinda stuck open..Let me see if I can find that article..

Edit: No I canot find the article on shimming the wg..

Bud92gsx said:

Lag is caused by in your case most likely a pre turbo exhaust leak..


Bigger exhaust can leed to boost creep..And If your looking to go 16g you will get used to that..Or port the turbo to prevent it..

Click to expand...

Im about to switch to a 14b and 3" exhaust, will it creep if i set it around 14-15lbs with a full 3" exhaust and an e bay open dump o2 housing? Also my car used to take a minute to hit full boost, had a decent boost leak. Fixed it and there was a night and day difference.

Porting the turbo will cut down on creep.. Heres a little something to read.. http://www.dsmtuners.com/forums/art...boost-creep-modified-wga-peepers-mod-how.html

Bud92gsx said:

Porting the turbo will cut down on creep.. Heres a little something to read.. http://www.dsmtuners.com/forums/art...boost-creep-modified-wga-peepers-mod-how.html

Click to expand...

Thanks for the link, much appreciated.

Just like everyone else has already said it is most likely a manifold exhaust leak. If the energy is wasted before it can perform work on the turbine then it will take more input and a longer time for the exhaust to spool the turbo.

However, with most spring actuated wastegates there is a certain amount of boost creep. A spring actuated wastegate doesn't simply open when you hit your desired boost level, it opens progressively. Whereas an electronic boost controller only opens the waste gate when that level is reached!

I have to agree with the boost leak/exhaust leaks. My 14b spools to 19psi by 3500